不同土质孔隙结构特点及其毛细水上升规律分析

根据室内竖管毛细水上升高度试验观测不同土质毛细水上升高度,分析3种典型土质孔隙结构特点及其毛细水上升高度随时间变化的规律。粉土、砂土和黏土毛细水上升高度分别为116,47,44 cm;上升速度峰值分别为12,95,95 cm/h;平均上升速度分别为0.32,0.13,0.08 cm/h。试验结果表明:粉土毛细水上升高度高、上升速度快、上升持续时间长,砂土毛细水上升高度低、上升速度最快、上升持续时间短,黏土毛细水上升高度低、上升速度慢、上升持续时间长;毛细水上升高度、上升速度反映了土颗粒形成的孔隙结构特点,上升高度高毛细通道细且畅通、上升高度低毛细通道粗或阻塞。

Pore structure characteristics of different soils and analysis of capillary water rising law

Based on laboratory vertical capillary water elevation test,the elevation of capillary water in different soils was observed,and the pore structure characteristics of three typical soils and the law of capillary water elevation varying with time were analyzed.The capillary water rising heights of silt,sand and clay were 116,47 and 44 cm,the peak rising speeds were 12,95 and 95 cm/h,and the average rising speeds were 0.32,0.13 and 0.08 cm/h,respectively.The test results showed that the silt capillary water has high rising height,fast rising speed and long rising duration,the sand capillary water has low rising height,the fastest rising speed and short rising duration,and the clay capillary water has low rising height,slow rising speed and long rising duration.The rising height and rising speed of capillary water reflect the pore structure characteristics of soil particles,and the rising height was high.The capillary channel was thin and smooth,and the rising height was low and the capillary channel was thick or blocked.