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Experimental study of two saturated natural soils and their saturated remoulded soils under three consolidated undrained stress paths

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Frontiers of Structural and Civil Engineering 2011年第2期5卷 225-238页

作者： Mingjing JIANG Haijun HU Jianbing PENG Serge LEROUEIL Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China School of Geological Engineering and Surveying Chang’an UniversityXi’an 710054China Department of Civil Engineering Laval UniversityQuebec G1K 7P4Canada

In this paper,an experimental investigation is conducted to study the mechanical behavior of saturated natural loess,saturated natural filling in ground fissure and their corresponding saturated remoulded soils under three consolidated undrained triaxial stress tests,namely,conventional triaxial compression test(CTC),triaxial compression test(TC)and reduced triaxial compression test(RTC).The test results show that stress-strain relation,***-softening or strain-hardening,is remarkably influenced by the structure,void ratio,stress path and confining *** structure,high void ratio,TC stress path,RTC stress path and low confining pressures are favorable factors leading to *** pore pressure during shearing is significantly affected by stress *** tested soils are different from loose sand on character of strain-softening and are different from common clay on excess pore water pressure *** critical states in p′-q space in CTC,TC and RTC tests almost lie on one line,which indicates that the critical state is independent of the above stress *** for remoulded loess or remoulded filling,the critical state line(CSL)and isotropic consolidation line(ICL)in e-log p′space are almost straight,while for natural loess or natural filling,in e-log p′space there is a turning point on the CSL,which is similar to the ICL.

关键词： stress paths static liquefaction natural soil remoulded soil loess structure total strength indices excess pore pressure

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Macro and micro failure mechanism of surrounding rock of small span tunnel under different stress paths

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Journal of Central South University 2022年第5期29卷 1616-1629页

作者： LIU He-yi CONG Yu ZHANG Li-ming ZHENG Ying-ren WANG Zai-quan ABI Erdi LIU Li-peng College of Civil of Engineering Qingdao University of TechnologyQingdao 266033China Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao University of TechnologyQingdao 266033China Chongqing Jiaotong University Chongqing 400074China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100048China

According to the different stress paths,similar model test and PFC simulation test of tunnel surrounding rock are designed to compare the failure mechanisms at macroscopic and mesoscopic *** following conclusions are drawn.1)Excavation unloading will disturb the surrounding rock to form a certain excavation damaged zone.2)Under the loading path,the stress of surrounding rock failure is 1.500 MPa;under the unloading path with initial stress of 60% σ_(Zmax) and 100% σ_(Zmax),the failure stress is 1.583 and 1.833 MPa respectively in the model test.3)In terms of the failure mode of rocks under different stress paths,tensile fractures first appear in two sides of the vertical walls;thereafter,the spandrel and arch foot are loosened due to the stress *** fractures gradually coalesce with those occurring in the vertical walls.4)In the process of excavation unloading,the proportion of shear cracks is 35.3%,and the rock is subject to strong shear *** final failure surface is approximately V-shaped.5)The tangential peak stress on the vertical walls at the free face is the lowest;the vertical walls at the free face show the poorest bearing capacity and are easily subjected to tensile failure.

关键词： stress paths similarity test PFC simulation excavation unloading macroscopic and mesoscopic scales

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Mechanical response and dilatancy characteristics of deep marble under different stress paths:A sight from energy dissipation

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Journal of Central South University 2024年第6期31卷 2070-2086页

作者： LIU Xiao-hui HAO Qi-jun ZHENG Yu ZHANG Zhao-peng XUE Yang Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China School of Energy and Power Engineering Xihua UniversityChengdu 610039China College of Water Resource and Hydropower Sichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan UniversityChengdu 610065China Southwest Municipal Engineering Design&Research Institute of China Chengdu 610036China MOE Key Laboratory of Deep Earth Science and Engineering Sichuan UniversityChengdu 610065China

Dilatancy is a fundamental volumetric growth behavior observed during loading and serves as a key index to comprehending the intricate nonlinear behavior and constitutive equation structure of *** study focuses on Jinping marble obtained from the Jinping Underground Laboratory in China at a depth of 2400 *** uniaxial and triaxial tests at different strain rates,along with constant confining pressure tests and reduced confining pressure tests under different confining pressures were conducted to analyze the mechanical response and dilatancy characteristics of the marble under four stress ***,a new empirical dilatancy coefficient is proposed based on the energy dissipation *** results show that brittle failure characteristics of marble under uniaxial compression are more obvious with the strain rate increasing,and plastic failure characteristics of marble under triaxial compression are gradually ***,compared to the constant confining pressure,the volume expansion is relatively lower under unloading *** energy dissipation is closely linked to the process of dilatancy,with a rapid increase of dissipated energy coinciding with the beginning of dilatancy.A new empirical dilatancy coefficient is defined according to the change trend of energy dissipation rate curve,of which change trend is consistent with the actual dilatancy response in marble under different stress *** existing empirical and theoretical dilatancy models are analyzed,which shows that the empirical dilatancy coefficient based on the energy background is more universal.

关键词： deep marble stress paths dilatancy energy dissipation empirical dilatancy coefficient

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