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Volumetric behavior of saturated sands under poor drainage conditions

机译:在不良排水条件下饱和砂土的体积特性

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摘要

Permeability variations have been identified as a key factor in controlling slope failure locations in rainfall-induced landslides. In this research, failure behavior in limited drainage conditions was investigated. Tests were performed on saturated sands by means of a modified triaxial system that could mimic the effect of low-permeability barriers present in the field. The tests were conducted by increasing the pore water pressure at different rates to study the effects of the speed of pore water pressure rise on soil failure. The results revealed a dependence of soil volume changes on the rate of pore water pressure increase. In general, the results showed that volume change of granular soils, which are under shear and confined laterally by low-permeability materials, depends on the initial porosity and the pore water pressure rate. These results are particularly valid during the early stages of soil deformation that precede wholesale slope failure. Copyright 2006 by the American Geophysical Union.
机译:渗透率变化已被确定为控制降雨引起的滑坡中边坡破坏位置的关键因素。在这项研究中,研究了有限排水条件下的破坏行为。通过改良的三轴系统在饱和砂土上进行了测试,该系统可以模拟野外存在的低渗透屏障的影响。通过以不同的速率增加孔隙水压力进行试验,以研究孔隙水压力上升速度对土壤破坏的影响。结果表明土壤体积变化对孔隙水压力增加速率的依赖性。总的来说,结果表明,颗粒状土壤的体积变化受剪切作用并由低渗透性材料横向限制,这取决于初始孔隙度和孔隙水压力速率。这些结果在全面的边坡破坏之前的土壤变形的早期阶段特别有效。美国地球物理联盟版权所有2006。

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