Energy evolution mechanism of red Pisha-sandstone cement soil under uniaxial compression
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摘要: 砒砂岩水泥土受荷变形的过程中伴随着能量的积聚和耗散，在能量的驱动下致使水泥土变形破坏。为了探寻单轴加载过程中砒砂岩水泥土的能量演化规律，根据不同养护龄期和不同水泥掺量下砒砂岩水泥土在变形破坏过程中总能量、峰值点总能量、峰值点弹性应变能、峰值点耗散能的演化规律，从能量的角度分析了龄期和水泥掺量对砒砂岩水泥土的影响。研究表明：能量耗散与砒砂岩水泥土的强度衰减密切相关，试样受荷过程中的损伤情况可以用耗散能的多少来反映，砒砂岩水泥土单轴受压破坏的整个过程中，破坏总能量和耗散能均呈“S”状增长，弹性应变能呈先增加后减小的“凸”状趋势发展；随水泥掺量的增加有效能比也随之增加，不同龄期下各水泥掺量的砒砂岩水泥土都是以吸收弹性能为主，而峰值点应变能可以代表水泥土试样的储能极限，因此有效能比、峰值点应变能能够很好地反映砒砂岩水泥土抵抗破坏的能力。通过利用能量分析原理对砒砂岩水泥土的变形过程进行研究，可以打破以往仅仅利用传统的应力-应变强度来描述其破坏特征的思路，为该类材料的受荷变形分析提供了新的方法和思路。Abstract: During the process of deformation of the Pisha-sandstone cement soil under load, energy is accumulated and dissipated, and the cement soil is deformed and destroyed under the driving of energy. In order to explore the law of energy evolution of the Pisha-sandstone cement soil under uniaxial loading, according to the evolution law of total energy, peak point total energy, peak point elastic strain energy and peak point dissipative energy of Pisha-sandstone cement soil in the process of deformation and failure under different curing ages and different cement content, this paper analyzes the influence of age and cement content on the Pisha-sandstone cement soil from the angle of energy influence. The results show that the energy dissipation is closely related to the strength attenuation of the Pisha-sandstone cement soil. The damage of the specimen in the process of loading can be reflected by the amount of dissipated energy. As the cement content increases, the effective energy ratio also increases. At different ages, the Pisha-sandstone cement soil with different cement content mainly absorbs elastic energy, and the peak strain energy can represent the storage energy limit of cement soil sample. Therefore, the effective energy ratio and peak strain energy can well reflect the ability of the Pisha-sandstone cement soil to resist failure. By using the principle of energy analysis to study the deformation process of the sandstone cement soil, it can break the previous idea of using only the traditional stress-strain strength to describe its failure characteristics, and provide new methods and ideas for the analysis of this type of material.
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Key words:
- Pisha-sandstone /
- cement soil /
- uniaxial compression /
- energy mechanism /
- dissipative energy
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