模拟月壤颗粒形状特征及其对抗剪强度影响分析

doi:10.12068/j.issn.1005-3026.2016.11.025

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (11): 1640-1644.DOI: 10.12068/j.issn.1005-3026.2016.11.025

模拟月壤颗粒形状特征及其对抗剪强度影响分析

林呈祥，钟世英，凌道盛

(浙江大学软弱土与环境土工教育部重点实验室，浙江杭州310058)

收稿日期:2015-06-19 修回日期:2015-06-19 出版日期:2016-11-15 发布日期:2016-11-18
通讯作者: 林呈祥
作者简介:林呈祥(1988-)，男，浙江台州人，浙江大学博士研究生；凌道盛(1968-)，男，安徽黄山人，浙江大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51278451); 浙江省自然科学基金资助项目(LZ12E09001).

Analysis of Particle Shape Characteristics of Lunar Soil Simulant and Its Effect on Shear Strength

LIN Cheng-xiang， ZHONG Shi-ying， LING Dao-sheng

MOE Key Laboratory of Soft Soils and Geo-environmental Engineering， Zhejiang University， Hangzhou 310058， China.

Received:2015-06-19 Revised:2015-06-19 Online:2016-11-15 Published:2016-11-18
Contact: LIN Cheng-xiang
About author:-
Supported by:
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摘要/Abstract

摘要： 为研究颗粒形状特征对抗剪强度的影响，对模拟月壤颗粒进行体视显微镜扫描拍照，并利用图形处理软件对各粒径组颗粒的形状特征进行量化统计.结果表明:模拟月壤颗粒的主要形状有圆形、类椭圆形、类三角形和类正方形等.利用PFC 3D软件中的“Clump”命令构造出不同形状的模拟月壤颗粒并通过三轴试验数值模型研究其抗剪强度指标值，模拟结果表明:颗粒形状对模拟月壤的抗剪强度指标值有着明显的影响，其中构造出的类椭圆体颗粒试样抗剪强度最大，而规则的球体颗粒试样的抗剪强度最小；当颗粒形状都是类三角体时，凹凸度越大，试样的抗剪强度指标值也越大.

关键词: 模拟月壤, 颗粒形状, 三轴压缩试验, 抗剪强度, PFC 3D数值模拟

Abstract: In order to study the effect of particle shape characteristics on shear strength， particles of lunar soil simulant are scanned and photographed with a stereo microscope. Then， a digital imaging processing software is used to statistically analyze the geometric characteristics of the particles. It shows that the particles of lunar soil simulant mainly are of four shapes: sphere， quasi-ellipsoid shape， quasi-trigonal shape and quasi-cube shape. Particles with the three irregular shapes are simulated as clumps in PFC 3D， and the numerical model of tri-axial test is obtained to study their shear strength. The numerical results show that: the particle shape has a noticeable effect on shear strength; the shear strength of particles of quasi-ellipsoid shape is the greatest of all， while the sphere particles has the minimum shear strength. For particles of the same quasi-trigonal shape， the greater ruggedness it is， the stronger shear strength the sample has.

Key words: lunar soil simulant, shape of particle, tri-axial compression test, shear strength, PFC 3D numerical simulation

中图分类号:

TU443

林呈祥，钟世英，凌道盛. 模拟月壤颗粒形状特征及其对抗剪强度影响分析[J]. 东北大学学报:自然科学版, 2016, 37(11): 1640-1644.

LIN Cheng-xiang， ZHONG Shi-ying， LING Dao-sheng. Analysis of Particle Shape Characteristics of Lunar Soil Simulant and Its Effect on Shear Strength[J]. Journal of Northeastern University Natural Science, 2016, 37(11): 1640-1644.

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模拟月壤颗粒形状特征及其对抗剪强度影响分析

Analysis of Particle Shape Characteristics of Lunar Soil Simulant and Its Effect on Shear Strength

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