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最近河北水文四队,在河北平原东部小山附近建成一座深度199.331m的基岩标,以监测沧州市的地面沉降。 基岩标是穿过松散地层直接贯注在硬底玄武岩之上的。其结构是用108套管作为导向管,以50钻杆立标。这是河北省第
Recently, Hebei Hydrological Team 4 built a bedrock marker of depth 199.331m near the eastern hills of Hebei Plain to monitor land subsidence in Cangzhou City. Bedrock passes through loose formations directly over hard bottom basalt. Its structure is the use of 108 bushing as a guide to 50 drill pipe legislation. This is the first in Hebei Province