Critical load position for cavities beneath CRCP slab under vehicle loading

In order to study the critical load position that causes cavities beneath the continuously reinforced concrete pavement（ CRCP） slab under vehicle loading, the elliptical load is translated into the square load based on the equivalence principle.The CRCP slab is analyzed to determine the cavity position beneath the slab under vehicle loading. The influences of cavity size on the CRCP slab＇s stress and vertical displacement are investigated. The study results showthat the formation of the cavity is unavoidable under traffic loading, and the cavity is located at the edge of the longitudinal crack and the slab corner.The cavity size exerts an obvious influence on the largest horizontal tensile stress and vertical displacement. The slab corner is the critical load position of the CRCP slab. The results can be used to assist the design of CRCP in avoiding cavities beneath slabs subject to vehicle loading.

铁路货车转向架模拟落车机的研制

采用铁路货车转向架模拟落车机进行货车转向架落成模拟和检查,能有效模拟货车空车落成时的工作状态,使转向架落成检查更加科学合理。将此技术应用于铁路检修工作中某个指定工序中,以此来提高铁路检修作业的自动化及技术水平,提高铁路货车运行的安全性。