摘要
以某长江公路大桥为背景,采用FLAC强度折减法数值模拟分析了建在防洪堤防上的主桥墩对该堤防稳定性影响。主要分析了施工前、桩基施工、基坑开挖、施加上部桥梁荷载这4种工况下堤防的应力状态、变形特征以及安全系数。研究结果表明:对以上4种工况下土石进行强度折减后,达到临界状态时主要变形和破坏发生在细砂层和粘土层,基岩层都未发生破坏。施工前、桩基施工、基坑开挖、施加上部桥梁荷载情况下堤防安全系数分别为1.77、1.75、1.73、1.64。这说明大桥刚刚建成时施加在堤防的上部桥梁荷载是对堤防安全最不利的。其他工况下堤防的安全系数略有降低,但影响不是很大。
Based on one Yangtze River Road Bridge,this article analyses the influence on the embankment stability by using the FLAC strength reduction numerical simulation,which contributes by the main abut-ment constructed above floodcontrol embankment.It mainly analyses the stress condition,distortion char-acteristic and safety coefficient of the embankment under the four conditions,namely,preconstruction stage,pilefoundation construction,excavation pit and load a up-bridge lication.Our results suggest that：first,after the strength reduction to the fill dam under the four working conditions,the main destroyed and deformed area occurs in the granulated sugar level and the clay layer,bedrock layer makes no difference. Second,the embankment safety coefficient is 1.77,1.75,1.73,1.64 respectively under the conditions of preconstruction stage,pilefoundation construction,excavation pit and load a up-bridge lication,which indi-cates that load application on upper bridge of the embankment is the most disadvantageous when the bridge has j ust completed.The safety coefficient has reduced slightly under other working conditions,which does not affect a lot.Third,the pile foundation pushes the earth together obviously and the edge of pile founda-tion produces the big bending moment during the work progress.
出处
《南昌大学学报（理科版）》
CAS
北大核心
2013年第6期594-600,共7页
Journal of Nanchang University(Natural Science)
基金
江西省教育厅青年科学基金资助项目(00009031)
国家自然科学基金资助项目(51268042)
关键词
堤防
稳定分析
强度折减法
FLAC
embankment
stability analysis
FLAC
strength reduction
