不同频谱地震作用下大型地下洞室群损伤演化特征  

Damage Evolution of Large Underground Caverns Under Earthquakes of Various Frequency Spectra

作　　者：张玉敏[1,2] 朱泽奇[2] 黄志全[1] 王安明[1] 

机构地区：[1]华北水利水电大学,资源与环境学院,河南郑州450045 [2]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,湖北武汉430071

出　　处：《应用基础与工程科学学报》2017年第4期780-792,共13页Journal of Basic Science and Engineering

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)

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.To study the evolution and distribution of surrounding rock of underground caverns, the dynamic compression test on granite sample was conducted, and the dynamic constitutive relations suitable to computer programming were established in terms of static strain-based elastic-plastic damage constitutive relation. And then the fully nonlinear dynamic analysis was conducted for some large underground caverns in the gorge and mountain region in Sichuan Province in terms of explicit difference method by inputting five earthquakes of various frequency spectra. The results show that the damage zone basically extends from the middle of side walls into deep region as the input seismic waves gradually become strong. The area of damage zone gets maximum value immediately after the acceleration reaches peak, and then stays constantly thereafter. The initial analysis shows that the maximum area of damage zone will increase when the dominant frequency of input wave approaches the natural frequency of underground caverns and vice versa. Those findings are important to rationally understand the earthquake response behaviors of large underground caverns, and they may present precious data for earthquake resistant design and construction of practical projects.

关 键 词：频谱 地下洞室群 损伤演化 损伤区 地震 自振频率 

分 类 号：TU45[建筑科学—岩土工程] P315[建筑科学—土工工程]