预应力路堤侧压力板间距确定方法初探  

Determination method of lateral pressure plate spacing of a prestressed embankment

作　　者：冷伍明[1,2] 董俊利 徐方[1,2] 赵春彦[1] 阮波[1] 叶新宇[1] 张期树[1] LENG Wuming;DONG Junli;XU Fang;ZHAO Chunyan;RUAN Bo;YE Xinyu;ZHANG Qishu(School of Civil Engineering,Central South University,Changsha 410075,China;Key Laboratory of Engineering Structure of Heavy Railway,Ministry of Education,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学重载铁路工程结构教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2022年第1期100-111,共12页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978672);湖南省自然科学基金资助项目(2021JJ40766);中南大学研究生自主探索创新项目(2021zzts0230)。

摘　　要：侧压力板的间距合理布置是新型预应力路堤加固法需要解决的关键问题。基于水平附加应力计算公式,建立多块侧压力板联合作用下薄弱加固区域内薄弱点O处的水平附加应力计算方法,通过大量计算获得薄弱点O处水平附加应力的扩散规律,并探索侧压力板布置间距的设计方法。研究结果表明:1)通过引入侧压力板沿路堤坡向净间距V与板宽W之比a(=V/W),沿路堤纵向净间距H与W之比b(=H/W)和计算点水平深度h与W之比h_(c)(=h/W)3个无量纲参数,可将不同板宽下单块侧压力板在薄弱点O处的水平附加应力扩散规律归一化统一表示;2)不同板净间距系数a(或b)下,薄弱点O处的水平附加应力系数K_(O)均随水平深度系数h_(c)的增加先增大后减小,并在有效扩散深度系数h_(pc)处达到最大值K_(p),各峰值点相连可形成一条光滑的峰值迹线;3)不同工况下,h_(pc)~a均呈抛物线递增函数关系,h_(pc)~b则均呈抛物线递减函数关系。4)不同工况下,h_(pc)~a和h_(pc)~b的关系图表综合形成了预应力路堤侧压力板的间距设计方法,可依据具体工程需求结合图表设计侧压力板的布置间距。研究成果可为预应力路堤侧压力板的布置设计提供一种快速且简便的设计方法。The rational layout spacing of lateral pressure plates (LPPs) was a key problem that needs to be solved in the new prestressed embankment reinforcement method.Based on the calculation formulas of the horizontal additional stress,a new method was developed to calculate the horizontal additional stress at the weak point of the weak reinforcement region under the combined action of multiple LPPs.Then,the diffusion law of horizontal additional stress at the weak point was obtained through a large number of calculations.The method for designing the layout spacing of LPPs was explored.The results are drawn as follows.1) By introducing three dimensionless parameters,i.e.,the ratio of the LPP net spacing along the embankment slope to the plate width (Ratio a),the ratio of the LPP longitudinal net spacing to plate width (Ratio b),and the ratio of the horizontal depth of the calculation point to plate width (Horizontal depth coefficient),the diffusion law of the horizontal additional stress of the weak point subjected to a single LPP but with different plate width values can be normalized and unified.2) The horizontal additional stress coefficient at the weak point under different plate net spacing coefficients a (or b) first increases and then decreases with the increase of horizontal depth coefficient,reaching the maximum value at the effective diffusion depth coefficient.Connections of the peak points can form a smooth peak trace.3) Under different working conditions,the depth coefficientwith Ratio a shows a parabolic increasing function relationship,while the depth coefficientwith Ratio b exhibits a parabolic decreasing function relationship.And 4) The two relationship charts of the depth coefficientwith Ratio a and depth coefficientwith Ratio b correlations under different working conditions comprehensively form the spacing design method of LPPs,and the layout spacing of LPPs can be designed according to the specific engineering requirements in combination with the charts.The research results can provide a fast and si

关 键 词：预应力路堤 侧压力板 水平附加应力 布置间距 设计方法 

分 类 号：U213[交通运输工程—道路与铁道工程]