p-s平面上不同应力路径的非饱和土力学特性研究

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摘要通过7个吸力和净平均应力同时变化的非饱和含黏砂土固结试验，研究7条不同应力路径的试验在p-s-v，p-s- ，p-s- 和p-s-w空间曲线形状随角度?(净平均应力和吸力夹角)的变化规律，分析引起变化的机制，指出净平均应力是决定体变的重要因素，吸力是决定水分变化的首要条件。并探讨p-s平面上7条应力路径屈服点连线轨迹的统一表达式，建立p-s平面上屈服点连线的统一抛物线表达式。最后运用该公式预测已有的试验数据，预测结果较为理想，说明该式预测p-s平面上不同应力路径各屈服点变化规律是较为可靠的。

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关键词 ：土力学, 应力路径, 非饱和土, 吸力, 净平均应力

Abstract：Through 7 clayey sand consolidation tests of suction and net mean stress both changing，the variation laws of 7 stress paths were studied in the p-s-v，p-s- ，p-s- and p-s-w spaces with the variation between suction and net mean stress included angle ?. Where p is net mean stress；s is suction；v is specific volume； is volume deformation； is volume deformation in water phase；w is moisture content；? is angle. The test results indicate that net mean stress is a very important factors to the volume deformation；the suction is the first conditions to the moisture changing. The yielding point locus is studied and given a unifying parabola expression in the p-s plane. Finally，using the predecessor test data forecasted yielding point locus laws in the p-s plane that proved the unifying parabola expression is credible.

Key words： soil mechanics stress path unsaturated soils suction net mean stress

收稿日期: 2011-01-13

引用本文:

苗强强1，陈正汉1，朱青青2. p-s平面上不同应力路径的非饱和土力学特性研究[J]. 岩石力学与工程学报, 2011, 30(7): 1496-1501.
MIAO Qiangqiang1，CHEN Zhenghan1，ZHU Qingqing2. STUDY OF MECHANICS CHARACTERISTIC OF UNSATURATED SOILS WITH DIFFERENT STRESS PATHS ON P-S PLANE. , 2011, 30(7): 1496-1501.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I7/1496

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