高应力碎裂岩体巷道围岩承载结构与破裂特征  

Bearing Structure and Fracture Characteristics of Surrounding Rock in High Stress Fractured Rock Roadway

作　　者：张杰 孙扬[1,2] 李守奎 洪伟 王筱添 ZHANG Jie;SUN Yang;LI Shoukui;HONG Wei;WANG Xiaoxian

机构地区：[1]中国恩菲工程技术有限公司,北京100038 [2]深部金属矿采动地压灾害防控国家矿山安全监察局重点实验室,北京100038 [3]长沙矿山研究院有限责任公司,湖南长沙410012

出　　处：《中国矿山工程》2024年第6期13-18,共6页China Mine Engineering

摘　　要：深部高应力开采环境下,岩体内部节理、裂隙发育,碎裂化程度加剧,导致巷道围岩承载能力降低、变形破坏问题突出。本文采用离散断裂网络(DFN)构建含有一定碎裂结构的巷道模型,模拟埋深分别为500 m、1000 m、1500 m、2000 m和2500 m的巷道开挖过程,并结合圆形巷道围岩应力力学理论计算模型,研究高应力环境下巷道围岩承载结构特征。根据不同埋深巷道围岩应力分布规律,进行围岩承载结构分区,得到了巷道埋深与塑性区扩展关系,并揭示了高应力下碎裂岩体的破裂特征。研究结果可为类似开采条件下巷道围岩支护设计提供参考。Under the high stress mining environment in the deep part,the internal joints and fissures of the rock mass develop,and the degree of fragmentation intensifies,resulting in a decrease in the bearing capacity of the surrounding rock of the roadway and prominent deformation and damage problems.This article uses a discrete fracture network(DFN)to construct a tunnel model with a certain fragmentation structure,simulating the excavation process of tunnels with burial depths of 500 m,1000 m,1500 m,2000 m,and 2500 m respectively.Combined with the theory of stress mechanics of surrounding rock in circular tunnels,the bearing structure characteristics of surrounding rock in tunnels under high stress environments are studied.Based on the stress distribution law of surrounding rock in tunnels with different burial depths,the bearing structure of surrounding rock was divided into zones,and the relationship between tunnel burial depth and plastic zone expansion was obtained,revealing the fracture characteristics of fractured rock mass under high stress.The research results can provide reference for the design of surrounding rock support in tunnels under similar mining conditions.

关 键 词：深部开采 碎裂岩体 承载结构 应力分布 

分 类 号：TD354[矿业工程—矿井建设]