土体压缩-回弹变形特性试验研究

针对地面沉降中土体变形问题,开展了不同土体(砂土、粉土和黏土)在不同状态下的压缩-回弹试验,结合相关土体变形机理的研究,对不同土体的压缩-回弹特性进行了研究。主要结论如下:砂土的压缩变形最为显著,其次为粉土,最后为黏土。砂土的变形呈现出初期变形小,后期变形大的特点。粉土和黏土则相反,两者的变形主要发生在前期。三种土体的变形均主要为不可逆变形,其中黏土的变形存在着明显的滞后性。砂土的变形主要来源为砂土结构的重塑,黏土则来自于结构的重塑和水分的重分布,粉土则与黏土相似。

Experimental Research on Compression-Rebound Deformation Characteristics of Soil

In view of soil deformation in land subsidence, compression-rebound tests of different soils (sand, silt and clay) in different states were carried out. Based on the study of soil deformation mechanism of relevant soils, the compression-rebound characteristics of different soils were studied. The main conclusions are as follows: the compression deformation of sand is the most significant, followed by silt, and finally clay. The deformation of sand is characterized by small initial deformation and large later deformation. On the contrary, the deformation of silt and clay mainly occurred in the early stage. The deformation of three kinds of soil is mainly irreversible, and the deformation of clay has obvious hysteresis. The deformation of sand mainly comes from the remolding of sand structure, clay comes from the remolding of structure and redistribution of water, and silt is similar to clay.