空心圆柱仪模拟波浪荷载下主应力轴旋转应力路径能力探讨

针对波浪荷载作用下土体单元复杂特殊的应力状态可利用空心圆柱仪模拟其主应力轴旋转应力路径。以波浪荷载下土体应力路径形状为出发点,推导出两向~四向空心圆柱仪(HCA仪)动力加载参数波形公式,经过理论分析验证了该表达方式的合理性,即:(1)两向振动HCA模拟只要满足内外围压差的绝对值与动偏应力q的不等式关系就可成功实现圆形应力路径的加载;(2)三向振动HCA可以模拟中主应力系数b或平均主应力p恒定不变的情况,当b值不变时,p值随主应力轴转角单调变化;(3)四向振动HCA能够较真实全面地模拟波浪荷载下土体的应力特征,同时还可实现主应力轴循环旋转过程中b、p、q三值均不变的应力状态。

Study on ability of hollow cylinder apparatus(HCA) to simulate stress path of principal stress axes rotation under wave load

Aiming at the stress state of the soil element under the wave load， the hollow cylinder apparatus（HCA） can be used to simulate its stress path of the rotation of the principal stress axes. Taking the shape of the stress path of the soil element under the wave load as the starting point， the wave equations of the two directional ~ four directional wave shapes of the dynamic loading parameters of the hollow cylinder apparatus（HCA） are derived， and then their reasonabilities are verified through the relevant theoretical analysis； i.e.（1） the loading of the circle shape stress path can be successfully realized by the two-directional vibration HCA simulation， if the absolute values of the inner and outer confining pressures and the inequality of dynamic deviator stress q are to be satisfied；（2） the three-directional vibration HCA can simulate the conditions when b or p remains constant. When b keeps constant， p is to be changed monotonously with the principal stress axial rotation angle；（3） the four-directional vibration HCA can more truly and fully simulate the stress characteristics under wave load， simultaneously， the stress state of that the three values of b， p， q remain constant during the cyclic principal stress axes rotation can be realized as well.