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孔集煤矿西风井冻结段（含流砂层）首次试验采用沥青钢板柔性井壁。该种井壁外层为混凝土砌块，内壁为钢筋混凝土，两者间有沥青层和钢板层。据初步设计估算，采用这一井壁结构，可减少井筒压煤６００万ｔ。
Kongji coal mine westerly well frozen section (including sand layer) for the first time the use of flexible steel asphalt wall. This kind of borehole wall is a concrete block, the inner wall is reinforced concrete, with asphalt layer and steel layer between the two. According to preliminary design estimates, the use of this wall structure, can reduce the wellbore pressure coal 6000000 t.