1. School of Architectural and Surveying and Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou　 341000,China; 2. Jiangxi Pro- vincial Key Laboratory of Environmental Geotechnical and Engineering Disaster Control,Ganzhou　 341000,China

基于等效弹性模型的方法,构建综合考虑含贯通—非贯通交叉节理岩体宏细观缺陷的复合损伤模型。首先,将贯通节理部分看成一定厚度的独立材料,其主要产生闭合变形及沿节理面的剪切变形,其储存弹性应变能及剪切应变能;其次,基于断裂力学及应变能理论相结合,将交叉节理中的非贯通节理岩体部分看成岩体内部宏观损伤,对节理尖端的应力强度因子进行了计算,推导得出了储存在非贯通节理中的应变能计算公式,并将岩体内部的细观损伤按Weibull分布描述,建立综合考虑宏细观缺陷的节理岩体复合损伤模型;再次,对交叉节理岩体的强度准则进行了讨论,构建考虑交叉节理不同强度准则的等效弹性模型;最后,将计算结果与试验结果进行了比较分析,模型计算结果与试验结果吻合较好,证明了模型的合理性,同时讨论了贯通节理倾角、非贯通节理倾角对岩体峰值强度及破坏准则的影响,以及非贯通节理贯通率对初始损伤变量影响规律。

Based on the method of the equivalent elastic model,the composite damage model was constructed to consid-er comprehensively the mac-roscopic and microscopic defects of the rock mass containing persistent and non-persistent joints. Firstly,the part of persistent joint was considered as an independent material with a certain thickness,which mainly produces closed deformation and shear deformation along the joint surface,which can store elastic strain energy and shear strain energy. Secondly,based on the combination of fracture mechanic and strain energy theory,the non-persistent joint rock part of the cross joint was regarded as the internal macro damage of rock mass. Therefore,the joint point of stress intensity factor was calculated,and the formula of strain energy stored in non-persistent joint was de-rived. The microscopic damage was described according to the Weibull distribution within the rock mass,and the com-prehensive consideration macro and micro defects of joint rock damage model was established. Thirdly,the strength cri-terion of cross jointed rock mass was discussed,and the equivalent elastic model of different strength criterion was con-structed. Finally,the calculated results were compared with the test results,the model calculation results are in good agreement with the experiment results,which proves the rationality of the model. In addition,the influence of persistent joint angle and non-persistent joint angle on the peak strength and failure criterion of rock mass,and the influence law of initial damage variables affected by penetration rate of non-persistent joint were discussed.

DENG Zhengding,WU Jianqi,SHANG Jiahui,et al. Equivalent elastic model and strength properties for cross-jointed rock mass containing persistent and non-persistent joints[ J]. Journal of China Coal Society,2018,43 (11):3098 - 3106.