高速铁路斜坡桩板结构路基稳定性影响因素分析  

Influence Factors on the Stability of Slope Sheet-Pile Structure Subgrade of High-speed Railway

作　　者：高霞[1] 肖宏[1] 王洪刚[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道标准设计》2013年第8期23-27,共5页Railway Standard Design

基　　金：国家自然科学基金(50908013);中央高校基本科研业务费专项资金资助(2011JBM079)

摘　　要：高速铁路斜坡软土地段的垂横向稳定性是其薄弱环节,主要破坏形式是斜坡路基横向位移过大以及路基的纵向开裂。在斜坡地段采用桩板结构路基可以显著提高路基的纵向、垂向、横向稳定性,提高列车运行舒适度。利用有限元软件ABAQUS建立斜坡桩板结构路基静力分析模型和车辆-轨道-斜坡桩板结构路基的动力耦合模型,分别研究列车在静荷载和动荷载作用下不同桩间距和桩长对桩板结构路基和路堤、边坡土体垂横向位移的影响。分析认为,桩板结构在斜坡地段应用时,为发挥其力学特性,应合理设置桩间距并采用不等桩长结构。Vertical and lateral stabilities are the weak links of slope soft-soil subgrade of high-speed railway. Excessive lateral displacement and longitudinal crack of slope subgrade are the major failure modes. However, using sheet-pile structure can significantly increase the longitudinal, vertical and lateral stabilities of the slope subgrade, and can improve the comfort level of train＇s running. In this paper, by using ABAQUS software of finite element method, the static analysis model of slope sheet-pile structure subgrade, and the dynamic coupling model among vehicle, track and slope sheet-pile structure subgrade, were all established. And then, the influences on vertical and lateral displacements in sheet-pile structure subgrade, in embankment and in soil of side slope, caused by different pile spacings and by different pile lengths under the action of train static and dynamic loads, were studied. The results show that when the sheet-pile structure is used in slope subgrade, the reasonable pile spacings should be arranged and the unequal lengths of piles should be adopted, so as to make full use of their mechanical property.

关 键 词：高速铁路 斜坡 桩板结构 有限元 桩间距 不等桩长 

分 类 号：U213.1[交通运输工程—道路与铁道工程]