摘要
为研究填石路基梁场硬化层利用技术及压实质量控制,该文以广东某高速公路为依托工程,提出不同工况下填石路基的优化设计与施工控制方法。当硬化层标高低于路床顶面标高且硬化层顶面弯沉值小于填石路基顶面弯沉值时,可直接在硬化层上填筑碎石料至路床顶面标高,并按含刚性夹层的填石路基进行验收和路面设计;当硬化层标高达到路床标高且其顶面弯沉值小于填石路基顶面弯沉值后,则可直接利用。最后,依托试验段分析不同施工和压实方案下的路基压实质量。结果表明:采用“先强振后弱振”的压实工序效果更佳,采用26 t压路机碾压5遍后,沉降趋于稳定;基于重型动力触探,建立了锤击数与孔隙率经验公式。压实质量快速检测技术,可用于压实质量的快速检测;通过复测实体工程梁场硬化层顶面高程,并开展不同标高下的硬化层模量反算研究,采用便携式落锤式弯沉仪(PFWD)和贝克曼梁法(BB)对梁场硬化层回弹模量进行联合测试,发现PFWD与BB法的反算结果具有显著的相关性,可综合评价梁场硬化层力学性能,为路面加铺结构优化提供参数依据。
To investigate the utilization technology and compaction quality control of hardened layers in the beam yard of rock-filled roadbed,the optimization design and construction control methods for rock-filled roadbed under different conditions were proposed based on a highway project in Guangdong Province.When the elevation of the hardened layer was lower than the top surface elevation of the roadbed and the top surface bending and settlement value of the hardened layer was less than that of the rock-filled roadbed,the gravel material could be filled directly on the hardened layer to the top surface elevation of the roadbed,and acceptance and pavement design could be conducted according to the rock-filled roadbed with rigid sandwich.When the elevation of the hardened layer reached the elevation of the roadbed and the top surface bending and settlement value of the hardened layer was less than that of the rock-filled roadbed,the hardened layer can be used directly.The compaction quality of the roadbed under different construction and compaction schemes was analyzed based on the test section.The results show that the compaction process under strong vibration followed by weak vibration is better,and the settlement is basically in a stable state after five rolling passes with a 26 t roller.The empirical formula for the number of hammer blows and porosity was established based on heavy-duty power tapping.The rapid detection technology of compaction quality can be used for rapidly detecting compaction quality.The elevation of the top surface of the hardened layer in the beam yard of the physical project was remeasured,and the backcalculation study of the modulus of the hardened layer under different elevations was carried out.The rebound modulus of the hardened layer in the beam yard was jointly tested by the portable falling weight deflectometer(PFWD)and the Beckman beam(BB)method.It is found that the backcalculation results of the PFWD and BB methods are significantly correlated.The backcalculation results can comprehensively evaluate the mechanical properties of the hardened layer in the beam yard and provide a parameter basis for the optimization of the pavement overlay structure.
作者
程小亮
田文迪
郜梦棵
周栩佳
CHENG Xiaoliang;TIAN Wendi;GAO Mengke;ZHOU Xujia(WISDRI City Construction Engineering Technology Co.,Ltd.,Wuhan,Hubei 430063,China;Xiangyang Municipal Construction Engineering Co.,Ltd.,Xiangyang,Hubei 441000,China;Key Laboratory of Special Environment Road Engineering of Hunan Province,Changsha University of Science&Technology,Changsha,Hunan 410114,China)
出处
《中外公路》
2025年第6期25-35,共11页
Journal of China & Foreign Highway
基金
湖南省自然科学基金资助项目(编号:2022JJ30598)。
关键词
道路工程
填石路基
压实工艺
重型动力触探
模量反算
PFWD
road engineering
rock-filled roadbed
compaction process
heavy-duty power tapping
modulus backcalculation
PFWD
