砂井地基固结概率设计的中心设计系数方法

Probability Design by Center Design Coefficient of Consolidation of Sand-drained Ground

将概率统计理论引入砂井地基固结问题的分析中,提出了砂井地基固结概率设计的中心设计系数方法,该方法用设计系数将砂井地基固结概率设计与常规设计联系起来。径向固结系数的设计值等于其均值与中心设计系数乘积。推导了径向固结系数为伽玛分布时中心设计系数的计算公式,并据此研究了中心设计系数的变化规律。提出了砂井地基固结概率设计的一般步骤,并用算例说明了该法在实际工程中的应用。

On the basis of probability and statistics theory, the probability design method by central design coefficient is proposed,which is correlated with the conventional design by the mean of central design coefficient. The design value of radius coefficient of consolidation can be made by multiplying its standard value and central design coefficient. Under the conditions of the radius coefficient of consolidation being a gamma distribution, the formulas for computing central design coefficient are derived. According to these formulas, the variation of central design coefficient is studied,which is decreasing function of variation coefficient of consolidation radius coefficient, and increasing function of probability of failure. A probability design procedure for consolidation of sand-drained ground is established and its practical application is illustrated by example.