Numerical simulation of high vacuum dewatering in low permeability soil

作者：Zou, Bin; Song, Chunyu^*; Zhang, Dongdong; Chen, Longzhu; Chen, Bing

来源：Journal of Harbin Institute of Technology, 2018, 50(6): 78-83.

DOI：10.11918/j.issn.0367-6234.201707195

• Low permeability
• Negative pressures
• Pore-water pressures
• Software FLAC 3D
• Soil profiles
• Transmission speed
• Vacuum degree
• Vacuum dewatering

To study the relevant laws of high vacuum dewatering in low permeability soil and improve the efficiency of dewatering, the finite difference software FLAC3D was used to simulate the dewatering process of high vacuum well under various working conditions including different time, different vacuum degree, different well depth and different distance of the two wells, mainly focusing on the amount of discharge and the pore water pressure. According to the amount of total discharge and the distribution of pore water pressure under different distance of the two wells, suggestion of the reasonable distance of the two wells was given based on the soil profile of Ningbo metro Yinghua Station. It concludes that the low permeability soil is relatively difficult to dewater, but with the increase of the vacuum and the depth of the well, the amount of water pumped out of the low permeability soil increases. The vacuum negative pressure in the low permeability clay passes faster above the water level and the transmission speed is limited below the water level. High vacuum dewatering well has good applicability in low permeability soil layer.

• 出版日期2018
• 单位上海交通大学