郎林智, 项伟, 楼蓉蓉, 贾海粱. 2012: 确定先期固结压力数学模型的研究与应用. 工程地质学报, 20(5): 657-662.
    引用本文: 郎林智, 项伟, 楼蓉蓉, 贾海粱. 2012: 确定先期固结压力数学模型的研究与应用. 工程地质学报, 20(5): 657-662.
    LANG Linzhi, XIANG Wei, LOU Rongrong, JIA Hailiang. 2012: MATHEMATIC MODELS FOR DETERMINING PRE-CONSOLIDATION PRESSURE AND APPLICATION. JOURNAL OF ENGINEERING GEOLOGY, 20(5): 657-662.
    Citation: LANG Linzhi, XIANG Wei, LOU Rongrong, JIA Hailiang. 2012: MATHEMATIC MODELS FOR DETERMINING PRE-CONSOLIDATION PRESSURE AND APPLICATION. JOURNAL OF ENGINEERING GEOLOGY, 20(5): 657-662.

    确定先期固结压力数学模型的研究与应用

    MATHEMATIC MODELS FOR DETERMINING PRE-CONSOLIDATION PRESSURE AND APPLICATION

    • 摘要: 地基不均匀沉降一直是困扰工程建设者的一个难题,而土体的先期固结压力则是预测地基沉降量和采取预防措施的一个重要参数。利用基于Matlab软件自主开发的复合工具箱CFSPT(Curve Fitting Solving and Plotting Tool),结合太原市地面沉降中最为常见的粉质黏土,研究分析了现有5种数学模型和本人引入的Guass1、Gauss2模型对确定粉质黏土先期固结压力的适用性和数学模型确定的先期固结压力与《土工试验方法标准》中经验法确定值的差异,并分析了如何选择最优数学模型确定先期固结压力。结果表明: 7种数学模型回归分析程度均很高,但仅Guass1模型确定的先期固结压力与《土工试验方法标准》中的经验法确定的值最为接近; 最优数学模型应当满足elgp曲线在初始端趋于一非零定值,在末端趋近于0,中间段曲线要收敛于一条斜直线。

       

      Abstract: Pre-consolidation pressure is an important parameter which can help civil engineers predict foundation settlement, take preventive measures and finally solve the problem. This paper analyzes applicability of exiting five mathematical models and originally used Gauss1 Gauss2models to determine pre-consolidation pressure of silt clay. It examines the difference between the determined pre-consolidation pressure values with those mathematical models and that with the empirical method of standard for test methods of earthworks. It then suggests how to choose optimal mathematical model to determine pre-consolidation pressure through researched CFSPT by Matlab. It is shown that though seven mathematical models all have a high fitting degree, only the pre-consolidation pressure of Gauss1model approaches that of empirical method. Besides, the optimal mathematical model should have such characters that e-lgp curve converges a constant of nonzero at start, zero at end, and the middle of e-lgp curve converges a skew line.

       

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