泡沫轻质土渗透及吸失水性能试验研究

Experimental Study on Permeation and Water Absorption Properties of Foamed Light Soil

通过对湿重度分别为5.5 k N/m^(3)、6 k N/m^(3)的泡沫轻质土进行渗透及吸失水试验,研究了泡沫轻质土的孔隙状态、渗透系数及吸失水性能。试验结果表明:气泡混合轻质土是一种高孔隙率材料,其孔隙占比在75%以上,渗透系数约为10^(-5)~10^(-6)数量级,介于粉质粘土与粘土的渗透系数之间;受水浸泡后,泡沫轻质土容重最大增加约25%,失水后容重仍然有约9.5%增加量,在工程设计中应根据不同置换路基施工环境对设计容重按照1.0~1.25之间进行修正。

Trough the experiment of permeation and water absorption of the foamed light soil respectively with the wet weight 5.5 kN/m^(3) and 6 kN/m^(3),the porosity status,permeability coefficient and water absorption performance of the foamed lightweight soil are studied.The experimental results show that the bubble mixed light soil is a high-porosity material.Its pore ratio is more than 75%.The permeability coefficient is about 10^(-5)~10^(-6) order of magnitude,which is between the permeability coefficients of silty clay and clay.After water immersion,the bulk density of foamed light soil increases by a maximum of about 25%,and the bulk density after water loss still increases by about 9.5%.The design bulk density should be corrected between 1.0~1.25 in the engineering design according to the construction environment of different replaced subgrades.