下牙谷地岩溶内涝成因分析与治理工程方案设计

Cause Analysis of Karst Waterlogging and Scheme Design of the Control Project in Xiaya Karst Valley

广西凤山县金牙乡下牙谷地内涝是当地危害最严重的岩溶内涝灾害之一,连续高强度降雨、封闭的地形地貌条件以及地下河管道排水不畅等是该地区岩溶内涝形成的主要原因。在综合考虑该地区具体的地形地貌和岩溶水文地质条件的基础上,提出了利用排水明涵及隧洞工程对地下河进行疏导并与上游地表水分流隧洞工程相结合的岩溶内涝灾害综合治理工程方案,其中排水明涵及隧洞工程长约500m,分流隧洞工程长约8.5km,并采用相关规范标准对排水明涵及隧洞的排水量和断面进行了初步设计,可为该地区岩溶内涝灾害治理提供依据。

Waterlogging in the Xiaya valley is one of the most serious karst waterlogging disasters in Jinya Country,Fengshan County,Guangxi Zhuang Autonomous Region.The main causes of waterlogging are continuous high intensity rainfall,closed topographic and geomorphic conditions and impeded drainage of underground rivers and pipelines.Considering the specific geological and geomorphic conditions and karst hydrogeological conditions of the area,this paper proposes a comprehensive treatment project of karst waterlogging,which combines dredging of underground river with Open Culvert and Tunnel （OCT） project and upstream surface water diversion tunnel project.The OCT is about 500m,and the diversion tunnel project is about 8.5 km.And the paper also designs the discharge section of flood drainage open culvert and tunnel based on the relevant standards,which can provide the basis for the control of karst waterlogging disaster in the study area.