顺层岩质边坡的溃屈和倾倒机制研究及工程分析

幸芊; 洪兆远; 刘成章; 谢新春; 刘剑

doi:10.20265/j.cnki.issn.1007-2993.2023-0945

顺层岩质边坡的溃屈和倾倒机制研究及工程分析

doi: 10.20265/j.cnki.issn.1007-2993.2023-0945

幸芊^{1, 2,},
洪兆远¹,
刘成章¹,
谢新春¹,
刘剑¹

1.
中机中联工程有限公司，重庆　400039
2.
重庆交通大学土木工程学院，重庆　400074

基金项目: 重庆市高新技术企业科技研发项目（RD2021009）；中机中联工程有限公司科研项目（KY202112）

详细信息

作者简介:
幸　芊，男，1981年生，硕士，教授级高级工程师，主要从事岩土与地下工程研究。E-mail：39434721@qq.com

中图分类号: TU457
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- 文章访问数: 41
- HTML全文浏览量: 10
- PDF下载量: 18
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-29
- 修回日期: 2024-04-19
- 录用日期: 2024-05-09
- 网络出版日期: 2025-04-07
- 刊出日期: 2025-04-08

Engineering analysis on the mechanisms of buckling and toppling of bedding rock slope

1.
CMCU Engineering Co., Ltd., Chongqing 400039, China
2.
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

摘要

摘要: 大量工程实践表明，非滑动破坏的顺层边坡可能存在溃屈和倾倒的变形、破坏机制。为研究两种特殊机制的产生机理和支护方案，通过离散元数值模拟方法和典型工程项目的相关数据分析，结合层状岩体的破坏试验，研究了顺层边坡产生溃屈和倾倒的基本条件及变形、破坏规律。结果表明：对于顺层高边坡，当边坡坡角与岩层层面倾角相同或接近时，在表层层状岩体自重作用下，坡脚可能出现屈服并产生浅表垮塌，进而引发边坡产生溃屈破坏；当边坡坡角小于岩层层面倾角时，边坡可能产生倾倒变形；顺层边坡倾倒变形与后续的破坏模式需分开看待，最终的破坏形式受边坡变形演化的影响，存在动态变化过程。对于存在溃屈和倾倒变形破坏机制的顺层岩质边坡，建议在坡脚设置大刚度支撑结构进行支护。
- 顺层岩质边坡 /
- 溃屈模式 /
- 倾倒变形 /
- 破坏机理 /
- 离散元
Abstract: A large number of engineering practices show that the deformation and damage mechanisms of toppling and buckling may exist in the non-sliding damaged bedding slopes. To study the generation mechanism and support scheme of two special mechanisms, the basic conditions, deformation, and failure laws of bedding slopes were studied through discrete element numerical simulation method and relevant data analysis of typical engineering projects, combined with failure tests of layered rock masses. The results show that: for high-rise slopes, when the slope angle is the same or close to the dip angle of the rock layer, the foot of the slope may yield and shallow collapse under the self-weight of the surface layered rock mass, leading to the buckling failuare of the slope; when the slope angle is smaller than the dip angle of the rock layer, the slope may undergo toppling deformation; the toppling deformation and subsequent failure modes of layered slopes need to be viewed separately, and the final failure form is influenced by the evolution of slope deformation and undergoes dynamic changes. For layered rock slopes with mechanisms of buckling and toppling deformation, it is recommended to install high-stiffness support structures at the foot of the slope for support.
- bedding rock slope /
- buckling failure mechanism /
- toppling deformation /
- destruction mechanism /
- discrete element

HTML全文

图 1 顺层边坡倾倒和溃屈破坏案例

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图 2 试件破坏形态素描

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图 3 边坡典型溃屈失稳变形

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图 4 溃屈失稳边坡的位移及稳定系数分布规律

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图 5 边坡典型溃屈失稳剪应变分布

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图 6 边坡典型倾倒变形

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图 7 倾倒机制边坡的稳定系数分布规律

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图 8 边坡典型倾倒变形机制下剪应变分布

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图 9 边坡典型倾倒变形机制下塑性区分布

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图 10 顺层边坡倾倒变形及破坏特征

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图 11 倾倒变形边坡的锚索支护示意图

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图 12 坍塌区状况图

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图 13 数值计算破坏特征与实际坍塌特征对比图

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图 14 典型剖面位移监测

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图 15 边坡最大剪应变分布与物探破碎带对比图

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表 1 岩体及层面参数

类别密度
/(kg·m⁻³) 法向刚度
/(Pa·m⁻¹) 切向刚度
/(Pa·m⁻¹) c
/kPa φ
/(°)

层面 2450 5e9 2e9 60 24

岩体 700 33

下载: 导出CSV

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