公路交通荷载下地基土的应力路径研究
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摘要
交通荷载是引起的公路路基沉降的主要因素,在我国公路建设中也一直是设计及施工人员持续关注的对象。尤其是东南沿海地区,软土地基分布广泛,交通荷载带来的工后沉降极易引起路面的不均匀沉降,致使路面结构损坏,对公路维护及行车安全舒适带来极大挑战。土单元的应力路径可以较为直观的反应行车-路面结构体系的动力响应情况,文章通过数值模拟,针对不同行车车速、土单元不同位置、不同的地基模量,对道路中心线下方及行车荷载下方的土单元应力路径进行研究,探讨了这些变量对地基土应力路径的影响规律。
The traffic load is the main cause of the subgrade settlement of highway. It has always been the object of continuous attention of design and construction personnel in the construction of highways in China.Especially in the southeast coastal areas, the soft soil foundation is widely distributed. The post-construction settlement caused by traffic load can easily cause uneven settlement of the road surface, resulting in damage to the road surface structure, which poses great challenges to road maintenance and driving safety and comfort.The stress path of the soil element can intuitively reflect the dynamic response of the traffic-road structure system. Through numerical simulation, this paper aims at different driving speeds, different locations of soil units, and different ground modulus, below the centerline of the road and under the driving load. The soil element stress path was studied to investigate the influence of these variables on the stress path of the foundation soil.
The traffic load is the main cause of the subgrade settlement of highway. It has always been the object of continuous attention of design and construction personnel in the construction of highways in China.Especially in the southeast coastal areas, the soft soil foundation is widely distributed. The post-construction settlement caused by traffic load can easily cause uneven settlement of the road surface, resulting in damage to the road surface structure, which poses great challenges to road maintenance and driving safety and comfort.The stress path of the soil element can intuitively reflect the dynamic response of the traffic-road structure system. Through numerical simulation, this paper aims at different driving speeds, different locations of soil units, and different ground modulus, below the centerline of the road and under the driving load. The soil element stress path was studied to investigate the influence of these variables on the stress path of the foundation soil.
引文
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[6] Grundmann H, Lieb M, Trommer E. The response of alayered half-space to traffic loads moving along its surface[J].Archive of Applied Mechanics,1999,69(1):55-67.
[7] Xuecheng,Bian,Yunmin,Chen. An explicit time domainsolution for ground stratum response to harmonic moving load[J]. Acta Mechanica Sinica,2006,22(5):469-478.
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[9] Kaynia A M,Madshus C,Zackrisson P. Ground vibrationfrom high-speed trains:Prediction and countermeasure[J].Journal of Geotechnical&Geoenvironmental Engineering,2000,126(126):531-537.
[10]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[11]黄仰贤.路面分析与设计[M].人民交通出版社,1998.
[2]吕晓聪,宋剑秋.机场跑道软基加固过程中的沉降分析[J].工程技术(文摘版),2016(3):251.
[3]凌建明,王伟,邬洪波.行车荷载作用下湿软路基残余变形的研究[J].同济大学学报(自然科学版),2002,30(11):1315-1320.
[4]边学成,陈云敏.列车荷载作用下轨道和地基的动响应分析[J].力学学报,2005,37(4):477-484.
[5] Barros F C P D, Luco J E. Response of a layered vis-coelastic half-space to a moving point load[J]. Wave Motion,1994,19(2):189-210.
[6] Grundmann H, Lieb M, Trommer E. The response of alayered half-space to traffic loads moving along its surface[J].Archive of Applied Mechanics,1999,69(1):55-67.
[7] Xuecheng,Bian,Yunmin,Chen. An explicit time domainsolution for ground stratum response to harmonic moving load[J]. Acta Mechanica Sinica,2006,22(5):469-478.
[8] Sheng X, Jones C J C, Petyt M. GROUND VIBRA-TION GENERATED BY A LOAD MOVING ALONG ARAILWAY TRACK[J]. Journal of Sound&Vibration, 1999,228(1):129-156.
[9] Kaynia A M,Madshus C,Zackrisson P. Ground vibrationfrom high-speed trains:Prediction and countermeasure[J].Journal of Geotechnical&Geoenvironmental Engineering,2000,126(126):531-537.
[10]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[11]黄仰贤.路面分析与设计[M].人民交通出版社,1998.