城市环境下粘性土的热力学行为初探

Thermal Mechanics Conductivity of the Clayey Soil in Urban Environment

在广西大学东门附近取沉积相粘性土 ,用切土盘将土样切削成直径 39.1mm,高 80 mm的试样 ,并将橡皮膜套在试样外 ,分别在 +40℃ ,+6 0℃的环境中静置 4 8h ,12 0 h,16 8h后在相应的水温条件下完成三轴 (不固结不排水 )试验。试验结果表明 ,当温度由室温 (+18℃ )及 +40℃升至 +6 0℃时 ,原状土试样主应力差 (σ1 -σ3)有所增大 ;土体中不与大气连通的封闭气体对土的工程性质影响较大 ;同一温度作用下 ,时间越长 ,主应力差 (σ1 - σ3)越大。说明温度升高粘性土的强度提高 ,而且其作用时间越长 ,强度越高。

The clayey soil which dug from the rivers near the east door of the Guangxi University were cut into blocks which the diameter is 39.1 mm and the height is 80 mm.The blocks were put into the thin coatings and had the experiments in the relevant temperature of water after been put in the 40 degree, 60 degree for 48 h,120 h,168 h.It has been proved that when the temperature rises from room temperature (18℃) to 40℃,and from 40℃ to 60℃,the strength of the clayey soil will be improved,and the strength will be more strengthened with the role time grows.The air in the soil will affect the mechanical character of the soil mostly.Under the same temperature,the strength of the clayey soil will rise with the time.It shows the strength of the clayey soil will be strengthened with the rising of the temperature,and the more time the more strength.