| 高应力卸荷条件下大理岩破裂面细微观形态特征及其与卸荷岩体强度的相关性研究 |
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| 引用本文： | 黄达,谭清,黄润秋. 高应力卸荷条件下大理岩破裂面细微观形态特征及其与卸荷岩体强度的相关性研究[J]. 岩土力学, 2012, 33(Z2): 7-016 |
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| 作者姓名： | 黄达 谭清 黄润秋 |
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| 作者单位： | 1. 重庆大学 土木工程学院，重庆 400045；2. 成都理工大学 地质灾害防治与地质环境保护国家重点实验室，成都 610059； 3. 重庆大学 教育部山地城市建设与新技术重点实验室，重庆 400045 |
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| 基金项目： | 国家自然科学基金面上项目资助(No.41172243);国家自然科学基金青年科学项目资助(No.40902078);国家自然科学基金重点项目资助(No.41130745);地质灾害防治与地质环境保护国家重点实验室开放基金资助(No.SKLGP2011K003);中央高校基本科研业务费资助(No.CDJZR11200007) |
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| 摘 要： | 岩石的破裂性质及破裂面的起伏粗糙特征对岩石的破裂机制及破裂面的参数取值具有重要的理论和应用意义。采用高精度的三维激光扫描和扫描电镜技术，结合分形理论，揭示高应力条件下大理岩卸荷破裂性质及破裂面的细微观形态特征，阐述主破裂面粗糙度分形维与卸荷岩体强度间的相关规律。在高应力卸荷条件下，大理岩岩样随着卸荷速率的递增宏观破裂性质由剪切、拉剪复合向张拉劈裂发展。初始围压越高卸荷速率越快，主破裂面越起伏粗糙，而初始围压越高卸荷速率越慢，主破裂面越平坦光滑。随卸荷速率的增大，微观上大理岩逐渐由穿晶剪切断裂、沿晶面张裂+穿晶剪切的复合断裂、沿晶面张裂或劈裂的变化特征。卸荷岩体的内摩擦角随破裂面粗糙程度分形维D的增大而增大，而黏聚力随D的增大而减小。
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| 关 键 词： | 岩石力学 高应力 卸荷 分形几何 扫描电镜 |
| 收稿时间： | 2012-07-12 |
Study of micro-mesoscopic characteristics of marble fracture surface and correlation with unloading rock mass strength under high stress and unloading |
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| HUANG Da,TAN Qing,HUANG Run-qiu. Study of micro-mesoscopic characteristics of marble fracture surface and correlation with unloading rock mass strength under high stress and unloading[J]. Rock and Soil Mechanics, 2012, 33(Z2): 7-016 |
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| Authors: | HUANG Da TAN Qing HUANG Run-qiu |
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| Affiliation: | 1. College of Civil Engineering; Chongqing University; Chongqing 400045, China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 3.Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China |
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| Abstract: | It is important theoretical significance and application for the failure mechanism of rock and parameter selection of fracture surface that failure property of rock and roughness of fracture surface are studied. The unloading fracture property of rock, micro-mesoscpic characteristics of fracture surface, and the correlation between fractal dimension of fracture surface roughness and unloading rock mass strength are revealed under high stress, by adopting high precision of three-dimensional 3D laser scanning and scanning electron microscope (SEM), combined with fractal theory. The macro-fracture property of marble specimen is converted from shear and tensile-shear complex to tensile fracture development. The higher the initial confining pressure and the faster the unloading rate, the main fracture surface is more fluctuant and rough. But The higher the initial confining pressure and the slower unloading rate, the main fracture surface is more flat and smooth. With the increase of unloading rate, the microscopic fracture of the marble is gradually from traverse crystal sheared, tensioned-sheared complex along crystal face and traverse crystal, to tensioned or splited along crystal. The friction angle of unloading rock is larger, but the cohesion is smaller with the fractal dimension of main fracture increases. |
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