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Study on the tunnel shape and soil-lining interaction influencing the lining behavior under seismic loading

Earthquake engineering and engineering Vibration 2024年第4期23卷 845-862页

作者： Van Vi Pham Ngoc Anh Do Piotr Osinski Ngoc Thai Do Daniel Dias Sustainable Development in Underground Engineering Research Team Hanoi University of Mining and GeologyHanoiVietnam Department of Underground and Mining Construction Faculty of Civil EngineeringHanoi University of Mining and GeologyHanoiVietnam Department of Geotechnical Engineering Institute of Civil EngineeringWarsaw University of Life Sciences-SGGWWarszawaPoland Laboratory 3SR Grenoble Alpes UniversityGrenoble 38400France

The response of tunnels subjected to seismic loading is a complex mechanism and depends not only on the seismic nature but also on tunnel structure and surrounding soil *** individual behavior of circular,rectangular,and sub-rectangular tunnels subjected to seismic loadings has already been studied in the *** the present research,two case scenarios of circular,rectangular tunnels and four sub-rectangular shaped tunnels,with similar cross-section areas,were adopted to perform a comprehensive numerical *** purpose of the study was to determine the mechanical behavior of tunnels of different shapes,depending upon seismic *** were performed by considering the influence of soil-lining interaction,soil parameters,and lining thickness,as well as lining *** were performed for no-slip and full-slip *** results indicate that the tunnel shape design is of great importance when regarding the mechanical behavior of the surrounding *** concerns no-slip as well as full-slip soil-lining interaction,especially when the lining is subjected to seismic ***,it is shown that changes in incremental bending moments for circular,rectangular and sub-rectangular tunnels that depend upon the soil-lining interaction conditions differ significantly.

关键词： tunnel shape soil-lining interaction seismic loading internal forces numerical analysis

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Evolution of the elastic properties of lacustrine organic shales under different thermal maturity conditions

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Science China Earth Sciences 2025年第3期68卷 781-802页

作者： Zhenjia CAI Luanxiao ZHAO Jiqiang MA Fengshou ZHANG Jianhua GENG State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China School of Ocean and Earth Science Tongji UniversityShanghai 200092China Department of Geotechnical Engineering College of Civil Engineering Tongji UniversityShanghai 200092China

Research on the elastic responses of organic-rich shales during thermal evolution has predominantly focused on North American marine shales. However, the rock physics properties of lacustrine(continental) organic-rich shales with varying maturities, particularly under the unique geological conditions in China, have not yet been comprehensively explored. Therefore,characterizing the elastic properties of lacustrine organic-rich shales across various maturity stages is crucial for understanding their seismic rock physics responses and for enabling the identification of sweet spots in continental shale reservoirs using logging and seismic data, as well as facilitating geophysical monitoring of the in-situ conversion of oil shales. In this study,hydrous pyrolysis experiments were conducted on immature shales from the Chang 7 member of the Yanchang Formation in the Ordos Basin and the Jijuntun Formation in the Fushun Basin. Compressional and shear wave velocities, along with elastic anisotropy, were measured at various stages of thermal maturity to observe the evolution of the elastic properties. For the Chang7 shale(compacted shale), both P-and S-wave velocities perpendicular to the bedding decreased significantly during the oil and gas generation stages, with the S-wave velocity perpendicular to the bedding decreasing by over 40%. Meanwhile, the elastic anisotropy increased significantly, likely because of microcracks formed by hydrocarbon expulsion from the bedding-parallel organic matter. In contrast, the Jijuntun Formation shale(cemented shale) exhibited an increase in both P-and S-wave velocities during the oil generation stage. This trend could be attributed to early-stage cementation, which suppressed microcrack formation, while the increase in the elastic modulus of the organic matter became dominant. However, during the gas generation stage, both velocities decreased, while the anisotropy increased owing to the growth of organic pores and microcracks, which out

关键词： Lacustrine shales Thermal pyrolysis Elastic wave velocity Anisotropy In-situ conversion

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Weight Analysis of Impact Factors of Interbedded Anti-Inclined Slopes Block-Flexure Toppling Based on Support Vector Regression

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Journal of Earth Science 2024年第2期35卷 568-582页

作者： Bocheng Zhang Huiming Tang Yibing Ning Kun Fang Ding Xia Department of Engineering Geology and Geotechnical Engineering Faculty of EngineeringChina University of GeosciencesWuhan430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China College of Geological Engineering and Geomatics Chang’an UniversityXi’an710054China

Block-flexure toppling failure is frequently encountered in interbedded anti-inclined rock(IAR)slopes,and seriously threatens the construction of hydropower *** this study,we first investigated the Lean Reservoir area’s geological setting and the Linda landslide’s ***,uniform design and random design were used to design 110 training datasets and 31 testing datasets,***,the toppling response was obtained by using the discrete element ***,support vector regression was used to obtain the influence weights of 21 impact *** results show that the influence weight of the slope angle and rock formation dip angle on the toppling deformation among tertiary impact factors is 25.96%and 17.28%,respectively,which are much greater than the other 19 impact factors within the research *** the primary impact factors,the influence weight is sorted from large to small as slope geometry parameters,joints parameters,and rock mechanics *** parameters,especially the geometric parameters,cannot be ignored when evaluating the stability of IAR *** numerical simulation,it was qualitatively determined that failure surfaces of slopes were controlled by cross joints and that the rocks in the slope toe play a role in preventing slope deformation.

关键词： interbedded anti-inclined slopes block-flexure toppling impact factors numerical simulation support vector regression engineering geology

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Viscoplastic solutions of time-dependent deformation for tunnels in swelling rock mass considering stress release

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Journal of Rock Mechanics and geotechnical engineering 2023年第8期15卷 2053-2071页

作者： Gengyun Liu Youliang Chen HyonChol Rim Rafig Azzam Department of Geotechnical Engineering Tongji UniversityShanghai200092China Department of Civil Engineering University of Shanghai for Science and TechnologyShanghai200092China Department of Engineering Geology and Hydrogeology RWTH Aachen UniversityLochnerstr.4-20 Haus AD-52064AachenGermany

Excavation and control of tunneling responses in swelling soft-rock tunnels of Sichuan-Tibet railway under seepage conditions were *** this,a fractional viscoplastic(FVP)model for swelling soft rocks was established by introducing Abel dashpot and unsteady viscosity coefficient,considering additional swelling deformation and damage of rock caused by humidity *** view of the FVP model,the viscoplastic deformation solutions for rock mass surrounding tunnel under seepage conditions were derived and long-term mechanical responses of swelling rocks upon tunnel excavation were ***,a stress release coefficient considering seepage and creep was proposed,based on which control responses considering stress release and failure mechanism of stress release measures were *** results showed that:(i)The one-dimensional(1D)FVP model has a good application for swelling rock and the three-dimensional(3D)FVP model could well describe the whole creep process of rock mass despite a much higher creep attenuation rate in the first stage of creep;and(ii)An appropriate stress release and deformation of surrounding rocks could effectively reduce the supporting ***,upon a large stress release,the radius of plastic region could increase significantly,and the strength of the surrounding rock mass decreases *** proposed solution could provide a theoretical framework for capturing the excavation and support responses for tunneling in swelling rock mass in consideration of time effect.

关键词： Sichuan-tibet railway Viscoplastic deformation Stress release Fractional model Tunneling engineering

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Intermediate Till Soil Properties and Distinctive Features 14th

Intermediate Till Soil Properties and Distinctive Features

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14th International scientific conference on Modern Building Materials, Structures and Techniques, MBMST 2023

作者： Lekstutytė, Ieva Moliakovaitė, Greta Žaržojus, Gintaras Gadeikis, Saulius Skuodis, Šarūnas Department Hydrogeology and Engineering Geology Vilnius University Vilnius Lithuania Department of Reinforced Concrete Structures and Geotechnical Engineering Faculty of Civil Engineering Vilnius Gediminas Technical University Vilnius Lithuania

ISBN: (纸本)9783031446023

All the sediments discharged from the Quaternary glaciers differ in their granulometric and mineral composition. Tills, sands, and clays cover unevenly sized areas in various places. However, during engineering geological and geotechnical investigations, the most found types of till soil are sandy low plasticity clay (saClL), sandy low plasticity clay-silt (saClL-SiL), and clayey sand (clSa). The last two mentioned are intermediate till soils which are mostly assigned as Medininkai glacial deposits. The analyzed intermediate glacial till deposits are distributed in the eastern part of Lithuania, where the biggest and the most complex buildings are being designed. During the research, about 80 moraine samples from the entire territory of Lithuania were investigated. Several samples were analysed using an SEM microscope. From all the obtained data a database was created, where all the data was summarized and analysed in P.K Robertson's graphs with SBT (Ic) zones. After research, intermediate till soil is characterized by low natural moisture content and high natural density, and it practically always has low plasticity, so the porosity rate of these soils is relatively low. This soil is less compressible. Investigated soil during this study mainly takes the position into P.K Robertson's graphs zones 4 (Silt mixtures) and 5 (Sand mixtures) mixtures where the Ic zone is 2.60. After research with an SEM, it can be stated that clay mineral mixtures (illite-smectite) and not clay minerals predominate in the investigated soils’ clay fraction. © The Author(s), under exclusive license to Springer Nature Switzerland AG. 2024.

关键词： Deposits

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Analysis of the Impact of Building Foundation Construction on the Structural Deformation of Undercrossing Subway Tunnels 9

Analysis of the Impact of Building Foundation Construction o...

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9th International Technical Conference on Frontiers of Hydraulic and Civil engineering Technology, HCET 2024

作者： Wen, Ji Song, Ke Yang, Kong Geology Engineering Environment Intelligent Monitoring Engineering Research Center of Jiangsu Province Jiangsu Nanjing China Department of Geotechnical Engineering Nanjing Hydraulic Research Institute Jiangsu Nanjing China

ISBN: (纸本)9781643685595

In order to study the influence of building foundation construction on the deformation of the underground subway tunnel structure, the deformation monitoring of the underground subway tunnel structure during the construction of the superstructure foundation was carried out based on a sports ground project in Nanjing. The deformation of the tunnel structure and its influence rule were studied by analyzing the monitoring data of the tunnel structure's vertical displacement, horizontal displacement and horizontal convergence. The results show that the external construction has a great influence on the tunnel structure. The maximum plane displacement of the shield section is 6.2mm, and the maximum floating of the track bed is 5.0mm. The horizontal convergence is normal. The main causes of tunnel structure deformation are earthwork excavation in open cut section and pile construction in shield section. By jumping bin excavation and accelerating the construction speed of pre-stressed beams, the deformation of roadbed in open excavation area can be controlled, and the floating trend of roadbed in shield area can be reduced by controlling construction load, drilling speed of shield drum and alternate construction of pre-stressed beams. The deformation of the tunnel can be accurately judged through construction monitoring, and the corresponding treatment measures can effectively reduce the influence of the construction of the upper building on the structure of the underground subway tunnel. © 2024 The Authors.

关键词： Piles

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Research on the dynamic behavior of transversely isotropic saturated media due to meeting subway loads using an improved 2.5D FE-BE method

Research on the dynamic behavior of transversely isotropic s...

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作者： Huang, Junyan Wei, Xinjiang Ding, Zhi Xu, Weiying Institute of Geotechnical Engineering College of Civil Engineering and Architecture Zhejiang University Hangzhou310058 China Department of Civil Engineering Hangzhou City University Hangzhou310015 China Jiangxi Bureau of Geology China

The focus of this contribution is to develop an improved 2.5-dimensional (2.5D) FE (finite element)-BE (boundary element) method for a tunnel structure-transversely isotropic saturated soil system subject to underground moving train loads. In the proposed model, the rectangular tunnel invert, the lining, and the region of interest within the soil continuum use the 2.5D FE method. The remaining region of half space is replaced with a viscous spring boundary along the lateral sides and boundary element along the bottom. The theory of acoustic propagation in saturated media is extended to include transversely isotropy, viscoelasticity and boundary elements. An existing case is calculated using the enhanced model, and the results are compared with the previous literature to validate the accuracy and reliability of the proposed method. A parametric analysis is further conducted, and the factors considered in the analysis of ground-borne vibrations induced by trains meeting in the rectangular tunnel include the soil permeability, the groundwater level, and the depth of the tunnel. Numerical comparisons show that the saturated soil above the tunnel moderates the displacement undulation caused by quasistatic axle loads of the train, but this is not the case if the load has a non-zero excitation frequency. Moving train loads with excitation produce larger excess pore water pressure amplitude than do the quasi-static loads over a wide range along the travelling direction. The effect of meeting trains depends on the running speeds of both lines in opposite directions to some extent. Other conclusions useful to practical engineers are contained in the parametric study. © 2025 Elsevier Ltd

关键词： Boundary element method

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Uncertainties of landslide susceptibility prediction: Influences of random errors in landslide conditioning factors and errors reduction by low pass filter method

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Journal of Rock Mechanics and geotechnical engineering 2024年第1期16卷 213-230页

作者： Faming Huang Zuokui Teng Chi Yao Shui-Hua Jiang Filippo Catani Wei Chen Jinsong Huang School of Infrastructure Engineering Nanchang UniversityNanchang330031China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China Department of Geosciences University of PadovaPadovaItaly College of Geology and Environment Xi’an University of Science and TechnologyXi’an710054China Discipline of Civil Surveying and Conditioning EngineeringPriority Research Centre for Geotechnical Science and EngineeringUniversity of NewcastleNewcastleNSWAustralia

In the existing landslide susceptibility prediction(LSP)models,the influences of random errors in landslide conditioning factors on LSP are not considered,instead the original conditioning factors are directly taken as the model inputs,which brings uncertainties to LSP *** study aims to reveal the influence rules of the different proportional random errors in conditioning factors on the LSP un-certainties,and further explore a method which can effectively reduce the random errors in conditioning *** original conditioning factors are firstly used to construct original factors-based LSP models,and then different random errors of 5%,10%,15% and 20%are added to these original factors for con-structing relevant errors-based LSP ***,low-pass filter-based LSP models are constructed by eliminating the random errors using low-pass filter ***,the Ruijin County of China with 370 landslides and 16 conditioning factors are used as study *** typical machine learning models,*** perceptron(MLP),support vector machine(SVM)and random forest(RF),are selected as LSP ***,the LSP uncertainties are discussed and results show that:(1)The low-pass filter can effectively reduce the random errors in conditioning factors to decrease the LSP uncertainties.(2)With the proportions of random errors increasing from 5%to 20%,the LSP uncertainty increases continuously.(3)The original factors-based models are feasible for LSP in the absence of more accurate conditioning factors.(4)The influence degrees of two uncertainty issues,machine learning models and different proportions of random errors,on the LSP modeling are large and basically the same.(5)The Shapley values effectively explain the internal mechanism of machine learning model predicting landslide *** conclusion,greater proportion of random errors in conditioning factors results in higher LSP uncertainty,and low-pass filter can effectively reduce these random e

关键词： Landslide susceptibility prediction Conditioning factor errors Low-pass filter method Machine learning models Interpretability analysis

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Numerical study of hydraulic fracturing in the sectorial well-factory considering well interference and stress shadowing

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Petroleum Science 2023年第6期20卷 3567-3581页

作者： Yu-Hao Liu Jin-Tao Zhang Jie Bai Feng-Shou Zhang Ji-Zhou Tang Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Southwest Oil&Gas Field Company PetroChinaChengdu610017SichuanChina Oil and Gas Technology Research Institute PetroChina Changqing Oilfield CompanyXi’an710021ShaanxiChina National Key Laboratory of Marine Geology Tongji UniversityShanghai200092China School of Ocean and Earth Science Tongji UniversityShanghai200092China

In the Changqing Oilfield in northwest China, when traditional petroleum exploitation encounters forestry reserves or water source protection areas, sectorial well-factory design is proposed. The most distinct feature of a sectorial well-factory is the deviation of the well from the minimum horizontal principal stress, resulting in hydraulic fracture deflection after the initiation, along with possible well interference (i.e., fracture hit) and fracture coalescence in the oblique wells. Four indexes describing well deflection are then proposed according to fracture morphology. Several fracturing designs, including stage arrangement, fracturing sequences, and fracturing techniques are applied to study the feasibility of the sectorial well-factory design. The results show that the “gradual” or “sparse” stage arrangement, large injection rate, and simultaneous multifracture treatment can help to optimize the fracture morphology and stimulation design. However, the subsequent stress shadowing effect usually adversely affects the fracturing of adjacent wells. With a small initial horizontal stress difference, large injection rate and staggered stage arrangement can achieve ideal stimulation performance. Our results can provide a guidance for optimizing stimulation design in unconventional well-factory while taking into account environmental protection.

关键词： Hydraulic fracturing Sectorial well-factory Fracture deflection Well interference Stress shadowing

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Assessment of rating parameters of the rock mass conditions at Udachny underground mine deep levels

Mining Science and Technology (Russian Federation)

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Mining Science and Technology (Russian Federation) 2024年第3期9卷 206-220页

作者： Serebryakov, Evgeny V. Zaytsev, Ilya A. Potaka, Andrey A. Laboratory of Engineering Geology and Geoecology Institute of Earth Crust SB RAS Irkutsk Russia Udachny Mining and Processing Complex PJSC AK ALROSA Mirny Russia Geotechnical Monitoring Department Udachny Mining and Processing Complex PJSC AK ALROSA Mirny Russia

geotechnical rating classification systems of rock masses are an important tool in the design of underground mining systems. They are especially relevant at the early stages of project development, when primary mining and geological information is available to a limited extent. The presented work shows an approach to the collection of initial information and calculation of RMR (Rock Mass Rating) and Q Index for the rock mass of deep levels of the Udachny underground mine exploiting the kimberlite pipe of the same name. Since the classifications are multi-component systems, they impose heavy demands on the scope and quality of primary data, which can be met by applying an integrated data collection system. The bulk of these were obtained by acoustic televiewer tool (ATV) combined with geologic and structural logging of non-oriented core. Data on physical and mechanical properties of rocks, stress-strain state, and hydrogeological conditions were also used. The ratings were calculated interval by interval along holes, in which acoustic logging was performed. The acoustic wave amplitude parameter, which depends on the physical properties of a rock mass and the degree of its structural disturbance, was proposed as one of the criteria for distinguishing geotechnical intervals. The moderate level of correspondence between Q and RMR systems was established to be due to the different "sensitivity" and structure of the input parameters. Using the calculated ratings, the rock masses of ore bodies and host sediments were evaluated for stability (classes/categories have been assigned), and the optimal method and parameters of workings support were determined. The geotechnical database accumulated during the research process provides the feasibility of calculating alternative ratings such as MRMR, RMi, GSI, etc., without the use of transient equations. © Serebryakov E. V., Zaytsev I. A., Potaka A A., 2024.

关键词： Manganese mines

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