滨海砂路基结构强度控制研究  

Study on Coastal Sand Embankment Structural Strength Control

作　　者：刘江鑫 李凌云 吴立坚[1] 宋常军[1] 韩志杰 LIU Jiang-xin;LI Ling-yun;WU Li-jian;SONG Chang-jun;HAN Zhi-jie(Research Institute of Highway,Ministry of Transport,Beijing 100088,China;National Observation and Research Station of Corrosion of Road Materials and Engineering Safety in Dadushe,eijing 100088,China;Hainan Province Communications Investment Holding Co.,Ltd.,Haikou,Hainan 570203,China;Hainan Round-Island-Touring Highway Investment and Development Co.,Ltd.,Haikou,Hainan 570203,China)

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]北京大杜社公路材料腐蚀与工程安全国家野外科学观测研究站,北京100088 [3]海南省交通投资控股有限公司,海南海口570203 [4]海南交投环岛旅游公路投资开发有限公司,海南海口570203

出　　处：《公路交通科技》2024年第11期114-123,共10页Journal of Highway and Transportation Research and Development

基　　金：海南省交通科技项目(HNJTT-KXC-2023-4-23-01)。

摘　　要：为实现滨海砂利用率最大化,针对路基结构强度设计指标要求,采用层状弹性体系理论对两侧包边、上覆改良层的滨海砂填芯路基结构强度进行了研究。明确了砂芯模量、改良层模量及改良层厚度对路基结构顶面回弹模量的影响;提出了路基结构强度控制设计理念和技术。室内外试验结果显示,滨海砂材料的CBR强度随着压实度的提高而增长;经压实后的滨海砂满足公路路基对路基填料CBR值的要求,但滨海砂级配不良、黏聚力低,其单纯滨海砂结构表层无法满足路基结构回弹弯沉指标的要求,因此采取双侧包边和上覆改良层结构可充分发挥滨海砂芯的材料强度性能并满足路基结构回弹模量的强度要求。结果表明:路基顶面当量回弹模量分别与滨海砂自身回弹模量、改良层回弹模量及改善层厚度显著相关,由此建立了多元非线性回归经验公式,获取的路基顶当量回弹模量经验解与层状体系结构的理论解相近;经验公式的提出为改良层的材料选择和厚度优化提供了精准、便捷的计算工具,从而有效实现了对路基结构强度的合理控制,为滨海砂在滨海公路建设中的大量利用、降低建设成本、保护生态环境奠定了可靠的理论支撑。To maximize the coastal sand utilization,in accordance with the design requirements for embankment structural strength,this study investigated the coastal sand-filled embankment structural strength with edge wrapping and improved top layer by using the layered elastic system theory.The influences of sand core modulus,improved layer modulus,and improved layer thickness on embankment top surface modulus rebound were clarified.The design concepts and techniques for structural strength control were proposed.The laboratory and field test results show that the coastal sand CBR strength increases with the compaction.The compacted coastal sand meets the CBR value requirements for highway embankment fillers.However,due to the poor gradation and low cohesion of coastal sand,the pure coastal sand structure surface layer does not meet the rebound deflection requirements for embankment structures.Therefore,adopting an edge-wrapped and improved layer structure can fully utilize the material strength performance of coastal sand core,while satisfying the strength requirements of embankment rebound modulus.The result indicates that the equivalent rebound modulus of embankment top surface is significantly correlated with the sands’own rebound modulus,the improved layer’s rebound modulus,and the improved layer thickness.Thus,the multivariate nonlinear regression empirical formula was established.The empirical solutions for embankment top surface equivalent rebound modulus closely align with the theoretical solutions of layered system structure.The introduction of empirical formula provides a precise and convenient calculation tool for material selection and thickness optimization of improvement layer,effectively achieving the reasonable control over embankment structural strength.This lays a reliable theoretical foundation for the extensive utilization of coastal sand in coastal highway construction,reducing construction costs,and protecting the ecological environment.

关 键 词：道路工程 结构强度控制 多元非线性回归 滨海砂芯路基 当量模量 改良层 

分 类 号：U416.1[交通运输工程—道路与铁道工程]