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太原市自来水公司,为了增加城市的供水量,在开辟水源地时,新建了一批特大口径的水源井。这些工程分别承包给地质、兵器、石油、有色金属等单位施工。地质情况及钻孔设计要求: 1.地表至30米深是第四纪流砂砾石层、砾石直径大小不均,有些大于φ200毫米;30至120米为奥陶纪石灰岩,含水部位裂隙发育较强,地层破碎。第四纪和奥陶纪地层都含水,水位较浅,一般10米左右。 2.钻孔设计要求,零至30米开孔口径为1.2米,见基岩1至1.5米下入φ1.02米套管(下部为花
Taiyuan City Water Company, in order to increase the city’s water supply, in the development of water sources, the new batch of large diameter water wells. These projects were contracted to the construction of geology, weapons, petroleum, non-ferrous metals and other units. Geological conditions and drilling design requirements: 1. The surface to 30 meters deep quarry gravel layer, gravel diameter uneven size, some greater than φ200 mm; 30 to 120 meters for the Ordovician limestone, water-rich fractures developed strongly Broken strata. Quaternary and Ordovician strata contain water, shallow water, generally about 10 meters. 2. Drilling design requirements, zero to 30 meters hole diameter of 1.2 meters, see bedrock 1 to 1.5 meters into the φ1.02 m casing (the lower part of the flower