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zai mei kuang zhong shi gong jiang shui ya shen kong
Author(s): 
Pages: 66
Year: Issue:  6
Journal: Geology and Prospecting

Keyword:  地下水压力设计要求井壁管太原市深孔泥浆泵水泥浆环状间隙逆止阀施工降水;
Abstract: <正> 我队为山西太原市西山矿务局白家庄煤矿打成了一大口径降压孔,钻孔的目的是将采煤区地下水放到深部奥陶纪灰岩层中去,借以降低采煤区地下水压力,使采区不致淹没,工人生产安全. 按地质设计要求,该降压孔井深625m,开孔口径426mm,终孔口径219mm,井斜每100m不超过1°,下两套井壁管. 我们选用的设备为PS-600型水井钻机及BW850/30型泥浆泵.冲洗液用低固相PHP泥浆. 为了保证钻探施工顺利进行,在开孔前用人工挖一个φ1000mm、深7m的大孔,埋下φ425mm井口
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