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主应力轴旋转对土体的动力特性有着显著影响。利用GDS动态空心圆柱扭剪仪(HCA)能够实现内围压、外围压、轴力和扭矩四向动态加载的功能,提出了3种主应力方向变化的应力路径加载方式,分析了3种应力路径在实际工程中的应用,并进行了试验验证。当四向动载根据推导的波形函数加载时,可以实现:1平均主应力p、中主应力系数b和偏应力q保持恒定,主应力轴循环旋转的应力路径;2平均应力p和中主应力系数b保持不变,偏应力q循环变化,而主应力方向角?=90°突变的应力路径;3平均主应力p、中主应力系数b保持不变,偏应力q、主应力方向角α连续变化的应力路径。应力路径1为模拟海洋波浪荷载作用下的应力路径试验提供了理论依据,应力路径2可用于模拟不同方向地震荷载的作用,应力路径3可以模拟波浪荷载作用下桩周土体的应力路径以及交通荷载作用下的应力路径。
The rotation of principal stress axis has a significant influence on the dynamic characteristics of soil. The function of dynamic loading of internal pressure, external pressure, axial force and torque in four directions can be realized by using GDS Dynamic Hollow Cylinder Wrench (HCA). Three kinds of stress path loading modes with different directions of principal stress are proposed. Three kinds of stress The application of the path in the actual project and the experimental verification. When the four-way dynamic load is loaded according to the derived waveform function, it can be realized: 1 The average principal stress p, the middle principal stress coefficient b and the deviatoric stress q are kept constant and the stress axis of the main stress axis rotates cyclically; 2 The average stress p and the main The stress coefficient b remains constant, the deviatoric stress q changes cyclically, and the stress direction of the main stress direction angle φ = 90 ° abrupt changes; 3 the average principal stress p, the principal stress coefficient b remains unchanged, the deviatoric stress q, the principal stress direction angle α continuously changing stress path. The stress path 1 provides a theoretical basis for simulating the stress path under ocean wave loads. The stress path 2 can be used to simulate the seismic load in different directions. The stress path 3 can simulate the stress path of the soil around the pile under wave loading and the traffic Stress path under load.