摘要
根据弹性地基梁法基本思想,考虑基坑分步开挖和逐级加撑的动态施工因素,通过有限元计算模拟基坑实际开挖过程。结合现场监测数据,采用位移反分析方法反演各土层m值,并准确预测后续工况支护体的变形。采用有限元通用软件ANSYS内嵌的APDL语言编程建立支护体有限元计算模型,并应用数学软件MATLAB编制"改进单纯形法"优化程序,编写了接口程序,实现了MATLAB对ANSYS模型的实时循环调用和逐步寻优。武汉长江隧道武昌明挖段基坑工程算例证明,基于单纯形法的联合编程技术能方便、高效地被应用于支护体位移反分析预测中。建立了基于本工况预测下一工况或相邻断面的扩展型位移反分析预测模型,预测结果与实测结果拟合程度较高。
Based on the elastic foundation beam theory,the finite element method in which step excavation and support in stage is considered,is adopted to simulate the actual situation of excavation construction;and the displacement back analysis of m value of soils is carried out,according to field monitoring data,to provide reliable guarantee for predicting the deformations in succession construction stages.Firstly,support system FEM model is established by using APDL language embedded in ANSYS software.Then,the modified simplex optimization program is programmed by Matlab software,with calling the ANSYS FEM model circularly through original interface program in order to implement optimization inversion step by step.Through the calculation of deep foundation pit of Wuhan Yangtze River tunnel in Wuchang open excavation section,it is proved that the jointed programming technology based on modified simplex method can be easily and efficiently applied to the displacement back analysis and forecasting of retaining structure.Finally,an extended displacement back analysis and forecast model is established which can forecast the retaining structure displacement for the next working condition or adjacent sections based on the current condition.And the predicted results and measured results represent a high degree of fitting in the calculation example.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第3期899-904,共6页
Rock and Soil Mechanics
基金
武汉市建设委员会科研基金资助项目(No.200837)
关键词
改进单纯形法
联合编程
M值
位移反分析
modified simplex method
jointed programming technology
m value
displacement back analysis
