秦沈客运专线路涵过渡段动应力测试与分析
Dynam ic StressM easurement and Analysis of Subgrade-Culvert Transition Section on Q inhuangdao-Shenyang Passenger SpecialLine
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摘要: 对秦沈客运专线DK49+689. 0~DK49+700. 7路涵过渡段进行了动应力测试,分析了动土压力与列车 速度的关系、沿线路纵向分布以及随深度的变化.结果表明:动土压力随列车速度提高而增大,当列车速度超过 220 km /h时,动土压力基本趋于稳定,但始终大于准静态土压力;随深度增大,动土压力迅速衰减,趋于准静态 土压力.此外,动土压力还受路基结构的影响,涵洞顶路基的动土压力明显大于一般路基的动土压力.Abstract: Dynamic soil stress of a subgrade-culvert transition section from DK49+689. 0 toDK49+ 700. 7 on theQinhuangdao-Shenyang passenger special linewasmeasured and its influencing factors, including train speed, structural changes and soil depth, were analyzed. The results indicate that dynamic earth pressure trends to rise with the increase of train speed. When train speed exceeds 220 km/h, dynamic earth pressure trends to be unchanged, but it is always bigger than the earth pressure ofquasi-static state. In addition, dynamic earth pressure attenuates rapidlywith the increase of soil depth, approaching to the quasi-static earth pressure. Furthermore, it is also related to the structure of subgrade andmuch greater over the culvert than in normal subgrade.
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