高液限黏土质砾路基碾压参数影响分析  

Analysis of the Influence of Rolling Parameters on High Liquid Limit Clay Gravel Roadbed

作　　者：孟雄 杨碧宇 赵勇 卞晓琳 Meng Xiong;Yang Biyu;Zhao Yong;Bian Xiaolin(Zhaotong Zhaoyang Ring Expressway Investment and Development Co.,Ltd.,Zhaotong 657000,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China)

机构地区：[1]昭通昭阳绕城高速公路投资开发有限公司,云南昭通657000 [2]交通运输部公路科学研究所,北京100088

出　　处：《市政技术》2024年第8期78-84,92,共8页Journal of Municipal Technology

基　　金：云南省交通运输厅科技创新示范项目(云交科教便【2021】48号)。

摘　　要：高液限黏土质砾作为混合多相特殊路基填料,具有天然含水率高、亲水性强、施工难以压实等不良工程特性,如何通过控制碾压参数来确保路基的压实质量成为高液限黏土质砾能否直接作为路基填料的关键问题。为此,以西南地区某高速公路典型的高液限黏土质砾为研究对象,系统研究了与高液限黏土质砾路基结构设计和填料需求相匹配的压实施工技术,提出了基于路基平衡含水率和长期性能的高液限黏土质砾路基压实质量控制标准与碾压参数。研究结果表明:通过控制压实机械、碾压方式、碾压遍数、松铺厚度、碾压含水率等碾压参数,高液限黏土质砾可直接用作下路堤填料;高液限黏土质砾路基的压实度控制标准应不低于85%,碾压含水率宜控制在35%以内;压实机械以14 t的中型压路机为宜,碾压方式以静压或静压+弱振为主;碾压遍数不少于3遍,应在填料明显软弹前停止碾压;松铺厚度不宜超过25 cm。路基在经历约6个月自然沉降期后趋于稳定,工程质量可以得到保证。研究成果可为高液限黏土质砾的合理有效利用提供理论和技术支撑。As a mixed multiphase special roadbed filler,high liquid limit clay gravel has adverse engineering characteristics such as high natural moisture content,strong hydrophilicity,and difficulty in compaction during construction.How to control the compaction parameters to ensure the compaction quality of the roadbed has been a key issue whether high liquid limit clay gravel can be directly used as roadbed fller.Therefore,taking a typical high liquid limit clay gravel on a highway in the southwest region of China as the research object,the compaction construction technology that matched the structural design and filling requirements of the high liquid limit clay gravel roadbed was systematic studied to propose a compaction quality control standard and rolling parameters for the high liquid limit clay gravel roadbed based on the equilibrium moisture content and long-term performance of the roadbed.The research results indicate that high liquid limit clay gravel can be directly used as filling material for lower embankments by controlling compaction parameters such as compaction machinery,compaction method,number of compaction passes,loose paving thickness,and compaction moisture content;The compaction control standard for high liquid limit clay gravel subgrade should not be less than 85%,and the compaction moisture content should be controlled within 35%;It is recommended to use a medium-sized 14 ton compaction machinery,and the compaction method should mainly be static pressure or static pressure+weak vibration;The number of rolling passes should not be less than 3 times,and the rolling should be stopped before the flling material becomes noticeably soft and elastic;The thickness of loose paving should not exceed 25 cm.After about 6 months of natural settlement period,the roadbed tends to stabilize and the engineering quality can be guaranteed.The research results can provide theoretical and technical support for the rational and effective utilization of high liquid limit clay gravel.

关 键 词：高液限黏土质砾 压实质量控制标准 碾压参数 沉降控制 

分 类 号：U416.1[交通运输工程—道路与铁道工程]