宁夏青铜峡滑石沟路坝工程渗漏分析及处理措施

通过滑石沟路坝工程渗漏监测,计算不同库水位下渗漏量,找出主要渗漏段,分析渗漏原因,提出应对措施。在滑石沟库坝上游、下游设置监测断面,监测降水、蒸发、沟水、地下水等要素变化,采用水均衡法、理论公式法、有限元法、实际监测法四种方法计算监测期内库坝渗漏量,分析渗漏原因。以上四种方法的加权平均结果为日均渗漏量870 m~3/d。依据监测成果分析,路坝工程渗漏属于坝下基岩风化带渗漏,主要渗漏段在坝的左岸(桩号0+512.4~0+829.9之间)中及主河槽破碎带。在高水位时坝体渗漏量大,坝体安全可能存在较大风险。

Analysis on seepage of Huashigou Road-dam at Qingtongxia in Ningxia and its treatment measures

Through the monitoring made on the seepage of Huashigou Road-dam Project， the seepages under various reservoir levels are calculated， and then the main seepage sections therein are found out and the relevant countermeasures are proposed as well； i.e. arranging monitoring sections on both the upstream and downstream of the dam for monitoring the changes of the key factors such as the precipitation， evaporation， water in gully， groundwater， etc. and adopting four methods： water balance method， theoretical formula method， finite element method and actual monitoring method for calculating the seepage of the dam during the monitoring period and analyzing the seepage causations. The weighted average result of the daily seepage from the four methods is 870 m3/d. In accordance with the analysis made based on the monitoring result， it is considered that the seepage of the dam is the seepage from the weathered zone in the foundation rock under the dam with the main seepage sections on the left bank of the dam（between the stake numbers of 0+512.4～0+829.9）and the fractured zone in the main river channel. When the seepage is large during high water level， larger risk is to be there to endanger the dam safety.