随着铁路运量和行车密度的增大,行车速度的提高,作为轨下基础结构的混凝土轨枕,已不能满足车辆对轨道附加的动荷载,致使轨枕严重损坏,线路维修工作量增大。 仅据我段管辖的正线150kmS—1型预应力混凝土轨枕的调查,失效率达17％,其中横裂占失效率的44.4％,因轨下正弯矩造成横裂的 With the increase of railway traffic and driving density and the increase of driving speed, the concrete sleeper as an under-track foundation can no longer meet the additional dynamic load of the vehicle on the track, causing the sleeper to be seriously damaged and the workload of line maintenance to increase. According to the survey of the 150kmS-1 type prestressed concrete sleepers under the jurisdiction of the section, the failure rate is 17%, of which the transverse cracks account for 44.4% of the failure rate. The transverse cracks due to the normal bending moment