摘要:从钻孔轨迹、地质因素及水泥浆置换3个方面,结合施工过程中收集的具体资料,对内蒙古白家海子矿井中央进风井冻结管下放困难的问题进行了深入探讨。结果表明:定向拐点、钻孔方位角、地层产状和岩性以及水泥浆液对沉管困难均有影响,然而其主控影响机制为670~690 m层位的泥岩遇水膨胀致使钻孔缩径。
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