| 摘要: |
| 通过4组塑性混凝土的单轴和常规三轴压缩应力应变全曲线试验，研究了三轴应力下塑性混凝土应力应变关系.结果表明：在围压作用下，塑性混凝土轴向应力应变曲线与单轴压缩下的曲线差别明显，主要表现为直线上升段很短，曲线上升段较长，无明显峰值点，下降段较平缓.利用割线模量表征塑性混凝土三轴应力下应力应变曲线上升段的主要变形特征，分析了影响割线模量的主要因素，建立了割线模量与围压、单轴抗压强度和弹性模量之间的关系式.研究了塑性混凝土三轴应力下峰值应变随围压、单轴应力下抗压强度及峰值应变的变化规律，并建立了相应的关系式.全面分析了塑性混凝土单轴及三轴作用下应力应变曲线特征，通过归一化处理后，拟合出常规三轴应力下塑性混凝土轴向应力应变关系式. |
| 关键词: 塑性混凝土 三轴试验 应力应变关系 |
| DOI：103969/j.issn1007 9629201401008 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51109082）；水利部公益性行业科研专项（201301034）；河南省教育厅自然科学研究计划（2011A570005）；华北水利水电学院高层次人才科研启动项目资助（2011A003） |
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| Experiment Study of Stress Strain Relation of Plastic Concreteunder Triaxial Stress |
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WANG Siwei1, PAN Xuwei1, GAO Danying2, LI Xiaochao1, SUN Yigui3
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1.Insitute of Geotechnical Engineering and Hydraulic Structure Engineering, North China University of WaterConservancy and Hydroelectric Power, Zhengzhou 450045, China;2.School of Civil Engineering, ZhengzhouUniversity, Zhengzhou 450002, China;3.Hydropower Survey and Design Institute of Linyi, Linyi 276001, China
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| Abstract: |
| Stress strain relation of plastic concrete was studied using conventional triaxial and uniaxial compression tests with 4 plastic concrete mixes. The test results show that complete stress strain curve of plastic concrete in confining pressure is remarkably different from that in the uniaxial compression. There are longer unlinear transcending section, no distinct peak point, or sharply descending section. The relation is given between secant modulus and confining pressure, elastic modulus and strength under uniaxial compression stress. Relation is expressed between peak strain and confining pressure, strength and peak strain under uniaxial compression stress. At last, constitutive model of plastic concrete is presented in conventional triaxial stress state. |
| Key words: plastic concrete triaxial test stress strain relation |
