摘要
巷道所处应力环境对围岩卸压效果具有重要影响。为探究卸压槽对不同应力环境下巷道卸压效果及卸压适用性,采用理论分析、数值模拟和现场应用的方法对非等压条件下巷道围岩卸压技术适用性进行分析。研究结果表明:卸压槽开挖会使围岩浅部应力集中向深部转移。以侧压系数λ=1为分界,当λ<1时,巷道最大剪应力主要集中于顶底板浅部;λ>1时,应力集中区转向顶底板深部。侧压系数越大,卸压槽对巷道围岩的控制效果越好,但总体上更有利于巷道两帮的稳定性。随着侧压系数的增大,巷道两帮开槽优化比例基本呈负指数函数逐渐降低,顶底板开槽优化比例逐渐增加。结合对不同应力环境下巷道卸压效果分析,依据某矿井巷道围岩的应力特征,提出针对性的控制措施并取得了良好的应用效果。
The stress environment of roadway has an important influence on the pressure relief effect of surrounding rock.In order to explore the pressure relief effect and applicability of pressure relief groove on roadway under different stress environments,the applicability of pressure relief technology of roadway surrounding rock under unequal pressure conditions was analyzed by theoretical analysis,numerical simulation and field application.The results show that the excavation of the pressure relief groove will transfer the stress concentration in the shallow part of the surrounding rock to the deep part.The lateral pressure coefficientλis divided by 1.Whenλ<1,the maximum shear stress of the roadway is mainly concentrated in the shallow part of the roof and floor.Whenλ>1,the stress concentration area turns to the deep part of the roof and floor.The larger the lateral pressure coefficient,the better the control effect of the pressure relief groove on the surrounding rock of the roadway,but it is generally more conducive to the stability of the two sides of the roadway.With the increase of the lateral pressure coefficient,the optimization ratio of the two sides of the roadway is gradually reduced in a negative exponential function,and the optimization ratio of the roof and floor is gradually increased.Combined with the analysis of the effect of roadway pressure relief under different stress environments,according to the stress characteristics of the surrounding rock of the mine roadway,targeted control measures were proposed and good application results were achieved.
作者
赵洪宝
李作泉
程辉
ZHAO Hongbao;LI Zuoquan;CHENG Hui(School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;New Energy Development and Disaster Prevention Research Center,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China)
出处
《金属矿山》
北大核心
2025年第12期18-28,共11页
Metal Mine
基金
国家重大科技专项课题(编号:2024ZD1004503)
河北省生态智慧矿山联合基金项目(编号:E2020402036)。
关键词
巷道卸压
卸压槽
侧压系数
最大剪应力
围岩收敛量
roadway pressure relief
pressure relief groove
coefficient of lateral pressure
maximum shear stress
surrounding rock convergence
