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Physics-based and data-driven modeling for stability evaluation of buried structures in natural clays

Journal of Rock Mechanics and geotechnical engineering 2023年第5期15卷 1248-1262页

作者： Fengwen Lai Jim Shiau Suraparb Keawsawasvong Fuquan Chen Rungkhun Banyong Sorawit Seehavong Institute of Geotechnical Engineering Southeast UniversityNanjing211189China Faculty of Civil Engineering and Geosciences Delft University of Technology2628 CN Delftthe Netherlands School of Engineering University of Southern QueenslandToowoombaQLD4350Australia Department of Civil Engineering Thammasat School of EngineeringThammasat UniversityPathumthani12120Thailand College of Civil Engineering Fuzhou UniversityFuzhou350116China

This study presents a hybrid framework to predict stability solutions of buried structures under active trapdoor conditions in natural clays with anisotropy and heterogeneity by combining physics-based and data-driven ***-element limit analysis(FELA)with a newly developed anisotropic undrained shear(AUS)failure criterion is used to identify the underlying active failure mechanisms as well as to develop a numerical(physics-based)database of stability numbers for both planar and circular *** considerations are given for natural clays to three linearly increasing shear strengths in compression,extension,and direct simple shear in the AUS material *** obtained numerical solutions are compared and validated with published solutions in the literature.A multivariate adaptive regression splines(MARS)algorithm is further utilized to learn the numerical solutions to act as fast FELA data-driven surrogates for stability *** current MARS-based modeling provides both relative importance index and accurate design equations that can be used with confidence by practitioners.

关键词： Buried structures Natural clays Active trapdoor Undrained stability Multivariate adaptive regression splines (MARS) Finite element limit analysis(FELA)

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COMPARING DIFFERENT MACHINE LEARNING OPTIONS TO MAP BARK BEETLE INFESTATIONS IN CROATIA

COMPARING DIFFERENT MACHINE LEARNING OPTIONS TO MAP BARK BEE...

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2023 Free and Open Source Software for Geospatial, FOSS4G 2023

作者： Kranjčić, N. Cetl, V. Matijević, H. Markovinović, D. Faculty of Geotechnical Engineering University of Zagreb Varaždin Croatia Department for Geodesy and Geomatics University North Varaždin Croatia

This paper presents different approaches to map bark beetle infested forests in Croatia. Bark beetle infestation presents threat to forest ecosystems. Due to large unapproachable area, it also presents difficulties in mapping infested areas. This paper analyses available machine learning options in open-source software QGIS and SAGA GIS. All options are performed on Copernicus data, Sentinel 2 satellite imagery. Machine learning and classification options are maximum likelihood classifier, minimum distance, artificial neural network, decision tree, K Nearest Neighbor, random forest, support vector machine, spectral angle mapper and Normal Bayes. Kappa values respectively are: 0.71;0.72;0.81;0.68;0.69;0.75;0.26;0.60;0.41 which shows highest classification accuracy for artificial neural networks method and lowest for support vector machine accuracy. © 2023 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Geographic information systems

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Numerical Study of the Geogrid Reinforced Soil Wall Incorporating Strain-Softening Constitutive Soil Model 7

Numerical Study of the Geogrid Reinforced Soil Wall Incorpor...

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7th International Conference on Material Strength and Applied Mechanics, MSAM 2024

作者： Salari, Mahdi Shafaie, Vahid Emamian, Seyed Ali Herczeg, Géza Rad, Majid Movahedi Faculty of Civil Engineering Kharazmi University Tehran Iran Department of Structural and Geotechnical Engineering Széchenyi István University Gyor9026 Hungary Department of Water and Civil Engineering Laval University QC Canada

ISBN: (纸本)9781643685472

This study embarks on a numerical exploration of Geogrid Reinforced Soil Walls (GRSW), employing finite difference analysis to compare two soil constitutive models, highlighting the efficacy of a refined strain-softening model. This innovative approach markedly improves the prediction of GRSW performance, particularly aligning the safety factor more closely with real-world observations. Notably, the strain-softening model demonstrates a superior ability over the perfectly plastic model by significantly reducing the mean overall error in predicting maximum geogrid strain overall from 51% to 30%, reflecting a significant 41% improvement in precision, thereby presenting a significant tool for enhancing geotechnical design practices. The research underlines the potential of this model to elevate the safety and reliability of GRSW constructions, contributing to elevated design standards within the field of geotechnical engineering. © The Author(s), 2024.

关键词： Safety factor

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Sustainability of lime stabilized road subgrade in mountainous regions of Türkiye

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Journal of Mountain Science 2023年第8期20卷 2436-2452页

作者： Yavuz ABUT İlknur BOZBEY Ece KURT BAL Department of Transportation Engineering Faculty of EngineeringYalova UniversityYalova 77200Türkiye Geotechnical Engineering Division Civil Engineering DepartmentAvcilar CampusIstanbul University-CerrahpasaAvcilar/Istanbul 34320Türkiye Civil Eng. M.Sc.&Geoph.Eng.Sentez Geopier FoundationsIstanbul 34320Türkiye

In this paper the use of lime stabilized subgrade for low volume roads in two regions with high mountains and different frost penetration conditions in Türkiye was investigated in terms of design,performance,and *** on unstabilized and stabilized subgrade were designed for two regions(Izmir and Van),covering all climate *** resilient modulus of the lime stabilized subgrade with different soil pulverization levels for non-freezing and freezing conditions were taken from a previous laboratory *** effects were considered in pavement design using two different approaches,including limited subgrade frost penetration method and reduced subgrade strength *** application and evaluation were performed for all *** stabilized subgrades significantly reduced the thickness of base courses,and the benefit of lime stabilization was highly dependent on soil pulverization level.A detailed cost analysis on the unstabilized and stabilized cases found that the use of lime stabilization in the subgrade provided significant initial cost *** analysis by using the AASHTO(1993)method and KENPAVE software,and quantity effect of soil pulverization level on the performance of low volume roads from a service life perspective,show that subgrade resilient modulus can be *** is also possible to make correct performance estimation in the *** results of the study show that lime stabilization is a good solution for low volume roads in the mountainous regions of Türkiye.

关键词： Aggregate Surfaced Roads Lime Stabilization Soil Pulverization Levels Road Design Service Life Cost analyses

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RESEARCH CONCERNING THE UPCYCLING OF AIR-COOLED BLAST FURNACE SLAG FROM OLD CĂLAN DUMP AS ADMIXTURE IN CLINKER PRECURSOR

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UPB Scientific Bulletin, Series B: Chemistry and Materials Science 2024年第4期86卷 231-244页

作者： Timiș, Andrei-Lucian Pencea, Ion Karas, Zbynek Priceputu, Adrian Ungureanu, Constantin Niculescu, Florentina Turcu, Ramona-Nicoleta Marcu, Dragoș-Florin Ciucă, Sorin Iacob, Gheorghe Doctoral School of the Materials Science and Engineering Faculty National University of Science and Technology POLITEHNICA Bucharest 313 Splaiul Independenţei Bucharest Romania Destro Kladno s.r.o. Sykorice 216 Zbecno Czech Republic Department of Geotechnical and Foundation Engineering Technical University of Civil Engineering 124 Lacul Tei Bucharest Romania Department of Geological Engineering Faculty of Geology and Geophysics University of Bucharest 6 Traian Vuia Bucharest Romania Faculty of Materials Science and Engineering National University of Science and Technology POLITEHNICA Bucharest 313 Splaiul Independentei Bucharest Romania

Cement is produced at large scale worldwide i.e., more than 4 billion tonnes. Romania produced circa 10.2 tonnes in 2022. 1.5 tonne, mainly limestone (≈70%wt.) and clay (21%wt.), is consumed for 1 tonne of clinker while 0.9 tonne of CO2 is released in atmosphere. Also, energy consumption per tonne of clinker ranges from 3.68 to 6.87 gigajoules. Hence, there is a higher preoccupation to find out solutions for greening the cement industry. One of the best solutions is to replace the genuine raw materials with waste or by-product like ferrous slag. This paper shows that the substitution of a part of genuine clinker precursors with air-cooled blast furnace slag (ACBFS) has at least 3 advantages i.e., preserves genuine irreplaceable resources, diminish energy consumption and reduces the CO2 footprint as ACBFS do not contain significant free CaO. The paper addresses the main technological characteristics of the clinker precursors i.e., grindability and clinker ability of four ACBFS admixed receipts. For a better valorization of the ACBFS deposited in Călan dump further research are envisaged to find out the optimum receipt of the ACBFS admixed clinker precursor. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Blast furnaces

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Comparative effects of twin-stacked tunnel excavation on adjacent structure using different simulation models

Comparative effects of twin-stacked tunnel excavation on adj...

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ITA-AITES World Tunnel Congress, WTC 2024

作者： Sittiamornporn, Nattavich Jongpradist, Pornkasem Phutthananon, Chana Chayaroon, Arthit Malaisree, Phattarawan Department of Civil Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Geotechnical and Foundation Engineering Co. Ltd Bangkok Thailand MAA Consultants Co. Ltd Bangkok Thailand

ISBN: (纸本)9781032800424

The increase in transportation in urban areas has made it inevitable to excavate the twin-stacked tunnels and consequently affect adjacent structures. Therefore, an appropriate evaluation of the impact of tunnel excavation on the nearby building has been necessary to prevent the damage that may occur to the structure. In current engineering practice, there are various methods with different degrees of complexity to assess the impact on the building. This study presents a comparison of the effect caused by twin-stacked tunnel excavation on adjacent pile-supported structures by using three different simplified analysis methods. The results reveal that each method gives different results and the distance between the tunnels and the nearest pile affects the computed results. This study indicated that the tunneling analysis with the loaded pile method (FEM-LP) is more appropriate and conservative for the building impact assessment of the piled supported structures. The tunneling in green field (FEM-GF) conditions is proven to not be the conservative method. © 2024 The Author(s).

关键词： Piles

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Swelling behaviors of heterogeneous red-bed mudstone subjected to different vertical stresses

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Journal of Rock Mechanics and geotechnical engineering 2024年第5期16卷 1847-1863页

作者： Kang Huang Zhangjun Dai Chengzeng Yan Fei Yu Wei Zhang Shanxiong Chen State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Faculty of Engineering China University of GeosciencesWuhanChina International Joint Research Center for Deep Earth Drilling and Resource Development China University of GeosciencesWuhan430074China

In this study,the axial swelling strain of red-bed mudstone under different vertical stresses are measured by swell-under-load method,and the microstructure of mudstone after hygroscopic swelling is studied by mercury intrusion porosimetry(MIP).The weakening coefficient and Weibull distribution function are introduced into the coupling model of mudstone moisture diffusion-swelling deformation-fracture based on finite-discrete element method(FDEM).The weakening effect of moisture on mudstone's mechanical parameters,as well as the heterogeneity of swelling deformation and stress distribution,is *** microcrack behavior and energy evolution of mudstone during hygroscopic swelling deformation under different vertical stresses are *** results show that the axial swelling strain of mudstone decreases with increase of the vertical *** low vertical stresses,moisture absorption in mudstone leads to formation of cracks caused by hydration-induced *** high vertical stresses,a muddy sealing zone forms on the mudstone surface,preventing further water *** simulation results of mudstone swelling deformation also demonstrate that it involves both swelling of the mudstone matrix and swelling caused by crack ***,crack expansion plays a dominant role in mudstone *** increasing vertical stress,the cracks in mudstone change from tensile cracks to shear cracks,resulting in a significant reduction in the total number of *** the evolution of mudstone kinetic energy shows similarities under different vertical stresses,the evolution of strain energy varies significantly due to the presence of different types of cracks in the *** findings provide a theoretical basis for understanding the hygroscopic swelling deformation mechanism of red-bed mudstone at various depths.

关键词： Heterogeneous red-bed mudstone Self-sealing band Matric swelling and crack expansion FDEM Microcracks Energy evolution

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Preface for machine learning and artificial intelligence in geotechnics : Opportunities and challenges

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Journal of Central South University 2024年第11期31卷 3819-3822页

作者： PAN Qiu-jing CHEN Xi ZHANG Jin-zhang LI Feng-wei ZHANG Dong-ming TANG Chong School of Civil Engineering Central South UniversityChangsha 410075China Key Laboratory of Urban Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing 100044China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong kong SAR 999077China China Railway Construction Corporation Ltd. Beijing 100855China Department of Geotechnical Engineering Tongji UniversityShanghai 200092China State Key Laboratory of Coastal and Offshore Engineering and Institute of Earthquake Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China

The rapid evolution of the digital economy has brought significant opportunities and challenges to the field of geotechnical and underground *** the scale of these projects continues to grow,their planning,design,construction,and maintenance generate extensive multi-source and heterogeneous *** data include site investigation reports,design blueprints,and structural deformation monitoring records,all of which capture the intricate and diverse characteristics of geotechnical ***,risks and hazards during the construction phase pose potential threats to engineering safety,enhancing the need for effective risk management strategies.

关键词： deformation artificial underground

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Failure behavior and strength model of blocky rock mass with and without rockbolts

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International Journal of Mining Science and Technology 2024年第6期34卷 747-762页

作者： Chun Zhu Xiansen Xing Manchao He Zhicheng Tang Feng Xiong Zuyang Ye Chaoshui Xu School of Earth Sciences and Engineering Hohai UniversityNanjing 210024China Key Laboratory of Water Management and Water Security for Yellow River Basin Ministry of Water Resources(under construction)Zhengzhou 450003China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyBeijing 10083China Faculty of Engineering China University of GeosciencesWuhan 430074China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China School of Chemical Engineering Faculty of SciencesEngineering and TechnologyThe University of AdelaideAdeliade 5005Australia

To better understand the failure behaviours and strength of bolt-reinforced blocky rocks,large scale extensive laboratory experiments are carried out on blocky rock-like specimens with and without rockbolt *** results show that both shear failure and tensile failure along joint surfaces are observed but the shear failure is a main controlling factor for the peak strength of the rock mass with and without *** rockbolts are necked and shear deformation simultaneously happens in bolt reinforced rock *** the joint dip angle increases,the joint shear failure becomes more *** number of rockbolts has a significant impact on the peak strain and uniaxial compressive strength(UCS),but little influence on the deformation modulus of the rock *** the Winkler beam model to represent the rockbolt behaviours,an analytical model for the prediction of the strength of boltreinforced blocky rocks is *** agreement between the UCS values predicted by proposed model and obtained from experiments suggest an encouraging performance of the proposed *** addition,the performance of the proposed model is further assessed using published results in the literature,indicating the proposed model can be used effectively in the prediction of UCS of bolt-reinforced blocky rocks.

关键词： Blocky rock mass Rockbolt ground support Uniaxial compression test Failure mechanism Uniaxial compressive strength model

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Effects of seepage pressure on the mechanical behaviors and microstructure of sandstone

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Journal of Rock Mechanics and geotechnical engineering 2024年第6期16卷 2033-2051页

作者： Xuewei Liu Juxiang Chen Bin Liu Sai Wang Quansheng Liu Jin Luo State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Faculty of Engineering China University of GeosciencesWuhan430074China Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province School of Civil EngineeringWuhan UniversityWuhan430072China

Surrounding rocks of underground engineering are subjected to long-term seepage pressure,which can deteriorate the mechanical properties and cause serious *** order to understand the impact of seepage pressure on the mechanical property of sandstone,uniaxial compression tests,P-wave velocity measurements,and nuclear magnetic resonance(NMR)tests were conducted on saturated sandstone samples with varied seepage pressures(i.e.0 MPa,3 MPa,4 MPa,5 MPa,6 MPa,7 MPa).The results demonstrate that the mechanical parameters(uniaxial compressive strength,peak strain,elastic modulus,and brittleness index),total energy,elastic strain energy,as well as elastic strain energy ratio,decrease with increasing seepage pressure,while the dissipation energy and dissipation energy ratio ***,as seepage pressure increases,the micro-pores gradually transform into meso-pores and *** increases the cumulative porosity of sandstone and decreases P-wave *** numerical results indicate that as seepage pressure rises,the number of tensile cracks increases progressively,the angle range of microcracks is basically from 50-120to 80-100,and as a result,the failure mode transforms to the tensile-shear mixed failure ***,the effects of seepage pressure on mechanical properties were *** results show that decrease in the effective stress and cohesion under the action of seepage pressure could lead to deterioration of strength behaviors of sandstone.

关键词： Rock mechanics Mechanical property Seepage pressure Numerical simulation Microcracks

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