摘要
深基坑围护桩体上各监测点之间的变形是相互影响的,在现代信息化施工过程中,对围护桩体变形的预测应该考虑到监测点之间的相关信息,应该从变形观测系统的高度统一来描述变形体的整体变形趋势和变形规律,从整体上对变形观测的数据进行正确的处理,建立合理的模型,对变形值作出准确的预报。基于这一思想,通过对传统的单点GM(1,1)模型的扩展,考虑n个点之间相互关联和影响,以MATLAB语言编程,实现对变形体上相互关联的多点变形预测模型的建模和预测,并运用该模型对北京市地铁奥运支线深基坑的围护桩变形进行预测。研究结果表明,预测值与实测值吻合较好,能够更为准确地预测出后续施工进程中围护桩体的水平位移,在指导该工程信息化施工和规避工程风险等方面起到积极的作用。同时通过与传统GM(1,1)模型预测结果的比较,证明了多变量灰色系统预测模型具有更高的准确性,显示了该方法进行深基坑变形预测的有效性。
During the information construction times,with the aim of accurately predicting the deformation of supporting piles,the correlations between the measurement points in supporting piles should be taken into account in predicting the deformation of supporting structure for deep pit excavations;and the analysis of monitoring data and establishment of a proper model should be performed on the basis of the deformation behavior of the entirely deformed system;and because deformation of one measuring point has an influence on another in the same supporting pile of deep pit. Based on such concept,a single deformation prediction model is extended into a multi-point mode1 and coded with MATLAB. A multi-point prediction model is established,and its application to a case study is presented to verify the multi-point model. The results indicate that the proposed model is effective for predicting the deformation of supporting structures for deep excavations,more effective than the grey prediction model GM(1,1) for information construction of the engineering.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第S2期4319-4324,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
灰色系统
多变量灰色预测
深基坑
围护结构
soil mechanics
grey system
multi-point grey prediction model
deep foundation pit
supporting s t ructure
