摘要
在常规三轴固结排水剪（CD）试验中,按照规范整理得到了（σ1~σ3）~εa曲线和εv~εa曲线,但发现由这两条曲线确定的临界状态点不一致,不符合经典临界状态的定义。通过试验过程中试样外衬塑布的裂缝分布情况确定了试样的剪切破坏面,得出试样破坏面与试样中心轴的交点位置随围压的变化规律,对计算截面面积Ab的公式进行了推导,提出了偏应力计算取值的新方法。按照新方法计算了εv~εa和（σ＇1-σ3）~εa曲线,且由该曲线确定的临界状态点趋于一致,符合土体达到临界状态时的宏观力学现象。
In CD test of conventional triaxial test, we have obtained the and - curves according to the specification, however, the critical state points of the two curves are not consistent with each other, which does not conform to the classical definition of critical state. The damage plane of test samples were studied through the cracks distribution of the plastic cloth wrapped the sample during the test process, and the relationship between the damage point, an intersection point of damage plane and the sample central axis, and the confining pressure are analyzed. The calculation formula of section area Ab is derived, a new method for deviatoric stress calculation is put forward. The curves of and - are calculated by the new method, and the critical state points of the new curves tend to be uniform, which conforms to the soil macroscopic mechanics phenomenon at critical state.
出处
《人民长江》
北大核心
2015年第18期70-74,共5页
Yangtze River
基金
国家自然科学基金资助项目(51179097)
湖北省自然科学基金资助项目(2012FFA040)
关键词
三轴试验
固结排水
临界状态
偏应力
triaxial test
drained consolidation
critical state
deviatoric stress
