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一、水文地质条件简述 计算地段位于某市西部。计算区东部和东南部为低山丘陵,西部和西北部为冲-洪倾斜平原,上覆第四系包括杨柳河冲洪积扇、南沙河冲洪积扇的全部。以及太子河冲洪积扇的小部分(图1),这些冲洪积扇主要由中晚更新世时形成的砂砾石砂卵石组成,厚40—80米,其它地段为粘性土和冲积砂,共同组成孔隙潜水含水层。下复寒武系和奥陶系碳酸盐岩为主的地层,岩溶发育深度在该组地层顶板下80—120米,组成隐伏裂隙岩溶承压含水层,其分布与区内第四系分布不完全一致(图1)。第四系底部为一套冰碛泥砾,成为上层孔隙潜水和下层裂隙岩溶承压水的间隔越流层,使两个相对独立的渗流系统组成一个孔隙潜水—裂隙岩溶承压水双层渗流系统耦合结构。
First, a brief description of hydrogeological conditions Calculated lot is located in the west of a city. The calculation area is in the eastern and southeastern part of the hilly region, and the western and northwestern parts are the red-flood inclined plain. The overlying Quaternary includes all of the alluvial fan of Yangliuhe and the alluvial fan of Nanshahe. (Fig. 1). These alluvial-accumulating fans are mainly composed of gravel and sand pebbles formed in the middle and late Pleistocene with thicknesses of 40 to 80 meters. The other sections are clayey soils and alluvial sand, Together to form pore aquifers. Lower Cambrian and Ordovician carbonate rocks. The depth of karst development is 80-120 meters below the roof of this group of strata, forming the concealed fractured karst aquifer, and the distribution is similar to Quaternary distribution Not exactly the same (Figure 1). At the bottom of the Quaternary is a set of moraine mudstones, which become the interlayer of the upper and lower fractured karst confined water, allowing two relatively independent seepage systems to form a pore subduction-fractured karst confined water double seepage System coupling structure.