悬索桥重力式锚碇结构变位规律研究  

Research on displacement of anchorage of suspension bridge

作　　者：李家平[1] 李永盛[2] 王如路[1] 

机构地区：[1]上海地铁运营有限公司监护分公司,上海200003 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2007年第1期145-150,共6页Rock and Soil Mechanics

基　　金：上海市重点学科资助项目。

摘　　要：采用室内相似模型试验和数值模拟方法,对某悬索桥重力式锚碇变位问题进行了研究。相似模型的几何相似常数为1:100,体积力相似常数为1:1.325。数值模拟取相似模型试验条件,土体服从摩尔-库仑准则,锚碇和围护结构视作弹性体,选用模型试验相似材料实际参数。研究表明,软土中锚碇结构的变位随锚拉力变化的规律为:在锚拉力作用下,锚碇不仅向前水平位移,而且产生前端下沉、后端隆起的刚体转动,变位随锚拉力的增加呈非线性增大。锚碇基础下部地基加固、锚碇基坑围护结构以及锚碇周围土体对提高锚碇稳定性具有积极作用。Based on model test and numerical simulation, the research on displacement of a gravity anchorage of a suspension bridge has been carried out. The model test is carried out with geometrical scale 1：100 and soil mass force scale 1：1.325. Numerical simulation adopts the same conditions of the model test. The Mohr-Coulomb yield criterion is used for soil. Anchorage and pit-supporting structure are regarded as elastic mass. Parameters are chosen according to the similar material of the model test. The research gives the displacements of anchorage under different load conditions. For the designing load, it is shown that the anchorage itself has horizontal displacement and rigid rotation with forepart sinking and back-end heaving. Displacement increase with the designing load added. In addition, the soil improvement, pit-supporting structure and surrounding soil mass contribute greatly to the stability of the bridge anchorage.

关 键 词：悬索桥 重力式锚碇 相似模型试验 数值模拟 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U443.24[交通运输工程—道路与铁道工程]