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| EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF LONG-TERM K0 CONSOLIDATED CLAY UNDER HIGH STRESS DURING UNLOADING |
| CHEN Guoqing1，2，WANG Yansen1，LENG Yangguang1，ZHANG Chunhu1 |
| (1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining Science and Technology，Xuzhou，Jiangsu 221116，China；2. Company of Suning Estate，Nanjing，Jiangsu 210042，China) |
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Abstract For special conditions of deep soils in extra-thick alluvia in shaft construction，the mechanical properties of deep clay under the condition of unloading lateral stress and constant axial stress which has experienced long-term high-stress K0 consolidation were studied. The deviatoric stress-strain curves and the triaxial compressive strength were obtained；and the influences of consolidation time and stress on the clay?s deformation and strength were analyzed. The following conclusions are drawn：for the deep remolded clay，the deviatoric stress-strain curve is similar to perfect rigid-plastic curve. The consolidation time and stress have great influence on its triaxial compressive strength. When the consolidation stress is constant，the compressive strength increases with the consolidation time in nearly logarithm relation，and the increasing rate of the compressive strength decreases gradually. When the consolidation time is constant，the compressive strength increases with the consolidation stress obviously. This study is helpful for further investigation into the in-situ mechanical properties of deep cohesive soil.
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Received: 13 August 2013
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2014, Vol. 33 
