Seismic stability analysis of bidirectional jointed rock slope

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-03-04 DOI:10.1007/s10064-025-04188-0

Haiying Fu, Yanyan Zhao, Mingzhe Zhou, Qilin Li

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Abstract

The southwestern region of country is characterized by its complex topography and high average elevation, with numerous jointed rock slopes. Additionally, the intricate terrain of high-altitude areas frequently results in seismic activity. This paper is based on the #1 tunnel slope project in the region, employing both shake table experiments and numerical simulations to analyze the failure modes of the jointed rock slope under seismic conditions and the stability of the jointed rock slope under different parameters. The integrated evaluation method was used in this paper to evaluate the dynamic stability of the slope, which considered both the seismic permanent displacement method and the Dynamic Strength Reduction Method. The specific conclusions are as follows: (1) The failure process of the jointed rock slopes was categorized into three distinct stages: local shear slip, slip surface formation and complete failure. The failure mode was summarized as shear slip failure occurring along the joint surfaces, accompanied by the collapse of locally fragmented rock masses. (2) the slope angle emerged as a significant factor influencing the failure mode of jointed rock slopes. Larger slope angles, greater joint dip angles and smaller joint spacings correlated with increased failure severity and diminished stability. (3) the maximum permanent displacement is positively correlated with both the slope angle and joint dip angle.

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双向节理岩质边坡地震稳定性分析

我国西南地区地形复杂，平均海拔高，节理岩质边坡较多。此外，高海拔地区复杂的地形经常导致地震活动。本文以该地区1号隧道边坡工程为基础，采用振动台试验和数值模拟相结合的方法，分析了地震条件下节理岩质边坡的破坏模式和不同参数下节理岩质边坡的稳定性。本文采用综合考虑地震永久位移法和动力强度折减法的边坡动力稳定性综合评价方法。具体结论如下：(1)节理岩质边坡的破坏过程可分为局部剪切滑移、滑面形成和完全破坏三个阶段。其破坏模式为沿节理面发生剪切滑移破坏，并伴有局部破碎岩体的崩塌。(2)坡角是影响节理岩质边坡破坏模式的重要因素。边坡倾角越大，节理倾角越大，节理间距越小，破坏程度越严重，稳定性越差。(3)最大永久位移与边坡角和节理倾角均呈正相关。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.