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某矿为了满足水文地质与工程地质的要求,在渤海湾沿岸的海面上进行了海上人力廻转冲击钻探.该矿所处的地形特点,为一个向海缓倾斜的低地,海岸与陆地连接的地带极为平坦,专门水文工程所摆佈的钻孔是由海岸到300公尺的海面上.在近海岸的地段水深为1～3公尺,远海岸的地段水深为3～6公尺,个加地段则大于6公尺.海底的地层,由上到下大致有四层:即沙层及沙砾层,含10%小石砾的重粘土,亚粘士及亚沙土瓦层,坚硬的花岗岩类及风化片岩类等.海上钻深由于自然条件的不同,其钻进的方法、按装工作、人员配置等亦显著地不同于陆地钻探,且在操作过程中要注意许多特殊的技术要求.
In order to meet the requirements of hydrogeology and engineering geology, a mine was turned on the sea surface of the coast of the Bohai Bay by manpower transfer drilling, which is characterized by a gently sloping lowland that connects the coast with land The area is extremely flat and the holes drilled by specialized hydrological engineering are from the coast to 300 meters of sea. The water depth is 1 to 3 meters on the coast and 3 to 6 meters on the far coast The ground floor is more than 6 meters. The seabed consists of four layers from top to bottom: sandy and gravel layers, heavy clay containing 10% of small gravel, Yaonian and Asian sandy soil, hard granites And weathered schist, etc. Due to the difference of natural conditions, drilling at sea is different from drilling on the basis of installation work, staffing, etc., and many special technical requirements should be paid attention to during operation.