摘要
目前采用土工格栅处治桥涵台背路基的差异沉降效果良好,为了提高土工格栅在路基处治中的利用率,本工作创新性地将行车舒适性指标引入涵洞台背路基差异沉降控制。基于人⁃车⁃路耦合系统模型,分析了不同车型和不同车辆速度对人体最大竖向加速度的影响,通过多次回归计算得到不同车速下人体竖向加速度与差异沉降值的相关关系,提出折线型路基模式下基于行车舒适性的差异沉降控制标准;通过建立涵洞台背路基数值计算模型,计算分析了不同土工格栅铺设方式、密度、位置、长度和格栅模量下涵洞路基顶面的差异沉降分布规律,提出了基于行车舒适性的土工格栅处治涵洞路基差异沉降布设方案,并通过现场试验验证了方案的有效性。研究结果表明:格栅长度是影响涵洞台背路基处治效果的主要因素,所提出的基于舒适性的涵洞台背路基土工格栅铺设方案,可以显著提高格栅的利用率,有效控制路基差异沉降。研究成果可以为山区涵洞台背路基土工格栅铺设提供理论价值与借鉴意义。
At present, geogrid is used to treat the differential settlement of the bridge and culvert subgrade, which has been proved effective. In order to improve the utilization rate of geogrid in the subgrade treatment, this paper innovatively introduces the driving comfort index into the differential settlement control of the culvert retailing backwall subgrade. Based on the human-vehicle-road coupling system model, the influence of different types vehicle and different vehicle speeds on the maximum vertical acceleration of the human body was analyzed. The correlation between the vertical acceleration of the human body at different vehicle speeds and the differential settlement value was obtained by multiple regression calculations, and the subgrade differential settlement control standard in polyline subgrade mode based on driving comfort was proposed. By establishing the numerical calculation model of the culvert retailing backwall subgrade, the differential settlement of the top surface of the culvert subgrade under different geogrid laying methods, density, location, length and grid modulus was calculated and analyzed. The differential settlement layout scheme of culvert subgrade treated by geogrid based on driving comfort was proposed, and the scheme was verified by field test. The research results show that the length of the grid is the main factor affecting the treatment effect of the subgrade of the culvert. The proposed comfort-based culvert retailing backwall subgrade geogrid laying scheme can significantly improve the utilization of the grid and effectively control the differential settlement of the subgrade. The research results can provide theoretical value and reference significance for the laying of culvert retailing backwall geogrid in the mountainous area.
作者
丁龙亭
王选仓
付林杰
张梦媛
苟想伟
DING Longting;WANG Xuancang;FU Linjie;ZHANG Mengyuan;GOU Xiangwei(School of Highway,Chang'an University,Xi'an 710064,China;Tianjin Municipal Engineering Design and Research Institute,Tianjin 300392,China;Gansu Luqiao Third Highway Engineering Co.,Ltd.,Lanzhou 730030,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第4期4079-4087,共9页
Materials Reports
基金
河北省交通运输厅科研项目(JD⁃2020018)
甘肃省科技重大专项(1302GKDA009)
甘肃省交通运输厅科技项目(2016⁃05)
甘肃路桥建设集团科技项目(2018⁃BXSG⁃QT17)。
关键词
路基工程
涵洞路基
行车舒适性
土工格栅
差异沉降
subgrade engineering
culvert subgrade
driving comfort
geogrid
differential settlement
