利用锤击试验及数值反演获取岩体平行结构面接触刚度的可行性研究

发布时间：2018-11-12 11:45

【摘要】：针对相对均匀的平行结构面,基于结构面的线性接触假设,提出了一种利用锤击试验及数值反演获得结构面接触刚度的方法。该方法实施时,在结构面两侧分别布设若干支振动传感器,在远处利用激震锤进行激震,通过结构面两侧垂直于结构面方向和平行于结构面方向振动传感器的起跳时间,计算出纵波和横波通过结构面的耗时,而后利用数值计算进行反分析,通过不断调整结构面的法向和切向接触刚度,实现与现场实测相同的耗时,从而获得该结构面的法向和切向接触刚度特性。对该测试方法的可行性进行了理论、数值方面的论证,结果表明纵波过缝耗时仅受法向接触刚度控制,横波过缝耗时仅受切向接触刚度控制,并存在一一对应的关系。而后,通过对花岗岩岩块的试验及数值分析,证明了通过锤击试验快速测试岩体结构面接触刚度的方法是可行的,且具有较好的稳定性。
[Abstract]:Based on the linear contact hypothesis of the structure plane, a method for obtaining the contact stiffness of the structural plane by hammering test and numerical inversion is proposed. When the method is implemented, a number of vibration sensors are arranged on both sides of the structural plane respectively, and the excitation hammer is used to excite the vibration in the distance. Through the take-off time of the vibration sensors perpendicular to the direction of the structural plane and parallel to the direction of the structural plane on both sides of the structural plane, The time consuming of the longitudinal wave and the shear wave passing through the structure surface is calculated, and then the numerical calculation is used to carry out the inverse analysis. By constantly adjusting the normal and tangential contact stiffness of the structural plane, the time consuming is the same as that of the field measurement. The normal and tangential contact stiffness characteristics of the structure surface are obtained. The feasibility of this testing method is theoretically and numerically demonstrated. The results show that the time consuming of longitudinal wave seams is only controlled by normal contact stiffness, and the time spent by shear wave seams is only controlled by tangential contact stiffness, and there is a one-to-one correspondence relationship. Then, through the test and numerical analysis of granite block, it is proved that the method of quick measuring contact stiffness of rock mass structural plane by hammer test is feasible and has good stability.
【作者单位】：中国科学院力学研究所流固耦合系统力学重点室验室;
【基金】：国家重点基础研究发展计划项目(2015CB250903) 中国科学院战略性先导科技专项B类项目(XDB10030303)
【分类号】：TU45

【参考文献】