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针对英国GDS公司动态空心圆柱扭剪仪(HCA)在主应力轴旋转试验中能够实现三向动态加载(轴力、扭矩、内围压或外围压)的功能,通过严格的数学推导,提出了3种易于实现又与实际工程背景相符合的应力路径加载方式。当三向动载满足相应的条件时,可以实现(1)平均主应力p和剪应力幅值q保持恒定的应力路径(应力路径1);(2)中主应力参数b=0.5、剪应力幅值q为常数的应力路径(应力路径2);(3)平均应力p保持不变、主应力旋转角90o突变的应力路径(应力路径3),其中应力路径1、2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3可用于模拟地震荷载作用下的土体动力特性。以上3种应力路径均不能在两向动态HCA仪中实现。
Aiming at the dynamic function of three-way dynamic load (axial force, torque, internal pressure or peripheral pressure) of the dynamic hollow cylinder torsion shears (HCA) of GDS Company in the UK in the rotation test of the main stress axis, a rigorous mathematical derivation is proposed Three kinds of stress path loading methods that are easy to implement and consistent with the actual engineering background. When the three-way dynamic load satisfies the corresponding conditions, (1) the stress path (stress path 1) with the average principal stress p and the shear stress amplitude q constant can be achieved; (2) the principal stress parameter b = 0.5, the shear stress (3) The stress path (stress path 3) where the average stress p remains unchanged and the principal stress rotation angle is 90o abruptly changes, where the stress paths 1 and 2 are the simulated ocean wave loads Which provides a theoretical basis for the stress path test. The stress path 3 can be used to simulate the dynamic characteristics of the soil under earthquake loads. The above three kinds of stress paths can not be realized in two-way dynamic HCA instrument.