落锤式弯沉仪评估路基模量的试验研究  

Research on Assessment of the Subgrade Modulus by Falling Weight Deflectometer

作　　者：梁智超 李慧文 刘天赐 苏兴茂 侯相琛[1] LIANG Zhi-chao;LI Hui-wen;LIU Tian-ci;SU Xing-mao;HOU Xiang-chen(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,哈尔滨市150090

出　　处：《公路》2025年第3期62-69,共8页Highway

基　　金：黑龙江省交通运输厅科技项目,项目编号MJ20170005。

摘　　要：路基模量是评价道路结构承载力的关键指标,其大小受含水率影响显著。研究提出利用落锤式弯沉仪(FWD)实测弯沉盆预估运营期路基模量的快速检测方法。首先,选取4个公路黏土路基试验路段,并在每个试验路段上布置6个断面30个测点;其次,在每个测点上进行落锤式弯沉仪弯沉盆测试,采用4级加载的方式建立各个测点荷载修正公式,得到标准荷载下弯沉盆曲线;同时,对每个横断面的各测点下黏土路基顶面进行土壤取样,测定获得实际含水率和静态模量;最后,绘制弯沉盆曲线面积和黏土路基顶面平均含水率的关系图,通过弯沉盆曲线面积快速预估路基顶面平均含水率,进而预估土基模量范围。该方法为实现路基模量的快速检测与评估提供了新的技术途径。The subgrade soil modulus is a key indicator for evaluating the bearing capacity of road structures,which is significantly affected by moisture content.In the study,a rapid detection method using the deflection basin measured by the Falling Weight Deflectometer(FWD)is proposed to estimate the average moisture content of the subgrade top surface during the operation period.Firstly,four test sections of highway clay subgrade are selected,and 30 measurement points are arranged on each test section of total six sections.Secondly,the FWD test is conducted at each measurement point and load correction formulas are established using a four-stage loading method to obtain the bending basin curves under standard loads.At the same time,soil samples are taken from the top surface of the clay subgrade at each measurement point in each cross-section to determine the actual moisture content and resilient modulus.Finally,the relationship between the area of the curve area of the bending basin and the average moisture content of the top surface of the clay subgrade is plotted,which allows for the rapid prediction of the average moisture content of the top surface of the clay subgrade based on the curve area of the bending basin,and consequently,the range of the subgrade resilient modulus.The method provides a new technical way to achieve rapid detection and assessment of subgrade resilient modulus.

关 键 词：黏土路基 路基含水率 路基模量 FWD 无损检测 

分 类 号：U416.1[交通运输工程—道路与铁道工程]