论文部分内容阅读
粗粒土与结构接触面在切向应力控制三维加载条件下会出现切向变形非共轴现象,对其研究具有重要的理论意义。试验结果表明:单向圆形路径下,非共轴角在第1循环由接近90°逐渐减小,随后围绕某一数值波动,该值基本上不随循环周次变化;单位应力切向位移增量在初始剪切时由零开始增大,切向应力幅值不大时随循环周次逐渐减小,最后基本趋于稳定。往返圆形路径下,相邻2个循环周次的非共轴角符号相反;一个完整循环内,非共轴角由接近90°逐渐减小,最后基本趋于稳定,单位应力切向位移增量由小逐渐变大,然后基本趋于稳定;该稳定值在切向应力幅值不大时随循环周次逐渐减小。单向和往返圆形路径下接触面非共轴角的平均稳定值基本相同,均约为45°。切向应力幅值对接触面切向变形非共轴现象有较大影响;应力幅值越大,非共轴角越小,单位应力切向位移增量则越大。
The contact surface of coarse grained soil and structure will appear tangential deformation non-coaxial phenomenon under tangential stress control three-dimensional loading conditions, which has important theoretical significance for its research. The experimental results show that under the unidirectional circular path, the non-coaxial angle decreases gradually from nearly 90 ° in the first cycle and then fluctuates around a certain value, which basically does not change with the cycle. The unit stress tangential displacement increases The amount increases from zero at initial shearing, decreases gradually with the number of cycles when the amplitude of the tangential stress is not large, and finally tends to be stable. In the round-and-round path, the sign of non-coaxial angle of the two adjacent cycles is opposite. In a complete cycle, the non-coaxial angle decreases gradually from 90 ° to the final and then tends to be stable. The unit stress tangential displacement increases The amount gradually increased from small to small, and then tended to be stable basically; the steady value decreased with the number of cycles when the magnitude of the tangential stress was small. The average steady-state values of the non-coaxial angles of the contact surfaces in the unidirectional and reciprocating circular paths are basically the same, both about 45 °. The tangential stress amplitude has a great influence on the non-coaxial phenomenon of tangential deformation of the contact surface. The larger the stress amplitude is, the smaller the non-coaxial angle is, and the larger the unit stress tangential displacement increment is.