Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4913130 | Construction and Building Materials | 2017 | 10 Pages |
Abstract
Controlling settlement of ballastless track subgrade in special soil areas is an ongoing scientific problem in the construction and operation of high-speed railways-primarily because of the consolidation settlement of the ground soil, which is caused by additional stress from large loads. To reduce the subgrade weight and additional stress, the authors propose the use of lightweight foam concrete as subgrade filler, thereby controlling subgrade settlement in special soil areas. However, it remains unknown whether the ballastless track subgrade filled with lightweight foam concrete has a long-term dynamic stability under cyclic loads. To solve this problem, compressive strength and dynamic triaxial tests are conducted to analyse the static and dynamic strength of lightweight foam concrete. Then a large-scale model of a subgrade filled with lightweight foam concrete with target density of 650Â kg/m3 is established to determine its long-term performance under cyclic dynamic loads. The esults show that the strength of lightweight foam concrete with target density of 500-800Â kg/m3 can meet the requirements of both the static and dynamic conditions of ballastless track subgrade, and the ballastless track subgrade filled by lightweight foam concrete with target density of 650Â kg/m3Â has a good long-term dynamic stability under cyclic dynamic loads when a dynamic buffer layer with thickness of 0.5Â m is set between lightweight foam concrete layer and foundation slab.
Keywords
Related Topics
Physical Sciences and Engineering
Engineering
Civil and Structural Engineering
Authors
Jun-jie Huang, Qian Su, Wen-hui Zhao, Ting Li, Xiao-xi Zhang,