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常用的室内土动力试验设备,如单向动三轴仪、双向振动三轴仪等,在循环加载过程中主应力的方向和大小的变化均受到一定的限制。动态空心圆柱剪切仪能模拟各种复杂应力路径加载模式,是目前研究主应力变化对土体性状影响的理想设备。推导了恒定主应力偏转角循环加载方程和常广剪应力主应力轴循环加载方程,对比加载方程理论与试验加载曲线峰值,其相对误差在1.3%～2.5%之间,由此验证了动态空心圆柱剪切仪能实现复杂加载的能力。构建了两组模拟交通荷载的加载方程,为模拟真实交通荷载引起路基土体单元应力路径变化的空心圆柱循环加载试验提供了思路。
Commonly used indoor soil dynamic test equipment, such as unidirectional triaxial apparatus, two-way vibration triaxial apparatus, etc., in the cyclic loading process the direction and size of the main stress changes are subject to certain restrictions. Dynamic Hollow Cylinder Shear can simulate various complicated stress path loading modes, which is the ideal equipment for studying the influence of principal stress on soil properties. The cyclic loading equations of the constant principal stress deflection angle and the cyclic loading equations of the principal stress axis of the constant shear stress are deduced. The relative error between the theory of loading equation and the peak value of the loading curve is between 1.3% and 2.5%, which verifies the dynamic hollow Cylindrical shear instrument to achieve the ability to load complex. Two sets of loading equations for simulating traffic load were constructed, which provided a train of thought for simulating the cyclic loading of hollow cylindrical columns caused by the real traffic load.