等幅干湿循环条件下膨胀土的低应力抗剪强度特征

发布时间：2018-04-04 03:03

本文选题：膨胀土　切入点：等幅干湿循环　出处：《四川大学学报(工程科学版)》2016年01期

【摘要】：为研究膨胀土的真实强度特征,采用室内常规直剪试验,对等幅度干湿循环条件下的重塑膨胀土进行低应力抗剪强度测试,研究重塑膨胀土低应力抗剪强度参数随循环次数、循环幅度的变化关系,并建立包含初始含水率、循环幅度、干湿循环次数为变量的黏聚力非线性特征函数。结果表明:在相同循环幅度和初始控制含水率下,膨胀土的黏聚力随循环次数的增加而衰减;在相同循环次数和初始控制含水率下,膨胀土的黏聚力随循环幅度的增加而衰减;内摩擦角与循环幅度和循环次数之间的关系无法用函数来表达;所建立的非线性黏聚力衰减函数是利用室内简单试验得到的,可用来计算等幅度干湿循环条件下膨胀土的黏聚力。
[Abstract]:In order to study the true strength characteristics of expansive soil, the laboratory normal direct shear test was used to test the low stress shear strength of remolded expansive soil under the condition of equal amplitude dry-wet cycle, and the low stress shear strength parameter of remolded expansive soil was studied with the cycle times.The relationship of cyclic amplitude and the nonlinear characteristic function of cohesive force including initial moisture content, cycle amplitude and dry-wet cycle number are established.The results show that under the same cyclic amplitude and initial controlled water content, the cohesive force of expansive soil decreases with the increase of cycle number, and decreases with the increase of cyclic amplitude and initial controlled water content under the same cycle number and initial controlled water content.The relationship between the angle of internal friction, the amplitude of cycle and the number of cycles can not be expressed by function, and the nonlinear cohesive force attenuation function is obtained by simple laboratory tests.It can be used to calculate the cohesive force of expansive soil under the condition of equal amplitude dry and wet circulation.
【作者单位】：中南大学土木工程学院;长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金资助项目(51538009;51578500)
【分类号】：TU443

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