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Influence of anisotropic stress path and stress history on stiffness of calcareous sands from Western Australia and the Philippines

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第1期14卷 197-209页

作者： Huan He Siyue Li kostas senetakis Matthew Richard Coop Songyu Liu Institute of Geotechnical Engineering Southeast UniversityNanjing210096China Department of Architecture and Civil Engineering City University of Hong KongKowloonHong KongChina Department of Architecture and Civil Engineering Yeung Kin Man Academic BuildingBlue Zone 6/FCity University of Hong KongKowloonHong KongChina Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondonUK

Investigation of dynamic properties of carbonate/calcareous soils is important in earthquake and offshore engineering as these soils are commonly encountered in large-scale projects related with energy geomechanics and land *** this study,the stiffness and stiffness anisotropy of two types of calcareous sands(CS)from the Western Australia and the Philippines were examined using bender elements configured in different directions in stress path *** measurements were taken on specimens subjected to constant p’compression/extension and biaxial stress paths and additional tests were performed on three types of silica sands with different geological origins and particle shapes,which were used as benchmark materials in the *** with the three brands of silica sands,the stiffness of the CS was found to be more significantly influenced by anisotropic loading;an important observation of the experimental results was that stress anisotropy had different weighted influences on the stiffness in different directions,thus influencing stiffness *** were made between the specimens subjected to complex loading paths,and respected model parameters as suggested from published expressions in the *** comparisons further highlighted that calcareous soils have different responses in terms of stiffness,stiffness anisotropy and loading history,compared with that of silica-based sands.

关键词： Calcareous soils Dynamic properties Shear stiffness Stress anisotropy Stress history

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Micromechanical experiments using a new inter-granule loading apparatus on gravel to ballast-sized materials

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Friction 2020年第1期8卷 70-82页

作者： Chitta Sai SANDEEP kostas senetakis City University of Hong Kong Hong Kong SARChina

Micromechanical and tribological studies of geological materials with a particular focus on their contact-mechanics behavior at the grain scale are currently a major interest in the engineering and geoscience disciplines. In this study, a new robust micromechanical apparatus developed at the City University of Hong Kong is described;it is capable of conducting inter-granule(or inter-particle) loading tests on fine gravel to ballast-sized materials of sizes as small as 5-10 mm to granules(or ballast) as big as 50 mm. The focus of our study is the description of the major technical features of the new apparatus and its performance and repeatability in conducting experiments on reference grains of chrome steel balls and glass balls;in addition, we conducted a preliminary set of experiments on crushed granitic rock, which is a material widely used in geotechnical and transportation infrastructure. The representative results of these experiments are presented in terms of the normal force-displacement relationship, friction, and tangential stiffness. The newly developed large-size apparatus is further compared with a well-established apparatus that can conduct micromechanical tests on sand-sized materials.

关键词： experimental micromechanics contact mechanics linear bearings inter‐particle friction granite debris flow ballast

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A note on influence of stress anisotropy on the Poisson's ratio of dry sand

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第6期9卷 1159-1164页

作者： Huan He Mingnan Li kostas senetakis University of New South Wales(UNSW) SydneyAustralia City University of Hong Kong Hong Kong Special Administrative Region

In this study, extender and bender element tests were conducted investigating the small-strain Poisson’s ratio of variable sands, with a focus on the effect of stress anisotropy in order to quantify the sensitivity of Poisson’s ratio to the applied deviatoric stress. Four different uniform sands were tested, including a biogenic sand, a crushed rock and two natural sands, covering a wide range of particle shapes. From these sands, eleven samples were prepared in the laboratory and were tested under variable stress paths,maintaining a constant mean effective pressure while increasing the deviatoric compressive load. Under the application of these given stress paths, the data analysis indicated that the sensitivity of Poisson’s ratio to the stress ratio was more pronounced for sands with irregularly shaped particles in comparison to sands with fairly rounded and spherical grains. For sands with very irregularly shaped particles, the increase of Poisson’s ratio from the isotropic to the anisotropic stress state reached 50%, while this increase for natural sands with fairly rounded particles was in the order of 20%.

关键词： Bender elements Sand Poisson’s ratio

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基于嫦娥五号月球样品的月壤残余内摩擦角预测（英文）

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Science Bulletin 2023年第7期 730-739页

作者：聂家岩崔一飞 kostas senetakis 郭丹王瑜王国栋冯鹏贺怀宇张徐航张小平李存惠郑虎胡伟牛富俊刘权兴李安原 State Key Laboratory of Hydroscience and Engineering Tsinghua University School of Civil Engineering Wuhan University Department of Architecture and Civil Engineering City University of Hong Kong State Key Laboratory of Tribology Tsinghua University Key Laboratory of Mountain Hazards and Surface Process Institute of Mountain Hazards and Environment Chinese Academy of Sciences Department of Civil Engineering Tsinghua University State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Department of Geotechnical Engineering College of Civil Engineering Tongji University State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology South China Institute of Geotechnical Engineering South China University of Technology School of Mathematical Sciences Shanghai Jiao Tong University Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing University

随着人类探月工程的快速发展,月球基地建设以及月表资源开发利用有望更快实现.合理预测月壤工程力学性质对于未来深层次探月工程意义重大.我国嫦娥五号返回月球样品为研究月壤工程力学特性提供了直接的实测材料.然而,月球样品极其珍贵,...

随着人类探月工程的快速发展,月球基地建设以及月表资源开发利用有望更快实现.合理预测月壤工程力学性质对于未来深层次探月工程意义重大.我国嫦娥五号返回月球样品为研究月壤工程力学特性提供了直接的实测材料.然而,月球样品极其珍贵,难以满足传统土工试验测试.为了应对这一科学挑战,本研究从无损分析月球样品颗粒属性入手,使用高精度X-射线μCT扫描、三维白光干涉、原子力显微镜等无损测试手段,分析了不同类型月壤颗粒的三维多尺度形态、弹性力学和摩擦属性等指标.在此基础上,基于颗粒材料宏微观物理力学理论和数值模型尝试预测了嫦娥五号采样处月壤残余内摩擦角.本研究为基于月球样品信息跨尺度分析月壤工程力学性质提供了可行思路.

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基于嫦娥五号月球样品的月壤残余内摩擦角预测

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Science Bulletin 2023年第7期68卷 730-739页

作者：聂家岩崔一飞 kostas senetakis 郭丹王瑜王国栋冯鹏贺怀宇张徐航张小平李存惠郑虎胡伟牛富俊刘权兴李安原 State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China School of Civil Engineering Wuhan UniversityWuhan 430072China Department of Architecture and Civil Engineering City University of Hong KongHong Kong 999077China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Key Laboratory of Mountain Hazards and Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Department of Civil Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China South China Institute of Geotechnical Engineering South China University of TechnologyGuangzhou 510641China School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing 312000China

随着人类探月工程的快速发展,月球基地建设以及月表资源开发利用有望更快实现,合理预测月壤工程力学性质对于未来深层次探月工程意义重大,我国嫦娥五号返回月球样品为研究月壤工程力学特性提供了直接的实测材料。然而,月球样品极其珍贵... 详细信息

随着人类探月工程的快速发展,月球基地建设以及月表资源开发利用有望更快实现,合理预测月壤工程力学性质对于未来深层次探月工程意义重大,我国嫦娥五号返回月球样品为研究月壤工程力学特性提供了直接的实测材料。然而,月球样品极其珍贵,难以满足传统土工试验测试.为了应对这一科学挑战,本研究从无损分析月球样品颗粒属性入手,使用高精度X-射线μCT扫描、三维白光干涉、原子力显微镜等无损测试手段,分析了不同类型月壤颗粒的三维多尺度形态、弹性力学和摩擦属性等指标.在此基础上,基于颗粒材料宏微观物理力学理论和数值模型尝试预测了嫦娥五号采样处月壤残余内摩擦角。本研究为基于月球样品信息跨尺度分析月壤工程力学性质提供了可行思路。

关键词： Chang’e-5 lunar samples Geometry Mechanics Tribology Residual friction angle Cross-scale prediction

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