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Relationships between soil fabric and suction cycles in compacted swelling soils

机译：压实膨胀土中土壤结构与吸力循环的关系

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This study presents the influence of suction variation on the fabric of two clayey soils, using the mercury intrusion porosimetry (MIP) technique on dense and loose remoulded samples. The experimental study focussed on the evolution of the compacted soil fabric, including the macropores, mesopores, and micropores under various hydromechanical conditions. The variation of void ratio of both samples was initially studied during a single wetting and drying cycle. The experimental results confirm the existence of a suction limit between the meso- and macropores (s_(m/M)) as well as the soil "shrinkage limit" suction (s_(SL)). The suction increase between (s_(m/M)) and (s_(SL)) completely eliminated the macropores and produced mesostructural rearrangement. The higher suctions modified the meso- and micropores. The measured soil water retention curves (SWRC) of these two soils compared with the MIP calculations showed a more reasonable agreement for the dense soil with a fewer macropores. Moreover, several wetting and drying cycles were applied to the remoulded samples. The suction cycles produced a cumulative swelling strain for the dense soil while a shrinkage accumulation was observed for the loose samples. The wetting/drying cycles induced an equilibrium stage in which the samples behaved in an elastic way. The analysis of the soil fabric at this elastic equilibrium stage showed that the suction cycles created significant macrostructural modifications and reorganization of the mesopores towards smaller sizes.
机译：这项研究使用汞侵入孔隙率法（MIP）技术对稠密和疏松的重塑样品进行了研究，研究了吸力变化对两种黏性土壤织物的影响。实验研究的重点是在各种流体力学条件下压实土壤织物的演化，包括大孔，中孔和微孔。最初在单个润湿和干燥循环中研究了两个样品的空隙率的变化。实验结果证实了中孔和大孔之间的吸力极限（s_（m / M））以及土壤“收缩极限”吸力（s_（SL））的存在。 （s_（m / M））和（s_（SL））之间的吸力增加完全消除了大孔并产生了介观的结构重排。较高的吸力改变了中孔和微孔。与MIP计算相比，这两种土壤的测得的土壤保水曲线（SWRC）表明，对于大孔较少的致密土壤，其更合理的一致性。此外，将几个润湿和干燥循环应用于重塑样品。吸力循环对致密土壤产生累积的膨胀应变，而对于松散的样品则观察到收缩累积。润湿/干燥循环引起平衡阶段，在该阶段样品以弹性方式表现。在此弹性平衡阶段对土壤织物的分析表明，吸力循环产生了显着的宏观结构改变，并使中孔朝着较小的方向重组。

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