摘要
为了得到软岩巷道合理的二次支护时机,以及在工程上易于实现、经济上合理的二次支护强度,通过理论分析得出了控制围岩变形所需支护强度随围岩变形量的增大而减小的关系,提出了"让压—支护"支护理念。结合现场具体地质条件,采用数值模拟确定了不同让压条件下保持巷道围岩稳定所需的最小支护强度,得出让压140mm后施加0.2MPa的支护强度,可使围岩变形控制在工程允许范围内,该支护强度工程上容易实现且经济上也更为合理;并在邢东矿-980m水平主副暗一联巷进行试验,一次支护采用锚杆+锚索联合支护让压,二次支护采用全封闭多边形工字钢支架+围岩注浆加固,同时对试验巷道进行了围岩变形监测,监测数据表明该支护技术能较好地控制围岩变形。
In order to determine rational supporting time and intensity of soft-rock secondary supporting , it was obtained that support-ing intensity reduced with surrounding rock deformation increased by theoretical analysis and “Yield-supporting” concept was put for-ward.Combining geological condition , numerical simulation was applied to obtaining minimum supporting intensity for keeping roadway stable under different yielding conditions .It was concluded that exerting 0.2MPa supporting intensity after 140mm yielding could effec-tively control surrounding rock deformation within engineering permission , this supporting intensity could be realized easily and was e-conomical.On-the-spot test was made in connection roadway at -980m level of Xingdong Colliery.First supporting applied anchored bolt+anchored cable and secondary supporting applied whole closed I steel support +grunting reinforcement.Surrounding rock deformation observation showed that this supporting technology could effectively control deformation .
出处
《煤矿开采》
北大核心
2014年第4期68-72,共5页
Coal Mining Technology
基金
国家自然科学基金资助项目(51234005)
关键词
软岩巷道
让压-支护
围岩控制
数值模拟
soft-rock roadway
yielding-supporting
surrounding rock control
numerical simulation