The Capillary Water's Movement Model In Loess And Key Parameter Test

Capillary action is a common phenomenon in life,and capillary force is also widely used in medicine,botany,micro-motor systems and other fields.However,for geotechnical engineering,the phenomenon of capillary water rise caused by capillary action will affect the water content of the foundation of the project,the soil structure and the strength of the foundation,which will cause harm to the people's safe life.Therefore,in order to provide a method for project disaster prediction,in this paper,the force model of capillary water rise is studied.Through theoretical analysis and experimental research,the movement path of capillary water in soil pores is found,and the calculation formula for the prediction of capillary water rise height is proposed.The main research results are as follows:?1?Analyze the classic capillary water stress model of the Jurin criterion,raise its problems and improve it.When the capillary water is in a static state,in addition to the surface tension and gravity,it should also be subjected to a viscous frictional resistance of the wall to the liquid.?2?The saturated soil sample was tested by a magnetic resonance imaging analyzer to obtain the pore distribution of the soil sample.And the T₂ spectral distribution map can be used to analyze the change in saturation in the sample.In this test,the pore size of the soil sample in the range of 1?4?m is the largest and evenly distributed.?3?Using a centrifugal-magnetic resonance imaging analyzer to perform centrifugal analysis on the sample,a method for determining the adhesion resistance between the pore wall and the capillary liquid was proposed.?4?According to the experimental results,a formula suitable for calculating the rising height of capillary water in loess is proposed,and the calculation and selection method of the viscous frictional resistance and pore diameter of the capillary wall to water are given.