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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第4期    总第60期    2014年8月

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文章编号:1672-7029(2014)04-0068-05
砾类土在循环荷载作用下的变形影响因素试验研究
刘大鹏1,杨晓华1, 王婧2,王永威1,陈志敏3

(1.长安大学 公路学院,陕西 西安 710064;
2.甘肃建筑职业技术学院 交通工程系,甘肃 兰州 730050;
3.兰州交通大学 土木工程学院,甘肃 兰州 730070
)

摘 要: 砾类土是新疆铁路和公路常用的路基填料,为了控制和减小砾类土路基的沉降,首先需要明确各因素对该类路基在循环荷载作用下的变形影响规律。通过动三轴试验研究围压、初始静偏应力、循环荷载作用频率、循环荷载大小和固结比对砾类土累计塑性变形的影响规律,得出其累计塑性应变随着初始静偏应力、循环荷载大小的增加而增大,随着围压、荷载作用频率和固结比增加而减小。同时计算各影响因素对累计塑形应变的极差,得出影响因素对累计塑形应变影响的大小。在路基施工时,可以通过提高路基的围压,同时使路基充分固结来减小路基的营运沉降。提出一种针对砾类土应变较小时的塑性累计变形模型,并验证模型的正确性,可为新疆砾类土路基的设计和施工提供参考。

 

关键字: 砾类土;塑性应变;围压;静偏应力;循环荷载;固结比

Study on influence factors of gravel soil accumulative deformation under cyclic loading
LIU Dapeng1, YANG Xiaohua1, WANG Jing2, WANG Yongwei1, CHEN Zhimin3

1.School o f Highway, Changan University, Xian 710064, China; 
2. Department of Traffic Engineering, Gansu Construction Vocational Technical College, Lanzhou 730050, China; 
3.School of Civil Engineering, Lanzhou Jiaotong University , Lanzhou 730070, China

Abstract:Gravel soil is the commonly used railway and highway subgrade filling in Xinjiang. In order to control and reduce settlement of embankment, it should be firstly confirmed that the change law of influencing factors on the gravel soil roadbed accumulative deformation under cyclic loading. The effect of confining pressure, the initial static deviatoric stress, cyclic loading frequency, cyclic loading value and consolidation ratio on cumulative plastic strain of gravel soil was investigated through the dynamic triaxial tests. The accumulative deformation increases with the increasing value of initial static deviatoric stress and the cyclic loading; however, it shows an opposite trend with the increase of confining pressure, cyclic loading frequency and consolidation ratio. At the same time, the cumulative plastic strain range under different influencing factors was calculated and their impact on the cumulative plastic strain were obtained. Thus in the subgrade construction, increasing confining pressure and consolidation ratio of gravel soil subgrade can be adopted to reduce operation settlement. A new model of gravel soil cumulative plastic strain arming at small plastic deformation was put forward and the correctness of the model was validated. The research results can provide reference for the design and construction of gravel soil subgrade in Xinjiang.

 

Key words: gravel soil; plastic strain; confining pressure; static deviatoric stress; cyclic loading; consolidation ratio

ISSN 1672-7029
CN 43-1423/U

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