基于遗传算法的SMW围护结构水泥土刚度系数计算  

Computation on rigidity coefficient of cemented-soil based on genetic algorithm

作　　者：谢秀栋[1] 方建瑞[1] 李志高[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《岩土工程学报》2006年第B11期1422-1424,共3页Chinese Journal of Geotechnical Engineering

摘　　要：SMW工法是水泥土搅拌桩内插H型钢的复合围护结构,其结构主要包括水泥土和芯材两大主要部分。围护结构的受力特性非常复杂,型钢的物理力学性质在施工过程时应力水平下比较稳定,基本处于线弹性范围,而水泥土的应力应变特性呈现明显的非线性特性,围护结构的刚度变化主要是水泥土的刚度变化。由于试验数据与工程经验还很有限,准确确定水泥土的刚度贡献值存在一定困难。本文引进遗传算法,在深基坑工程底板浇筑完成时各测点位移量测资料基础上,进行位移反分析,得到复合结构弹模Ecs与惯性矩Ics的优化取值,从而得出各测点在该工况下的刚度系数,该值与推荐曲线较为接近,说明反演分析的可行性。The composite structure with H-shaped steel and deep cemented-soil piles is called SMW method. Stress-strain characteristics are extremely complex during the course of the pit excavation. The curves of H-shaped steel strain are under the linear elastic scope, but cemented-soil is nonlinear response, and the rigidity changes of composite structure mainly by the cemented-so~. It is difficult to accurately calculate the coefficients of rigidity, owing to the shortage of the experimentation and the engineering experience. Applying the observed deformation data of deep foundation pit when the excavation was completed, E^s and Ics were obtained with displacement back analysis, then the coefficient of rigidity was calculated. Results of the case demonstrate that the computation is justified and back analysis is recommendable.

关 键 词：深基坑 SMW工法 刚度系数 遗传算法 位移反分析 

分 类 号：TU473[建筑科学—结构工程]