黔张常铁路驼马店隧道突涌水系统辨识

为查明驼马店隧道DK48+918突涌水岩溶发育情况及岩溶水系统结构特征,首先对隧道涌水形式、涌水量、压力大小等涌水特征进行综合分析,得出岩溶隧道突涌水与隧址区岩溶发育情况、岩溶水系统结构特征密切相关.其次系统总结岩溶突涌水系统辨识的方法和技术,最后采用水文地质调查、物探、钻探、地下水示踪试验及高分辨率水文监测技术等对D...

Identification Characteristics of Water Inrush System of Tuomadian Tunnel on Qianjiang-Zhangjiajie-Changde Railway

This paper aims to find out the karst development of gushing water and the structural characteristics of karst water system in Tuo Madian Tunnel of the mileage DK48+918. Firstly, the characteristics of tunnel gushing water, such as the form, quantity and pressure of gushing water, are comprehensively analyzed. It is concluded that the karst gushing water in Tuo Madian Tunnel is closely related to the karst development in the tunnel site and the structural characteristics of karst water system. Secondly, the identification methods and techniques of karst gushing water system are systematically summarized. Finally, the characteristics of gushing water in section DK48+918 are identified by hydrogeological survey, geophysical prospecting, drilling, groundwater tracer test and hydrological monitoring technology of high resolution. The study shows that the top cover of the pipeline flow is exposed in tunnel construction. The gushing water is caused by heavy rainfall and silting of the original pipeline, and the gushing water mainly comes from the surface catchment of karst hills and depressions and funnels on the northeastern side of the tunnel. The dynamic change of gushing water with rainfall is large and the calculated maximum volume of gushing water is 50 000 m^3/d, and the instantaneous maximum inrush water volume is up to 10 000 m^3/h.