摘要
为探究压实次数对路基承载力的影响,以及承载板法、落锤式弯沉仪、刚度仪3种试验方式测定的路基承载性能的线性相关性,文章以理论计算为依据,对承载板法路基回弹模量参数计算方法进行优化,结合贵州正习高速公路试验段实测数据,对路基承载力参数进行相关性分析。结果表明:1)承载板法逐级加压与卸载会影响测点处路基承载性能,因对计算结果进行原点修正;2)碎石土路基中,路基回弹模量随压实次数的增加而出现减小趋势,压实5次后,平均路基回弹模量降低了13.9%;3)路基刚度整体随碾压次数的增加而呈现出锯齿状变化,最大增幅为22.6%,最大降幅为34.6%;4)相关性分析结果显示:承载板法测得回弹模量与便携式落锤仪、刚度仪测定结果具有良好相关性,便携式落锤弯沉测定结果与刚度仪测得的刚度之间线性相关性较弱,工程中需配合其他测定手段综合判定路基承载性能。
To explore the effect of compaction times on the bearing capacity of the subgrade, and the linear correlation of the bearing performance of the subgrade measured by three test methods: bearing plate method, drop weight bending meter and stiffness meter.Based on theoretical calculation, the calculation method of resilience modulus of roadbed with bearing plate method was optimized, and the correlation analysis of roadbed bearing capacity parameters was carried out based on the measured data of the test section of Zhengxi Expressway in Guizhou Province.The results show that: 1)Step by step loading and unloading with the bearing plate method will affect the bearing performance of the roadbed at the test point, because the calculation results are modified by the origin;2)In the gravel soil subgrade, the subgrade resilience modulus decreases with the increase of compaction times.After compaction for 5 times, the average subgrade resilience modulus decreases by 13.9%.3)With the increase of rolling times, the overall stiffness of the roadbed presents a zigzag change, with the maximum increase of 22.6% and the maximum decrease of 34.6%;4)Correlation analysis results show that: There is a good correlation between the resilience modulus measured by the bearing plate method and the results measured by the portable drop weight instrument and the stiffness meter, but the linear correlation between the portable drop weight bending measurement results and the stiffness measured by the stiffness meter is weak.In the project, other measurement methods should be used to comprehensively determine the bearing performance of the roadbed.
作者
陈良锐
何俊雄
CHEN Liangrui;HE Junxiong(CMCU Engineering Co.,Ltd.,Chongqing400041,China)
出处
《工程建设》
2024年第8期56-60,共5页
Engineering Construction
关键词
路基承载力
检测试验
压实次数
相关性分析
subgrade bearing capacity
detection test
compaction number
correlation analysis
