空间立管真空泥水分离试验研究

Rapid Dewatering of Waste Construction Slurry in Vertical Tubeby Vacuum Suction

设计一种空间立管真空抽吸泥水快速分离试验系统,系统由模型箱、空间过滤系统、真空控制系统和真空泵四个模块组成。开展单个空间立管真空泥水分离试验和组合空间立管真空泥水分离试验,对比研究空间立管真空泥水分离规律。试验结果表明真空度在85kPa时,单个空间立管排水最大水平影响范围在1.5~2cm内,且泥浆含水率随水平距离的增大而增大,逐渐趋于定值;多个立管组合后,不同空间位置的泥浆因受到组合空间立管、过滤板和泥浆自重的共同复杂作用,泥浆的含水率与水平距离呈波浪形非线性关系,与时间和深度呈拟线性关系。试验设计的空间立管真空泥水分离方法相比传统真空泥水分离的方法效率大大提高,试验结果为其工程推广应用提供了重要的理论支撑。

We experimentally addressed the vacuum drainage of waste construction slurry in single vertical tube and/or square tube-array with the lab-built setup.The influence of the radial distance,depth and dewatering time at 85 kPa on the water-content distribution was investigated.The results show that depending on the tube number,the newly-developed vacuum slurry dewatering with vertical tube(s) significantly outperforms the conventional vacuum mud dewatering,For example,as the radius increased to 2 cm after dewatering for 30 min,the water-content rapidly increased and slowly leveled off,weakly affected by the pressure;for a tube-array,depending on the dewatering time and depth,the water-content had a rippled,symmetric radial distribution because of the impact of the tube array,filtering and gravity.As the depth and dewatering time increased,the radial distribution of water content linearly decreased.