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| 1 | A constitutive model for granular materials considering grain breakage显示文摘A particle breakage has a significant impact on the mechanical behavior of granular materials. In this paper, we present an elasto-plastic model with two yield surfaces to which the influence of particle breakage has been introduced. The main feature of this model is to incorporate the change in the critical state line (CSL) consequent to the grain breakage induced by isotropic and deviatoric stresses during loading. For this purpose we propose a breakage function which connects the evolution of the CSL to the energy consumed. Results from earlier studies on drained and undrained compression and extension triaxial tests were used to calibrate and validate the model. Comparison between earlier results and our simulations indicates that the model can reproduce with good accuracy the mechanical behavior of crushable granular materials and predict the evolution of the grain size distribution during loading. | HU Wei YIN ZhenYu DANO Christophe HICHER Pierre-Yves | 2011 | Science China(Technological Sciences)2011，54，8： | 31 |
| 2 | 粒状材料临界状态的颗粒级配效应显示文摘采用理想颗粒材料(DEM理想球体)、人工颗粒材料(玻璃球)和天然颗粒材料(Hostun砂),通过数值和室内常规三轴排水试验研究了颗粒材料级配对其应力–应变响应和临界状态的影响规律。试验结果表明:在相同加载初始条件下(e0=0.574,p0'=400 kPa),随着不均匀系数Cu(d60/d10)的增大,试样在q–ε1平面上从剪胀变为剪缩,在εv–ε1平面上表现出由应变软化转变为应变硬化的特性。通过不同围压下的三轴排水试验,在e–p'和q–p'平面上分别对不同级配的颗粒材料集合体绘制了临界状态线,e–p'平面随着Cu的增大临界状态线往下偏移,而在q–p'平面上临界状态线不随Cu的改变而改变。 | 李罡 刘映晶 尹振宇 Christophe Dano Pierre-Yves Hicher | 2014 | 岩土工程学报2014，36，3： | 22 |
| 3 | 一个能够模拟软土时效特性的简单弹黏塑性模型(英文)显示文摘基于Perzyna超应力理论与修正剑桥模型,建立了一个能够模拟软土时效特性的简单的弹黏塑性本构模型,提出了参数的实验室确定方法。以室内试验为基础,模拟了不同试验条件下软土的时效特性:应变速率对先期固结压力和不排水抗剪强度的影响;一维固结与次固结特征及竖向应力对次固结系数的影响;不同应力水平下的不排水蠕变特征;不同应变水平下的应力松弛特征。通过实验数据与数值模拟的比较,对模型进行了验证,发现上述本构模型能够较好地描述不同加载路径下的正常固结与微超固结土的时效特征。同时,通过对同一试样的多阶段加卸载三轴实验、现场压力仪实验及实验室压力仪实验的模拟,发现此模型可以较好地拟合实验过程中复杂应力路径下软土的时效特征。 | 尹振宇 张冬梅 HICHER Pierre-yves 黄宏伟 | 2008 | 岩土工程学报2008，30，6： | 13 |
| 4 | Analysis of cement-treated clay behavior by micromechanical approach显示文摘Experimental results show the significant influence of cement content on the mechanical properties of cement-treated clays.Cementation is produced by mixing a certain amount of cement with the saturated clay.The purpose of this paper is to model the cementation effect on the mechanical behavior of cement-treated clay.A micromechanical stress-strain model is developed considering explicitly the cementation at inter-cluster contacts.The inter-cluster bonding and debonding during mechanical loading are introduced in two ways:an additional cohesion in the shear sliding and a higher yield stress in normal compression.The model is used to simulate isotropic compression and undrained triaxial tests under various confining stresses on cement-treated Ariake clay and Singapore clay with various cement contents.The applicability of the present model is evaluated through comparisons between numerical and experimental results.The evolution of local stresses and local strains in inter-cluster planes are discussed in order to explain the induced anisotropy due to debonding at contact level under the applied loads.The numerical simulations demonstrate that the proposed micromechanical approach is well adapted for taking into account the main physical properties of cement-treated clay,including damage and induced anisotropy under mechanical loading. | Dong-Mei ZHANG Zhen-Yu YIN Pierre-Yves HICHER Hong-Wei HUANG | 2013 | Frontiers of Structural and Civil Engineering2013，7，2： | 6 |
| 5 | 易破碎粒状材料本构研究显示文摘粒状材料被广泛地应用到土木工程的各个领域。大部分粒状材料在外力作用下较容易产生颗粒破碎,颗粒破碎对材料的力学性能有很大的影响。为了更好地描述易破碎粒状材料的力学特性,基于弹塑性力学和临界状态土力学开发了一种能够考虑颗粒破碎效应的本构模型。此本构模型能够考虑在剪应力和压应力作用下引起的颗粒破碎对粒状材料力学性能的影响。为了考虑颗粒破碎的影响,基于对Cambria砂的高压试验,得出了临界状态线位置与消耗塑性功之间的关系,并称之为'破碎方程'。此本构模型拥有双屈服面,分别考虑剪切和等向压缩产生的塑性变形。通过试验结果与数值计算结果的对比得出,新的本构模型能较好地描述易破碎粒状材料的力学特性。 | 胡伟 尹振宇 DANO Christophe HICHER Pierre-yves | 2011 | 岩土力学2011，32，S2： | 5 |
| 6 | Micromechanical analysis of the behavior of stiffclay显示文摘Cementations formed in geological timescale are observed in various stiff clays.A micromechanical stress strain model is developed for modeling the effect of cementation on the deformation behavior of stiff clay.The proposed approach considers explicitly cementations at intercluster contacts,which is different from conventional model.The concept of inter-cluster bonding is introduced to account for an additional cohesion in shear sliding and a higher yield stress in normal compression.A damage law for inter-cluster bonding is proposed at cluster contacts for the debonding process during mechanical loading.The model is used to simulate numerous stress-path tests on Vallericca stiff clay.The applicability of the present model is evaluated through comparisons between the predicted and the measured results.In order to explain the stress-induced anisotropy arising from externally applied load,the evolution of local stresses and local strains at inter-cluster planes are discussed. | Zhen-Yu Yin Ching S. Chang Pierre-Yves Hicher Jian-Hua Wang | 2011 | Acta Mechanica Sinica2011，27，6： | 4 |
| 7 | 模拟堤坝荷载作用下软土的速率效应特性(英文)显示文摘用基于Perzyna超应力理论与修正剑桥模型的简单的弹黏塑性本构模型,耦合比奥固结理论,来模拟堤坝荷载作用下的软土的速率效应特性。以土工织布加固的堤坝为实例,提出从最初几个加载阶段下的沉降数据来确定黏性参数的反分析法。根据反分析的参数值来模拟,同实测值予以比较,并同文献中使用其他四个不同本构模型的模拟结果进行比较,比较研究表明:本文建议的模型具有优越性。特别研究了土工织布加固对堤坝下软土的滞后变形和稳定性的影响。良好的模拟结果反应了所提出的反分析法的可用性,同时展示了所使用的弹黏塑性本构模型在岩土工程中的实用性:弥补了修正剑桥模型不能模拟速率效应特性的缺点;跟其他黏塑性本构模型比较,本模型参数确定方法简单,模拟结果准确。 | 尹振宇 黄宏伟 UTILI Stefano HICHER Pierre-Yves | 2009 | 岩土工程学报2009，31，1： | 4 |
| 8 | Micromechanical analysis of kinematic hardening in natural clay显示文摘 | YIN Z Y CHANG C S HICHER P Y | 2009 | International Journal of Plasticity2009，25，8： | 1 |
| 9 | Model for granular ma- terials with surface energy forces 显示文摘 | CHANG C S HICHER P Y | 2009 | Journal of Aero- space Engineering2009，22，1： | 1 |
| 10 | An elasto-plastic model for granular materials with microstructural consideration显示文摘 | Chang C S Hicher P | 2005 | International Journal of Solids and Structures2005，42，14： | 1 |
| 11 | An anisotropic elastic–viscoplastic model for soft clays显示文摘 | Zhen-Yu Yin Ching S. Chang Minna Karstunen Pierre-Yves Hicher | 2009 | International Journal of Solids and Structures2009，，5： | 1 |
| 12 | Micromechanical analysis of kinematic hardening in natural clay显示文摘 | Zhen-Yu Yin Ching S. Chang Pierre-Yves Hicher Minna Karstunen | 2008 | International Journal of Plasticity2008，，8： | 1 |
| 13 | An elastoplastic model for granular materials taking into account grain breakage显示文摘 | DAOUADJI A HICHER P Y RAHMA A | 2001 | European Journal of Mechanics - A/Solids2001，20，1： | 1 |
| 14 | The effects of filtration on the injection of cement-based grouts in sand columns显示文摘 | Olivier Chupin Nadia Saiyouri Pierre-Yves Hicher | 2008 | Transport in Porous Media2008，，： | 1 |
| 15 | The effects of filtration on the injection of cement-based grouts in sand columns显示文摘 | CHUPIN O SAIYOURI N HICHER P Y | 2008 | Transport in Porous Media2008，72，2： | 1 |
| 16 | On the capil- lary stress tensor in wet granular materials显示文摘 | Scholtes L Hicher P Y Nicot F | 2009 | Int J Numer Anal Met2009，33，10： | 1 |
| 17 | Identifying parameters controlling soil delayed behaviour from laboratory and in situ pressuremeter testing 显示文摘 | YIN Z-Y HICHER P Y | 2008 | International Journal for Numerical and Analytical Methods in Geomechanics2008，32，12： | 1 |
| 18 | Rotation of principal directions in Ko consolidated clay 显示文摘 | HICHER P Y LADE P V | 1987 | Journal of Geoteclmical Engineering1987，774，788： | 1 |
| 19 | An anisotropic elastic viscoplastic model for soft soils 显示文摘 | YIN Z-Y CHANG C S KARSTUNEN M HICHER P Y | 2010 | International Journal of Solids and Structures2010，47，5： | 1 |
| 20 | Rotation of principal directions in K0-consolidated clay 显示文摘 | HICHER P Y LADE P V | 1987 | Journal of Geotechnical Engineering ASCE1987，113，7： | 1 |
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