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| Study on uniaxial compression characteristics of brittle rock and soil aggregate |
| Received:November 01, 2016 Revised:April 22, 2017 |
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| DOI：10.7511/jslx20161101003 |
| KeyWord:rock and soil aggregate uniaxial compressive strength rock content interface strength failure mode |
| Author | Institution |
| 冯春 |
中国科学院 力学研究所, 北京 ;中国科学院 流固耦合系统力学重点实验室, 北京 |
| 李志刚 |
中国科学院 力学研究所, 北京 ;中国科学院 流固耦合系统力学重点实验室, 北京 ;北京市路政局道路建设工程项目管理中心, 北京 |
| 李世海 |
中国科学院 力学研究所, 北京 ;中国科学院 流固耦合系统力学重点实验室, 北京 |
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| Abstract: |
| Rock and soil aggregate (RSA) is widely distributed in China and the mechanical properties are extremely different in one place from another, so it is important to study the influencing factors of uniaxial compression.With the help of dimensional analysis, the non-dimensional relationship between the uniaxial compression characteristics of RSA and the influencing factors is clarified.A stochastic generation technique of rock block is proposed, which can produce stochastic block system with specified gradation.With continuum-discontinuum element method (CDEM), the macro mechanical properties and evolvement laws of brittle RSA with structural feature is discussed, and the macro constitutive law, uniaxial compressive strength and failure mode of brittle RSA with different rock contents and interface strengths are analyzed.The results show that, with the increment of rock content, the macro uniaxial compressive strength decreases rapidly;however, when rock content exceeds 15%, the uniaxial compressive strength is almost unchanged.With the same rock content and rock distribution, with the increment of interface strength, the macro uniaxial compressive strength increases gradually;when the relative interface strength exceeds 20, the uniaxial strength remains constant.When relative strength of interface is less than 1, the penetrating crack will appear throughout the sample;and when the relative strength is larger than 1, local compressive shear failure will occur near the middle and top of the sample. |
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