叙毕铁路新高坡隧道岩溶探测及处置方案研究

Research on Karst Detection and Treatment Scheme for Xin’gaopo Tunnel of Xubi Railway

为了更好地对隧道岩溶进行探测及处置,以叙毕铁路新高坡隧道为研究对象,研究在隧道施工期岩溶地质探测及处置方面的方法。根据新高坡隧道的现场实践结果,优化岩溶水和岩溶洞穴的处置方法。研究结果表明,在叙毕铁路新高坡隧道岩溶探测及处置时,通过资料调研的方法,对探测溶腔的超前地质预报方法进行了总结与归纳,常用的超前地质预报方法有超前钻探法、地质探测法与物理探测法,在此基础上形成了综合超前地质预报技术,并在新高坡隧道进行了成功应用。调研整理目前国内外岩溶隧道岩溶处置技术,根据新高坡隧道岩溶具体情况,得出处理的基本原则是"引、堵、越、绕,因地制宜,综合治理"。然后根据数值模拟的手段,采用线性拟合的技术提出了溶洞位于隧道的不同位置(拱顶、边墙和隧底)对隧道结构的影响,分别提出了未贯穿和已贯穿溶洞的处置方案。结合我国隧道工程的实际发展水平,对新高坡隧道所遭遇的溶蚀不良地质提出了相应的处理原则与方法。

In order to better detect and treat tunnel karst,taking Xingaopo tunnel of Xubi railway as the research object,the more appropriate methods of karst geological detection and treatment during tunnel construction are studied.According to the field practice results of Xingaopo tunnel,the treatment methods of karst water and karst caves are optimized.The results show that when detecting and treating karst in Xingaopo tunnel of Xubi railway,this paper summarizes and sums up the advanced geological prediction methods for detecting dissolved cavity through the data investigation method.The commonly used advanced geological prediction methods include geological exploration method and physical exploration method.On this basis,a comprehensive advanced geological prediction technology has been formed and successfully applied in Xingaopo Tunnel.After investigating and sorting out the current karst tunnel treatment technologies at home and abroad,the determined basic principles of karst tunnel treatment are"diversion,blocking,crossing,bypassing,adjusting measures according to local conditions,and comprehensively treating".Then,according to the means of numerical simulation,the influence of different positions of karst caves(vault,side wall and tunnel bottom)on tunnel structure is put forward by using linear fitting technology,and the treatment schemes of non-penetrating and penetrating karst caves are put forward respectively.According to the actual development level of tunnel engineering in China,the corresponding treatment principles and methods are put forward for the encountered unfavorable dissolved geology body during construction of Xingaopo tunnel.