考虑渗流作用的深部巷道围岩让压——锚注耦合控制规律研究  

Study on the Coupling Control Law of Yield Pressure-Anchor Grouting of Surrounding Rock in Deep Roadway Considering Seepage

作　　者：顾明丽[1] 党钧陶 GU Mingli;DANG Juntao(Department of Road and Bridge Engineering,Inner Mongolia Vocational and Technical College of Communications,Chifeng 024005,China;School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]内蒙古交通职业技术学院道路与桥梁工程系,内蒙古赤峰024005 [2]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《金属矿山》2023年第11期161-166,共6页Metal Mine

基　　金：内蒙古自治区教育厅项目(NJSY18332)。

摘　　要：地下水的存在给巷道围岩稳定带来了较大威胁,为了研究地下水渗流作用对深部巷道支护的影响,基于渗流对岩体体积力等效理论和让压—锚注锚杆的等效强度准则,应用弹塑性理论,推导了渗流作用下巷道围岩塑性应力场与塑性区分布的理论解,并利用等效圆方法给出了考虑现场渗流作用下的让压—锚注锚杆支护方案参数确定方法。以鲁西南地区某矿为例,给出了矿井回风大巷的锚杆长度、间排距、预紧力等参数,通过FLAC3D数值模拟对支护参数取值合理性进行了验证。研究表明:(1)考虑渗流作用后,巷道围岩塑性区增大,稳定性系数减小,通过减小间排距能够有效减少塑性区分布;(2)通过理论计算确定现场参数,利用数值模拟验证结果表明:现场支护方案能够显著提高巷道稳定性,有效减少塑性区的范围,控制围岩变形。The existence of groundwater poses a great threat to the stability of roadway surrounding rock.In order to study the influence of groundwater seepage on the support of deep roadway,based on the equivalent theory of seepage on rock mass volume force and the equivalent strength criterion of cavity-anchoring bolt,the theoretical solution of plastic stress field and plastic zone distribution of roadway surrounding rock under seepage action is derived by applying the elastic-plastic theory.The method of determining the parameters of the bolting scheme considering the field seepage is given by using the equivalent circle method.Taking a mine in southwest Shandong Province as an example,the parameters of bolt length,interrow distance and pre-load force of the main roadway of the mine return air are given,and the rationality of the supporting parameters is verified by FLAC3D numerical simulation.The results show that:①Considering the seepage effect,the plastic zone increases and the sta-bility coefficient decreases,and the distribution of plastic zone can be effectively reduced by reducing the spacing between rows.②The field parameters were determined by theoretical calculation,and the numerical simulation verification results showed that the field support scheme significantly improved the stability of the roadway,effectively reduced the range of plastic zone,and controlled the deformation of surrounding rock.

关 键 词：地下开采 渗流 锚杆支护 弹塑性理论 稳定性分析 FLAC3D 

分 类 号：TD325[矿业工程—矿井建设]