岩溶地区抽水蓄能电站水库渗漏问题分析OA

The complex geological structure in karst areas,especially the extensive distribution of dissolved pores,dissolved fractures and karst pipelines,poses numerous challenges to the site selection and reservoir formation of pumped storage power stations.Due to the pres-ence of adverse karst geological phenomena,reservoir seepage remains one of the most complex problems faced by hydropower projects in karst areas.To analyze the karst development law and seepage problems of pumped storage power station reservoirs in karst areas,taking the lower reservoir of a pumped storage power station in Guizhou as an example,the karst development law and potential seepage channels of the lower reservoir were analyzed based on field investigations of karst hydrogeology,combined with the results of geophysical prospec-ting,drilling and other works.The results show that the strata in the reservoir area are dominated by medium-thick bedded limestone with high purity such as the Maokou Formation(P2m),with a large thickness of soluble rocks.Affected by lithology and structure,karst de-velopment is intense.The reservoir area is located on the eastern limb of an anticline and in close proximity to it.The left and right banks of the Tuoluo River where the reservoir is located are of discharge type and recharge type respectively.The aquicludes such as the Liangs-han Formation(P2l)at the reservoir bottom are buried at a great depth,resulting in poor formation sealing conditions.After reservoir im-poundment,there is a high possibility of seepage on the left and right banks and at the reservoir bottom.Due to good sealing conditions in terms of terrain and lithology,the possibility of adjacent valley seepage in the reservoir is low.The research results can provide a refer-ence for the construction of pumped storage power station projects in karst areas.