高应力-节理化复合软岩巷道地质特征及支护技术  

Study on geological features and support technology of high stress-jointed complex type soft rock roadway

作　　者：朱阁[1] 张志成 李平虎 穆文平 张连杰[1] 武雄[1] 

机构地区：[1]中国地质大学(北京)水资源与环境工程北京市重点实验室,北京100083 [2]武汉市测绘研究院,湖北武汉430022 [3]天津市勘察院,天津300191

出　　处：《煤炭科学技术》2015年第9期18-23,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41172289);中央高校基本科研业务费专项资金资助项目(2012YXL043);国家科技支撑计划资助项目(2012BAJ11B04)

摘　　要：为解决鹤壁矿区深部煤矿开采过程中软岩巷道围岩大变形、难支护的问题,通过工程地质条件调查、室内试验等手段,分析鹤壁矿区软岩巷道的工程地质特点,得到软岩围岩的变形破坏力学机制。结合关键部位耦合支护理论和数值模拟技术,对软岩巷道采用锚网喷和锚索为主的支护方式,并现场监测评估支护效果。研究表明:鹤壁矿区巷道围岩属于高应力-节理化复合型软岩;变形破坏的ⅠABⅡBDⅢD型复合变形力学机制由节理、分子吸水膨胀、胶体膨胀、自重应力以及工程开挖等共同构成;采用的支护方式可使支护体应力分布平均,应力集中区范围和岩体变形均较小;经现场监测表明:在该支护条件下开挖15天后巷道围岩变形趋于稳定,30天后变形速率为0,累计变形量不超过40mm,保证软岩巷道工程的稳定性。In order to solve the high deformation and difficult support problems of surrounding rock in soft rock roadway occurred during the mining process of deep mine in Hebi Mining Area, with engineering geological condition investigation, indoor test and other means, the engineering geological features of soft rock roadway in Hebi Mining Area were analyzed and the deformation mechanics mechanism of soft surrounding rock was obtained. In combination with the ＂key position＂ coupling support theory and computer numerical simulation technol- ogy, the soft roadway was supported mainly with bolt/steel mesh/shotcreting and anchor and site monitoring, measuring and evaluation were conducted on the support effect. The study showed that the surrounding rock of roadway in Hebi Mining Area was high stress - jointed type soft rock. The complex deformation failure mechanics mechanism was jointly consisted of joint, molecular water absol-ption swelling, colloid swelling, gravity stress and engineering excavation （Type ⅠABⅡBOⅢD ）＂ In the bolt/steel mesh/shotcreting ＋ anchor support method applied to the design, the stress distribution of support mass was even and the stress concentration zone scope and the rock deform- ation were both smaller. After support engineering completed, the site monitored and measured data showed that under the support condi- tion, the deformation of mine roadway was in stabilization after 15 days of the excavation. After 30 days of the excavation, the deformation rate was 0 and the total deformation value was not over 40 ram. Thus the support status was excellent and the stability of soft rock roadway could be ensured.

关 键 词：高应力-节理化复合型软岩 变形力学机制 锚喷支护 围岩 

分 类 号：TD322[矿业工程—矿井建设]