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北皂煤矿为年产90万吨的矿井,副井井筒净直径6米,现浇混凝土井壁壁厚400毫米,井筒淋水为9米~3/时。马头门最大净断面37.7米~2,最大掘进断面67.4米~2,永久支护为双层钢筋混凝土(其断面如图1)。马头门所处围岩为含油泥岩,岩石的普氏系数f=0.7～1.0,易风化片落,塑性变形和膨胀量大。一、副井马头门施工副井东马头门长26.7米,西马头门长13.9米。从79年9月24日破壁至80年2月4日结束,工期长达4个多月。这主要是由于
Beizao Coal Mine is an annual output of 900,000 tons of mines, shaft diameter of 6 meters, the wall thickness of cast-in-place concrete wall 400 mm, well watering 9 meters to 3 / hour. Ma Tau Mun largest net section of 37.7 m ~ 2, the largest heading section of 67.4 m ~ 2, permanent support for the double-decker reinforced concrete (section of Figure 1). Ma Toumen where the rock is oil-bearing mudstone, the Platts coefficient of rock f = 0.7 ~ 1.0, easy to weathering film falling, plastic deformation and large amount of expansion. First, the auxiliary shaft Ma Tau door construction Auxiliary Weimar door 26.7 meters long, west head 13.9 meters. From September 24, 79 to 80, February 4, the end of the construction period of up to 4 months. This is mainly due to