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

作　　者：Mingjing JIANG Haijun HU Jianbing PENG Serge LEROUEIL 

机构地区：[1]Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China [2]School of Geological Engineering and Surveying,Chang’an University,Xi’an 710054,China [3]Department of Civil Engineering,Laval University,Quebec G1K 7P4,Canada

出　　处：《Frontiers of Structural and Civil Engineering》2011年第2期225-238,共14页结构与土木工程前沿（英文版）

基　　金：supported by China National Funds for Distinguished Young Scientists(No.51025932);the National Natural Science Foundation of China(Grant Nos.10922158 and 40534021;the Land and Natural Resources of China(No.1212010914013).

摘　　要：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,i.e.strain-softening or strain-hardening,is remarkably influenced by the structure,void ratio,stress path and confining pressure.Natural structure,high void ratio,TC stress path,RTC stress path and low confining pressures are favorable factors leading to strain-softening.Excess pore pressure during shearing is significantly affected by stress path.The tested soils are different from loose sand on character of strain-softening and are different from common clay on excess pore water pressure behavior.The 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 paths.As 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 

分 类 号：O57[理学—粒子物理与原子核物理]