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高水平应力作用下,砂土等颗粒材料中的颗粒将发生破碎。一方面,颗粒破碎导致材料的颗粒分布曲线发生变化:材料中的粗颗粒含量减少,细颗粒含量增加;另一方面,颗粒的破碎引起了能量的转化。由能量守恒定律,作用过程中外力所做的功一部分由粒间摩擦力转化成热能,而另一部分则消耗到颗粒破碎过程中。利用表面物理学理论,颗粒破碎能可以表达为颗粒表面张力在颗粒破碎中所作的功。由此得到了一维压缩条件下颗粒破碎量与宏观压缩量之间的关系表达式。为了验证得到的关系式,开展了砂土的一维压缩试验,并进行了试验数据的整理分析。研究结果表明,所得关系表达式能较好地反映高水平应力作用下颗粒破碎对颗粒材料压缩性的影响。
High level of stress, sand and other particulate materials in the particles will occur broken. On the one hand, particle crushing leads to a change in the particle distribution curve of the material: coarse particles in the material decrease, fine particles increase; on the other hand, particle crushing causes energy conversion. By the law of conservation of energy, part of the work done by the external forces during the action is converted into thermal energy by the friction between the grains, while the other part is consumed during the particle crushing process. Using surface physics theory, the particle crushing energy can be expressed as the work done by particle surface tension in the particle crushing. The relationship between the amount of crushing and the amount of macroscopic compression under one-dimensional compression is obtained. In order to verify the relationship obtained, a one-dimensional compression test of sand was carried out, and the test data were analyzed. The results show that the obtained relational expression can better reflect the effect of particle breakage on the compressibility of granular materials under high horizontal stress.