基于水力压裂法的破碎围岩探注协同机制及控制技术研究

Coordinated Positioning and Reinforcement Technology of Broken Surrounding Rock Based on Hydraulic Fracturing Method

为研究复杂构造围岩体支护难、围岩变形量大的问题,研发了基于水压致裂法的探查地下工程破碎围岩异常区装置,并利用该装置通过实验室对不同岩性进行模拟试验,直观展现破碎断层隧道演化动态全过程,并可获取隧道变形灾变演化的多元化信息,确定注浆靶点,为采用加固注浆方式提供有效依据。工业性试验表明,通过采用破碎围岩探测装置并优化注浆参数,节约注浆量,消除注浆空白带,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,为地下工程安全施工提供了技术支撑。

During the construction of underground works,it is easy to encounter geological disasters such as roof collapse,mud inrush and water inrush are prone to occur,which affects the safety,sustainability and reliability of engineering project construction.Based on the hydraulic fracturing method,a set of device for detecting the abnormal area of broken surrounding rock in underground engineering is developed.The device is used to simulate the different lithology in the laboratory,and the whole process of the evolution of the broken fault tunnel is intuitively displayed.The diversified information of the tunnel deformation and disaster evolution can be obtained,and the grouting target can be determined,which provides an effective basis for the use of reinforcement grouting.The industrial test shows that by using the broken surrounding rock detection device and optimizing the grouting parameters,the grouting amount is saved,the grouting blank zone is eliminated,and the risk of collapse and instability caused by the tunneling construction of underground engineering is reduced,which provides technical support for the safe construction of underground engineering.