期刊论文

Mechanical Properties and Meso Mechanical Performance Evaluation of Coarse-grained Soil Fillers Based on Dynamic Triaxial CT Test

He, Zhong-Ming(hezhongming45@126.com)

中文

中国公路学报

1001-7372

2018

31

11

42-50

10.3969/j.issn.1001-7372.2018.11.005

51678073:国家自然科学基金 51508042:国家自然科学基金

本校为通讯机构

在多重环境因素长期作用下,粗粒土路基填料的动力特性会发生改变,目前对不同荷载频率、压实度及含水率下粗粒土填料的长期稳定性能尚缺乏统一认识。为了研究以上因素作用下粗粒土填料长期动力特性,采用大型动静三轴仪器开展粗粒土填料的三轴试验,同时运用工业CT对三轴试验前后2个阶段的试样进行断层扫描,分析不同荷载频率、压实度及含水率对粗粒土填料动力特征与损伤演化的影响规律。研究结果表明:循环荷载达到1 000次之前,为粗粒土填料颗粒之间的挤密阶段,以颗粒间的挤密压缩为主,横向膨胀为辅,颗粒间压缩挤密引起的密度增加量远大于试样横向膨胀变形引起的密度减小量;当循环荷载增加到1 000次...

The dynamic characteristics of coarse-grained soil subgrade fillers change under long-term multiple environmental factors. At present, there is a lack of clear understanding on the long-term stability of coarse-grained soil fillers under different loading frequencies, compaction degrees, and moisture content. To study the long-term dynamic characteristics of subgrade-based coarse-grained fillers under these conditions, a large-scale static and dynamic triaxial equipment was used to conduct triaxial tests of coarse-grained soil. Simultaneously, ...