不同频谱地震作用下大型地下洞室群损伤演化特征

发布时间：2018-05-28 17:27

本文选题：频谱 + 地下洞室群　；参考：《应用基础与工程科学学报》2017年04期

【摘要】：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.
[Abstract]:Based on the dynamic compression test of granite samples and the static elastoplastic damage constitutive relation of strain space, a suitable dynamic constitutive equation is established for a large underground cavern group in the alpine canyon area of Sichuan Province. Then the completely nonlinear dynamic response analysis is carried out by using the method of display difference, and the damage evolution law and the distribution characteristics of damage zone of underground cavern group under the action of five seismic waves with different spectral characteristics are studied. The numerical simulation results show that with the intensity of the seismic wave input acceleration increasing from weak to strong, the damage area gradually begins to expand to the depth from the middle of the wall of the cavern, and when the input amplitude of the ground motion reaches the maximum value, The area of the damaged area also reached the maximum quickly, and then the area of the damaged area remained unchanged. The preliminary analysis shows that when the natural vibration frequency of underground cavity group model deviates from the excellent frequency of seismic wave, the area of surrounding rock damage area will decrease, and the more close to the excellent frequency of seismic wave, the larger the area of surrounding rock damage zone will be.
【作者单位】：华北水利水电大学资源与环境学院;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：岩土力学与工程国家重点实验室开放基金(Z015011) 国家重点基础研究发展计划(973计划)项目(2015CB057905) 国家自然科学基金项目(51279202) 河南省科技创新人才计划项目(154100510006) 河南省重点科技攻关项目(152102210111)
【分类号】：TV223

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