Secondary consolidation of soft soils
Secondary consolidation of soft soils
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发表时间：
2003
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通讯作者：
Y. Zong
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作者：
Y. Zong
传统计算软土二次固结的方法不能反映荷载的影响。它实际上只适用于通常固结的土。然而，在工程问题中，我们经常遇到过度胶结土。试验结果表明，超胶结土的二次压缩与荷载有明显的关系。本文提出了绝对时间坐标系和相对时间坐标系的概念，并建议在二次压缩计算中使用绝对时间坐标系。在绝对时间坐标系下，以正常固结土开始加载为时间原点。基于Bjerrum的等时曲线理论和绝对时间坐标系，提出了一种计算二次压缩的新方法。通过等时动态动态曲线，建立时间与负载之间的关系。二次压缩不仅随时间变化，而且随载荷变化。它既可用于正常固结土，也可用于过度固结土。提出的二次固结模型可以解释许多试验现象和工程问题，如预压和反复加卸载对二次固结的影响
The conventional method to compute secondary consolidation of soft soils does not reflect the influence of load.It is only applicable to the normally consolidated soils actually.However,we often deal with overconsolidated soil in engineering problems.The tests performed by the authors show that secondary compression obviously relates to load on the overconsolidated soil.In this paper,the concept of absolute and relative time coordinate systems is proposed,and it is suggested to use the absolute time coordinate system in computation of secondary compression.In absolute time coordinate system, the beginning of loading on normally consolidated soil is taken as the origin of time.Based on Bjerrum's theory of equitime e-lgp curve and the absolute time coordinate system,a new method to compute secondary compression is developed.Through the equitime e-lgp curve,the relationship between time and load is set up.Then the secondary compression varies not only with time,but also with load.It can be used for both normally consolidated soil and overconsolidated soil.The proposed model of secondary consolidation can explain many tested phenomenon and engineering problems,such as influences of preloading and repeat of loading and unloading on secondary consolidation.