摘要
将概率统计理论引入软黏土地基一维固结问题的分析中,提出了软黏土地基一维固结概率设计系数法。该方法用设计系数将软黏土地基一维固结概率设计与常规设计联系起来。竖向固结系数的设计值等于其标准值与设计系数的乘积,或者等于其均值与中心设计系数乘积。推导了竖向固结系数为对数正态分布和伽玛分布时设计系数的计算公式,并据此研究了设计系数的变化规律。中心设计系数是竖向固结系数变异系数的减函数,而是失效概率的增函数。研究了竖向固结系数标准值的计算方法。为便于工程查用,提供了设计系数图表。给出了软黏土地基一维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 for soft clay foundation, namely probability design coefficient method, is proposed. The design value of vertical consolidation coefficient is adopted as the product of standard value times the design coefficient or equal to the product of average value times the design coefficient.The formula for calculation of design coefficient in the condition of vertical consolidation coefficient being either lognormal or gamma distribution is deduced and the variation law of design coefficient is studied. It is found that the central design coefficient is a decreasing function of the variation coefficient of vertical consolidation coefficient and is an increasing function of probability of failure. The tables and diagrams for calculation are given.A probability design procedure for 1D consolidation of soft clay foundation is estabished. Examples for demonstration of practical application are given.
出处
《水利学报》
EI
CSCD
北大核心
2003年第10期81-86,共6页
Journal of Hydraulic Engineering
关键词
软黏土
一维固结
固结度
概率设计
设计系数
中心设计系数
设计值
标准值
soft clay
1-D consolidation
degree of consolidation
probability design
design coefficient
central design coefficient
design value
standard value
