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孤山煤矿位于长江下游冲积平原,在长江北岸的靖江县境内。该地区第四纪冲积层厚达200米左右,表土地层条件较为复杂,其特点是流砂层厚。一九七五年以来,我矿先后用钻井法完成了北井主井、风井和南井主井、风井等四个井筒的表土段施工,在立井钻井法施工方面积累了很多好的、成功的经验。但是,也有不少值得记取的教训,如今年元月八日,南井风井在壁后注浆过程中,发生井壁上浮3.40米的浮井事故,就是其中的一例。 为了防止今后此类事故的再次发生,使立井钻井法施工技术更趋完善,本文在介绍
Gushan Coal Mine is located in the lower reaches of the Yangtze River alluvial plain, in the north of the Yangtze River in Jingjiang County. The Quaternary Alluvial Layer in this area is about 200 meters thick, and the topsoil formation is more complicated. Since 1975, the mine has successively completed the construction of the surface soil of four wellbores such as the main shaft of the north well, the main shaft of the north well, the main shaft of the south well and the shaft of the wind shaft by drilling method, and accumulated a great deal of good and successful results in the shaft drilling method construction experience of. However, there are quite a few lessons to be remembered. One of them, for example, was a well-known floating-shaft accident that floated up to 3.40 meters on the well wall during the post-mortem grouting on January 8 this year. In order to prevent the recurrence of such accidents in the future, so that shaft drilling method construction technology more perfect, this article describes