关键词: 高速铁路, 红层填料, 基床表层, 水泥稳定级配碎石, 动态变形

Abstract:

In order to cater for the operation requirements of high speed train, it is necessary for subgrade of track to be high stability and comfort; as the subgrade of track, strength and stiffness of roadbed structure, is very high and at the same time its stability and durability is very good. However, as for red bed mudstone, its engineering properties is bad as follows: it is easy to collapse and its strength is very low, which belongs to weak rock. As the stuffing of surface layer of subgrade bed, its stiffness is apparently lack, so in order to make up for the shortage of surface layer of subgrade bed, it is necessary to add a layer of cement stabilized grading crushed stones; to verify the effects of these disposal measures and guide the design and construction works, through dynamic full-scale model test in simulating actual loading conditions; it is indicated that by the use of cement stabilized grading crushed stones as stuffing of subgrade bed surface layer, static and dynamic deformation significantly can be reduced; and what’s more, permanent deformation of subgrade bed can be also reduced; and the stability of the track structure can be enhanced.

Key words: high speed railway, red bed stuffing, surface layer of subgrade bed, cement stabilized grading crushed stones, dynamic deformations