高速铁路膨胀土路堑基床换填厚度试验研究

Test Study on High-speed Railway Cutting Bedding Replacement Thickness in Expansive Soil Areas

结合合肥-南京新建时速200km客货共线的建设,在膨胀土路堑地段进行了动载试验,得到了模拟荷载作用下路基动应力沿深度的衰减规律、弹性变形和塑性变形,并从强度、变形等方面探讨了膨胀土路堑的换填厚度,为高速铁路膨胀土路堑地段设计提供了依据。

Combined with the construction of a passenger and freight railway at the speed of 200 km/h, and based on the dynamic load test of the cutting section in expansive soil areas, the attenuation law of subgrade dynamic stress along different depths, elastic and total plastic deformation under the analog load are obtained. The cutting replacement thickness in expansive soils is also studied with the analysis on subgrade strength and deformation. This will provide a basis for designing high-speed railway cutting in expansive soil areas.