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首页> 外文期刊>Landslides >Residual strength and creep behaviour on the slip surface of specimens of a landslide in marine origin clay shales: influence of pore fluid composition
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Residual strength and creep behaviour on the slip surface of specimens of a landslide in marine origin clay shales: influence of pore fluid composition

机译：海洋起源的泥页岩滑坡标本的滑动表面上的残余强度和蠕变行为：孔隙流体成分的影响

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摘要

Active landslides in clay shales are widespread in Mediterranean countries. One of their characteristics is that the mobilized shear strength corresponds to the residual strength. The residual friction angle of clays depends on pore fluid composition which, in formations of marine origin, could have changed after emersion from the sea because of a number of processes, e.g., contact with rain or fresh water. This study aims at evaluating the influence of pore fluid composition and of its changes on the behaviour of Costa della Gaveta landslide, used as a case study. The natural pore fluid composition was analysed; then, the influence of such composition on the residual strength, and the effects of its variation on the shear creep behaviour were investigated. The paper shows that the natural pore fluid is a composite salt solution with variable concentration. It exhibits characteristics close to those of seawater at about 30m depth, whereas it is very dilute close to the ground surface. Salt solutions at various concentrations and distilled water were thus used to simulate in the laboratory tests the effects of the different natural pore solutions. The results show that the residual friction angle varies significantly within the field concentration range. Moreover, exposure to distilled water causes a noticeable decrease in the residual strength during tests under constant shear displacement rate. Consistently, under constant driving shear stresses, time dependent displacements are observed, evolving with primary, secondary and tertiary creep phases, characterized, respectively, by decreasing, constant and increasing displacement rates.
机译：粘土页岩中活跃的滑坡在地中海国家中很普遍。它们的特征之一是动员的剪切强度对应于残余强度。粘土的残余摩擦角取决于孔隙流体的组成，在海洋起源的地层中，由于许多过程（例如与雨水或淡水接触），从海洋中出来后可能会发生变化。这项研究旨在评估孔隙流体组成及其变化对哥斯达黎加加维塔滑坡行为的影响，以此为案例研究。分析了天然孔隙流体的组成;然后研究了这种成分对残余强度的影响，以及其变化对剪切蠕变行为的影响。本文表明，天然孔隙流体是一种浓度可变的复合盐溶液。它的特性与深度约30m的海水相近，而在地表附近却非常稀。因此，在实验室测试中使用了各种浓度的盐溶液和蒸馏水来模拟不同天然孔隙溶液的效果。结果表明，残余摩擦角在磁场浓度范围内变化很大。此外，在恒定剪切位移速率下进行测试期间，暴露于蒸馏水中会导致残余强度显着降低。一致地，在恒定的驱动剪切应力下，观察到随时间变化的位移，随着初级，次级和第三级蠕变阶段的发展，分别以减小，恒定和增加的位移速率为特征。

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