考虑最大线应变理论的多重破坏机制PMC强度模型  

PMC strength model with multiple failure mechanisms considering maximum linear strain theory

作　　者：李晓光 周春雷 范栋珏 张力天 郑益武 LI Xiaoguang;ZHOU Chunlei;FAN Dongjue;ZHANG Litian;ZHENG Yiwu(University of Science and Technology Beijing,Beijing 100083,China;Construction Management Office of Agency for Offices Administration,Beijing 100082,China;Shunde Innovation School,University of Science and Technology Beijing,Foshan 528399,China)

机构地区：[1]北京科技大学,北京100083 [2]军委机关事务管理总局工程代建管理办公室,北京100082 [3]北京科技大学顺德创新学院,广东佛山528399

出　　处：《中国矿业》2022年第11期149-157,共9页China Mining Magazine

基　　金：桥梁结构和地基环境健康监测关键技术研究项目资助(编号:BK20BE008);建筑结构智能监测技术研究项目资助(编号:BK21BE014)。

摘　　要：随着深部开采工程的快速发展,岩石在高应力作用下呈现出与浅埋条件下明显区别的破坏模式和破坏强度,在这个过程中岩石伸长、剪切及压密屈服等多种破坏机制共生。针对上述问题,本文以最大线应变理论、PMC过渡型准则为理论基础,提出了适合深部岩体破坏模式过渡特征的强度理论,揭示了岩体低强度破坏内在机理,并提出了广义剪应力、平均应力及应力洛德角为参量的多破坏机制影响下强度准则的不等式统一形式。同时,采用多重破坏机制PMC强度模型对砂岩和花岗岩试验数据进行拟合。研究结果表明,岩石强度表现出了较为明显的分段强度特征,符合多重破坏机制影响下强度规律,从而验证了多重破坏机制PMC强度模型对于岩石材料的适用性。With the rapid development of deep mining engineering,the failure mode and strength of rock under high stress are obviously different from those under shallow buried conditions.In this process,a variety of failure mechanisms such as rock elongation,shear and compaction yield coexist.In view of the above problems,based on the maximum linear strain theory and PMC transition criterion,this paper puts forward the strength theory suitable for the transition characteristics of failure modes of deep rock mass,reveals the internal mechanism of low-strength failure of rock mass,and puts forward the inequality unified form of strength criterion under the influence of multiple failure mechanisms with generalized shear stress,average stress and stress Lode angle as parameters.At the same time,the PMC strength model with multiple failure mechanism is used to fit the test data of sandstone and granite,and the obvious segmented strength characteristics of rock are obtained.The research results show that the rock strength exhibits obvious segmental strength characteristics,which conforms to the strength law under the influence of multiple failure mechanisms.The applicability of PMC strength model with multiple failure mechanisms to rock materials is verified.

关 键 词：破坏模式转化 岩石强度准则 最大线应变理论 PMC模型 

分 类 号：TD313[矿业工程—矿井建设]