非开挖穿河工程对堤防稳定性影响评价

Evaluation on Dyke Safety Affected by Trenchless Pipeline Engineering

非开挖穿河工程对堤防稳定性的影响,主是管道施工在地层中形成的扰动带对地下水渗流场的影响;依据工程实例,在考虑高洪水位以及洪水对河道冲刷等不利因素的条件下,建立地下水流数值模拟模型计算地下水流场中最大水力坡度,利用临界水力坡度法,结合有关规范推荐的安全系数,对工程诱发渗透破坏的可能性,进行定量分析。

Trenchless pipeline engineering will form an excavation disturbed zone around piping, and the zone will lead to groundwater flow variation and affect dyke safety. According to an actual engineering example, taking account of such unfavorable factors as highest flood stage and river channel erosion, a groundwater numerical simulation model is built for simulating the maximum groundwater hydraulic gradient. Based on the critical hydraulic gradient method and the safety coefficient recommended by relevant criterion, the quantitative analysis on the possibility of pipeline engineering induce infiltration destruction is study.