深基坑位移动态反演正算综合预测

SYNTHETICAL PREDICTION WITH DYNAMIC BACK-ANALYSIS AND NORMAL COMPUTATION OF DEEP EXCAVATION DISPLACEMENT

在纽玛克方法和考虑土体超载的弹性地基梁法基础上建立了位移计算的力学模型,能较准确的模拟实际工程.考虑支护结构与土变形协调,提出锚杆刚度折减的梯形法.运用动态位移反演分析方法确定了土性参数,反演分析过程中复合形退火算法得到运用,成功地对后续工况中基坑围护结构变形及其稳定性作出了预测,实现了信息化设计和施工.

A mechanics modle of calculating displacement based on New Mark numerical calculating method and elastic foundation beam considering over loading of upper-soil was set up, which can simulate practical project exactly. Considering the deformation harmony of the soil and the bracing structure, a new method, called trapezium method of reduction the rigidity of anchor pole was introduced. The soil＇s parameters were determined by dynamic displacement back-analysis method, in which complex simulated annealing method was used. Then the deformation tendency of the bracing structure and its stability were predicted successfully, so information design and construction were realized.