茂木式真三轴试验机的端部摩擦效应

doi:10.13722/j.cnki.jrme.2017.1179

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摘要茂木式真三轴试验中需要在加载装置和试件之间至少设置两对刚性接触的垫块，由于加载过程中端部摩擦限制了试件的自由变形，因而提高了试样的测试强度。为定量评估端部摩擦效应，采用同一批红砂岩试样开展不同端部摩擦因数和中间主应力条件下的双向压缩试验，试验结果表明，不同端部摩擦因数条件下的试件强度测试值存在显著差异，相同中间主应力条件下摩擦因数从0.12提高到0.28时，最大主应力极限值提高5.5%～43%。基于试验数据分析采用不同破坏准则时摩擦效应的合理性，结果表明应变能准则对双向受压工况适用性最好。基于试验数据和应变能准则，建立摩擦效应的定量表达式，绘制考虑摩擦效应的中间主应力效应曲线，分析摩擦效应对曲线形状的影响，分析结果与试验数据吻合良好。通过试验揭示摩擦效应的重要影响，建立定量分析模型，对于评价真三轴试验数据的可靠性具有重要参考意义。

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	范鹏贤
	李颖
	赵跃堂
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	马林建

关键词 ：岩石力学, 真三轴试验机, 端部摩擦效应, 双向受压, 破坏准则

Abstract：Due to the rigid platens used in Mogi type of true-triaxial test apparatus，the friction between the loading platens and samples enhances the measured strength of material. In order to quantitatively estimate the end effect，the biaxial compression tests on the red sand stone samples were conducted under different interface frictions and intermediate stress conditions. The measured strengths of samples under different interface frictions differ significantly. When the friction coefficients of interface increase from 0.12 to 0.28，the maximum stresses of samples under the same intermediate stress increase 5.5% to 43%. Several yielding criteria were used to estimate the end effect and the strain energy criterion was adopted for further analysis. An expression for end effect was established and the intermediate stress effect curves considering end effect were drawn in coordinate. The influence of end friction on the curve?s shape was revealed to agree well with test results.

Key words： rock mechanics true-axial test machine end friction effect biaxial compression yielding criterion

引用本文:

范鹏贤，李颖，赵跃堂，董璐，马林建. 茂木式真三轴试验机的端部摩擦效应[J]. 岩石力学与工程学报, 2017, 36(11): 2720-2730.
FAN Pengxian，LI Ying，ZHAO Yuetang，DONG Lu，MA Linjian. End friction effect of Mogi type of true-triaxial test apparatus. , 2017, 36(11): 2720-2730.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1179 或 http://www.rockmech.org/CN/Y2017/V36/I11/2720

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