深部倾斜岩层巷道非对称变形影响机制研究  

Study on the Influence Mechanism of Asymmetric Deformation of Deep Inclined Rock Roadway

作　　者：彭岩岩 徐家楠 PENG Yanyan;XU Jianan(School of Civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing,Zhejiang 312000)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000 [2]浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000

出　　处：《绍兴文理学院学报》2024年第8期19-26,共8页Journal of Shaoxing University

基　　金：国家自然科学基金面上项目“干湿交替-爆破振动耦合下含空区高陡岩坡力学响应特征及其失稳机理研究”(42277154)。

摘　　要：为研究深部倾斜岩层巷道非对称变形的影响因素和力学机制,以徐州矿区旗山矿-1000 m深处水平开拓巷道为工程背景,采用FLAC^(3D)软件,建立45°倾斜岩层巷道计算模型,并结合地质力学模型得出巷道围岩变形破坏的一般规律和裂纹形成的力学机制。结果表明:1)45°倾斜岩层巷道围岩体由于剪切刚度的不足,在巷道两帮率先出现非对称变形破坏;2)深部巷道非对称变形主要是由于高地应力对结构面产生的法向挤压作用导致软弱岩层发生扩容,以及岩层倾角对层间结构面产生的切向剪切滑移,二者都表现出岩体结构的非对称变形;3)通过对比分析数值模型中的总位移等值线图与地质力学模型中的裂纹走向,发现巷道顶板左侧的剪切型裂纹扩展贯通是巷道围岩破坏的主要原因。In order to study the influencing factors and mechanical mechanisms of asymmetric deformation in deep inclined rock roadway,a 45°inclined rock roadway calculation model was established using FLAC^(3D) finite difference numerical software,with a horizontal development roadway at a depth of-1000m in Qishan Mine,Xuzhou Mining Area as the engineering background.The general laws of deformation and failure of the surrounding rock of the roadway and the mechanical mechanism of crack formation were obtained by combining with geological mechanics models.The results show that:1)The surrounding rock mass of the 45°inclined rock layer roadway exhibits asymmetric deformation and failure on both sides of the roadway due to insufficient shear stiffness;2)The asymmetric deformation of deep tunnels is mainly caused by the normal compression effect of high ground stress on the structural planes,which leads to the expansion of weak rock layers,and the tangential shear slip caused by the dip angle of rock layers on the interlayer structural planes,both of which exhibit asymmetric deformation of rock structures;3)By comparing and analyzing the total displacement contour map in the numerical model with the crack direction in the geomechanical model,it was found that the shear type crack propagation and penetration on the left side of the roadway roof are the main reasons for the failure of the roadway surrounding rock.

关 键 词：深部巷道 非对称变形 45°倾斜岩层 高地应力 

分 类 号：TD322[矿业工程—矿井建设]