| 风化砂岩的力学特性及本构关系研究 |
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| 引用本文： | 张卫中,陈从新,余明远.风化砂岩的力学特性及本构关系研究[J].岩土力学,2009,30(Z1):33-36. |
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| 作者姓名： | 张卫中 陈从新 余明远 |
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| 作者单位： | 1. 中南财经政法大学 安全科学与管理学院，武汉 430074；2. 中国科学院武汉岩土力学研究所，武汉 430071 |
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| 基金项目： | 国家自然基金，中南财经政法大学振兴工程科研基金 |
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| 摘 要： | 以不同风化程度的砂岩试件为研究对象，对其单轴、三轴力学强度进行了试验研究。结果表明，随着风化程度的增加，砂岩的力学强度逐渐降低；三轴曲线的主应力差 对砂岩强度的影响基本呈线性；不同风化程度的砂岩试件的内摩擦角随着风化程度的增加，摩擦角逐渐增大；而凝聚力则随着风化程度的增加而减小。建立了岩石三轴受力的抛物曲线-线弹性-Duncan双曲线-塑性软化-残余理想塑性5段式模型，模型能够正确反映砂岩三轴受力变形特点。
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| 关 键 词： | 风化 砂岩 强度 5段式模型 |
| 收稿时间： | 2009-03-20 |
Study of mechanical properties and constitutive relation of weathered sandstone |
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| ZHANG Wei-zhong,CHEN Cong-xin,YU Ming-yuan.Study of mechanical properties and constitutive relation of weathered sandstone[J].Rock and Soil Mechanics,2009,30(Z1):33-36. |
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| Authors: | ZHANG Wei-zhong CHEN Cong-xin YU Ming-yuan |
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| Institution: | 1. School of Safety Science and Administration, Zhongnan University of Economics and Law (ZUEL), Wuhan 430074, China; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Both uniaxial and triaxial mechanical strengths are studied under different weathering degrees of sandstones. The results show that sandstone strength decreases as the weathering degree increases; the effect on the strength of sandstone caused by principal stress difference is linear essentially; internal friction angle of sandstone increases and cohesion decreases as the weathering degree increases; the constitutive relation of 5 segments stress-strain curves of sandstone is established, which is better in reflecting the characteristics of triaxial strength experiment. |
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| Keywords: | weathering sandstone strength model of 5 segments |
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