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A more general assumption than that in the classical onedimensional large strain consolidation theory is adopted and the exact analytical solution of nonlinear finite strain selfweight consolidation based on this assumption is obtained.




 Based on the research of the one dimensional large strain consolidation theory,the expressions of large strain coefficient of consolidation in different coordinates are given in this paper.In order to study the development regularity of lareg strain coefficient of consolidation ,it is supposed that the coefficient of permeability and the effective stress follow the semi logarithm linear relation with void ratio.It is shown that the coefficient of consolidation... Based on the research of the one dimensional large strain consolidation theory,the expressions of large strain coefficient of consolidation in different coordinates are given in this paper.In order to study the development regularity of lareg strain coefficient of consolidation ,it is supposed that the coefficient of permeability and the effective stress follow the semi logarithm linear relation with void ratio.It is shown that the coefficient of consolidation is the function of the effective stress or void ratio,and its development regularity is related to the physical and mechanical characteristics of soil.  本文在一维大变形固结理论研究的基础上，给出了大变形固结系数的定义及其不同描述方法时的具体表达式，并采用土体ｅ～ｌｏｇσ′和ｅ～ｌｏｇｋ线性假定，探讨了一维大变形固结系数在固结过程中的变化规律．通过研究表明，考虑土体大变形性状的一维固结系数是有效应力（或孔隙比）的函数，其变化规律与土的物理力学特性有关．  Fully saturated soft soil has relatively great settlement under external load. The error is unacceptable when using little strain consolidation method, which can only be solved by large strain nonlinear consolidation computation. Genetic Algorithm (GA) is a global optimization and search biological modeling method. With the emerge of complex large scale nonlinear system, GA has been used increasingly in recent years and now GA can be found in many fields. In the paper, GA is improved especially in the crossover... Fully saturated soft soil has relatively great settlement under external load. The error is unacceptable when using little strain consolidation method, which can only be solved by large strain nonlinear consolidation computation. Genetic Algorithm (GA) is a global optimization and search biological modeling method. With the emerge of complex large scale nonlinear system, GA has been used increasingly in recent years and now GA can be found in many fields. In the paper, GA is improved especially in the crossover operator and the roulette wheel model. Then the improved GA is applied to the large strain consolidation problems to estimate the key parameters. Research indicates that this method is quite effectual and worth studying further.  含水量很高的饱和软土在外荷载作用下沉降很大,小变形分析误差太大,必须通过大变形非线性固结计算来模拟。遗传算法是一种全局优化和搜索的仿生算法。近年来随着工程领域中复杂的大规模非线性系统的出现,遗传算法日益得到青睐,目前已经广泛应用到各个领域中。本文对遗传算法做了改进,主要体现在杂交算子的选取和轮盘赌模型的模拟退火拉伸,并将其用于饱和软土的大变形固结分析,解决其中的关键参数识别问题。研究表明该方法是行之有效的,值得进一步研究探索。  Theoretical analysis was carded out on one dimension consolidation of saturated soft soil under attenuation loading.A small strain consolidation model was established,and the decay law of loading in consolidation process was investiga ted.The boundary value problems for small strain consolidation and large strain consolidation were solved.The predicting settle ments of 6 sites under attenuation loading using large strain consolidation theory are close to the measuring settlement values in si tu.... Theoretical analysis was carded out on one dimension consolidation of saturated soft soil under attenuation loading.A small strain consolidation model was established,and the decay law of loading in consolidation process was investiga ted.The boundary value problems for small strain consolidation and large strain consolidation were solved.The predicting settle ments of 6 sites under attenuation loading using large strain consolidation theory are close to the measuring settlement values in si tu.  研究了衰减荷栽作用下软土一维固结问题,建立了小变形固结模型,探讨了荷载衰减规律,分别求解了相应的小变形和大变形固结边值问题；通过理论解答与6块场地实测沉降的比较,表明用考虑荷载衰减的大变形固结理论计算软土一维固结的沉降值与实测结果接近。  
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