增压式真空预压地基处理法用于存量污泥填埋坑治理  

Application of Vacuum Preloading Foundation Treatment with Air Pressure Boosted Method to Management of Sludge Storage Landfill Pit

作　　者：耿震[1] 金亚伟 刘刚[1] GENG Zhen;JIN Ya-wei;LIU Gangl(Wuxi Municipal Design Institute Co. Ltd., Wuxi 214072, China;Jiangsu Xintai Geotextile Material Co. Ltd., Yixing 214268, China)

机构地区：[1]无锡市政设计研究院有限公司,江苏无锡214072 [2]江苏鑫泰岩土科技有限公司,江苏宜兴214268

出　　处：《中国给水排水》2018年第8期63-66,共4页China Water & Wastewater

摘　　要：某垃圾填埋场存在一个面积约17 000 m2、深度约23 m的市政污泥填埋坑,其污泥含水率超过80%,污泥剪切强度低,无法保证垃圾体边坡的整体稳定,存在失稳的风险。采用增压式真空预压地基处理法处理,首先在污泥内注射调理剂,然后插入塑料排水板和增压管,并用土工膜密封,最后抽真空排水。调理剂采用柠檬酸钠和三氯化铁。处理后,污泥含水率可降至60%左右,表层的地基承载力特征值可达到45 k Pa,沉降量超过4 m。目前工程已经完工,并在污泥坑上建设了新的垃圾填埋场。There was a municipal sludge landfill pit with area of about 17 000 m2 and depth of 23 m. The moisture content of sludge was over 80%, and the shear strength was low. So the slope stability of municipal solid wastes could not be guaranteed, which could lead to the risk of instability. The vacuum preloading foundation treatment with air pressure boosted was adopted. Firstly, conditioner was injected into the sludge. Then, the plastic drainage boards and supercharging pipes were set up, and the sludge pit was sealed with geomembrane. Finally, vacuum drainage was carried out. The conditioner was com- posed of sodium citrate and iron trichloride. The moisture content of sludge could be reduced to about 60%, and the bearing capacity of the surface foundation can reach 45 kPa after handling, the settlement amount exceeded 4 m. This project has been completed and a new landfill has been built on the sludge pit.

关 键 词：存量污泥 增压式真空预压 调理剂 塑料排水板 含水率 

分 类 号：TU992[建筑科学—市政工程]