切顶沿空留巷巷旁“刚-柔”联合支护技术研究  

Roadway side rigid-flexible combined support technology of the gob-side entry retaining with roof cutting

作　　者：焦建康 JIAO Jiankang(Coal Mining Research Institute Co.,Ltd of CCTEG,Beijing 100013,China;Coal Mining and Design Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;Coal Mining Branch,China Coal Research Institute,Beijing 100013,China)

机构地区：[1]中煤科工开采研究院有限公司,北京100013 [2]天地科技股份有限公司开采设计事业部,北京100013 [3]煤炭科学研究总院开采研究分院,北京100013

出　　处：《煤炭工程》2023年第6期45-49,共5页Coal Engineering

基　　金：国家自然科学基金项目(52004126,52174080);山西省科技重大专项项目(20191101017);中煤科工开采研究院科技创新基金(2020KCMS03)。

摘　　要：针对切顶沿空留巷巷旁支护体破坏严重、留巷侧变形量大的难题,建立了切顶留巷围岩结构模型,理论分析了顶板岩层运移特征和巷旁支护体的受力过程,结合工程实际,提出巷旁刚-柔联合支护技术和工艺流程,得出如下结论:基于切顶留巷技术原理,顶板岩层运移过程可划分为快速垮落阶段、弯曲下沉阶段和压实稳定阶段;在不同运移阶段,巷旁支护体分别经历动态冲击、纵向受压、侧向受挤的受力过程;根据顶板运移规律及支护体受力特征分析,要求巷旁支护体要同时具有瞬时抗冲击、纵向可缩、侧向抗压的能力;通过在回采工作面液压支架上铺设钢丝绳+金属网,架后打设“可缩性U型钢+钢筋网”形成刚-柔联合支护体,可有效减小巷旁支护体的变形和破坏。In view of the serious destruction of road-side support and large deformation at the side of gob-side entry retained by roof cutting,the structural model of surrounding rock is established,and the movement characteristics of roof strata and the stress process of side entry support are theoretically analyzed.Combining with the engineering practice,the rigid-flexible combined support technology and process flow at the side of roadway are proposed,and the following conclusions are drawn:based on the principle of roof cutting and roadway retaining technology,the movement process of roof strata is divided into rapid collapse stage,bend-subsiding stage and compact-stabilizing stage;in different stages of migration,the road-side support body experiences dynamic impact,longitudinal compression and lateral compression,respectively;according to the analysis of the roof movement law and the stress characteristics of the support,it is required that the road-side support should have the ability of instantaneous impact resistance,longitudinal shrinkage and lateral compression resistance at the same time;by laying steel wire rope+metal mesh on the hydraulic support of the mining face,and setting retractable U-shaped steel+reinforcement mesh behind the support,a rigid flexible combined support body is formed,which can effectively reduce the deformation and damage of the roadway side support body.

关 键 词：切顶卸压 沿空留巷 岩层运移 围岩控制 巷旁支护 

分 类 号：TD353[矿业工程—矿井建设]