云南省某高速公路隧道岩溶段处治技术研究

以云南省某高速公路隧道岩溶段为研究背景,以隧道的勘察设计资料及岩溶段揭露的整个过程为基础,研究了隧道岩溶发育规律,运用TGP、地质雷达和超前地质钻孔等预报技术进行了溶洞段超前地质预报,综合分析后得出了该溶洞的发育情况,结合数值分析的成果提出了一种新的溶洞处理方法,即将该段岩溶处治方案分为洞内和地表两部分,洞内处治采取超前地质预报+超前局部断面帷幕注浆+超前预支护+旋喷桩基底加固+衬砌结构加强+确保防排水体系+监测等技术措施的综合手段;地表处治采用周围截排水+底部挂网喷混封闭+水泥土+土石回填+表面封闭+监测等技术手段。经过施工及现场监控量测结果表明,这项新的溶洞处理方案能够保证围岩的稳定性及施工的安全性,为岩溶隧道的处理提供了参考和借鉴。

Study on Treatment Technology of Karst Section of a Highway Tunnel in Yunnan Province

Based on the investigation and design data of the tunnel and the whole process of karst section exposition,this paper studies the development law of tunnel karst,and uses TSP,geological radar and advanced geological drilling technology to predict the karst section of a highway tunnel in Guangdong province.The geological conditions of the cave are advanced,and the development of the cave is obtained.Based on the numerical analysis,a new cave processing method was proposed.The section of the karst treatment program was divided into two parts of the cave and the surface of the cave.Advanced geological forecast + advance section of the curtain curtain grouting + advance support + spiral pile foundation reinforcement + reinforced lining to ensure that the water system + monitoring and other technical measures of the integrated means was used in the cave;surface treatment used the bottom of the drainage net + bottom hanging net spray mixed with soil + soil + backfill + closed + surface monitoring and other technical means.The results of construction and site monitoring show that the new cave treatment scheme can ensure the stability of surrounding rock and the safety of construction,and provide reference for karst tunnel treatment.