三轴试验条件下的结构性参数

Structural parameters under triaxial testing conditions

对三轴试验条件下结构性参数进行简化,得到了采用割线模量表示的结构性参数,避免了由于起始状态土体的主应力差、主应变均为0,造成基于主应力差描述的三轴试验条件下结构性参数在此状态下均无法求解的现象.通过对土体结构性参数的计算条件进行分析,构建了以主应变为单变量描述的结构性参数模型.采用单变量描述的结构性参数直观地反映了主动作用对土体结构性的影响,并且简化了结构性参数的计算过程.对甘肃省刘家峡某地黄土进行了三轴试验,探讨三轴试验条件下结构性参数的变化规律.试验结果表明:土体的力学性质由土体自身的结构特性所决定,而作用在土体上的围压、含水率等外部条件的变化会改变土体的结构特性.

The structural parameters under triaxial testing conditions were simplified to obtain secant modulus for representing the structural parameters. The solution in the numerical point of view can be obtained. Using principal strain as single variable, the new structural parameters model was established. The effect of active role on the loess structure was directly reflected by the proposed model, and the calculation of structural parameters was simplified. The triaxial test was carried out with the Liujiaxia loess from Gansu province to discuss the structural parameters. The test results show that the mechanical properties of loess are determined by its own structure, and the loess structure is always changed with external conditions of confining pressure and water content.