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剪胀性砂土流滑现象与自然排水条件下孔压重分布导致的局部土体强制吸水有关,须放在具体边值问题中来阐释。同时考虑孔隙水压力扩散、转移以及吸水剪切下饱和砂土应力应变行为的流动变形简化分析方法,研究了相对不透水层的位置、地基土体的渗透系数对边坡地震后延迟变形的影响特征和规律。地震后延迟侧向变形总是集中发生在孔隙水渗流被阻滞的界面,界面处砂土强制吸水量越大,发生的侧向位移量就越大;设置穿透相对不透水层的排水通道可有效减小边坡的侧向变形。地震后侧向流动变形的发展过程取决于孔隙水扩散、转移的速度,是由具体边值问题中土体的渗透系数决定的,饱和土体的黏滞特性对于变形发展过程的影响可以忽略。
The phenomenon of slippery sand flow-slip is related to the forced suction of local soil caused by pore-pressure redistribution under natural drainage conditions, and must be interpreted in terms of specific boundary value problems. Simultaneously, a simplified method of flow deformation analysis was taken into account for the stress-strain behavior of saturated sands under pore water pressure diffusion, transfer and suction shear. The effects of relative impermeable layers’ permeability and the permeability of foundation soil on the post-earthquake delayed deformation were investigated Features and laws. After the earthquake, the delayed lateral deformation always occurs in the interface where the pore water seepage is blocked. The greater the amount of forced water absorption at the interface, the greater the lateral displacement occurs. A drainage channel that penetrates the relatively impermeable layer is provided It can effectively reduce the lateral deformation of the slope. The development of lateral flow deformation after an earthquake depends on the rate of pore water diffusion and transfer, which is determined by the permeability coefficient of the soil in a particular boundary value problem. The viscous behavior of saturated soil has negligible effect on the deformation and development process.