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孔壁失稳及冲洗液漏失是卵砾石不稳定地层中进行工程地质钻探经常遇见的问题。笔者结合近几年的工程实践对卵砾石地层的钻探技术进行了探讨。
Wall wall instability and the loss of flushing fluid are commonly encountered problems in engineering geological drilling in unstable pebbles. In the light of engineering practice in recent years, the author discusses the drilling technology of gravel stratum.