重载铁路下穿京沪高铁的路基结构设计研究

Study on Design of Subgrade Structure of Beijing-Shanghai Express Railway Undercrossing Heavy-haul Railway

山西中南部重载铁路与京沪高铁在山东泰安交叉,由于重载铁路设计轴重达30 t,动应力影响深度大,采用何种路基结构型式,避免外荷对高铁桥墩的影响,成为控制线路安全通过高铁的关键。同时,该处线路北临大汶河,采用何种防水路基结构,以满足大汶河百年洪水位防洪要求,也是设计需考虑的重要因素。研究结果表明:采用路堤式U型槽路基结构型式,取得了预期效果。

The heavy-haul railway in the middle south of Shanxi crosses over Beijing-Shanghai Express Railway at Taian, Shandong. Because the design axle of the heavy-haul railway has the weight up to 30 t with deep depth affected by dynamic stress, the type of the subgrade structure to be used to avoid the influence of external load on the pier of the Express Railway is the key to control the route passing the Express Railway safely. At the same time, the route is close to Dawen River in the north so that the type of water-proof subgrade structure to be used to meet the requirement of flood prevention according to the flood level in 100 years of Dawen River is the important factor that needs to be considered in the design as well. The study result shows that the embankment type U-shaped groove subgrade structure used gets the expected effect.