蜂窝状软粘土蠕变微观分析

Microscopic analysis of creepage of honeycomb soft clay

为预测软粘土的蠕变变形特征,建立蜂窝状软粘土微结构蠕变失稳力学模型.借助材料力学中对蜂窝结构的研究成果,从微观结构稳定性的角度研究影响软土变形和蠕变的主要几何-力学因素,分析软粘土微结构的变形失稳.研究表明:微结构的变形失稳与其受力状态、几何形状与尺寸等因素密切相关;当竖向应力一定时,随着围压的增大,蠕变屈曲破坏时间变长;当微结构受到扰动时,其蠕变失稳状态也会发生变化,围压的增加会使得微结构的蠕变失稳受到抑制.

In order to predict the creeping deformation character of soft clay, a mechanical model was de- veloped for microstruetural creepage instability of honeycomb soft clay. Using the research result of hon- eycomb texture given in mechanics of materials, the main geometric and mechanical factors having influ- ence on the deformation and creepage of the soft soil were investigated in view of microstructural stability, and the deformation instability of the mierostrueture of the soft clay was analyzed. The investigation showed that the mierostructural deformation instability was closely related to its stress state, geometry, and dimension. When the vertical stress was constant, the time-period of creeping buckling destruction would be increased with the confining pressure. When the microstructure was disturbed, its ereepage in- stability state might also be changed and the increase of confining pressure might make the microstructural creepage instability restrained.