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On Development Law of Karst Water and Prediction of Water Inflow in a Tunnel in Southwest China
(1 Shandong Zhengyuan Geophysical Information Technology Co., Ltd., Jinan 250101; 2 China Railway Southwest Research Institute Co., Ltd., Chengdu 611731)
Abstract Karst groundwater is a key hydrogeological problem in tunnelling. Based on the surface and borehole survey on both sides of a tunnel on Chongqing-Kunming high-speed railway, the measurement and sampling at key geological and hydrological points are carried out, and the water flows of main springs, karst caves and rivers in the studied area are rechecked. In combination with the results of water quality analysis and isotope analysis, the distribution of soluble rocks and karst development law in the tunnel area are identified, the characteristics of occurrence,supply, runoff and discharge of karst water are analyzed, and the hydraulic connections among aquifers as well as between aquifer and the surface water are clarified. The potential concentrated water burst sections, water inflow volumes and corresponding risk levels are classified according to the lithology and structure. The tunnel area is divided into one first-level karst water system and four second-level subsystems, and the water burst risk is classified into four grades. The pure soluble horizontal runoff zone of the tunnel is a high-risk section of karst water inrush.The study results are of great significance in guiding the design, construction and operation of tunnel projects.
Abstract：
Karst groundwater is a key hydrogeological problem in tunnelling. Based on the surface and borehole survey on both sides of a tunnel on Chongqing-Kunming high-speed railway, the measurement and sampling at key geological and hydrological points are carried out, and the water flows of main springs, karst caves and rivers in the studied area are rechecked. In combination with the results of water quality analysis and isotope analysis, the distribution of soluble rocks and karst development law in the tunnel area are identified, the characteristics of occurrence,supply, runoff and discharge of karst water are analyzed, and the hydraulic connections among aquifers as well as between aquifer and the surface water are clarified. The potential concentrated water burst sections, water inflow volumes and corresponding risk levels are classified according to the lithology and structure. The tunnel area is divided into one first-level karst water system and four second-level subsystems, and the water burst risk is classified into four grades. The pure soluble horizontal runoff zone of the tunnel is a high-risk section of karst water inrush.The study results are of great significance in guiding the design, construction and operation of tunnel projects.
ZHANG Junfeng1 LI Qiang2 SHI Yongyue2 WU Lei2
.On Development Law of Karst Water and Prediction of Water Inflow in a Tunnel in Southwest China[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(2): 14-21
2021, Vol. 58 