煤层底板裂隙的断裂力学模型及其应用  

Fracture mechanics model of fracture in the coal seam floor seams and its application

作　　者：王麒[1] 魏久传[1] 张莹莹[1] 

机构地区：[1]山东科技大学地质科学与工程学院,山东青岛266000

出　　处：《山东煤炭科技》2015年第1期50-51,53,共3页Shandong Coal Science and Technology

基　　金：山东省沉积成矿作用与沉积矿产重点实验室开放课题资助(no:DMSM201012);国家自然科学基金资助(no:41372290);中国煤炭工业协会2011年度科学技术指导性计划项目资助(MTKJ2011-369);山东省自然科学基金重点项目资助(ZR2011EEZ002);山东科技大学矿井水害防治团队资助

摘　　要：基于煤层底板裂隙的构造发育特征,建立了拉剪性裂隙的断裂力学模型,并根据断裂力学理论得出裂隙扩展的临界条件。根据实验测得的实际数据,利用RFPA2D软件,模拟了在不同岩桥倾角下翼裂纹的起裂、扩展、贯通及最后造成试件的失稳破坏过程。实验结果表明,在外部应力作用下,裂隙的起裂扩展与裂隙倾角发育的密度、间距等空间分布规律有密切关系,高角度裂隙更易于发生扩展连通,裂隙密度越大,间距越小,越易发生扩展而导致岩体失稳破坏。Based on the tectonic development characteristics of the airfoil fracture in the coal floor, the fracture mechanics model of tensile-shear fracture is established, and according to the theory of fracture mechanics, the criterion of crack propagation is worked out. According to the actual data measured in the experiment, by using RFPA2D software, the process of airfoil fracture initiation, extension, transfixion and the finally caused specimen failure under different Rock bridge angle angle is simulated. The experimental results show that, under the effect of external stress, the initiation and extension of fracture is closely related to the density, spacing and spatial distribution of the crack angle, extension and connection is easier to occur in high angle fracture, the larger crack density and the smaller spacing, the more prone to extend and lead to the rock buckling failure.

关 键 词：断裂力学 数值模拟 裂隙 

分 类 号：P542.3[天文地球—构造地质学]