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针对较少研究滑带土强度指标与滑带土演化特征的相关性及不同演化阶段强度参数变化规律的问题,以黄土坡滑坡临江Ⅰ崩滑体为例,从滑带土的演化阶段划分、粒度成分、矿物成分、微观结构等方面分析了滑带土的演化特征,并以滑带土的演化特征为基础,结合粒度分形理论反演出了不同演化阶段滑带土粒度组成,配制出了不同演化阶段的人工滑带土用于强度试验。试验结果表明,内摩擦角随砂粒含量的减少呈对数模式变化,先趋于稳定后迅速减小;粘聚力随粘粒含量增加呈S型增长模式,先缓慢增长、再迅速增长、后趋于稳定;原因在于滑带土由骨架结构向镶嵌结构转变,从而使内摩擦角及粘聚力的产生机理发生变化。
In order to solve the problem that the correlation between the strength index of sliding zone soil and the evolution characteristics of sliding zone soil and the changing law of strength parameters in different evolution stages are relatively few, taking the landslide in Linjiang section of Huangtupu landslide as an example, , Particle size composition, mineral composition, microstructure and so on. Based on the evolution characteristics of sliding zone soil and particle size fractal theory, the particle size composition of the sliding zone soil in different evolution stages was inverted and the composition of Artificial slip-soil in different stages of evolution is used for strength testing. The experimental results show that the internal friction angle changes logarithmically with the decrease of the sand content, decreases rapidly first and then tends to be stable. The cohesion increases slowly with the increase of the clay content, and then grows slowly and then increases rapidly Tends to be stable; the reason is that the slipband soil changes from the skeleton structure to the mosaic structure, so that the mechanism of the internal friction angle and cohesion changes.