复杂岩溶区深埋长隧洞线路比选优化实践

复杂岩溶区的深埋长隧洞在施工过程中不仅易发生涌水、突水、突泥等地质灾害,同时也可能引发一系列地下水环境问题。因此,隧洞应尽可能在非(或弱)岩溶化地层中穿越,以便最大限度地减少对地下水的疏干影响。选取滇中引水工程复杂岩溶区某一深埋长隧洞为研究对象,以水文工程地质调查及测绘为基础,充分借助钻探、地下水示踪试验及大地电磁测深等技术手段,宏观上对研究区深部岩溶的发育程度进行判断,并对研究区地下分水岭部位进行了较准确的界定,为隧洞线路最优化选择提供了合理、准确、可行的依据。经综合分析,确定比选线路2为最终优化线路。

Optimization of route selection for deep buried long tunnel in complex karst area

In the construction of deep buried long tunnel in complex karst region, geological disasters such as water burst, wa-ter inrush, mud burst and so on are prone to occur and may lead to a series of groundwater environmental problems. Therefore, the tunnel should be constructed in non ( or weak) karst area to minimize the drainage of groundwater. Taking a deep buried long tunnel in complex karst area of water diversion project in central Yunnan Province as an example, we judged the development de-gree of the deep karst on macro scale and defined the accurate position of underground watershed in the study area based on hydrological and engineering geological survey and mapping, together with technical methods of drilling, groundwater tracer test and earth electromagnetic sounding. The results provided a reasonable, accurate and feasible basis for the optimization of tunnel route .