Beijing Key Lab of Water Resources and Environment Engineering,China University of Geosciences (Beiing) Wuhan
Geomatic Institute Tianjin Institute of Geotechnical Investigation and Surveying

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 mi ne in Hebi Mining Area,with engineering geological condition investigation,indoor test and other means,the engineering geological features of soft rock roadway in Hebi Min ing Area were analyzed and the deformation mechanics mechanism of soft surrounding rock was obtained. In combination with the " key position" coupling support theory a nd computer numerical simulation technology,the soft roadway was supported mainly with bolt I steel mesh I shotcreting and anchor and site monitoring,measuring and eva luation 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 comp lex deformation failure mechanics mechanism was jointly consisted of joint,molecular water absorption swelling,colloid swelling,gravity stress and engineering excavation( Type I ABIBDID). In the bolt/steel mesh/shotcreting + anchor support method applied to the design,the stress distribution of support mass was even and the stress conc entration zone scope and the rock deformation were both smaller. After support engineering completed,the site monitored and measured data showed that under the suppo rt condition,the deformation of mine roadway was in stabillization after 15 days of the excavation. After 30 days of the excavation,the deformation rate was 0 and the total d eformation value was not over 40 mm. Thus the support status was excellent and the stability of soft rock roadway could be ensured.

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)；