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投稿时间:2019-11-17 修订日期:2020-06-10
投稿时间:2019-11-17 修订日期:2020-06-10
中文摘要: 土体在受波浪、地震及交通荷载等荷载作用时,其相应的应力状态较为复杂,因此,在实际工程中偏应力和主应力轴方位角同时变化的情况普遍存在。目前,关于这种应力条件下原状软黏土的物理力学特性的研究尚处于起步阶段。主应力轴耦合旋转是指在主应力轴方向旋转的同时,偏应力不断增大,平均主应力、中主应力系数均保持不变。为研究主应力轴耦合旋转时原状软黏土的变形和孔压特性,基于空心圆柱扭剪控制系统(HCA),对原状软黏土进行了一系列不同初始状态的扭剪试验,探讨了不同固结倾角、中主应力系数在主应力轴耦合旋转条件下对原状软黏土的变形、孔压等特性的影响。结果表明:不同初始固结状态对软黏土的变形特性有明显的影响;主应力轴耦合旋转过程中,软黏土试样在主应力系数b = 0和0.5时的轴向变形以受压为主,在 b = 1.0时主要表现为受拉状态。不同初始固结倾角下,主应力轴耦合旋转下试样的轴向、环向和剪切变形趋势均有明显的不同;径向应变值差别不大,在b = 0.5时,试样的径向应变值接近于0。不同初始固结倾角条件下,试样的孔压峰值对应的大主应力方位角也不同,孔压累积与应变开展并不一一对应;应力和应变的变化与偏应力和主应力方位角的增加不同步,即存在明显的非共轴现象。
Abstract:Subjected to complex loads, such as wave, earthquake and traffic loads, the corresponding stress states of the foundation soil are complicated. The simultaneous variations of the deviatoric stress and principal stress direction occur in practical engineering. However, there are few studies on properties of natural soft clay under combined principal stress rotation, which means that when the principal stress axis rotates, the deviatoric stress increases continuously, and the average principal stress and the medium principal stress coefficient remain unchanged. In order to study the deformation characteristics of saturated natural soft clay under combined principal stress rotation, the torsional shear tests of natural soft clay were carried out based on the hollow cylinder apparatus (HCA). The influence of different inclined consolidation and intermediate principal stress on the deformation and pore pressure of natural soft clay under combined principal stress rotation were discussed. The results showed that the deformation behavior and pore water pressure accumulation of tested samples were significantly influenced by the intermediate principal stress coefficient b. The compressive deformation was dominated in the axial direction when b equaled to 0 or 0.5, and extensive deformation was dominated under b equaled to 1.0. The generation of axial, circumferential and torsional deformation was different obviously, while the radial deformation was almost the same, the value of radial stain was approximate 0 when b equaled to 0.5. The corresponding major principal stress angles to the maximum value of pore water pressure were different under different inclined consolidation conditions. The change of stress and strain was not synchronous with the increase of the azimuth of deviator stress and principal stress, i.e., there was an obvious non-coaxial behavior.
keywords: soft clay combined principal stress rotation inclined consolidation intermediate principal stress deformation pore pressure
文章编号:201901151 中图分类号:TU457 文献标志码:
基金项目:国家重点研发计划项目(2019YFC1510800-2);河南省高等学校重点科研项目(20A560021);国家自然科学基金项目(51679219;51809034);中国博士后基金面上项目(2019M662533);河南省科技重大专项(181100310400)
作者简介:第一作者:王钰轲(1989-),男,讲师,博士.研究方向:土体静动力学特性与本构模拟.E-mail:ykewang@163.com;通信作者:余翔,E-mail:xiang_11_yu@yeah.net
引用文本:
王钰轲,黄文清,万永帅,余翔,韩沐森,郭成超.不同初始状态软黏土在主应力轴耦合旋转下的孔压及3维变形规律[J].工程科学与技术,2021,53(2):84-94.
WANG Yuke,HUANG Wenqing,WAN Yongshuai,YU Xiang,HAN Musen,GUO Chengchao.Generation of Pore Pressure and Three-dimensional Deformation Behavior of Soft Clay with Different Initial State Under Combined Principal Stress Rotation[J].Advanced Engineering Sciences,2021,53(2):84-94.
引用文本:
王钰轲,黄文清,万永帅,余翔,韩沐森,郭成超.不同初始状态软黏土在主应力轴耦合旋转下的孔压及3维变形规律[J].工程科学与技术,2021,53(2):84-94.
WANG Yuke,HUANG Wenqing,WAN Yongshuai,YU Xiang,HAN Musen,GUO Chengchao.Generation of Pore Pressure and Three-dimensional Deformation Behavior of Soft Clay with Different Initial State Under Combined Principal Stress Rotation[J].Advanced Engineering Sciences,2021,53(2):84-94.