长时高压K0固结黏土的卸载力学特性试验研究

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摘要针对深厚表土井筒建设中深部土的特殊受力工况，开展深部重塑黏土的长时高压K0固结及“恒轴压、卸围压”试验，获得长时高压K0固结黏土在卸载应力路径下的偏应力–轴向应变曲线及三轴抗压强度，分析固结时间、固结应力对土样变形特性及强度的影响。研究表明：长时高压K0固结黏土的卸载偏应力–轴向应变曲线呈近似理想的刚塑性应力–应变曲线；固结时间和固结应力可显著影响土的三轴抗压强度；固结应力恒定，抗压强度随固结时间延长而增大，但增幅逐渐减小，二者近似成对数曲线关系；固结时间恒定，抗压强度随固结应力增加而增大，固结应力和三轴抗压强度显著相关。本研究有助于更深入地认识深部黏土的原位力学性状。

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关键词 ：土力学, 深部黏土, 固结时间, 高压K0固结, 卸载试验, 力学特性

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.

Key words： soil mechanics deep clay consolidation time K0 consolidation under high stress unloading test mechanical properties

收稿日期: 2013-08-13

引用本文:

陈国庆1，2，王衍森1，冷阳光1，张春虎1. 长时高压K0固结黏土的卸载力学特性试验研究[J]. 岩石力学与工程学报, 2014, 33(sl): 2996-3002.
CHEN Guoqing1，2，WANG Yansen1，LENG Yangguang1，ZHANG Chunhu1. EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF LONG-TERM K0 CONSOLIDATED CLAY UNDER HIGH STRESS DURING UNLOADING. , 2014, 33(sl): 2996-3002.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/2996

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