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以四川高山峡谷地区某大型地下洞室群为研究对象,首先通过花岗岩岩样动态压缩试验,基于应变空间的静力弹塑性损伤本构关系,建立了适宜编程的动态本构方程.然后采用显示差分方法进行完全非线性动力响应分析,研究5条不同频谱特征的地震波作用下地下洞室群围岩的损伤演化规律和损伤区的分布特征.数值模拟结果表明,随着地震波输入加速度的强度由弱逐渐变强,损伤区从洞室边墙中部逐步开始向纵深扩展,当输入的地震动幅值达到最大值时,损伤区的面积也很快达到最大值,然后损伤区面积保持不变.初步分析表明,当地下洞室群模型自振频率与地震波卓越频率偏离较远时,围岩损伤区面积会减小,而与地震波卓越频率越接近,围岩损伤区面积就会越大.
Taking a large underground cavern group in the alpine and canyland area of Sichuan Province as the research object, a dynamic constitutive equation suitable for programming is established based on the dynamic compressive test of granite samples and the static elastoplastic damage constitutive relationship in strain space. Then, Differential method for the complete nonlinear dynamic response analysis to study damage evolution and distribution characteristics of surrounding rock damage of underground caverns under the action of five different spectral characteristics of the seismic wave.The numerical simulation results show that with the strength of the input acceleration of the seismic wave from Weak and gradually weaken. The damage area gradually extends from the middle of the sidewall of the cavern to the depth. When the amplitude of the input earthquake reaches the maximum value, the area of the damaged area reaches the maximum quickly, and then the area of the damaged area remains unchanged. Preliminary analysis shows that the area of the surrounding rock damage zone decreases when the natural frequency of the underground cavern group model deviates from the excellent frequency of the seismic wave, and the closer to the optimal frequency of the seismic wave, the larger the area of the surrounding rock damage zone will be.