井筒损坏的典型原因:1.井壁承载能力不足,或者由于混凝土受腐蚀及井壁位于软岩中,特别是马头门附近的软岩中、没有疏排水措施等情况使井壁经受反复冻融而造成承载能力下降;2.井底车场巷道因支架强度不够而倒塌,存在未填实的空洞和没有仔细回收净的报废巷道,在井底车场附近开掘新巷和硐室;3.不采取专门措施就在无结构性防护措施的井筒危险带范围内采煤;4.在井筒穿过采空区及尺寸不足的煤柱段,明知采煤会影响井壁和装备而不采取保护措施; Typical causes of wellbore damage: 1. The bearing capacity of the borehole wall is insufficient, or because the concrete is corroded and the borehole wall is located in soft rock, especially in the soft rock near the Ma Taumen, the wellbore wall is subjected to repeated freezing 2. The roadway at the bottom of the underground garage collapses due to insufficient support strength, there are unfilled voids and the abandoned roadway without careful net recovery, digging new alley and cave near the underground parking lot; 3. No Take special measures to conduct coal mining within the danger zone of wellbore without structural protective measures; 4. in the wellbore passing through the gob area and under-sized pillars, knowing that coal mining will affect the wall and equipment without taking protective measures ;