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A NUMERICAL METHOD FOR DETERMINING PRE-CONSOLIDATION PRESSURE
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摘要: Casagrande法为土体先期固结压力计算的作图法，其关键步骤之一在于压缩曲线后半段的拟合。鉴于传统作图法的复杂、作图比例不易把握等问题，基于MATLAB编写了先期固结压力的数值计算程序。在分析该模型在压缩曲线处理上不足的基础上，考虑土样扰动因素引入一个新的试验点，提出改进的先期固结压力数值计算方法。研究表明：土样室内固结试验应做中高压固结试验，压力一般应到1 600~3 200 kPa；对中高压固结的试验数据，新的计算方法能获得更加接近实际的先期固结压力，获得更好的结果。Abstract: The Casagrande method is a famous graphic method to obtain pre-consolidation pressure from consolidation test data, in which the one of the procedures is fitting the second half curve of compression curves based on the point of the greatest curvature. In the light of complexity and hard to control proper scales for the traditional graphic method, a program was developed by the software of MATLAB to calculate pre-consolidation pressure. Analysis on the deficiency of Harris Model on processing compression curves and taking account of disturbed factors for soil specimens, a new parameter from test was adopted, and the modified calculation method about the pre-consolidation pressure was proposed based on Harris model. It was shown that the calculated results by the modified method accorded with the actal pre-consolidation pressure for tests at medium and high pressure. Furthermore, soil consolidation experiments should contain higher pressure which could be 1 600 to 3 200 kPa.
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Key words:
- pre-consolidation pressure /
- Harris model /
- numerical calculation
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