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中南大学学报(自然科学版)

Journal of Central South University

第43卷    第5期    总第213期    2012年5月

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文章编号:1672-7207(2012)05-1914-06
粗粒土初始各向异性弹塑性模型
褚福永1, 2,朱俊高1,赵颜辉1,何顺宾3

(1. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京,210098;
2. 丽水学院 土木工程学系,浙江 丽水,323000;
3. 中国水电顾问集团成都勘测设计研究院,四川 成都,610072
)

摘 要: 基于黏土的初始各向异性研究成果,提出一个适用于粗粒土的弹塑性模型。该模型屈服面为旋转的椭圆,采用考虑塑性体应变和塑性剪应变耦合的两个硬化参数,即表示屈服面大小的硬化参数kp和旋转硬化参数α。模型能较好地反映初始及后续各向异性状态下粗粒土的剪胀性。利用双江口堆石坝覆盖层砂卵砾石料,进行了K0固结排水剪和K0固结不排水剪大三轴试验,并用试验结果对模型进行了初步验证。研究结果表明:模型能够合理地预测粗粒土的变形和强度特性。

 

关键字: 初始应力状态;各向异性;弹塑性模型;粗粒土

An elastoplastic model for granular soil considering initial anisotropy
CHU Fu-yong1, 2, ZHU Jun-gao1, ZHAO Yan-hui1, HE Shun-bing3

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,
Hohai University, Nanjing 210098, China;
2. School of Civil Engineering, Lishui University, Lishui 323000, China;
3. Chengdu Design and Research Institute, Chengdu 610072, China

Abstract:On the basis of the former study on anisotropy of fine-grained soil, an elastoplastic model applicable for coarse-grained soil was proposed. The improved yield surface of this model is a rotational ellipse. Two hardening parameters which consider the plastic volumetric strain coupling to plastic shear strain are adopted in this model, that is, the hardening parameter kp, which is related to the size of the yield surface of model, and the rotation hardening parameter α. The presented model can reflect the dilatancy of coarse grained soil in the initial and the subsequent anisotropy state preferably. K0 consolidated drained and K0 consolidated undrained tests are carried out by making use of a gravel soil that is taken from ShuanJiangKou earth dam, and the model is validated by comparing the predicted results with the test data. As it turned out, the model can rationally predict the stress-strain behaviour of coarse-grained soil.

 

Key words: initial stress state; anisotropy; elastoplastic model; coarse-grained soil

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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