| 宏细观缺陷对岩体力学特性及边坡稳定影响研究 |
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| 引用本文： | 刘红岩.宏细观缺陷对岩体力学特性及边坡稳定影响研究[J].岩土力学,2019,40(Z1):431-439. |
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| 作者姓名： | 刘红岩 |
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| 作者单位： | 中国地质大学（北京）工程技术学院，北京 100083 |
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| 基金项目： | 中央高校基本科研业务费项目（No.2-9-2017-076）；国家自然科学基金项目（No.41162009）。 |
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| 摘 要： | 岩体是同时含有宏、细观缺陷的天然损伤地质体，如何更好地反映该两类缺陷对岩体力学特性的共同影响是亟待解决的一个重点和难点问题。采用FLAC3D中的弹脆性模型和Null模型分别描述完整岩石和上述两类缺陷的力学行为，用超细单元剖分计算模型的方法模拟岩体破坏，同时提出一个利用岩石孔隙率反映细观缺陷的新方法，研究细观缺陷即岩石孔隙率、裂隙倾角及长度等对裂隙岩体力学特性的影响。利用该方法研究了上述两类缺陷对岩质边坡临界滑面(CFS)及安全系数(FS)的影响。结果表明，宏观缺陷对岩体单轴压缩破坏模式、峰值强度和弹性模量起控制作用，同时控制岩质边坡的破坏模式和安全系数；尽管细观缺陷并不能改变宏观缺陷对岩体力学行为的控制作用，但其对这种控制作用将产生一定影响，宏细观缺陷以不同的作用机制对岩体力学特性产生影响。
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| 关 键 词： | 宏、细观缺陷 弹脆性模型 单轴压缩 应力?应变关系 数值模拟 边坡稳定 |
| 收稿时间： | 2018-03-26 |
Influence of macroscopic and mesoscopic flaws on mechanical behavior of rock mass and slope stability |
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| LIU Hong-yan.Influence of macroscopic and mesoscopic flaws on mechanical behavior of rock mass and slope stability[J].Rock and Soil Mechanics,2019,40(Z1):431-439. |
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| Authors: | LIU Hong-yan |
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| Institution: | School of Engineering and Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The rock mass is a natural damage geological body with both macroscopic and mesoscopic flaws. How to accurately assess the co-effect of these two types of flaws on the rock mass mechanical behavior is an important and difficult issue to be solved urgently. The Elastic-brittle model and Null model in FLAC3D code are adopted to describe the mechanical behavior of the intact rock and these two types of flaws respectively, and the superfine element division method is adopted to divide the numerical model to simulate the rock mass failure. Meanwhile a new method of reflecting mesoscopic flaws by rock porosity is developed to investigate the effects of the void ratio, the pre-crack dip angle and length on mechanical behaviors of the fractured rock mass. The proposed method is adopted to study the effects of these two types of flaws on the factor of safety(FS) and critical failure surface(CFS) of rock slope. The results show that the macroscopic flaws control the failure mode, peak strength and elastic modulus of the rock mass under uniaxial compression, and also govern the failure mode and FS of the rock mass slope. Although the mesoscopic flaws can not change the control effect of the macroscopic ones on the mechanical behavior of the rock mass, they do have some influences on this control effect. In sum, the mesoscopic and macroscopic flaws impact on the rock mass mechanical behavior with different action mechanisms. |
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| Keywords: | macroscopic and mesoscopic flaws elastic-brittle model uniaxial compression stress-strain relation numerical simulation slope stability |
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