| 三轴应力状态下盐岩强度分析探讨 |
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| 引用本文： | 刘建锋,边 宇,郑得文,等.三轴应力状态下盐岩强度分析探讨[J].岩土力学,2014,35(4):919-925. |
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| 作者姓名： | 刘建锋 边 宇 郑得文 等 |
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| 作者单位： | 1. 四川大学 水利水电学院 水力学与山区河流开发保护国家重点实验室，成都 610065； 2. 四川大学 能源工程安全与灾害力学教育部重点实验室，成都 610065；3. 中国石油勘探开发研究院廊坊分院，河北 廊坊 065007 |
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| 基金项目： | 国家自然科学基金资助项目(No. 51120145001，No. 51104101，No. 51374148)。 |
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| 摘 要： | 通过分析盐岩在三轴应力状态下的变形,说明了较高围压下盐岩的大变形特性,提出了三轴应力状态下,利用轴向荷载除以试件初始横截面面积得到应力-应变关系存在的问题,据此对工程应变和对数应变进行了分析和对比,阐明了这两种应变的适用条件,并开展了不同围压下的试验测试和对试验结果对比分析。研究揭示了应利用对数应变分析盐岩的大变形特性和对变形后的应力进行修正,得到了盐岩的工程应变和对数应变均可表示为围压的线性函数,围压为20 MPa时的轴向压缩变形量是5 MPa时的3.09倍。围压越高,对数应变修正得到的最大轴向应力与不修正的差值越大,用对数应变修正后的轴向应力低于不修正的结果,围压达到20 MPa时,前者仅为后者的63.85%。
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| 关 键 词： | 盐岩 三轴压缩 工程应变 对数应变 强度特性 |
| 收稿时间： | 2014-01-24 |
Discussion on strength analysis of salt rock under triaxial compressive stress |
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| LIU Jian-feng,BIAN Yu,ZHENG De-wen,WU Zhi-de,LI Tian-yi.Discussion on strength analysis of salt rock under triaxial compressive stress[J].Rock and Soil Mechanics,2014,35(4):919-925. |
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| Authors: | LIU Jian-feng BIAN Yu ZHENG De-wen WU Zhi-de LI Tian-yi |
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| Institution: | 1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources & Hydropower, Sichuan University, Chengdu 610065, China; 2. Key Laboratory of Energy Engineering, Safety and Mechanics on Disasters of Ministry of Education, Sichuan University, Chengdu 610065, China; 3. Research Institute of Petroleum Exploration and Development-Langfang, Langfang, Hebei 065007, China |
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| Abstract: | Through analyzing the salt rock deformation under triaxial compressive stress condition, the large compressive deformation properties of salt rock under higher confining pressure are shown. The problems of the axial stress-strain obtained by axial load divided by the initial cross-sectional area of the specimen are pointed out for triaxial compressive tests. Thus the engineering strain and logarithmic strain are analyzed and compared; and the applicable conditions of these two strains are explained. Finally, the triaxial compressive tests for different confining pressures are carried out and the test results are compared. The research results shows that the logarithmic strain should be used to analyze the large deformation property and the modification of axial stress for salt rock when the larger deformation occurs. The deformation obtained by logarithmic strain and engineering strain for salt rock could be expressed as a linear function of confining pressure. When the confining pressure is 20 MPa, the axial compressive deformation is 3.09 times that of 5 MPa. The higher the confining pressure is, the larger difference of the maximum axial stress is between obtained by the initial cross-sectional area and the logarithmic strain corrected area, and the latter is less than the former. When the confining pressure is up to 20 MPa, the maximum axial stress for the logarithmic strain correction area is only 63.85% of that for the initial cross-sectional area. |
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| Keywords: | rock salt triaxial compression engineering strain logarithmic strain strength property |
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