孔隙结构对黏土持水性及抗剪强度的影响

In order to study the influence of bimodal pore structure on the mechanical properties of unsaturated soil, two typical bimodal pore structure clays in Nanning and Guilin in Guangxi were selected as target materials and the shear strength characteristics under different saturation conditions were analyzed. The influence mechanism of pore water distribution status on the strength of two kinds of soils with bimodal pore structure was explored by filter paper method and nuclear magnetic resonance (NMR) technique. The results show that the T2 distribution curves of the two samples have bimodal structure under saturated condition. Moreover, on the whole, the water retention characteristics of soil samples show bimodal soil-water characteristic curve. The stress-displacement relationship of the two kinds of soil is similar, and the shear strength is closely related to saturation, and the change trend of soil sample cohesion changes when the saturation is 40%, while the internal friction angle reaches the minimum at a saturation of 80%.