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现场和试验观测表明,高应力下砂土的蠕变过程伴随着颗粒破碎现象。通过开展砂土的一维蠕变试验发现,试样的颗粒破碎量随时间增加而增加,且蠕变速率与颗粒破碎速率成正比。在此基础上,分析了蠕变过程中能量转化关系,利用表面物理学和分形几何学理论,得到了一维蠕变条件下颗粒破碎速率与宏观蠕变速率之间的关系表达式。研究结果表明,高应力一维蠕变条件下颗粒材料的宏观蠕变速率与颗粒破碎速率成正比。最后,对该研究采用的等效化方法进行了讨论。
Field and experimental observations show that creep of sand under high stress is accompanied by particle breakage. By carrying out one-dimensional creep test of sand, it is found that the amount of particle crushing of the sample increases with time, and the creep rate is in direct proportion to the rate of particle crushing. On the basis of this, the relation of energy transformation in creep process is analyzed. The expression of the relationship between the particle crushing rate and the macro creep rate under one-dimensional creep condition is obtained by using surface physics and fractal geometry theory. The results show that the macroscopic creep rate of granular materials under high stress and one-dimensional creep condition is proportional to the rate of particle breaking. Finally, the equivalent method used in this study is discussed.