平果铝平南赤泥堆场岩溶地质问题与防治技术

    KARST PROBLEMS AND COUNT-MEASURES AT MUD STORAGE SITE IN PINGNAN

    • 摘要: 平果铝平南赤泥堆场地内受过构造强烈挤压作用的白云质灰岩可溶性中等但裂隙极为发育,在年降水量大(年均1374.2mm)、年蒸发量大(年均1572.6mm)、气温高(年均21.8C)的气候条件下,岩溶沿地质构造呈带状不均匀发育,形成了14个不同发育程度的岩溶区。堆场内浅表岩溶较深部岩溶发育,浅表岩溶的主要形态有落水洞、溶沟(槽),深部岩溶的主要形态是溶蚀裂隙。堆场内岩溶形成了小型树枝状的暗河网,且与场外地下水相联通。堆场内岩溶的渗漏有管道集中渗漏和裂隙分散渗漏两种类型,按渗漏强度可分为强岩溶渗漏区、中等岩溶渗漏区和弱岩溶渗漏区。强岩溶渗漏区的防渗措施是对于中小型的岩溶先充填,大的岩溶用盖板跨越,然后再进行防渗铺盖,其他两区则先充填、整平,再进行防渗铺盖。

       

      Abstract: There is medium Karst nature dolomite limestone at a mud storage site in Pingnan. Due to geological actions, the limestone has numerous crannies. The Karst in the dolomite limestone developed along the geology structure asymmetrically when the dolomite limestone influenced by the climate condition of high annual precipitation, high annual evaporation and high air temperature. And there are fourteen Karst areas at site. Karst is severer at shallow depth than at deep depth. The shallow Karst forms are sinkholes and Karst pits (Karst grooves). The main deep Karst form is Karst cranny. The Karst forms small underground river net and the underground water link with the underground water outside the site. The seepage at the site is pipe-seepage and cranny scatter seepage. There are strong, medium, and weak Karst seepage areas according to the seepage intensity. The method to deal with the seepage in the strong Karst seepage area is to silting the small Karst forms, step over the big Karst forms with boards, then carpet use clay and anti-seepage cloth. The method to deal with the seepage in the other Karst seepage areas are to silt the small Karst forms, chisel off the extrusive, then carpet use clay and anti-seepage cloth. 

       

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