长江科学院院报 ›› 2013, Vol. 30 ›› Issue (2): 27-30.DOI: 10.3969/j.issn.1001-5485.2013.02.006

• 岩土工程 • 上一篇    下一篇

微裂隙对工程岩体变形参数的影响分析

范雷1,姜黎2, 胡启芳1   

  1. 1. 长江科学院 水利部岩土力学与工程重点实验室,武汉 430010; 2.中南电力设计院,武汉 430071
  • 收稿日期:2011-09-14 修回日期:2012-02-01 出版日期:2013-02-01 发布日期:2013-02-06
  • 作者简介:范 雷(1982- ),男,河北保定人,高级工程师,博士,主要从事岩石力学试验方面的研究工作
  • 基金资助:

    国家重点基础研究发展计划(973计划)项目(2011CB710603);中央级公益性科研院所基本科研业务费项目(CKSF2011022/YT);水利部公益性行业科研专项经费项目(201001008)

Influence of Microcracks on Deformation Parameters of Engineering Rock Mass

FAN Lei1, JIANG Li2, HU Qi-fang1   

  1. 1.Key Laboratory of Geotechnical Mechanics and Engineering of the MWR, Yangtze River Scientific Research Institute, Wuhan 430010, China;2.Central Southern China Electric Power Design Institute, Wuhan 430071, China
  • Received:2011-09-14 Revised:2012-02-01 Online:2013-02-01 Published:2013-02-06

摘要:

裂隙的大量存在使岩体的变形特性变得非常复杂,而在采用数值分析方法时,常常忽略微裂隙对岩体力学特性的影响。为了明确微裂隙对岩体变形参数的影响,通过变形等效原理,对含单一微裂隙的岩体的变形参数进行估算。计算结果表明:岩体的变形特性与微裂隙倾角、长度和荷载方向有关;微裂隙越长,岩体的变形模量越小,泊松比越大;微裂隙倾角与荷载方向的夹角越小,岩体的各向异性越明显,但是,随着夹角的增大,岩体不同方向上的变形模量逐渐减小,泊松比逐渐增大,岩体的各向异性逐渐减弱,当微裂隙与荷载方向的夹角为45°时,岩体则表现为各向同性。

关键词:  岩石力学, 微裂隙, 柔度矩阵, 变形参数

Abstract:

A large number of cracks have made the deformation properties of rock mass become very complex. However, the effect of these microcracks is often neglected in the research of rock mass deformation properties using numerical simulation method. In order to make clear the effect of theses microcracks on the deformation parameters of rock mass, the deformation parameters of  rock mass that contains one single microcrack are estimated based on equivalent deformation principle. Results show that the deformation characteristics of rock mass are related with the dip angle, the length and also the load orientation of the microcrack. When the length of the microcrack is longer, the deformation module of the rock mass is smaller and the Poisson ratio is bigger. When the intersection angle between the microcrack dip angle and the load orientation is smaller, the anisotropy of rock mass is more evident. Whereas with the increase of this intersection angle, the deformation moduli in different orientations are decreased, the Poisson ratios are increased and the anisotropy of the rock mass is weakened. When the intersection angle between the microcrack dip angle and the load orientation is 45°, the rock mass will be isotropic. 

Key words:  rock mechanics, microcrack, flexibility matrix, deformation parameters  

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