高家坪隧道岩溶水系统识别及涌水量预测

为查明在建宜保高速高家坪隧道内ZK45+995m处突水点的补给来源以及隧道区的水文地质条件,并预测可能的涌水量,在对隧道区内岩溶发育规律调查分析的基础上,先后在隧道区开展了两次地下水示踪试验,结果查明:高家坪隧道内ZK45+995m处突水点的补给来源于隧道北侧的下埫岩溶洼地,汇水面积为0.66km2,突水点所处的岩溶管道为黄龙洞岩溶水系统的西支,为单一岩溶管道类型,地下水最大流速为341 m/d,平均流速为244m/d,地下水流速快,管道介质相当发育。根据示踪试验划分的黄龙洞岩溶水系统与干洞坪岩溶水系统边界范围,并利用黄龙洞泉长期降雨量-泉流量监测数据,采用大气降雨入渗法预测高家坪隧道ZK45+995m处突水点未来可能遭遇的最大涌水量为13 216m3/d,正常涌水量为5 940m3/d,为隧道防治水方案的制定提供了水文地质依据。

Karst Water System Identification and Water Inflow Prediction in Gaoj iaping Tunnel

To find out the recharge source of the water inrush point at the ZK45 + 995 m of Gaojiaping tun-nel in YiBao highway under construction and the hydrogeological conditions of the tunnel area and to pre-dict water inflow based on the investigation and analysis of karst development law in the tunnel area,this paper carries out twice groundwater tracer tests.The results indicate that ZK45 + 995 m water inrush point under the supply comes from Xiashang karst depression on the northern side of the tunnel with the catchment area of 0.66 km2 .The karst pipe at the water inrush point,the west branch of Huanglongdong karst water system,is the single karst pipe type,where the maximum velocity of the groundwater is 341 m/d with the average flow velocity of 244 m/d.As the groundwater flow rate is fast,the pipeline medium is well-developed.According to the tracer test of karst water system which divides the boundary between Gandongping and Huanglongdong karst water system,and based on the long-term precipitation and spring discharge monitoring data of Huanglongdong Spring and the method of rainfall infiltration,the paper pre-dicts that the potential maximum and normal water inflow at ZK45+995 m water inrush point of the Gao-jiaping tunnel in the future will be 13 216 m3/d and 5 940 m3/d.The paper provides the hydrogeological ba-sis for the establishment of water prevention and control of tunnels.