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Geo-Risk Conference 2023

作者： Yeo, Lit Yen Kueh, Pei Gee Choo, Chung Siung Lee, Sue Han Zhang, Dongming Faculty of Engineering Computing and Science Swinburne Univ. of Technology Sarawak Malaysia Key Laboratory of Geotechnical and Underground Engineering of Minister of Education Dept. of Geotechnical Engineering Tongji Univ. Shanghai China

ISBN: (数字)9780784484982

ISBN: (纸本)9780784484982

In pipe jacking operations, the prediction of jacking forces has been the subject of several studies. Many established jacking force models are based on the strength properties of the negotiated soils or rocks during jacking. The application of these models is useful during the planning for pipe jacking construction. However, such models have limited use during the construction stage when decisions are made based on pipe jacking operation parameters, that is, jacking speed, lubricant, slurry pressure, etc. The influence of pipe jacking operation parameters on jacking forces is not well quantified. This gap could present adverse risks to construction progress, particularly in the highly weathered "soft rocks" encountered in the Tuang Formation underlying the central business district of Kuching, Malaysia. To assist in modelling pipe jacking operation, deep learning approaches have been widely deployed due to its powerful capability of feature learning. Therefore, an interesting question is raised: are we able to absorb the knowledge gained from neural networks to help reduce the decision-making gap in pipe jacking operations between the construction and planning phases? To this end, this paper proposes the use of gated recurrent units (GRUs) with an attention-based mechanism for providing insight into the decisions made on operation parameters during pipe jacking. A case study will be presented to demonstrate the visualization of attention utilized by the deep learning model towards the operation parameters. The findings showed that the input features (i.e., operation parameters) shifted throughout the drive. At the initial sections of the drive, more attention was directed towards operation parameters related to the micro-tunnel boring machine (mTBM) face. Subsequently, the attention was shifted to the cumulative operation parameters with progressive pipe jacking. The findings from this paper have the potential to help pipe jacking specialists identify and quantify

关键词： Decision making

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Overcoming barriers for decarbonisation of multi residential buildings with Energy service company (ESCO) model - Is the REPowerEU plan game changer for ESCO model? 7

Overcoming barriers for decarbonisation of multi residential...

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7th International Conference on Smart and Sustainable Technologies, SpliTech 2022

作者： Zanki, Vlasta University of Zagreb Faculty of Geotechnical Engineering Varazdin Croatia

ISBN: (纸本)9789532901160

Due to climate change, the EU Green deal and initiatives from Glasgow COP 26 require intensive mitigation measures toward decarbonisation of the buildings sector. One of the biggest challenges for achieving CO2 reduction goals will be the residential sector, especially multi residential buildings. Although there are well-known technologies and energy efficiency (EE) measures that can greatly contribute to decarbonisation of buildings, experience shows that the main barriers for implementation of EE measures originate from the potential client side and have social, economic and regulatory character. These barriers include: lack of awareness about climate change and necessity for urgent actions and long payback period for investment. On the other hand, market and ESCO company side barriers predominantly have economic and technical character, such as a lack of integrator who has professional capability to implement deep renovation projects as well as financial capability for investing in energy service through ESCO model with a long return of investment. Although there is different definition of ESCO model in the world and it is evolving and the model has been implemented for decades there is a little progress in implementation of such model in multi residential building sector. Additionally, there is a necessity for deep renovation of buildings where ESCO model is not desirable due to long payback period. However, there is a new reality now after two years of COVID pandemic and recent EU decision to dramatically decrease its dependency on fossil fuels through the REPowerEU plan. These have created new circumstances and drivers for intensive rethinking of implementation of ESCO model in multi residential buildings. This paper discusses barriers and drivers with associated risks for implementation of ESCO model in the residential sector and gives future direction of actions for implementation of this model in multi residential buildings. Barriers and drivers discussed i

关键词： Energy efficiency

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

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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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Analytical solution for longitudinal deformation of shield tunnel induced by overcrossing tunnelling considering circumferential joints

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Journal of Rock Mechanics and geotechnical engineering 2023年第9期15卷 2355-2374页

作者： Zhiwei Zhang Rongzhu Liang Zhongchao Li Cheng Kang MHEl Naggar Mingzhao Xiao Wenbing Wu Faculty of Engineering China University of GeosciencesWuhan430074China Wuhan Municipal Construction Group Co. Ltd.Wuhan340023China Geotechnical Research Centre Faculty of EngineeringThe University of Western OntarioLondonONN6A 5B9Canada

This paper presents a new analytical solution for assessing the longitudinal deformation of shield tunnel associated with overcrossing tunnelling in consideration of circumferential joints.A simplified longitudinal beam-spring model(SLBSM)is established to model the longitudinal behaviours of shield tunnel,which can consider the opening and dislocation between segmental rings ***,the existing tunnel is treated as the SLBSM resting on the elastic *** state equations including tunnel displacements and internal forces are constructed to solve the discontinuous deformation of circumferential joint-segmental *** feasibility of the proposed solution is verified through three well-documented *** predictions from the proposed method are also compared with other analytical *** is found that the proposed method can well capture the deformation of tunnel segmental rings and joints,where the rigid displacement mainly occurs in the segmental rings while the rotation and dislocation occur in the circumferential *** dominant parameters are also analysed to explore the effects on existing tunnel deformation,including the rotation stiffness and shearing stiffness of joints,the skew angle and the clearance between new and old tunnels.

关键词： Overcrossing tunnelling Shield tunnel Circumferential joints Longitudinal beam-spring model(LBSM) Opening Dislocation

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Electrical resistivity change of saturated sand during reliquefaction under hammering loading

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Earthquake engineering and engineering Vibration 2023年第3期22卷 613-622页

作者： Wang Binghui Xiao Xing Zhang Lei Wang Liyan Jin Dandan Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China School of Civil Engineering and Architecture Jiangsu University of Science and TechnologyZhenjiang 212000China Institute of Geotechnical Engineering Nanjing Tech UniversityNanjing 210000China Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013China

The electrical resistivity method was verified as an optional technique to monitor the change of mesostructure of saturated *** investigate the change laws of resistivity and analyze the reliquefaction meso-mechanism during the consecutive liquefaction process,five successive impact liquefaction tests were performed in a one-dimensional cubical *** resistivity variation and excess pore water pressure(EPWP)were *** results indicate that the excess pore water pressure experienced four stages:quick increase stage,slow dissipation stage,rapid dissipation stage,and stability ***,a swift decrease of resistivity emerged before the start of the rapid dissipation stage of EPWP,and then an increasing trend of resistivity is demonstrated with the densification of *** is proved that the vertical pore connectivity of liquefied sand is better than its random deposit state,based on a comparative study of porosity calculated from the settlement and resistivity of sand after each test.

关键词： sand reliquefaction resistivity excess pore water pressure mesostructure

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Experimental and numerical investigation on failure characteristics and mechanism of coal with different water contents

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International Journal of Coal Science & Technology 2023年第4期10卷 325-342页

作者： Xuewei Liu Haixiao Chen Bin Liu Sai Wang Quansheng Liu Yong Luo Jin Luo State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Faculty of Engineering China University of GeosciencesWuhan 430074China Ping’an Mining Engineering Technology Research Institute Co. Ltd.Huainan 232001China

Water injection, as a widely used technique to prevent coal burst, can restrain the fractured coal seam and released the energy storage. In this study, laboratory tests were frstly carried out on standard coal specimens with fve diferent water contents (i.e., 0%, 0.6%, 1.08%, 1.5%, 2.0%, and 2.3%). The failure mode, fragment size, and energy distribution characteristics of coal specimens were investigated. Experimental results show that strength, elastic strain energy, dissipated energy, brittleness index, as well as impact energy index decrease with increasing water content. Besides, the failure mode transitions gradually from splitting ejection to tensile-shear mixed failure mode as water content increases, and average fragment size shows positively related to water content. Moreover, scanning electron microscope tests results indicate that water in coal sample mainly causes the mineral softening and defects increase. Furthermore, a numerical model containing roadway excavation was established considering the water on coal burst prevention. Modelling results revealed that water injection can reduce degree of coal burst and ejection velocity of coal blocks, while it will raise up the depth of crack zone and surface displacement of roadway. Combined with laboratory tests and numerical results, the micro mechanism, energy mechanism, and engineering signifcance of water injection on coal burst prevention were fnally analyzed.

关键词： Water content Coal burst Failure mode Energy Numerical simulation

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An Experimental Study of Creep Behavior for Disturbance of Unsaturated Expansive Clay Soil

An Experimental Study of Creep Behavior for Disturbance of U...

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Virtual Conference on Disaster Risk Reduction , VCDRR 2021

作者： Halalo, Nariman Hisham Department of Geotechnical Engineering Civil Engineering Faculty Damascus University Damascus Syria

ISBN: (纸本)9789811655425

Most expansive clay soils are sensitive to the disturbance in their internal structure as a result of the extraction of samples because of the destruction in the natural soil structure. So a change in the properties of the expansive soil happens. The objective of this research is to conduct a laboratory study of the effect of the disturbance of expansive clay partially saturated soil samples on Secondary compression index (Ca) using the experimental method by conducting laboratory tests, i.e., (Oedometer experiment) of the soils in this research. In addition to that, the clay soil is material with permeability is very low and viscous and therefore, the water needs to be a long time to get out of the soil. This greatly affects the compression process and determines the beginning of the secondary consolidated settlement. Comparisons between simulations and experimental results showed that the behavior of the partially saturated expansive clay soil influenced by the method of forming the sample and is achieved through the relationship between vertical deformation and with logarithm of time, and is achieved during the secondary consolidated of the settlement, which increases linearly with the logarithm of time under constant pressure and slope of this line (Ca) at the time and method of sample formation. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Clay

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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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Numerical and theoretical study of large-scale failure of strata overlying sublevel caving mines with steeply dipping discontinuities

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1799-1815页

作者： Kaizong Xia Zhiwei Si Congxin Chen Xiaoshuang Li Junpeng Zou Jiahao Yuan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China School of Urban Construction Changzhou UniversityChangzhou 213164China Faculty of Engineering China University of Geosciences(Wuhan)Wuhan 430074China

The deformation and fracture evolution mechanisms of the strata overlying mines mined using sublevel caving were studied via numerical ***,an expression for the normal force acting on the side face of a steeply dipping superimposed cantilever beam in the surrounding rock was deduced based on limit equilibrium *** results show the following:(1)surface displacement above metal mines with steeply dipping discontinuities shows significant step characteristics,and(2)the behavior of the strata as they fail exhibits superimposition ***,failure first occurs in certain superimposed strata slightly far from the ***,with the constant downward excavation of the orebody,the superimposed strata become damaged both upwards away from and downwards toward the *** process continues until the deep part of the steeply dipping superimposed strata forms a large-scale deep fracture plane that connects with the *** deep fracture plane generally makes an angle of 12°-20°with the normal to the steeply dipping *** effect of the constant outward transfer of strata movement due to the constant outward failure of the superimposed strata in the metal mines with steeply dipping discontinuities causes the scope of the strata movement in these mines to be larger than *** strata in the metal mines with steeply dipping discontinuities mainly show flexural toppling ***,the steeply dipping structural strata near the goaf mainly exhibit shear slipping failure,in which case the mechanical model used to describe them can be simplified by treating them as steeply dipping superimposed cantilever *** taking the steeply dipping superimposed cantilever beam that first experiences failure as the key stratum,the failure scope of the strata(and criteria for the stability of metal mines with steeply dipping discontinuities mined using sublevel caving)can be obtained via iterative computations from the ke

关键词： sublevel caving mines universal distinct element code(UDEC)numerical approach large-scale ground movement steeply dipping superimposed cantilever beam toppling failure

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PERFORMANCE OF SAND DUNES IN STABILIZING HIGHLY EXPANSIVE SOIL

Journal of GeoEngineering

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Journal of Geoengineering 2021年第1期16卷 23-34页

作者： Elsawy, Mohamed B.D. Geotechnical Engineering and Foundations Department of Civil Engineering Faculty of Engineering Tabuk University Tabuk Saudi Arabia Geotechnical Engineering and Foundations Department of Civil Engineering Faculty of Engineering Aswan University Aswan Egypt

The expansive soil and sand dunes are abundant in desert areas at which new cities have been constructed. One of the effectively mitigation techniques for the expansive soil is to mix it with a non-swelling soil. This paper aims to study the influence of different sand dunes fractions, varying from zero to 50%, on the behaviour of the highly expansive clay. The clay-sand mixtures were also chemically stabilized by 10% of lime. The samples were remoulded according to the modified AASHTO compaction tests results. Swelling and strength tests were performed on each mixture. The results showed that mixing sand dunes with expansive clay reduced its swell potential and swelling pressure. The reductions increased as the increment of sand fraction. The swell potential and swelling pressure of the clay reduced to approximately the one-third when utilizing 50% sand. But mixing lime and sand with clay caused further significant reductions in swell properties. The swell potential and the swelling pressure of the clay were approximately suppressed when it was stabilized by 50% sand and 10% lime. Adding sands to clays had a negative effect on the strength. The CBR and UCS values of the clay-sand mixture decreased with increasing sand fractions. Once adding lime to the clay-sand mixtures, the CBR and UCS after 8-weeks curing time increased. The increments raised with increasing of sand fraction. The existence and the increment of sand dunes in clay influenced effectively on the chemical reactions with lime. © 2021. All Rights Reserved.

关键词： Lime

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