Experimental Study on Influence of Water Infiltration on

 利用自制土壤内部压力测量装置对水分入渗过程中土壤内部的综合压力进行了测量,分析了水分入渗过程中不同土层的土壤内部压力的变化特征以及不同容重土壤的内部压力的变化特征。结果表明:同一容重下不同土层的土壤,在灌水初期0～20min左右,水分入渗对土壤内部扰动的综合压力随着土层深度的加深而减小;在360～420min内综合压力值随土层深度的加深而增大。不同容重下同一土层的土壤,水分入渗对土壤内部扰动的综合压力在表层土0～15cm土层,压力值随着容重的增大而增大;15～30cm和30～45cm土层在测定时间0～90min内,容重越大压力值越小,90min后压力值随着容重的增加呈递增的趋势。试验结果同时表明同一时段内,容重越大,压力值的变化幅度越小即压力差越小In this study，soil internal overall pressures measurement was measured when water infiltration by using ahomemade measuring device of soil internal pressure，which made analysis of soil internal pressure variation characteristicsof different layers and different bulk density in water infiltration process． The results show that in initial stages of irrigationof about 0 － 20min， the overall pressure of soil internal turbulence decreases with soil depth on the influence of soil waterinfiltration in different layers of same bulk density． And in 360 － 420min， the overall pressure increases with the depth ofsoil． As for the different bulk density of the same soil layer， in top soil 0 － 15cm， the overall pressure of soil internal turbulenceincreases with the bulk density increased on the influence of soil water infiltration． And in the layers of 15 － 30cmand 30 － 45cm， the pressure decreases with the bulk density increased in initial stages of irrigation of 0 － 90min，whichincreases with the bulk density increased at a later time． The results also show that in the same period， the greater thebulk density is， the smaller the magnitude of variation in pressure is，which is to say the pressure difference is smaller