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

摘要:

通过对湿重度分别为5.5kN/m3、6kN/m3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。

Abstract:

Trough the experiment of permeation and water absorption of the foamed light soil respectively with the wet weight 5.5 kN/m3 and 6 kN/m3, 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.