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一、区域水文地质与工程地质特征 1.岩溶发育概况本区位于杨子陆台的黔桂地台,从中泥盆统至上二迭统沉积了一整套巨厚的碳酸盐类岩层,中三迭统时沉积了巨厚的海陆交互相的泥岩和砂岩类复理式沉积。第三纪时,本区的中部百色至田东一线发生断陷,在狭长条带状的构造盆地中沉积了很厚的湖泊含煤、含油系建造及磨拉石建造。第四纪以来,本区不断上升,因此第四系沉积不厚,分布局限,仅在右江河谷两岸狭长地带有不厚(约15米)的河谷冲积层分布。由于地壳的升降运动,本区在海西运动后,发生轻微褶皱隆起,岩石剧烈破碎,加上气候湿润多雨,使碳酸盐类岩石产生强烈的岩溶化,同时使岩层含有丰富的裂隙～溶洞水和溶
I. Regional Hydrogeology and Engineering Geological Characteristics 1. Karst Development Overview This area is located on the Guizhou-Guangxi platform of Yangzi Lutai. From the Middle Devonian to the Upper Permian, a set of huge carbonate rock formations were deposited. In the middle Triassic period Sedimentary thick marine and mudstone interbedded mudstone and sandstone-type complex deposition. During the Tertiary Period, the central Baise-Tad Tau region in the central region was fault-ruptured, with thick coal deposits, oil-bearing formations and molasse deposited in narrow strip-shaped tectonic basins. Since the Quaternary period, the area has been on the rise. Therefore, the Quaternary sediments are not thick and have limited distribution. They are only distributed in the alluvial valleys of thick valleys (about 15 meters) on both sides of the Youjiang River. Due to the ascent and descent of the crust, slight fold-up occurred after the Hercynian movement, and the rock was crushed violently. Combined with humid and rainy weather, the carbonate rock produced strong karstification and the rock bed was rich in fissures ~ cave water And dissolved