中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2018, Vol. 37 ›› Issue (06): 63-68.DOI: 10.3969/j.issn.1674-0696.2018.06.10

• 港口航道·水利水电·资源环境 • 上一篇    下一篇

顺层岩质边坡溃屈型破坏探讨

张登项,唐川,唐秋元   

  1. (中煤科工集团重庆设计研究院有限公司 岩土工程院,重庆 400042)
  • 收稿日期:2017-04-06 修回日期:2017-09-18 出版日期:2018-06-12 发布日期:2018-06-12
  • 作者简介:张登项(1982—),男,重庆人,工程师,硕士,主要从事岩土勘察与设计方面的研究。E-mail:664059663@qq.com。

Discussion on Yield Failure of Bedding Rock Slopes

ZHANG Dengxiang,TANG Chuan,TANG Qiuyuan   

  1. (Geotechnical Engineering Insitute,CCTEG Chongqing Engineering Co.,Ltd,Chongqing 400042,P.R.China)
  • Received:2017-04-06 Revised:2017-09-18 Online:2018-06-12 Published:2018-06-12

摘要: 顺层边坡溃屈破坏是一种存在于岩质边坡的特殊破坏模式,首先对这种破坏模式的力学原理进行了探讨,得出了产生此破坏模式的前提条 件,即:存在外倾结构面;结构面倾角较陡,大于或等于坡角;坡脚岩体强度较差。结合一典型的岩质边坡开挖工程实例,运用离散元数值分析 方法,得到了边坡发生此破坏模式的变形、应力特征以及具体的破坏过程。结果表明:边坡坡脚的剪应力随着边坡开挖的深度增加而增大;当其 剪应力未超过坡脚岩体的抗剪强度时,边坡变形主要以开挖的卸荷回弹为主,边坡处于稳定状态;当开挖深度使得坡脚剪应力超过坡脚岩体的抗 剪强度时,坡脚岩体首先产生屈服变形,发生较大的位移,从而为坡体中上部岩体提供了沿结构面下滑的空间,边坡发生垮塌。数值分析结果与 理论分析得到了很好的验证。

关键词: 岩土工程, 溃屈, 陡倾顺层, 离散元, 顺层岩质边坡

Abstract: Yield failure that occurs in bedding rock slopes is a special failure mode.At first,the mechanical mechanism of this mode of damage was explored,and the preconditions to generate this type mode of damages were obtained.Namely,in addition to the structural plane inclined slope,the steep angle of the structural plane,larger or equal to the inclined angle,and poor strength of rock body at slope foot were also determined to be factors.The slope deformation in this damage mode,stress characteristics,and specific damage processes were obtained by means of the discrete element numerical analysis method.The results show that the shear stress at the foot of the slope increases with increased depth of slope excavation,and when the shear stress did not exceed the shear capacity of rock at slope foot the slope deformation mainly occurred in the form of unloading-rebounding and the slope was in stable state.When the excavation depth caused the shear stress on the slope foot to exceed the shear capacity of the rock at the slope foot,the rock at the slope foot firstly underwent yield deformation and great displacement so as to provide space for the middle and upper rock on the slope to slide down along the surface of the slope,and the slope collapsed occurred.Numerical analysis results and theoretical analysis were well validated.

Key words: geotechnical engineering, yield failure, steep bedding slope, discrete element, bedding rock slope

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