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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第8期    总第264期    2016年8月

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文章编号:1672-7207(2016)08-2715-08
基于颗粒离散元的抗滑桩土拱效应分析
韩同春1, 2,邱子义1, 2,豆红强3

(1. 浙江大学 滨海与城市岩土工程研究中心,浙江 杭州,310058;
2. 浙江大学 软弱土与环境土工教育部重点实验室,浙江 杭州,310058;
3. 福州大学 环境与资源学院,福建 福州,350116
)

摘 要: 运用 YADE离散元软件对三维空间下的土拱效应进行研究。探讨在不同土层埋深、桩间距及土颗粒不均匀分布等影响因素下的土拱效应发展及变化。研究结果表明:浅层土中的土拱较之深层土中的土拱强度较差,破坏也有所提前;随着桩间距的增大,土拱效应的影响将会减弱,并且减弱的速度逐渐变慢;土颗粒粒径分布的不均匀性增强会使得土拱的形成提前,但是对加载过程中,桩上水平力分担比峰值的影响不大。

 

关键词: 土拱效应;YADE离散元;三维模型;土层深度;桩间距变化;土体不均匀性

Soil arching effect between anti-slide piles based on YADE discrete element method
HAN Tongchun1, 2, QIU Ziyi1, 2, DOU Hongqiang3

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education,Zhejiang University, Hangzhou 310058, China;
3. College of Environment and Resources, Fuzhou University, Fuzhou 350116, China

Abstract:YADE discrete element method was used to analyze the soil arching effect between anti-slide piles. The depth of soil layers, space between anti-slide piles and variation of soil particles diameters were given into consideration. The results show that at the different depths of soil layers, the developing of soil arching is different. When the depth of soil layer is shallow, the strength of soil arching is lower and the soil arching is destroyed early. When the depth of soil layer is deep, the strength of soil arching is higher and the soil arching is destroyed later. The arch rise decreases with the increase of the depth of soil layers. Space increasing between anti-slide piles weakens soil arching effect and the speed of weakness of soil arching effect is slower and slower. The increase of range of soil particles diameters distribution lets soil arching take shape in advance, but has little influence on the maximum horizontal load sharing ratio of piles in the loading process.

 

Key words: soil arching effect; YADE discrete element method; three-dimensional numerical model; depth of soil layers; variation of space between anti-slide piles; variation of soil particles diameters

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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