摘要
根据常规的岩爆判据,可以确定岩爆的大致分布区域,但难以得到岩爆的破坏形迹(Damaged Shape of Rockburst,DSR),为此根据岩爆的特点,推导了裂纹失稳扩展的临界长度和临界应力条件,提出了计算DSR的两级预测方法:通过裂纹失稳扩展时的临界应力,对DSR进行一级预测;在一级预测的DSR范围内加入预设裂纹,进行DSR的二级预测。针对断裂数值模拟方法的缺点,建立了基于扩展有限元(XFEM)模拟裂纹动态扩展的思路,依托ABAQUS平台,建立了XFEM二次开发的分析框架,编制了扩展有限元分析程序,进行了相关的实例验证;结合依托工程嘎隆拉隧道,从岩爆的机制、裂纹的数值仿真等方面开展研究,研究成果对高地应力地下工程的岩爆预测具有一定的参考意义。
According to the conventional rockburst criteria,it is easy to determine the approximate area of rockburst.However,the damaged shape of rockburst（DSR） can not be computed based on these theories.This paper puts forward a method of simulating rockburst.The first stage of predicting DSR can be studied through critical stress.Then the second stage can be done by introducing pre-existed crack.Finally the scope of rockburst can be got through extended finite element method（XFEM）.This problem can be overcome relying on the secondary development of ABAQUS.Through a model of fracture mechanics,it is easy to verify the feasibility and accuracy of XFEM.The DSR of Galongla can be got through simulation technology.And the result can provide guidance for the construction of underground project to prevent rockburst.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2013年第2期575-584,共10页
Rock and Soil Mechanics
基金
国家高技术研究发展专项经费(863计划)(No.2007AA11Z108)
中国科学院"西部行动计划高新技术"项目(No.KGCX2-YW-506)
