深基坑开挖施工中污水控源截污方法设计研究

Design of Sewage Source Control and Interception Method in Deep Foundation Pit Excavation

传统的污水控源截污方法未从污水产生的源头加以控制,导致污水拦截效果较差,为此,设计了新的深基坑开挖施工中污水控源截污方法。从水动力和水质两方面建立深基坑开挖施工中污水水质模型,然后根据污水水质及水动力情况计算水环境对污水的容量,再通过深基坑土壤的特性控制污水源头,采用初期雨水末端截流的方式对污水实施拦截。实验中对比未控制污水时流入施工现场周围河流的COD、TP、TN含量,发现将该方法应用于深基坑开挖施工工程后,污水控制的效果较为显著。

The traditional method of sewage source control and interception is not controlled from the source of sewage,which leads to poor interception effect.Therefore,a new method of sewage source control and interception in deep foundation pit excavation is designed.The water quality model of sewage in deep foundation pit excavation is established from two aspects of hydrodynamic and water quality,and then the capacity of water environment to sewage is calculated according to the water quality and hydrodynamic situation.The sewage source is controlled according to the characteristics of soil in deep foundation pit,and the sewage is intercepted by the way of the initial rainwater at the end.By comparing the COD,TP and TN contents of the rivers around the construction site when the sewage is not controlled,it is found that the sewage control effect is more remarkable when the method is applied to the deep foundation pit excavation.