河内-海防高速公路深厚软基沉降预测研究

基于越南河内-海防高速公路EX-5标段工程实例,在现场监测数据和地勘资料的基础上,借助大型有限元商业软件ABAQUS,模拟了越南深厚软土排水板堆载预压下的土体固结沉降过程;针对数值模拟中模型参数选取困难的问题,将优化算法与有限元软件结合,利用C语言编写了遗传算法-ABAQUS反分析程序,并用实例对此程序的适用性进行了验证。得到如下结论:无论是变形模量还是泊松比,路基恒载期沉降量对两者的敏感度要大于堆载期的敏感度;反演计算的最终沉降与实际沉降比较接近,相对误差基本都在10%以内,这说明编制的ABAQUS-遗传算法固结反分析程序反演出的参数值是有效的、可行的。

Forecast study on settlement of soft foundation on Vietnam Hanoi-Hai Phong expressway

In this paper,based on the measured data from section EX-5 of Vietnam Hanoi - Hai Phong expressway and by using ABAQUS software,the soil consolidation settlement process was simulated by the method of drain with pre-loading.We made the genetic algorithm combine with ABAQUS software and wrote genetic algorithm-ABAQUS back analysis program to solve the shortcomings of the numerical simulation method.Then this paper compiled the genetic algorithm -ABAQUS back analysis program,which was verified by application examples.The comprehensive researches show that: (1).The sensitivity of deformation modulus and poisson's ratio in constant load is greater than the sensitivity of preloading.(2).The final settlement of inversion calculation is close to the actual settlement.The relative error is within 10%.This shows that the parameters of the anti - performance parameters of the ABAQUS- genetic algorithm are effective.In engineering,it is feasible to predict the subsidence by using this method.