基于连续梁的薄层复合顶板锚杆受力分析  

Stress analysis of thin composite roof bolt based on continuous beam

作　　者：韦四江[1,2] 张省 翟黎伟 王猛[1,2] 刘镇书 陈可夯 陈旭[3] WEI Sijiang;ZHANG Sheng;ZHAI Liwei;WANG Meng;LIU Zhenshu;CHEN Kehang;CHEN Xu(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Collaborative Innovation Center ofCoal Work Safety and Clean High Efficiency Utilization,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Hebi Coal Industry GroupCo.,Ltd.,Hebi 458000,Henan,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]河南理工大学煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454000 [3]鹤壁煤业集团有限责任公司,河南鹤壁458000

出　　处：《河南理工大学学报（自然科学版）》2023年第2期11-18,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51974104)。

摘　　要：为研究煤矿薄层复合顶板锚网支护条件下锚杆受力问题,采用理论分析、数值模拟和现场观测方法,利用巷道顶板锚固岩层的三铰拱结构和锚杆连续梁力学分析模型,对锚杆受力和托顶煤回采巷道稳定性进行研究。结果表明:锚杆内的拉应力、剪应力和挠度均发生在顶板最下部的软岩段,深部挠度较小;弯曲变形引起的应力大于轴向直接拉伸引起的应力,弯曲变形量大于轴向拉伸变形量;除整体下沉外,巷道顶板锚固体内部不均匀断裂变形会给锚杆施加较大的弯曲载荷;选取刚度较大锚杆、强力护表构件和强力锚索,能够减小三铰拱结构的断裂角和下沉量。针对鹤煤公司九矿3204孤岛工作面托顶煤回采巷道,采用高强锚杆、加密锚索主动耦合支护,配合双层塑编网护表防漏冒,局部地段采用单体液压支柱加强支护方法,有效控制薄层复合锚固顶板的下沉,减轻锚杆(索)的弯曲变形和破断,围岩得到了有效控制。In order to study the force of the bolts of the thin composite roof of the coal mine,the theoretical analysis,numerical simulation and on-site observation methods were adopted use the three-hinged arch structure and the continuous beam mechanical analysis model of the roadway roof to anchor the rock were used to the bolt force and the stability of the top coal mining roadway.The conclusions were as follows:The normal stress,shear stress and deflection in the bolt all occur in the soft rock section at the lowest part of the roof,and the deep deflection was small;The stress caused by bending deformation was greater than the stress caused by direct axial tension,and the bending deformation was greater than the axial tensile deforma⁃tion.In addition to the overall sinking of the roadway roof anchor solid,its internal uneven fracture deformation would impose a relatively large bending load on the bolt.Fracture angle and settlement of the threehinged arch structure could be reduced by selecting the bolt with larger stiffness,strong surface protection component and strong anchor cable.Aiming at the supporting top coal mining roadway of 3204 isolated is⁃land working face in 9th coal mine of Hemei coal company,high-strength bolt and densified anchor cable were used for active coupling support.Combined with double-layer plastic woven mesh to prevent leakage and caving,single hydraulic prop was used to strengthen support in local sections,which could effectively control the subsidence of thin composite anchor roof,and reduce the bending deformation and fracture of bolt(cable).The surrounding rock was effectively controlled.

关 键 词：薄层复合顶板 三铰拱 锚杆支护 连续梁 

分 类 号：TD353[矿业工程—矿井建设]