黄土路基振陷性试验研究
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摘要
在长期车辆动荷载的作用下,铁路路基及基床将产生不可恢复的塑性变形(振陷),成为轨下系统工后沉降的主要部分。对路基黄土进行了动三轴试验,并通过数值模拟,分析了郑州—西安客运专线CK451+400处的路基总振陷量。结果表明:在列车动载作用下,路基的总振陷量达59 mm,不能满足车辆平稳运行的要求,需要对地基进行处理。
Under the action of dynamic load of vehicles for long time,railway subgrade and its foundation bed are subjected to unrecoverable plastic deformation(vibration subsidence) which becomes main part of postconstruction settlement of system under rail.Dynamic triaxial test was carried out against subgrade loess,and with numerical simulation,the total vibration subsidence of subgrade at CK451 + 400 of Zhengzhou-Xi'an Passenger Dedicated Line was analyzed.The result shows that under the action of dynamic load of train,the total vibration subsidence of the subgrade has reached 59mm,not meeting the requirement of vehicle running stably,thus the foundation is required to be treated.
Under the action of dynamic load of vehicles for long time,railway subgrade and its foundation bed are subjected to unrecoverable plastic deformation(vibration subsidence) which becomes main part of postconstruction settlement of system under rail.Dynamic triaxial test was carried out against subgrade loess,and with numerical simulation,the total vibration subsidence of subgrade at CK451 + 400 of Zhengzhou-Xi'an Passenger Dedicated Line was analyzed.The result shows that under the action of dynamic load of train,the total vibration subsidence of the subgrade has reached 59mm,not meeting the requirement of vehicle running stably,thus the foundation is required to be treated.
引文
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[2]周健.土动力学理论与计算[M].北京:中国建筑工业出版社,2001.
[3]何光,朱鸿博.黄土振陷研究[J].岩土工程学报,1990,12(6):99-103.
[4]王兰民,等.黄土动力学[M].北京:地震出版社,2003.
[5]凌建明,王伟,邹洪波.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.
[6]Seed,H.B.&Lee,K.L.Liquefaction of saturated sands during cyclicloading[J].Journal of the Soil Mechanics and Foundations,1966,92(6):105-134.
[7]Thiers G R,Seed H B.Strength and stress-strain characteristics of clayssubjected to seismic loading conditions[C].Viabration Effects ofEarthquaks on Soils and Foundatins,ASTM STP450,1969:32-56.
[8]铁建设[2003]13号京沪高速铁路设计暂行规定[S].北京:中国铁道出版社,2003.
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