关键词: 深厚表土层, 人工冻结法施工, 井壁裂纹, 风井井筒

Abstract: This paper is based on the air-shaft outer lining engineering in WanFu mine. During the construction of outer lining with artificial freezing method, the line from -130m to -300m appeared crack. Through the data of informationalized construction and observation result, we suggest the non-uniform stress distribution and excessive frost heaving force is the main reason that caused the crack, so the combined supporting well curb and backboard, lowering the height of each segment, setting pressure relief groove and increasing the thickness of foam board were applied in the subsequent excavation. This method achieved good effect in subsequent construction, and application significance to other similar deeper surface soil layer engineering with artificial freezing method.