红层软岩遇水崩解特性试验及其界面模型

发布时间：2018-06-10 19:07

  本文选题：红层软岩 + 崩解特性　； 参考：《岩土力学》2017年11期

【摘要】：红层软岩遇水崩解是引发工程灾害的重要原因。红层软岩遇水崩解缘于水作用下软岩细观成分组构的变化,但目前软岩崩解特性定量表征研究多根据宏观现象,所得到的崩解模型难以对软岩崩解的细观过程进行研究。根据室内软岩静态崩解和软岩碎片浸水试验以及不同浸泡阶段的软岩的成分组构扫描电镜观察试验,揭示了水-软岩界面的细观演化规律:红层软岩的崩解机制缘于软岩碎片间泥质填充区中水-岩界面上的黏土颗粒在水作用下发生水化、扩散和流失致使泥质胶结带缩减,从而引起碎片间凝聚力下降;静水作用下软岩碎片间的凝聚力随时间呈幂函数衰减。在此基础上,利用界面与胶体化学、断裂力学理论,定量表征了软岩中水化黏土颗粒的流失以及软岩碎片间的模式Ⅱ型开裂,建立了软岩遇水崩解的界面模型,进而定量表征了软岩遇水崩解过程。通过对比计算,利用上述所建模型计算的软岩碎片剥落时间和试验观察的软岩碎片剥落时间相近,从而验证了模型的合理性。
[Abstract]:The collapse of red bed soft rock is an important cause of engineering disaster. The breakup of soft rock in red bed is caused by the change of meso-compositional fabric of soft rock under the action of water. However, the quantitative characterization of the disintegration characteristics of soft rock is mostly based on macroscopic phenomena, and it is difficult to study the meso-process of soft rock disintegration by the obtained disintegration model. According to the static disintegration of soft rock in laboratory and the soaking test of soft rock fragments, the composition of soft rock in different soaking stages was observed by scanning electron microscope (SEM). The microcosmic evolution of the water-soft rock interface is revealed. The collapse mechanism of the soft rock in the red bed is due to the hydration of clay particles at the water-rock interface in the muddy fill area between the soft rock fragments, the diffusion and loss of the clay cementation zone, and the reduction of the muddy cementation zone. The cohesion of soft rock fragments decreases with time, and the cohesion of soft rock fragments decreases with time. On this basis, the loss of hydrated clay particles in soft rock and mode 鈪，

本文编号：2004286