土工基础 ›› 2021, Vol. 35 ›› Issue (6): 732-736.

• 专题论述 • 上一篇    下一篇

基于赤平极射投影法的岩质边坡稳定性评价

陈元勇,唐友山,张 先   

  1. (江西交通职业技术学院,南昌 330013)
  • 收稿日期:2021-03-15 修回日期:2021-03-19 出版日期:2021-12-30 发布日期:2021-12-24
  • 作者简介:陈元勇(1991-),男,助教,硕士研究生,研究方向为地质灾害防治。
  • 基金资助:
    江西省教育厅科学技术研究重点项目(GJJ204602)

Application of Stereographic Projection in the Stability Evaluation of Rock Slopes

CHEN Yuanyong, TANG Youshan, ZHANG Xian   

  1. (Jiangxi V & T College of Communications, Nanchang 330013)
  • Received:2021-03-15 Revised:2021-03-19 Online:2021-12-30 Published:2021-12-24

摘要: 陕西金堆城采矿场南帮受断层、节理等地质构造的影响,随着后期的不断开挖致使坡体上存在多处规模不等的单台阶、局部多台阶的滑塌、崩塌和掉块现象。南帮主要岩性为石英岩、板岩和安山玢岩,不同岩性边坡稳定性差异明显。根据现场边坡工程勘察的资料,结合赤平极射投影法对南帮边坡分岩质分段进行稳定性分析,并预判边坡可能发生的变形破坏情况。西段为石英岩边坡,L1结构面引起边坡单台阶破坏,L1与L2两结构面形成不利组合,使边坡发生楔形体破坏。中段边坡为板岩,L1结构面与边坡坡面呈小角度相交,易引发边坡掉块或顺坡滑移现象。东段岩性为安山玢岩,L2结构面倾角小于单台阶坡角,表层较破碎的安山玢岩易沿着此组外倾结构面发生滑移。

关键词: 岩质边坡, 稳定性, 结构面, 赤平极射投影

Abstract: Under the influence of fault and rock joints, the local rock slope failures at south portion of Jinduicheng Mine are frequently occurred. The failure modes include rock sliding, rock burst and rock fall. The lithology of the south bank of the rock slope consists of quartzite, slate and Anshan siltstone. The stability of rock slopes in different rock lithology is significantly different. Based on the geotechnical investigation result for the rock slope, the rock slope stability of south portion was evaluated using stereographic projection method and the potential locations of the instability of these rock slopes were predicted. The quartzite rock slope is mainly encountered in the west side. The single step sliding failure mode was identified by L1 structural plane. The combination of rock joints of L1 and L2 would lead to a wedge failure mode. The middle portion of slope consists of slate rock. The joint L1 is daylighting with the rock slope at a small angle so that the sliding failure potential existed. The Anshan siltstone rock slope is found at the east portion. The L2 joint set is less than the slope angle of the step so that the broken siltstone at the surface sliding failure might be occurred along this plane.

Key words: rock slopes, stability, structural plane, stereographic projection

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