基于SWMM的排水管道吊洞防渗漏计算方法研究

Study on Calculation Method of Drainage Pipe Tunnel Leakage Based on SWMM

吊洞防渗漏是排水管道工程必不可少的施工环节,对排水管道工程质量具有重要影响。为此,文中提出基于SWMM的排水管道吊洞防渗漏方法研究。以吊洞溢流量最小、积水累计时间最短为目标建立目标函数,并设定约束条件,建立吊洞防渗漏模型,采用SWMM对不同重现期下吊洞渗漏情况模拟,得到最优吊洞防渗漏方案,实现基于SWMM的排水管道吊洞防渗漏。通过实际案例应用,防渗漏后吊洞闭水测试中水位下降量仅为0.05 mm,吊洞构件渗透系数不超过0.3,符合相关规范要求,具有良好的防渗漏效果。

The leakage prevention of lifting tunnel is an essential construction link of drainage pipe engineering,which plays an important role in the quality of drainage pipe engineering.Therefore,the method of leakage prevention of drainage pipe tunnel based on SWMM is proposed.The target function is established with the minimum overflow and the shortest water accumulation time,and the constraints are set,and the leakage prevention model of the lifting tunnel is established.SwMM is used to simulate the leakage of the lfting tunnel in different recurrence periods,which obtains the optimal leakage prevention scheme to realize the leakage prevention of the drainage tunnel based on SWMM.Through the actual case application,the water level drop in the closed water test after the lifting hole is only 0.05mm,and the permeability coefficient of the lifting member does not exceed o.3,which meets the requirements of relevant specifications and has good leakage prevention effect.