Cumulative Deformation Behavior of Coarse-Grained Red Mudstone Soil under Cyclic Loading

被引:2
作者
Xu, Hua [1 ]
Zhao, Futang [2 ]
Hu, Yao [1 ]
Gao, Feng [3 ]
Zheng, Yewei [2 ]
机构
[1] Chengdu Univ Technol, Coll Environm & Civil Engn, Chengdu 610059, Peoples R China
[2] Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
[3] Changsha Univ Sci & Technol, Natl Engn Res Ctr Highway Maintenance Technol, Sch Traff & Transportat Engn, Changsha 410114, Peoples R China
关键词
Red mudstone; Cyclic triaxial test; Cyclic loading; Cumulative strain; Cyclic stress ratio; UNBOUND GRANULAR-MATERIALS; PERMANENT DEFORMATION; DYNAMIC-BEHAVIOR; MECHANICAL-BEHAVIOR; FOUNDATION; SUBGRADE; STRAIN; LIME; ROAD;
D O I
10.1061/IJGNAI.GMENG-9755
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Red mudstone is a problematic soil that is easily subjected to weathering, disintegrating, and swelling. In this study, a series of large-scale cyclic triaxial tests were performed to investigate the cumulative deformation behavior of red mudstone clay mixed with weathered red mudstone gravel as an improved coarse-grained red mudstone soil (IRMS). The influences of compaction moisture content and confining pressure were investigated. The cyclic loading was applied from 25 to 225 kPa with an increment of 25 kPa and 1,000 or 2,000 cycles for each stage at a frequency of 2 Hz. The experimental results indicate that the strains at the onset of failure are approximately 1% for the optimal moisture content (OMC) with the number of cycles N = 14,000-16,000, and the strains are approximately 1% for the moisture content 2% dry of OMC with N = 12,000-14,000, while the strains exceed 10% for the moisture content 2% wet of OMC with N = 3,000-4,000. The cumulative strain decreases with increasing confining pressure from 20 to 50 kPa, but the influence becomes more significant under higher dynamic stress. A prediction model is proposed for the evolution of cumulative strain under cyclic loading. The IRMS could be used as a construction material for railway subgrade with proper control of field compaction moisture content.
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页数:12
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