垃圾渗滤液对钻孔桩的施工及其耐久性的影响

城市的扩展使得部分新建的构筑物建设在早期垃圾填埋场上,施工建筑物基础时会破坏原垃圾填埋场的防渗体系,造成含大量有害离子的垃圾渗滤液污染地下水,而且施工完成后,垃圾渗滤液也会腐蚀桩基.为评估并减少垃圾渗滤液的不利影响,以建设在垃圾填埋场上的某铁路桥梁桩基为研究对象,通过理论研究和模型计算,对垃圾渗滤液污染物的传输特点和桩基的耐久性进行分析,得出泥浆密度、泥皮厚度、渗滤历时与单桩浆液损失量的关系,地下水新增污染物浓度与泥浆损失量、泥浆参数等的关系,以及混凝土保护层厚度和去锈剂的使用对桩基耐久性的影响.

Influence of Landfill Leachate on Bored Pile Construction and its Durability

Expansion of city makes some new projects have to be built on earlier landfill.When its foundation is constructed,the current leakproof system must be damaged and the leachate which is full of impure irons will pollute underground water.Moreover,leachate would also erode concrete pile foundation after the piles are finished.To evaluate and decrease the negative influence of leachate,certain piles which are constructed on landfill are studied.By theory research and model calculation,this paper analyzes the process of pollutants transmission and the durability of piles,then draws the conclusion about the relationship of slurry density,thickness of mudcake,infiltration time and slurry loss of single pile;the relationship of newly increased pollution and slurry loss,slurry parameter;the influence of concrete protective cover and derust on pile durability.