考虑胶结强度正态分布下砂土力学特性离散元模拟

蒋明镜; 廖优斌; 刘蔚; 谭亚飞鸥

doi:10.11779/CJGE2016S2001

考虑胶结强度正态分布下砂土力学特性离散元模拟 English Version

蒋明镜^{1, 2, 3},
廖优斌^{1, 3},
刘蔚^{2, 3},
谭亚飞鸥^{1, 3}

1. 上海理工大学土木工程系,上海 200093;
2. 同济大学地下建筑与工程系,上海 200092;
3. 同济大学岩土及地下工程教育部重点实验室,上海 200092

基金项目: 国家杰出青年科学基金项目（51025932）

详细信息

作者简介:
蒋明镜(1965- ),男,教授,博士生导师,主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏微观试验、本构模型和数值分析研究。E-mail: mingjing.jiang@tongji.edu.cn。

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出版历程
- 收稿日期: 2016-05-18
- 发布日期: 2016-10-19

DEM simulation of mechanical behaviour of cemented sand under normal distribution of cementation strength

JIANG Ming-jing^{1, 2, 3},
LIAO You-bin^{1, 3},
LIU Wei^{2, 3},
TAN Ya-fei-ou^{1, 3}

1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. Key Laboratory of Geotechnical and Underground Engineering Ministry of Education, Tongji University, Shanghai 200092, China;
3. Dept of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 自密实混凝土在重力坝施工过程中受施工工艺、施工质量及施工环境等因素的影响,砂土颗粒间的胶结强度可能各不相同。为研究不同胶结强度的胶结砂土的力学特性,借助PFC^3D自带的微观胶结模型,将胶结砂土中的胶结强度的分布定义为正态分布,并系统地分析了在不同方差和胶结含量下胶结砂土的力学特性。研究表明,胶结试样在数值试验中表现出应力应变软化特性及体变剪胀性,且随着胶结含量的增大,软化及剪胀程度提高;当偏应力达到峰值时,随着轴向应变的增大,体变由剪缩变化为剪胀。在假定的胶结砂样的胶结强度服从正态分布的情况下,峰值应力随着胶结含量成线性增大,但正态分布方差的变化对胶结砂样强度的影响不大。
- 胶结砂土 /
- 离散单元法 /
- 胶结强度 /
- 力学特性
Abstract: Influenced by construction technology, quality and environment in the construction process of rock-fill concrete gravity dam, natural cementation sands may have different cementation strengths between the sand particles. By using the microscopic model BPM of PFC^3D, the distribution of the bond strength in cemented sand is defined as the normal distribution to study the mechanical properties of cemented soil with different bond strengths. The mechanical properties of cemented sands under different contents and variances are analyzed. The results show the strain softening and shear dilatation characteristics. And with the increase of cement contents, softening and dilatancy increase. When the deviatoric stress reaches the peak value, with the increase of the axial strain, the change of the volume is reduced by the shear contraction. The volumetric strain is changed from the shear shrinkage to dilatancy. With the assumption that the cementing of sample under the normal distribution cementation strength, the peak stress linearly grows with cement content, but charge of the normal distribution variances has a little influence on the cementation of strength.
- cemented sand /
- distinct element method /
- cementation strength /
- mechanical behaviour

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参考文献(12)

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