循环大主应力与循环中应力耦合状态下饱和软黏土动力特性试验研究

发布时间：2018-05-24 23:11

本文选题：真三轴试验 + 交通荷载　；参考：《江西理工大学》2015年硕士论文

【摘要】：在交通荷载下,土体水平方向应力与竖直方向的应力是循环变化的,为了更加真实地还原交通荷载下土体的动力响应特性,本文进行了饱和软黏土在循环大主应力与循环中主应力耦合状态下的试验研究,主要内容如下:(1)通过不同有效固结围压下,不同毕肖甫常数的静力试验,分别探讨了毕肖甫常数、有效固结围压对饱和软黏土的应变、孔压、应力应变曲线、模量等的影响。(2)通过不排水条件下,不同循环大主应力与循环中主应力的耦合作用,探讨了动应力比、动荷载幅值对饱和软黏土的永久大主应变、永久中主应变、最小孔压比、应力应变滞回曲线等的影响,通过对永久大主应变发展规律的分析,得出了一个同时考虑循环中主应力与加载周数影响的永久大主应变经验预测模型。(3)在同时施加循环大主应力与循环中主应力的基础上,研究控制排水条件、固结围压、加荷频率,影响下饱和软黏土的动力特性。(4)通过采用不同广义剪应力,不同动应力比的试验,分析了这种动应力状态下广义剪应力、动应力比对饱和软黏土的动力特性影响。
[Abstract]:Under traffic load, the horizontal stress and vertical stress of soil are cyclic, in order to restore the dynamic response of soil under traffic load more truthfully. In this paper, the experimental study of saturated soft clay under the coupling state of cyclic large principal stress and cyclic principal stress is carried out. The main contents are as follows: 1) through different effective consolidation confining pressures, the static test of different Beishaofu constants is carried out. In this paper, the effects of Beishaofu constant and effective consolidation confining pressure on strain, pore pressure, stress-strain curve and modulus of saturated soft clay are discussed respectively. The effects of dynamic stress ratio and amplitude of dynamic load on permanent large principal strain, permanent middle principal strain, minimum pore pressure ratio, stress and strain hysteretic curve of saturated soft clay are discussed. An empirical prediction model of permanent large principal strain considering the influence of principal stress and loading cycle at the same time is obtained. On the basis of applying both cyclic principal stress and cyclic principal stress, the control of drainage conditions and consolidation of confining pressure are studied. Dynamic characteristics of saturated soft clay under loading frequency. (4) the effect of generalized shear stress and dynamic stress ratio on the dynamic characteristics of saturated soft clay under different generalized shear stress and different dynamic stress ratio is analyzed by the experiments of different generalized shear stress and different dynamic stress ratio.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU435

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