流体释出过程中饱和土体沉降变形特征

研究土体沉降变形特征对工程项目具有现实意义.通过三组室内对比实验,分别得出厚度30 cm、粒径0.150 mm的砂土,厚度15 cm、粒径小于0.075 mm的黏土,厚度30 cm、粒径小于0.075 mm的黏土,在同一压力和不同压力下发生的一次、二次渗流变形参数,通过百分表观测所得的沉降数据反映土体变形规律,将三组变形进行对比,结果表明：在土层厚度同为30 cm,流体压力高度同为150 cm时,砂土层沉降量为0.193 mm,沉降稳定时间25 min,黏土层沉降为6.529 mm,沉降稳定时间2000 min,可见,砂性土释出流体沉降变形量和沉降完全所需的时间,远远小于黏性土;同一土性,厚度越大,沉降变形量越大;同一条件下,二次沉降量小于一次沉降量.

Deformation characteristics study of water releasing from saturated soils

This paper is based on the recognition that the study of soil settlement is of practical sig- nificance for the project and introduces the use of three groups of indoor experiments which produce seep- age deformation parameters which occur once and twice when the same pressure and different pressures are applied on sand with the thickness 30 cm and particle diameter of 0. 150 mm, clay with the thickness 15 cm and particle diameter of less than O. 075 ram, and clay with the thickness 30 cm and particle diam- eter of less than 0.075 mm. The paper goes further into the reflection of the law underlying the deforma- tion of the soil by observing the settlement from dial indicator and the contrast of the deformation of the three groups. Results show that the occurrence of soil thickness of 30 cm and fluid pressure altitude of 150 cm mean the settlement of sand layer of 0. 193 mm, the settlement stability time of 25 min, the clay layer settlement of 6. 529 mm, and the settlement stability time of 2 000 min, suggesting much less time for sandy soil subsidence and deformation process than for clay one; the thicker soil means the larger de- formation; and with the same condition, settlement amount is less for secondary than for the first one.