河内-海防高速公路深厚软基沉降预测研究

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

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。

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 simu- lated 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 short- comings of the numerical simulation method. Then this paper compiled the genetic algorithm - ABAQUS back analysis program, which was verified by application examples. The comprehensive re- searches show that ： （ 1 ）. The sensitivity of deformation modulus and poisson~ ratio in constant load is greater than the s^ensitivity 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.