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在陇海线郑徐段200 km.h-1提速区段上对5座涵顶填方厚度为0.52~0.85 m的涵洞,采用160km.h-1提速列车分别在其上、下行线(上行铺设弹性轨枕,下行铺设普通轨枕)拉锯运行,实测和分析车辆、轨道、涵洞和路基动力响应的各种参数,并仿真分析200 km.h-1提速列车通过涵洞时的动力学性能。结果表明:在路基状态良好、道床厚度为30 cm以上时,不管铺设弹性轨枕与否,均能满足200 km.h-1提速列车运行安全性、平稳性和乘坐舒适性的要求;在填方厚度不足1.2 m的涵洞区段,枕下支承刚度存在不均匀现象,其程度受路基状态、涵洞跨度及结构形式的影响,路基状态良好地段的不均匀现象不明显,反之则比较突出;铺设弹性轨枕可调整枕下支承刚度,降低道床振动加速度,但轨枕垂向位移、振动加速度以及钢轨动弯应力有所增大;涵顶的填方厚度能够有效降低涵顶的振动幅值和动力系数,而弹性轨枕对涵顶的振动幅值和动力系数基本没有衰减作用。
Five culverts with 0.52-0.85 m culvert fillings on the 200 km-h-1 speed-up section of the Longhai section of Zhenglong section were constructed on the upper and lower lines Laying elastic sleepers and laying ordinary sleepers downwards) sawing, measuring and analyzing various parameters of vehicle, track, culvert and subgrade dynamic response, and simulating and analyzing the dynamic performance of 200 km.h-1 speed-raising train passing through culvert. The results show that the requirements of 200 km.h-1 speeding train running safety, ride comfort and ride comfort can be satisfied no matter whether the elastic sleepers are laid or not, when the roadbed is in good condition with the ballast bed thickness of 30 cm or more. In the culvert section with the thickness of less than 1.2 m, there is an uneven bearing stiffness of the suboccipital pillow. The degree of subaxial support stiffness is affected by the condition of the subgrade, the culvert span and the structure of the culvert. The non-uniform phenomenon of the sub- The sleepers can adjust the stiffness of the sub-support and reduce the vibration acceleration of the ballast, but the vertical displacements, vibration accelerations and dynamic bending stresses of the sleepers increase. The thickness of the culvert can effectively reduce the vibration amplitude and dynamic coefficient of the culvert, However, the elastic sleeper has almost no damping effect on the vibration amplitude and dynamic coefficient of culvert.