预留岩帽短段掘砌注浆方法在新发煤矿主井井筒封堵含水层中的应用
예류암모단단굴체주장방법재신발매광주정정통봉도함수층중적응용
Application of Step Sinking Method Under Remain Rock Plug For Closing Aquifer in Main Shaft of Xinfa Coal Mine
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