期刊文献+

非静水压力下圆形隧洞围岩塑性区分析 被引量:8

Analysis of elastoplastic interface of circle tunnel under non-hydrostatic loading
下载PDF
导出
摘要 【目的】针对地下圆形洞室承受非静水初始压力作用下的平面应变问题,分析围岩的塑性区范围,为评价围岩稳定性和洞室支护结构的设计提供依据。【方法】对洞室围岩弹塑性边界两侧分别采用复变函数理论和滑移线场理论得出弹性区和塑性区应力组合表达式,根据弹塑性边界上应力相等得到边界方程;通过有限元算例将本研究方法的结果与卡斯特纳等方法的分析结果进行比较,并分析静水压力的变化情况。【结果】弹塑性边界为近似椭圆形,长轴与最大初始应力方向垂直;本研究方法与有限元分析结果更为接近,能够很好地反映洞室围岩塑性区范围;在静水压力下的分析结果与卡斯特纳公式所得塑性区半径一致。【结论】在非静水压力下塑性区全部包围洞室时,本研究方法能够更好地用于指导支护结构设计以及围岩稳定性评价。 【Objective】This study analysed the plastic zone of surrounding rock to overcome the plane strain problem of elastoplastic interface of underground circle tunnel subject to non-hydrostatic initial stress and to provide basis for evaluating surrounding rock stability and designing supporting structure.【Method】In elastic and plastic regions,the combined stress expressions were derived using complex function theory and slip line field theory,respectively.According to continuous stress condition in elastoplastic boundary,the interface equation was determined.Using FEM numerical result as benchmark,the result of proposed method was compared with methods including Kastner method and the change of hydrostatic loading was analyzed.【Result】The elastoplastic boundary was approximately elliptical,with long axis perpendicular to the maximum initial stress.The proposed method was similar to FEM analysis and the results well showed the plastic zone of surrounding rock.The radius of plastic zone under hydrostatic loading was consistent with Kastner method.【Conclusion】When the circular tunnel was completed covered under nonhydrostatic loading,the proposed method could be used to guide the design of supporting structure and e-valuation of surrounding rock stability.
出处 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2015年第4期215-222,共8页 Journal of Northwest A&F University(Natural Science Edition)
基金 国家自然科学基金项目"高温环境下水工引水隧洞围岩与支护衬砌结构受力特点研究"(51179153)
关键词 地下洞室 围岩 塑性区边界 非静水压力 复变函数理论 滑移线场理论 tunnel surrounding rock plastic zone boundary non-hydrostatic loading complex function theory slip line field theory
  • 相关文献

参考文献3

二级参考文献20

  • 1范文,俞茂宏,陈立伟,孙萍.考虑剪胀及软化的洞室围岩弹塑性分析的统一解[J].岩石力学与工程学报,2004,23(19):3213-3220. 被引量:51
  • 2HoekE BrownET.岩石地下工程[M].北京:冶金工业出版社,1986..
  • 3于学馥,地下工程围岩稳定分析,1983年
  • 4严克强,岩土工程学报,1982年,4卷,2期,54页
  • 5郑颖人,地下工程,1980年,3期,1页
  • 6匿名著者,隧道与坑道静力学,1980年
  • 7Chien W Z,Chin J Phys,1947年,7卷,2期,102页
  • 8魏悦广,应用数学和力学
  • 9许东俊.岩石强度随中间主应力变化规律[J].固体力学学报,1985,(1):72-80.
  • 10Jaeger J C,Cook N G W.Fundamentals of rock mechanics[M].London:Chapman and Hall,1976.

共引文献105

同被引文献48

引证文献8

二级引证文献27

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部