考虑颗粒破碎的砂土临界状态特性描述

罗汀; 刘林; 姚仰平

doi:10.11779/CJGE201704002

考虑颗粒破碎的砂土临界状态特性描述 English Version

北京航空航天大学交通科学与工程学院,北京 100191

基金项目: 国家重点基础研究发展计划项目（2014CB047001）; 国家自然科学基金项目（51179003,11272031）

详细信息

作者简介:
罗汀(1957- ),女,教授,博士生导师,主要从事土的本构关系研究。E-mail: tluo@buaa.edu.cn。

计量
- 文章访问数: 413
- HTML全文浏览量: 13
- PDF下载量: 438
出版历程
- 收稿日期: 2016-01-18
- 发布日期: 2017-05-19

Description of critical state for sands considering particle crushing

School of Transportation Science and Engineering, Beihang University, Beijing 100191, China

摘要

摘要: 近年来,随着土石坝和高填方等工程的兴建,粒状土得到了广泛的应用。粒状土在高应力作用下会发生颗粒破碎的现象相当严重,因此粒状土的颗粒破碎问题不容忽视。为了更合理地描述颗粒破碎对粒状土中砂土力学特性的影响,首先分析砂土试验结果,得出了砂土颗粒分别在平均正应力和剪应力作用下的破碎特性。其次,基于UH（unified haedening,统一硬化）模型,引入可以表示砂土压缩破碎和剪切破碎的相关参数,建立了可以考虑颗粒破碎的砂土本构模型。该模型不仅能够反映砂土的剪胀、剪缩、应变硬化和软化等特性,而且可以反映在平均正应力的作用下,不同的压缩曲线最终会归一的特点,同时还能够反映剪应力作用下砂土临界状态线下移的现象。最后,使用模型预测了Lade的常规三轴试验,模型预测结果与试验结果符合良好,说明该模型能够合理地描述砂土的力学特性。
- 砂土 /
- 颗粒破碎 /
- UH模型 /
- 临界状态
Abstract: In recent years, granular soil is widely used in more and more earth-rockfill dams and high-filled projects being built. However, particle crushing of granular soil can not be ignored as the particle crushing of granular soil under high stress is very common. In order to describe the behaviours of sands, some researches are completed as follows. Firstly, by analyzing the experimental results, some breaking characteristics of sands are discovered under the applied pressure stress and shear stress. Secondly, based on the UH model, a constitutive model for sands is proposed by introducing three new parameters of particle crushing which are about pressure stress and shear stress respectively. The proposed model is capable of describing the characteristics of sands, such as stress-strain relationships, shear dilatancy, strain-hardening and softening. In addition, the characteristics, that different compression curves will eventually arrive together under high stress and the critical state line will move down under shear stress, can also be reflected by the model. Finally, by comparing the predicted results of the model and the test results of Lade’s, it is proved that the proposed model can describe the behaviours of sands well.
- sand /
- particle crushing /
- UH model /
- critical state line

HTML全文

参考文献(16)

[1]	TERZAGHI K, PECK R B. Soil mechanics in engineering practice[M]. 1st ed. New York: John Wiley & Sons, Inc, 1948.
[2]	DE SOUZA J M. Compressibility of ground sand at high pressure[D]. Cambridge: Massachusetts Institute of Technology, 1958.
[3]	YAMAMURO J A, LADE P V. Drained sand behavior in axisymmetric tests at high pressures[J]. Journal of Geotechnical Engineering, ASCE, 1996, 122(2): 109-119.
[4]	YAMAMURO J A, LADE P V. Undrained sand behavior in axisymmetric tests at high pressures[J]. Journal of Geotechnical Engineering, ASCE, 1996, 122(2): 120-129.
[5]	DAOUADJI A, HICHER P Y, RAHMA A. An elastoplastic model for granular materials taking into account grain breakage[J]. European Joutnal of Mechanics - A/Solids, 2001, 20(1): 113-137.
[6]	MUIR W D, MAEDA K. Changing grading of soil: Effect on critical states[J]. Acta Geotechnica, 2008, 3(1): 3-14.
[7]	THEVANAYAGAM S, SHENTHAN T, MOHAN S, et al. Undrained fragility of clean sands. silty sands and sandy silts[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2002, 128(10): 849-859.
[8]	LI X S, DAFALIAS Y F. Dilatancy for cohesionless soils[J]. Géotechnique, 2000, 50(4): 449-460.
[9]	YAO Y P, YAMAMOTO H, WANG N D. Constitutive model considering sand crushing[J]. Soils and Foundations, 2008, 48(4): 603-608.
[10]	胡伟, 尹振宇, DANO C, 等. 易破碎粒状材料本构研究[J]. 岩土力学, 2011, 32(增刊2): 159-165. (HU Wei, YAN Zhen-yu, DANO C, et al. Constitutive study of crushable granular materials[J]. Rock and Soil Mechanics, 2011, 32(S2): 159-165. (in Chinese))
[11]	SHENG D C, YAO Y P, CARTER J P. A volume-stress model for sands under isotropic and critical stress states[J]. Canadian Geotechnical Journal, 2008, 48: 1639-1645.
[12]	YAO Y P, HOU W, ZHOU A N. UH model: three-dimensional unified hardening model for over- consolidated clays[J]. Géotechnique, 2009, 59(5): 451-469.
[13]	HARDIN B O. Crushing of soil particles[J]. Journal of Geotechnical Engineering, 1985, 111(10): 1177-1192.
[14]	PESTANA J M, WHITTLE A J. Compression model for cohesionless soils[J]. Géotechnique, 1995, 45(4): 611-631.
[15]	姚仰平, 余亚妮. 基于统一硬化参数的砂土临界状态本构模型[J]. 岩土工程学报, 2011, 33(12): 1827-1832. (YAO Yang-ping, YU Ya-ni. Extended critical state constitutive model for sand based on unified hardening parameter[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1827-1832. (in Chinese))
[16]	YAO Y P, SUN D A, LUO T. A critical state model for sands dependent on stress and density[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2004, 28(4): 323-337.