采动影响下某矿矩形巷道稳定性数值模拟分析  

Numerical simulation analysis of stability of rectangular roadway in a mine under the influence of mining

作　　者：杨宁[1,2,3] 赵美霞 YANG Ning;ZHAO Mei-xia(School of Architeture and Construction,Jiangsu Voeational Institute of Architectural Technology,Xuzhou 21116,Jiangsu,China;Jiangsu Collaborative Innovation Center for Building Energy Saving and Construct Technology,Xuzhou 21116,Jiangsu,China;Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,Shandong,China)

机构地区：[1]江苏建筑职业技术学院建筑建造学院,江苏徐州221116 [2]江苏建筑节能与建造技术协同创新中心,江苏徐州221116 [3]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《矿冶》2023年第1期6-13,共8页Mining And Metallurgy

基　　金：江苏建筑节能与建造技术协同创新中心青年博士基金资助项目(SJXTBZ2112);江苏高校“青蓝工程”资助。

摘　　要：某矿大巷受工作面回采时的采动影响出现了巷道断面收缩变形问题。针对该矿采动巷道稳定性控制难题,在分析深部采动巷道应力环境与变形特征的基础上,以该矿开拓巷道为研究背景,借助FLAC3D数值模拟手段,研究了工作面推进下采动巷道的应力场及塑性区演化规律,分析了采动系数对大巷稳定性影响机制。结果表明:随着工作面推进,采动巷道顶板处支承应力呈“脊背形”分布,塑性区急速发育,当工作面距巷道间距小于70 m后,采动巷道稳定性显著降低,采动应力系数λ对巷道稳定性影响显著,呈负相关,λ>3.0时巷道上部出现“蝶形”塑性区,变形剧烈。Roadway deformation problems such as roadway section shrinkage deformation appear under the influence of mining in a mining face.Aiming at the problem of stability control of mining roadway in this mine, based on the analysis of the stress environment and deformation characteristics of the deep mining roadways, with this mining main roadway as the engineering background, FLAC3D numerical simulation method is adopted to study the stress field and plastic zone evolution law of underground mining roadway under the advancement of the working face, and the influence mechanism of mining coefficient on the stability of main roadway.The research results show that the supporting stress at the roof of the mining roadway is distributed in a “back shape” with the advance of the working face, and the plastic zone develops rapidly.When the distance between the working face and the roadway is less than 70 m, the stability of the mining roadway is significantly reduced, and the influence of mining induced stress coefficient λ on the stability of the roadway is significant, showing a negative correlation.When λ>3.0,a “butterfly” plastic zone appears in the upper part of the roadway, and the deformation is severe.

关 键 词：采动影响 矩形巷道 数值模拟 围岩稳定性 

分 类 号：TD802[矿业工程—矿山开采]