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本文利用计算机对等加荷速率(CRL)固结试验过程进行了模拟分析,并采用“栓塞效应”理论解释了在先期固结压力Pc附近孔隙水压力分布及其土样变形速率的变化特征。计算分析及大量的试验结果都表明,在CRL试验条件下,试样的变形速率-平均有效应力曲线在Pc附近会出现典型的波动变化。进一步分析证实,这种现象与Pc有唯一确定的关系。本文分析了产生这种波动现象的原因和机理,并由此提出利用CRL试验的变形速率-平均有效应力曲线确定先期固结压力Pc的方法。
In this paper, the computerized equivalent loading rate (CRL) consolidation test was used to simulate the process, and the “embolism effect” theory was used to explain the variation of pore water pressure distribution and soil deformation rate near the preconsolidation pressure Pc. The calculation analysis and a large number of test results all show that under the CRL test conditions, the specimen deformation rate-average effective stress curve will appear typical fluctuations in the vicinity of Pc. Further analysis confirmed that this phenomenon is uniquely related to Pc. This paper analyzes the causes and the mechanism of this kind of fluctuating phenomenon, and proposes the method of determining the preconsolidation pressure Pc using the deformation rate-average effective stress curve of the CRL test.