粘性土开裂的细观角度分析

为了揭示土体在自然条件下因蒸发失水而开裂的原因,采用颗粒简化模型,将土体开裂看做是无数土颗粒的运动的结果,运动依然符合牛顿运动定律。不考虑其他因素引起基质吸力的组成部分,只考虑毛细水作用对基质吸力的贡献;并从土颗粒、水、气、水膜四相之间相互作用的细观角度,将土颗粒作为研究对象进行受力分析,找到土体开裂的内在动力,从细观角度阐明土体开裂的原因。结果表明土体在含水率相差较大的地方最先容易产生开裂;并分析低饱和度黏性土坚硬的原因。

Analysis of cohesive soil cracking from the microscopic point of view

In order to investigate the reasons for cracking of the soil under natural conditions, a simplified model of soil particles is used to analyse soil cracking. Cracking of cohesive soil is the result of the movement of soil particles, the movement is still in line with Newton"s laws of motion. Only considering that the capillary suction caused part of the matric suction and analyzing the applied force of the soil particles baced on the interaction between soil particleswater,gas, and water film, then it was found that the underlying causes and inner motivation of soil cracking. The results showed that the place with largely different water content is prone to crack.Then,it tells that why low-saturation clay is hard.