综合超前地质预报在新村隧道施工中的应用

根据新村隧道实际的工程概况和存在问题,采用红外探水和TSP地震波法对新村隧道斜井进洞掌子面前方围岩进行综合超前地质预报,结果表明围岩内部含水可能性高,节理裂隙发育较为明显,且局部易发生掉块和塌方。为保证进洞施工安全,制定了斜井进洞超前小导管预加固和掌子面堵水注浆措施,正洞开挖后,通过监控量测曲线回归分析,建立累计沉降量u随时间t发展的时态函数u=t/(a+bt),发现累计值与时间曲线和回归方程曲线高度吻合,变形量均在规范规定范围内。

Application of Comprehensive Advanced Geological Prediction in Xincun Tunnel Construction

According to the actual engineering situation and existing problems of Xincun tunnel, infrared water detection and TSP seismic wave method are used to make comprehensive advance geological prediction for the surrounding rock in front of the inclined shaft heading face of Xincun tunnel. The results show that the possibility of water content in the surrounding rock is high, the development of joints and fissures is obvious, and local falling blocks and landslides are easy to occur. In order to ensure the safety of tunnel construction, the measures of advance small pipe pre reinforcement and water blocking grouting on the face of inclined shaft are formulated. After the main tunnel is excavated, the time function u=t/(a+Bt)of cumulative settlement (u)with time (t)development is established by regression analysis of monitoring measurement curve. It is found that the cumulative value is highly consistent with the time curve and regression equation curve, and the deformation is within the scope of the specification, so the construction is safe It is suggested that the construction should be continued.