粗颗粒硫酸盐渍土溶—滤(陷)—变形稳定时长的影响因素分析

The Influence Factors Analysis of Coarse Particle Saline Soil Leaching Deformation Stability Timing

粗颗粒硫酸盐渍土遇水沉降是其主要的病害特征,其沉降变形速率的影响因素及其影响规律尚无明确结论。通过一系列室内模拟试验,实测了各影响因素单独作用下的溶陷变形时长,探讨了含盐量、荷载、孔隙比和干密度等因素对粗颗粒硫酸盐渍土沉降变形速率的影响。结果表明,含盐量是影响粗颗粒硫酸盐渍土沉降变形速率的主要因素,含盐量越高,沉降稳定的速率就越低,这除了盐分溶解需要时间外,也与盐分颗粒参与骨架作用,提高土体密实度有关,而荷载和孔隙比等因素对沉降速率的影响不明显。

Subsidence deformation was the main diseases of the foundation with coarse particles sulfate sa-line soil,but the speed of subsidence deformation was affected by which factors and the low were still dis-cussed. This study conducted a series of laboratory simulation tests,in order to discover the regularity offactors （salt-content／load／void ratio／dry density） impact on the speed of subsidence deformation. It isknown from the test that salt-content is the main factor that affects the speed of subsidence deformationof coarse particles sulfate saline soil;the more the salt-content, the lower the speed to reached deformationstability. It is not only related to the time consumed by salt dissolution, but also related to salt particlesthat take part in the role of the skeleton. The density of the soil was increased because of salt particles loca-ted in the voids among soil particles. The impact of loads and void ratio and other factors on speed of sub-sidence deformation was not significant.