【摘要】 利用SEM/EDX等测试手段,探讨了由灌溉引起的黄土湿陷发生机理。结果表明:黄土湿陷过程包括初始快速变形和后续迟缓变形2个阶段,这2个阶段的发生都与黄土的骨架颗粒——团粒有关。前者是由于黄土中非水稳性团粒遇水破坏所至,而后者是因为水的渗透造成黄土团粒主要胶结物碳酸钙的淋溶移动损失,从而导致失稳。黄土中松散结构或架空孔隙的存在是产生湿陷的重要条件,但不是湿陷发生的根本原因。更多还原

【Abstract】 The SEM/EDX methods are used in this article to discuss the mechanism of the loess collapsibility caused by irrigation and the result shows that there are two phases during the process of the loess collapsibility, i.e. the initial rapid deformation and the follow-up tardy deformation. The two phases correlate with the aggregates-framework grain of the loess. The first phase is caused by the destruction that occurs when non- watery stable aggregates encounter watery aggregates and the second is induced by the leaching loss and movement of the main cement the CaCO₃ of the loess aggregates caused by water infiltration. The loose structure or pore of the loess is an important condition in causing collapsibility, but not a fundamental reason for this process.更多还原