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富水断层破碎带井筒围岩控制
引用本文:曹树刚,洛 锋,程崇胜,李国栋,郭 平.富水断层破碎带井筒围岩控制[J].岩石力学与工程学报,2014,33(8):1536-1545.
作者姓名:曹树刚  洛 锋  程崇胜  李国栋  郭 平
作者单位:(1. 重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044;2. 河北工程大学 资源学院,河北 邯郸 056038;; 3. 重庆永荣矿业有限公司,重庆 402465;4. 中煤科工集团重庆研究院有限公司,重庆 400039)
摘    要: 针对云南某新建煤矿富水断层破碎带垮塌井筒的修复难题,通过现场调研及数值模拟研究,分析富水断层破碎带井筒围岩垮塌灾变机制,提出此类地质及工程条件下围岩控制基本原则和“顺序–联合”控制方法。研究认为:(1) 断层破碎围岩受水致弱化作用后泥化严重,松散体自承能力低,塑性流动显著,是造成围岩失稳及滑移的根本原因;多次低强度无效巷修并开挖造成冒落高度增加,活化断层裂隙,导通局部含水层,是造成破碎区段大面积垮塌及涌水的直接原因;(2) 破碎围岩失稳滑移过程中存在“应力快速卸压区”、“应力过渡区”及“应力集中区”,控制重点在于针对“应力卸压导水区”进行治水封堵及岩体加固,提高其自身承载能力,降低后期支护载荷;(3) 采用滞后变形区一定距离的变角伞状超前注浆预处理,可实现堵水和加固围岩双重目的。临时支护可为后期一次、二次支护提供空间和时间;(4) 适时采用衬砌预埋注浆管方式对破碎围岩内可能存在的空洞进行壁后二次注浆回填和加固,可以提高“围岩–支护体”整体承载能力。

关 键 词:采矿工程  主斜井  断层破碎带  灾变机制  顺序&ndash联合控制  变角伞状超前注浆
收稿时间:2013-06-28

SURROUNDING ROCK CONTROL OF SHAFT IN WATER ENRICHED FAULT FRACTURE ZONE
CAO Shugang,LUO Feng,CHENG Chongsheng,LI Guodong,GUO Ping.SURROUNDING ROCK CONTROL OF SHAFT IN WATER ENRICHED FAULT FRACTURE ZONE[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(8):1536-1545.
Authors:CAO Shugang  LUO Feng  CHENG Chongsheng  LI Guodong  GUO Ping
Affiliation:(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;2. School of Resources,Hebei University of Engineering,Handan,Hebei 056038,China;3. Chongqing Yongrong Coal Mining Co.,Ltd.,Chongqing 402465,China;4. Chongqing Research Institute,China Coal Technology Engineering Group,Chongqing 400039,China)
Abstract:In order to repair the collapsed shaft at the watery zone with fault fractures in a new mine in Yunnan province,the basic principles and the“sequence-combined”control method were put forward based on the callapsing mechanism of shaft rocks obtained through on-site research and numerical simulation. The fundamental reasons of the instability and slippage of shaft rocks were found to be the serious degradation of the surrounding rock by water,the low capability of self-supporting and the distinct plastic fluidity of loose rocks in the watery zone with fault fractures. Previous multiple unsuccessful repairing led to the increase of the caving height,the activation of the fault fractures and the unblocking of the local aquifers and caused large area collapses and water gushing in the broken section. The broken surrounding rock during the process of instability and slipping had a zone of quickly release of stress,a zone of transition of stress and a zone of stress concentration. The key measure of controlling the surrounding rock is to block water flow and to reinforce the rock in the zone of stress relieved and containing groundwater flows for improving support ability of the surrounding rock and decreasing the support loading in the following stage. Variation angle umbrella-like ahead grouting are proposed to carry out from a distance behind the deformed area. The temporary support can provide the space and the time for the first and/or the secondary support later. The integral supporting capacity of the surrounding rock can be improved by embedding grouting pipes so that the secondary grouting can be applied to backfill the cavities which may exist in fractured surrounding rock.
Keywords:mining engineering  main inclined shaft  fault fracture zone  disaster mechanism  sequence-combined control  variation angle umbrella-like ahead grouting
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