›› 2014, Vol. 35 ›› Issue (6): 1664-1670.

• Geotechnical Engineering • Previous Articles     Next Articles

Dynamic response analysis of column-net structure subgrade and reinforced cushion under cyclic loading

ZHANG Chong-lei1, 2, JIANG Guan-lu1, 2, YUAN Sheng-yang1, 2, WANG Wei1, 2   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2013-03-19 Online:2014-06-10 Published:2014-06-20

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Abstract: Four large-scale model tests are made to monitor the dynamic response of column-net structure subgrade. The influence of loading level, loading frequency and loading times on the dynamic parameters, the pile-soil load sharing and the strains of geogrid are studied. The results show that the dynamic stress and the dynamic acceleration increase fast in the bed of subgrade and underneath trend towards stability with depth after rainfall. During the stage of cyclic loading, the stress concentration ratio increases slowly. After rainfall, the stress concentration ratio can decrease about 56.4 % to 79.5 %. Compared with the construction stage, the strains of geogrid increase and the transverse distributions remain the same form after cyclic loading. The strains of geogrid among four piles within the width of subgrade increase fast after the formation of soil arching. The peak value points of strains of geogrid appear in the centre of the slope and subgrade, which emerges as W-shape in the cross-section. The strains of geogrid between two piles increase from the centre to the slope toe of subgrade, which emerges as stair-shape. The differences of strains of geogrid between the slope and the width of subgrade decrease gradually after the formation of soil arching.

Key words: column-net structure subgrade, dynamic response, geogrid strain, cyclic loading, large-scale model test

CLC Number: 

  • TU 413.6+2
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