路基、堤坝和河岸等边坡或山坡的坍塌现象。形成原因常为边坡过陡、土内水分增大、岩石风化及地震、火山爆发的影响等，和边坡或山坡的岩层构造也有关系。严重时可使交通中断或水流不畅，会造成人员伤亡和财产损失。
地震造成了这个地区的煤矿坍方。
The earthquake caused the collapse of the coal mines in this district.
某连拱隧道在中导洞施工时出现坍方。
During construction of the middle drift of a multi-arch tunnel, collapse accident occurred.
对隧道坍方的认识和处理方法，在不同时期有不同的内容。
The understanding on tunnel slide and its treatment methods have different contents during different times.
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