考虑闭合效应下基于曲线扩展路径的劈裂模型研究  

Research on splitting model based on curve propagation path involving closure effect

作　　者：浦海[1] 聂韬译[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,力学与建筑工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2015年第3期414-419,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2015CB251601);国家自然科学基金项目(51322401,U1261201);中国矿业大学中央高校基本科研业务费专项资金项目(2014YC09,2014ZDPY08)

摘　　要：深部围岩常常产生较深的劈裂破坏区。针对这一现象,引入表征体积单元,考虑原生裂隙的闭合效应,采用双曲线模拟翼裂纹扩展路径,建立了基于曲线扩展路径的劈裂破坏模型。从微观角度出发,运用应力强度因子、最大周向拉应变理论推导了劈裂裂缝扩展演化方程,提出了劈裂破坏的预测新方法。采用FISH语言,将方程内嵌入FLAC软件中,使新方法程序化。新模型与Lajtai经验公式计算结果具有很好的一致性。与旧模型相比,新模型计算结果具有更高的精度,最大相对误差减小量为25.5%。Splitting failure zones always appear in deep surrounding rocks. In response to this pheno-menon, the research has introduced REV and considered closure effect of pre-existing fracture. The hyperbolic curve has been applied to simulate the wing crack propagation path, and a splitting failure model has been established based on curve propagation path. From the microscopic point of view, stress intensity factor and maximum tensile strain theories have been applied to deduce the splitting crack propagation evolution equation. A new method to predict splitting failure has been obtained. FISH lan-guage has been applied to embed equation into FLAC, thus this new method has been programmed. The new model is well consistent with Lajtai empirical results. Compared with the old model, new model calculated results are more precise. The maximum decrease of relative error is 25.5% by using new model.

关 键 词：岩石断裂力学 应力强度因子 劈裂演化模型 翼型裂纹 

分 类 号：TD322[矿业工程—矿井建设]