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粘性土三轴剪切试验的实质应力和破坏条件    

Essential Stress and Failure Condition of Triaxial Shear Test of Cohensive Soil

文献类型:期刊文献

中文题名:粘性土三轴剪切试验的实质应力和破坏条件

英文题名:Essential Stress and Failure Condition of Triaxial Shear Test of Cohensive Soil

作者:赵磊[1];李琳[2];白敬[3]

第一作者:赵磊

机构:[1]新乡学院土木工程与建筑学院;[2]天津城建大学土木工程学院;[3]湖北工程学院城建学院

第一机构:新乡学院土木工程与建筑学院

年份:2015

卷号:33

期号:6

起止页码:120-122

中文期刊名:水电能源科学

外文期刊名:Water Resources and Power

收录:CSTPCD;;北大核心:【北大核心2014】;

基金:国家自然科学基金项目(41172233)

语种:中文

中文关键词:实质应力;初始各向异性;应力路径;三轴试验;K0固结

外文关键词:essential stress; initial anisotropic;stress pathl triaxial test; K0 consolidation

摘要:常规的应力路径表示方法,难以刻画粘性土三轴试验中原状土试样和重塑土试样在初始各向异性方面存在的差别,也无法给出原状土试样的压缩强度较大而拉伸强度较小现象产生的原因。对此,从等压固结和K0固结的初始应力状态特征入手,研究了不同后续加载条件对三轴试样前期应力状态的影响。结果表明,决定试样屈服和破坏的应力是考虑了试样初始应力各向异性基础之后的实质应力。原状试样等压固结三轴试验和原状试样K0固结三轴试验在实质应力p′、q′空间中的应力路径和破坏曲线,合理解释了不同前期固结条件对试样强度有显著影响。
It is difficult for common stress path chart to depict the difference of the initial anisotropic of the samples in triaxial test between the undisturbed and remolded soil. A similar inconvenience is to explain the phenomenon that the compression strength is higher whereas the tension strength is smaller for triaxial test samples, which may be induced by the initial anisotropic. Based on the initial stress state generated by the isotropic consolidation and K0 consolidation re- spectively, the influence of loading modes on the pre-stress state is studied for triaxial samples. It is concluded that the subsidiary stress is not the most rational variable to describe the yield or failure state of soil. The stress path and the fail- ure curve in the p', q' space of the essential stress are achieved for triaxial sample in isotropic consolidation and K0 con- solidation conditions. The proposed method can be used more rationally and reasonably to interpret the behavior that the consolidation mode has remarkable impact on the soil strength.

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