福州软土次固结变形特性试验研究

Experimental study on secondary consolidation properties of Fuzhou soft soils

对福州地区软土进行一系列的固结试验,探讨固结压力、加荷比、超载预压及超压历时对软土次固结的影响。研究结果表明：随加荷比的增大或减小,次固结系数Ca相应增大或减小;次固结系数随固结压力增大而先增大后减小,当试样处于超固结状态时,次固结系数随固结压力增大而增大;次固结系数的减小不仅与超固结比有关,而且与超压历时有关。此外,福州地区软土的次固结系数Ca与压缩指数Cc之比为0.029-0.052。

Based on a series of consolidation tests for undisturbed samples in Fuzhou, the influence of consolidation pressure, load ratios, overload pre-pressure and overload pre-pressure duration on secondary consolidation properties was studied. The results show that the secondary consolidation coefficient Ca correspondingly increases or decreases with the increase or decrease of the loading ratio. Along with the increase of consolidation pressure, the secondary consolidation coefficient for normally consolidated soil increases at first and then decreases, but it remains increasing for over-consolidated soft soils. The decrease of secondary consolidation coefficient is related not only to the over-consolidation ratio but also to overload pre-pressure duration. For Fuzhou soft soil, the ratio of secondary consolidation coefficient Ca and compression index Cc is 0.029 to 0.052.