基于承载力和沉降的条形基础稳定性区间非概率可靠性综合分析方法

INTERVAL NON-PROBABILISTIC RELIABILITY COMPREHENSIVE ANALYSIS METHOD FOR STRIP FOUNDATION STABILITY BASED ON BEARING CAPACITY AND SETTLEMENT

提出采用区间值表示土体力学参数取值,以反映参数取值的不确定性特征,并根据参数取值特性建立出相应参数的区间值确定方法。在研究地基承载力计算方法基础上建立条形基础承载力区间非概率可靠性分析模型,并以沉降计算方法为基础建立条形基础沉降区间非概率可靠性分析模型。运用区间理论与一维优化算法求解非概率可靠性指标,并采用可靠性评价准则对条形基础稳定性进行综合评价,从而建立出基于承载力和沉降的条形基础稳定性区间非概率可靠性综合分析方法,该方法能综合反映承载力和沉降对条形基础稳定性的影响。工程算例分析表明该方法具有一定的合理性,能完善条形基础稳定性的可靠性分析方法与理论。

The interval values are used to denote the soil mechanical parameters, which can reflect the uncertainty of parameters values. The determining methods are also proposed according to the characteristics of parameters. The interval non-probabilistic reliability analysis model of strip foundation bearing capacity is developed based on study of calculation method of foundation bearing capacity. And the interval non-probabilistic reliability analysis model of strip foundation settlement is also established based on the settlement calculation method. Then, the solution of non-probabilistic reliability indexes is performed by interval theory and one-dimensional optimization algorithm. The comprehensive evaluation is carried out through the established reliability evaluation rules. The interval non-probabilistic reliability comprehensive analysis method for strip foundation stability based on bearing capacity and settlement is finally presented, which can reflect the influence of bearing capacity and settlement on strip foundation stability comprehensively. The calculation of engineering examples proves the feasibility of the method, which perfects the method and theory of reliability analysis for strip foundation.