石灰土填料抗剪强度试验研究

模拟石灰土在工程中的应力状态,利用静三轴CU试验研究了石灰土的应力-应变关系及强度特性,探讨了在不同石灰掺入比的情况下石灰土抗剪强度指标的变化规律,分析了素土和石灰土的变形破坏模式;采用扫描电镜(SEM)照片及能谱分析(EDS)研究了掺灰比不同的石灰改良土的微观结构和矿物构成,并结合三轴实验结果,从微观结构上研究了石灰...

Experimental Study on Shear Strength of Fillings Treated with Lime

The Simulating state of stress in projects,laboratory CU tri-axial tests were carried out in order to understand the stress-strain relationship and strength property of fillings treated with lime.The change of shear strength indexes of lime-reinforced soils with lime ratio in the soil samples was investigated.The failure modes of reinforced and unreinforced fillings were discussed.The structure and components of reinforced and unreinforced fillings are also microscopically analyzed by electron microscopy(SEM) and energy spectrum(EDS).Based on the laboratory test results and microstructure analysis,the reinforcement mechanism of fillings treated with lime was discussed.The laboratory test results show that: the addition of lime can improve effectively the mechanical properties of fillings.The shear strength of lime soils increases with increasing of added lime dosage.When lime ratio is greater than 4%,the strength and the capacity for resisting the deformation of lime-reinforced soils remarkably increase.Derivative cohesion principle suitable for geotextile-reinforced soils can be used to interpret the reinforcement mechanism of fillings treated with lime.The research results are of importance for understanding the strengthening mechanism and determining suitable lime ratio during construction.