基于探注协同控制的深部松软破碎围岩支护技术研究

Research on Deep Soft and Broken Surrounding Rock Support Technology Based on Exploration and Injection Cooperative Control

为解决地下工程岩性复杂、节理发育的断层破碎带问题,基于水压致裂法研制一套探查地下工程破碎位围岩异常区装置,确定注浆靶点,并采用浅深孔配合网格式加固注浆方式,形成浅部注浆孔加固圈,深部注浆稳定岩层效果。工业性试验表明:通过采用破碎围岩探测装置、浅深孔配合浆方法和注浆孔优化布置的三位一体破碎围岩探注协同定点定位加固技术,节约注浆量,消除注浆空白带,减小了浅部注浆固结载荷,并使浅部注浆固结圈与充填离层后的稳定顶板共同承载,有利于控制围岩变形,提高了断层破碎带地段围岩的稳定性,避免地下工程坍塌失稳事故发生,为地下工程安全施工提供技术支撑。

In order to solve the problem of fracture zone with complex lithology and developed joints in underground engineering.Based on the hydraulic fracturing method,a set of devices for detecting the abnormal area of the roadway broken site surrounding rock was developed,the grouting target point was determined,and the shallow and deep holes were combined with the grid pattern reinforcement grouting method to achieve the effects which would generate a reinforcement circle in the shallow grouting hole,and the stable rock formation in deep grouting hole.Industrial tests show that through the use of broken surrounding rock detection device,shallow and deep hole coordinated grouting method and optimized arrangement of grouting holes,the three-in-one broken surrounding rock exploration and injection coordinated fixed-point positioning and reinforcement technology can save grouting volume,eliminate grouting blank zones,and the load of the shallow grouting consolidation circle is reduced,and the shallow grouting consolidation circle and the stable roof after filling the separation layer are jointly supported,which is beneficial to controlling the deformation of the surrounding rock and improving the stability of the surrounding rock in the fault fracture zone.It reduces the risk of collapse and instability caused by underground construction,and provides technical support for safe construction of roadway engineering.