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《Port Engineering Technology》 2012-04
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Discussion on Drilling Pore-forming of Maritime Loose Sand Layer

Zhao Xiangshou,Wang Hongxu(CCCC First Harbor Consultants Co.,Ltd.,Tianjin 300222,China)  
Since holes collapse and sand gushing occur frequently during the drilling pore-forming of maritime loose sand layer in one port project,soil sampling is hard to be done,which results in the difficulty of in-situ test.In long trial,we adopt the method of weighing mud protection wall and throwing in clay ball,which increase the bottom pressure and mud wall thickness of the bore hole,and prevent the bore hole from the seepage of laminated water.In addition,by controlling the drilling velocity properly,we finally resolve the drilling pore-forming problem,which guarantees precision and reality of the geologic investigation data.
【CateGory Index】: TU753.3
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