Abstract：Research purposes：The thiner ballast depth can not meet the requirements of track structure’s bearing capacity，while the thicker ballast depth will increase construction costs，It is very important to choose a reasonable ballast depth in overseas EPC projects．According to the operation terms in Tinaco-Anaco Railway line in Venezuela， the rate of residual track deformation is regarded as the value to evaluate deteriortion of the track geometrical state and maintaneance work in this paper．In order to define a best track depth from four kinds of ballast depth，the track quality is studied with respect to not only the bearing capacity of subgrade and track stiffness，but also the track maintaneance．
Research conclusions：(1)The track stiffness increases with the increasement of the ballast depth，but the increasement Is small．The ballast depth has little influence on the track elasticity．(2)With the increase of the ballast depth，the stress on the subgrade surface is reducing，when the ballast depth reaches 350 mm，the stress on the subgrade surface is 0．12 MPa，the safety coefficient has already been up to 1．5．(3)With the increase of the ballast depth，the acceleration of ballast is reducing，SO it is the same with the rate of residual track deformation．With other conditions no changing， When the ballast depth rises from 250 mm to 350 mm，the rate of residual track deformation reduces by 66．12％，which will reduce the maintaineance work greatly，and prolong the service life of track bed．(4)It is suggested that the ballast depth adopts 350 mm in the Tinaco—Anaco Railway line．(5)The research method and conclusion can be applied to similar projects．
杨吉忠，韩义涛，潘自立. 委内瑞拉Tinaco-Anaco铁路有砟道床厚度研究[J]. 铁道工程学报, 2013, 30(12): 33-35.
YANG Ji-zhong，HAN Yi-tao，PAN Zi-li. Research on the Ballast Depth in Tinaco-Anaco Railway Line. 铁道工程学报, 2013, 30(12): 33-35.
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2013, Vol. 30 
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