路基弹性模量野外试验获取的3种方法对比分析  

Comparison and Analysis of Three Methods for Obtaining the Elastic Modulus of Roadbed through Field Tests

作　　者：潘春为 刘锋 包聪灵 青健 张鹏 许新权 PAN Chun-wei;LIU Feng;BAO Cong-ling;QING Jian;ZHANG Peng;XU Xin-quan(Guangdong Communications Industrial Investment Co.Ltd.,Guangzhou 510623,China;Guangdong Hualu Transport Technology Co.Ltd.,Guangzhou 510420,China;Guangdong Jiaotong Technology Research and Development Co.Ltd.,Guangzhou 510420,China)

机构地区：[1]广东交通实业投资有限公司,广州市510623 [2]广东华路交通科技有限公司,广州市510420 [3]广东交科技术研发有限公司,广州市510420

出　　处：《公路》2024年第12期79-85,共7页Highway

基　　金：广东省基础与应用基础研究基金项目,项目编号2022A1515011326;广东省交通集团研究项目,项目编号JT2022YB12。

摘　　要：为了获取施工现场路基弹性模量数据,依托广东省某高速公路路基工程,开展了承载板法、贝克曼梁法(BB法)和落锤式弯沉仪法(FWD法)路基弹性模量试验研究。在明晰了各种方法获取路基弹性模量理论基础的前提下,于试验区域开展了3种方法的试验研究及贝克曼梁法和落锤式弯沉仪法的比对试验。基于试验结果,提出了3种试验方法在现场试验时应遵循的技术要点;同时,提出路基验收时需同时控制路基表面弯沉和路基弹性模量两个指标。研究结果显示,3种方法均是基于弹性半空间理论,但存在一定差异。承载板法是通过刚性承载板直接于路基现场获得回弹模量的方法,BB法是通过获得双圆荷载中心处弯沉后经反算获得路基模量的方法,FWD法是通过获得柔性承载板中心弯沉后反算路基弹性模量的方法。与承载板法和BB法比较可知,FWD法的自动化程度和效率较高,受人为和环境因素影响较小,因此,推荐使用该方法进行路基表面弯沉验收和弹性模量的反算。In order to obtain the data of subgrade elastic modulus in the construction site,based on an expressway subgrade project in Guangdong Province,the experimental research on subgrade elastic modulus are carried out by means of bearing plate method,Beckmann beam method and falling weight deflectometer method.On the premise of clarifying the theoretical basis of obtaining subgrade elastic modulus by various methods,the experimental study of three methods and the comparison test between Beckmann beam method and falling weight deflectometer method are carried out in the experimental area.Based on the test results,the technical key points that should be followed in the field test of three test methods are put forward,and at the same time,it is proposed that the surface deflection and elastic modulus of subgrade should be controlled at the same time in the acceptance of subgrade.The results show that all three methods are based on elastic half-space theory,but there are some differences.Bearing plate method is a method to obtain rebound modulus directly on the subgrade site through rigid bearing plate.BB method is the method of obtaining the modulus of subgrade by back-calculation after obtaining the deflection at the center of double-circle load.The FWD method is a method of back-calculating the elastic modulus of the roadbed by obtaining the center deflection of the flexible bearing plate.Compared with bearing plate method and BB method,FWD method has higher automation and efficiency,and is less affected by human and environmental factors.Therefore,it is recommended to use this method for subgrade surface deflection test and back calculation of elastic modulus.

关 键 词：道路工程 路基弹性模量 野外试验 对比分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU413[建筑科学—岩土工程]