深部大断面硐室破坏机制与锚注控制方法研究  

Failure mechanism of deep large section chamber and anchor injection control method

作　　者：王琦[1,2,3] 张皓杰[1,2,3] 江贝[1,2,3] 黄玉兵 张朋[1,2] 许硕 刘博宏 WANG Qi;ZHANG Haojie;JIANG Bei;HUANG Yubing;ZHANG Peng;XU Shuo;LIU Bohong(Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan,Shandong 250061,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116 [3]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《采矿与安全工程学报》2020年第6期1094-1103,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51674154,51704125);山东省重点研发计划项目(2017GGX30101,2018GGX109001);煤炭资源与安全开采国家重点实验室开放研究基金项目(SKLCRSM18KF012)。

摘　　要：随着矿井开采深度增加,深部大断面硐室围岩出现大变形、底鼓、支护失效、非对称破坏甚至冒顶等控制难题。本文以厚冲积层万福煤矿永久泵房为背景,通过现场监测、钻孔探测对破碎围岩进行分区,分析原支护方案下围岩的变形破坏机制。系统研究硐室相对位置和开挖次序、锚注支护和关键部位补强支护等不同因素对围岩变形控制效果的影响机制,建立围岩控制率和变形协调率评价指标,提出深部大断面硐室优化设计方法,同时提出“一次钎杆注浆定孔,二次锚网喷浆支护,三次锚注一体加固,关键部位加密强化,完整砌碹强度储备”的大断面硐室非对称分阶段控制方法。现场应用表明,该方法有效控制了深部大断面硐室的非对称变形,为类似硐室设计与施工提供了参考。With the increase of mining depth,control problem such as large deformation,floor heave,support failure,asymmetric damage and even roof fall occur in surrounding rock of deep large section cavern.With permanent pump house with thick alluvium in Wanfu Coalmine as background,the broken surrounding rock is divided into zones,and the deformation and failure mechanism of surrounding rock under the original support scheme is analyzed through on-site monitoring and borehole detection.The influence mechanism of relative position of chamber and excavation sequence,bolt-grouting support and reinforcement support of key parts on deformation control effect of surrounding rock is systematically studied.The evaluation indexes of surrounding rock control rate and deformation coordination rate are established,and the optimization design method of deep large section chamber is put forward.Meanwhile,the asymmetrical phased control method of large section chamber is put forward,namely,“primary drill rod grouting,secondary anchor net shotcreting support,anchoring grouting as one piece,encryption and reinforcement in key parts,and complete masonry strength reserve”.Field application has shown that this method can effectively control the asymmetric deformation of deep large cross-section chamber,which provides a reference for similar chamber design and construction.

关 键 词：深部 大断面 硐室 破坏机制 锚注控制 

分 类 号：TD323[矿业工程—矿井建设]