Compressive stress induced by desiccation shrinkage in clayey soils

IF 5.3 2区 地球科学 Q2 CHEMISTRY, PHYSICAL
Hao Zeng , Chao-Sheng Tang , Yu-Jun Cui , Abdallah Najdi
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Abstract

The volumetric shrinkage behavior of clayey soils under drying has been well examined, whereas the resulting internal mechanical response remains understudied. This work measured the compressive stress induced by desiccation shrinkage in two types of clayey soils along vertical and lateral directions using a flexible pressure sensor embedded in the slurry samples. The stress evolution was investigated in relation to mineralogical compositions, hydromechanical behavior, microstructures and drying conditions. The results highlighted that the compressive stress developed as a consequence of desiccation shrinkage, particularly in clayey soils with a high montmorillonite content. The development of suction beyond the air entry value (AEV) contributed to a notable increase in the compressive stress. This contribution was enhanced in the vertical direction owing to the face-to-face contact between clay platelets. A decrease in environmental relative humidity caused the compressive stress to initiate at lower water content, yet limited the contribution of suction. Moreover, non-uniform lateral desiccation shrinkage along the soil profile activated contact shear effects among clay platelets, hindering the development of lateral compressive stress. With further drying, the suction contribution to the compressive stress decreased since the increasing formation of air-filled pores disrupted the chains of stress transmission. When the shrinkage limit was reached, the compressive stress stabilized as the clay platelets interlocked under high suction. Furthermore, the directly measurable compressive stress can serve as a mechanical reference for characterizing the volumetric shrinkage behavior of drying clayey soils.
粘性土干燥收缩引起的压应力
粘土在干燥条件下的体积收缩特性已经得到了很好的研究,而由此产生的内部力学响应仍有待研究。这项工作测量了两种类型的粘土干燥收缩引起的压应力沿垂直和横向方向使用柔性压力传感器嵌入泥浆样品。研究了应力演化与矿物组成、流体力学行为、微观结构和干燥条件的关系。结果强调,压缩应力的发展是由于干燥收缩,特别是在粘土与高蒙脱土含量。超过空气入口值(AEV)的吸力的发展导致压应力的显著增加。由于粘土薄片之间的面对面接触,这种贡献在垂直方向上得到了增强。环境相对湿度的降低使压缩应力在较低含水量时开始,但限制了吸力的贡献。此外,沿土体剖面不均匀的侧向干燥收缩激活了粘土薄片之间的接触剪切效应,阻碍了侧向压应力的发展。随着进一步干燥,吸力对压应力的贡献减小,因为充气孔的增加破坏了应力传递链。当达到收缩极限时,在高吸力作用下,粘土片的压应力趋于稳定。此外,可直接测量的压应力可作为表征干燥粘土体积收缩特性的力学参考。
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来源期刊
Applied Clay Science
Applied Clay Science 地学-矿物学
CiteScore
10.30
自引率
10.70%
发文量
289
审稿时长
39 days
期刊介绍: Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...
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