[1]朱小军,赵学亮,龚维明,等.复合地基垫层破坏模式的试验研究与数值模拟[J].东南大学学报(自然科学版),2013,43(3):629-633.[doi:10.3969/j.issn.1001-0505.2013.03.033]
 Zhu Xiaojun,Zhao Xueliang,Gong Weiming,et al.Experimental study and numerical simulation of cushion failure mode in composite foundation[J].Journal of Southeast University (Natural Science Edition),2013,43(3):629-633.[doi:10.3969/j.issn.1001-0505.2013.03.033]
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复合地基垫层破坏模式的试验研究与数值模拟()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第3期
页码:
629-633
栏目:
土木工程
出版日期:
2013-05-20

文章信息/Info

Title:
Experimental study and numerical simulation of cushion failure mode in composite foundation
作者:
朱小军1赵学亮1龚维明1徐国平2
1东南大学土木工程学院, 南京 210096; 2中交公路规划设计院有限公司, 北京 100088
Author(s):
Zhu Xiaojun1 Zhao Xueliang1 Gong Weiming1 Xu Guoping2
1School of Civil Engineering, Southeast University, Nanjing 210096, China
2CCCC Highway Consultants Co., Ltd., Beijing 100088, China
关键词:
复合地基 碎石垫层 破坏模式 颗粒流 数字照相
Keywords:
composite foundation gravel cushion failure mode particle code digital photogrammetry
分类号:
TU473
DOI:
10.3969/j.issn.1001-0505.2013.03.033
摘要:
为了研究复合地基中不同厚度碎石垫层的破坏机理,在室内模型试验中,利用数字图像无标点量测技术,研究了复合地基碎石垫层的变形场与变形模式,得到了碎石垫层的变形范围、滑动面位置与形状,再现了碎石垫层破坏形成完整破坏滑移线的全过程.通过开发颗粒流程序,模拟室内模型试验中碎石垫层在加载过程中的破坏过程,并与模型试验结果进行了对比.结果表明:当垫层厚度小于桩径时,桩身中性点位置集中于0.2~0.4倍桩长处,垫层发生局部剪切破坏;当垫层厚度大于桩径时,桩身中性点位置集中于0.7~0.9桩长处,垫层发生整体剪切破坏.刚性桩复合地基碎石垫层破坏机理的揭示对于优化复合地基碎石垫层的设计具有重要的参考价值.
Abstract:
In order to study the failure mechanism of gravel cushion with different thickness in composite foundation, digital speckle correlation technique was used to in laboratory experiments study the deformation fields and modes of gravel cushion in composite foundation. The deformation scope, sliding position and shape of the gravel cushion were calculated. The whole process of the complete slip line caused by the cushion failure was observed. Particle flow code was developed to simulate the failure process of gravel cushion during the loading procedure. The experimental results were compared with the numerical analysis results. The comparison results show that when the cushion thickness is less than the pile diameter, the neutral point position of pile locates at the 20% to 40% of the pile length and the failure mode of cushion belongs to local shearing failure. When the cushion thickness is more than the pile diameter, the neutral point position of pile locates at the 70% to 90% of pile length and the failure mode of cushion belongs to general shearing failure. The revelation of the failure mechanism of gravel cushion in composite foundation with rigid piles has an important reference value for optimizing the design level of rigid composite foundation gravel cushion.

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备注/Memo

备注/Memo:
作者简介: 朱小军(1987—),男,博士生;赵学亮(联系人),男,博士,讲师,Xueliang_zhao@yahoo.com.cn.
基金项目: “十二五”国家科技支撑计划资助项目(2011BAG07B01)、国家重点研究基础发展计划(973计划)资助项目(2013CB036304)、国家自然科学基金资助项目(51079030).
引文格式: 朱小军,赵学亮,龚维明,等.复合地基垫层破坏模式的试验研究与数值模拟[J].东南大学学报:自然科学版,2013,43(3):629-633. [doi:10.3969/j.issn.1001-0505.2013.03.033]
更新日期/Last Update: 2013-05-20