铁道标准设计Issue(5)：49-54,6.DOI:10.1e2e8/j.issn.1004-2954.2014.05.012
高速铁路采空区群桩受力机理数值模拟
Numerical Simulation on Mechanical Mechanism of Pile-GrouP Foundation of High-sPeed Railway in Goaf Area
摘要
Abstract
The aim of this paper was to study the mechanical mechanism of bridge pile-group foundation of high-speed railway in goaf area, while a study of this kind still remains very rare at present. In this paper, the pile-group foundation of Guanshandi super-major bridge on Hefei-Fuzhou high-speed railway was taken as the example, and then the mechanical behavior of the pile-group foundation was revealed by the use of numerical simulation. The research result shows: ( a ) With the increasing of load, the pile-shaft axial force obviously changes at the upper part of the pile, gradually decreases along the pile shaft towards the bottom, and remains the same within the range of goaf roadway; all the piles are of end-bearing friction pile. ( b) The pile side friction increases at first and then decreases along the pile shaft, and the distribution centroid of the pile side friction of the whole pile lowers down;the distribution centroid of the pile side friction of the piles passing through the goaf area is deeper than that of piles not passing through the goaf area. ( c) The soil stress between piles below the bearing platform at the center place is larger than that at the edge places; and with the increasing of load, the increment rate of soil stress between piles is slower than that of pile top stress, that is to say, the pile top begins to bear a larger proportion of load.关键词
高速铁路/采空区/群桩基础/受力机理/数值模拟Key words
high-speed railway/goaf area/pile-group foundation/mechanical mechanism/numerical simulation分类
交通工程引用本文复制引用
梁鑫,程谦恭,杨颋,李传宝,黄太武..高速铁路采空区群桩受力机理数值模拟[J].铁道标准设计,2014,(5):49-54,6.基金项目
铁四院科技研究开发计划课题(2010Ke1) （2010Ke1）
