In fluid-saturated granular materials, the physicochemical interaction between pore-fluids and grain minerals alters packing conditions, which in turn leads to stress change, deformation and, in extreme cases, even collapse. Chemical weathering, either naturally occurring or induced by human activities, is among such processes. This paper presents an experimental study illustrating the major effects of chemical weathering on the deformation and stress state of granular materials, emphasising particulate systems entirely made by highly soluble carbonate grains. Laboratory experiments are conducted by subjecting granular assemblies to acidic environments under oedometric conditions. The reaction rate is controlled by regulating various testing parameters, such as acid concentration and pore fluid flow rate. Experiments revealed that the lateral earth pressure steadily reduces in some cases, while others exhibit non-monotonic evolution. From a macroscopic standpoint, the rate of the chemical reaction was critical to determine the emergence of either of these trends. Such findings are relevant for any particulate system in which the stress conditions are controlled by multi-physical processes proceeding at different rates, such as waste products within bioreactors, gouge materials within faults and natural deposits subjected to the injection/extraction of reactive fluids.

中文翻译：

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不同溶解速率砂土压力系数的演变

在流体饱和的颗粒材料中，孔隙流体和颗粒矿物之间的物理化学相互作用会改变堆积条件，进而导致应力变化、变形，在极端情况下甚至会坍塌。化学风化，无论是自然发生的还是由人类活动引起的，都属于此类过程。本文介绍了一项实验研究，说​​明了化学风化对颗粒材料变形和应力状态的主要影响，强调了完全由高度可溶性碳酸盐颗粒构成的颗粒系统。实验室实验是通过在 oedometric 条件下将粒状组件置于酸性环境中进行的。通过调节酸浓度和孔隙流体流速等各种测试参数来控制反应速率。实验表明，侧向土压力在某些情况下稳步降低，而另一些则表现出非单调演化。从宏观的角度来看，化学反应的速率对于确定其中任何一种趋势的出现至关重要。这些发现与任何颗粒系统相关，其中应力条件由以不同速率进行的多物理过程控制，例如生物反应器内的废物、断层内的凿孔材料和经历反应流体注入/提取的天然沉积物。