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通过人工土和天然软土的快剪试验,从微观角度研究矿物成分对细颗粒粘土强度特性的影响.研究表明:单一矿物成分试样的强度特性与矿物颗粒的表面特性与结合水性质有关.粘土矿物颗粒具有较大的比表面积、阳离子交换当量,颗粒表面形成强烈微电场而产生较厚的粘滞性结合水膜,使颗粒间粘聚力增强,故表现出较高的粘聚力,而粒间容易错动而形成润滑摩擦,表现出较低的抗剪强度与内摩擦角;混合矿物成分人工土和天然软土试样的强度特性是不同类型矿物颗粒间摩擦、胶结粘聚和结合水性质等微观因素的综合体现,只要某种细颗粒粘土矿物含量超过一定限值,混合土试样的强度特性便由该细颗粒粘土矿物决定.
Through the quick shear test of artificial soil and natural soft soil, the effect of mineral composition on the strength characteristics of fine granular clay was studied from a microscopic point of view. The results show that the strength characteristics of the single mineral composition sample are related to the surface properties of mineral particles and the properties of bound water. Clay mineral particles have a large specific surface area, cation exchange equivalent, the formation of a strong micro-electric field on the surface of the particles to produce a thick viscous water film, the cohesion between the particles increased, it showed higher cohesion, While the intergranular is easy to slip and form the lubricating friction, which shows lower shear strength and internal friction angle. The strength characteristics of the mixed mineral composition artificial soil and the natural soft soil sample are the friction, congregation and cohesion of different types of mineral particles Combined with the microscopic factors such as water properties, the strength characteristics of the mixed soil samples are determined by the fine-grained clay minerals as long as the content of certain fine-grained clay minerals exceeds a certain limit.