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论述管涌险情的成因。

问答题
2021-12-26 20:32
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正确答案

导致管涌险情的原因主要有:堤基内有古河道、历史溃口、强透水层等隐患,或地表隔水层遭到穿透破坏;堤身抗渗能力低,如断面尺寸小、土料抗渗性低、施工质量差、有洞穴或土石接合部不密实等隐患;长时间高水位作用下,渗透坡降变陡,渗流流速和压力加大,渗透坡降大于允许渗透坡降;土抵抗渗透变形的能力不够,如没有反滤排水措施或反滤排水效果不好。


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