岩土力学2018，Vol.39Issue(3)：1123-1129,7.DOI:10.16285/j.rsm.2016.0577
用于颗粒土微观力学行为试验的微型三轴试验仪
A mini-triaxial apparatus for testing of micro-scale mechanical behavior of granular soils
摘要
Abstract
The micro-scale mechanical behavior of granular soils (e.g.,particle movement and particle breakage,etc.) govems their macro-scale stress and strain behavior,such as strain localization and stress hardening,etc.To study the micro-scale mechanical behavior of granular soils,a mini-triaxial apparatus is developed in this paper.The axial loading system of the apparatus is composed of a servo-controlled stepping motor and turbine-driven reducer.The confining pressure is provided by a GDS pressure generator,and the chamber is fabricated with a highly transparent material with high strength and low density.In conjunction with an X-ray micro CT image processing and analysis techniques,this apparatus can be used for non-destructive detection of the micro-scale characteristics of a mini dry sample (i.e.,8 mm in diameter and 16 mm in height) under triaxial shearing.A triaxial test of a Leighton Buzzard sand (LBS) sample with an initial grading of 0.60-1.18 mm under a confiming pressure of 1.5 MPa is carried out using this apparatus.The results show a reasonable stress-strain curve and CT images with easily distinguishable features,which demonstrates that the apparatus can be used for testing of the micro-scale mechanical behavior of granular soils.关键词
微型三轴仪/X射线显微CT/无损检测/微观力学行为Key words
mini-triaxial apparatus/X-ray micro CT/non-destructive detection/micro-scale mechanical behavior分类
建筑与水利引用本文复制引用
程壮,王剑锋..用于颗粒土微观力学行为试验的微型三轴试验仪[J].岩土力学,2018,39(3):1123-1129,7.基金项目
香港研资局优配研究金(No.CityU 11272916) （No.CityU 11272916）
国家自然科学基金(No.51779213) （No.51779213）
深圳市基础研究基金(No.JCYJ20150601102053063).This work was supported by the General Research Fund from the Research Grant Council of the Hong Kong SAR (CityU 11272916),the National Science Foundation of China (51779213) and the Fundamental Research Foundation of Shenzhen (JCYJ20150601102053063). （No.JCYJ20150601102053063）
