重力锚稳定分析强度折减法与超载系数法对比研究

胡惠华; 王炎; 张奇华; 方强; 程丽娟

doi:10.20174/j.JUSE.2026.01.33

地下空间与工程学报 >

2026 , Vol. 22 >Issue 1: 317 - 326

DOI: https://doi.org/10.20174/j.JUSE.2026.01.33

防灾与环境

重力锚稳定分析强度折减法与超载系数法对比研究

胡惠华 ,
王炎 ,
张奇华 ,
方强 ,
程丽娟

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1.湖南省交通规划勘察设计院有限公司,长沙 410200;
2.中南公路建设及养护技术湖南省重点实验室, 长沙 410200;
3.中国电建集团中南勘测设计研究院有限公司,长沙 410014;
4.中国地质大学(武汉),湖北巴东地质灾害国家野外科学观测研究站,武汉 430074

胡惠华(1965—),男,湖南衡阳人,高级工程师,主要从事工程地质与岩土工程方面的研究工作。E-mail:huhuihua_hnjt@sina.com

收稿日期: 2025-03-16

网络出版日期: 2026-03-03

基金资助

国家自然科学基金(52079129);湖南省交通运输科技进步与创新计划项目(201003, 202119, 202120)

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Comparison Study of Strength Reduction Method and Overloading Coefficient Method of Gravity Anchor Stability Analysis

Hu Huihua ,
Wang Yan ,
Zhang Qihua ,
Fang Qiang ,
Cheng Lijuan

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1. Hunan Provincial Communications Planning, Survey and Design Institute, Changsha 410200, P.R. China;
2. Hunan Provincial Key Laboratory of Highway Construction and Maintenance Technology in Southern China, Changsha 410200, P.R. China;
3. Central South Survey and Design Institute Co., Ltd. of Power China, Changsha 410014, P.R. China;
4. Badong National Observation and Research Station of Geohazards, China University of Geosciences (Wuhan), Wuhan 430074, P.R. China

Received date: 2025-03-16

Online published: 2026-03-03

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摘要

峡谷悬索桥普遍采用重力式嵌岩锚碇,锚碇基底前部齿坎状岩体的抗力作用有利于锚碇的抗滑稳定性。本文依托洞庭溪沅水特大桥北岸重力式嵌岩锚碇基础,对工程设计常用的强度折减法与超载系数法在重力式锚碇稳定评价中的适宜性进行了对比研究。结果表明:强度折减法与超载系数法模拟的工况、力学机制、破坏模式及计算结果存在明显差异;强度折减法模拟岩基力学强度折减工况,随着强度的不断折减,岩基剪切破坏带逐渐贯通,锚碇呈现滑移失稳模式,临滑状态的强度折减系数代表锚碇抗滑动稳定系数;超载系数法模拟主缆超载工况,在不断放大的主缆拉力作用下,锚碇前部岩体大范围压剪破坏,后部岩体小范围拉剪破坏,岩基呈现压剪破坏模式,失稳状态的超载系数代表锚碇的抗拔承载力安全系数;锚碇的抗滑动稳定系数和抗拔承载力安全系数的物理意义不同,后者明显大于前者;当设计需要时可同时采用这两个指标,但应采用不同的设计安全标准;评价重力式嵌岩锚碇的稳定性,应优先采用强度折减法。

关键词： 重力式锚碇; 强度折减法; 超载系数法; 破坏模式; 抗滑动稳定系数; 抗拔承载力安全系数

本文引用格式

胡惠华 , 王炎 , 张奇华 , 方强 , 程丽娟 . 重力锚稳定分析强度折减法与超载系数法对比研究[J]. 地下空间与工程学报, 2026 , 22(1) : 317 -326 . DOI: 10.20174/j.JUSE.2026.01.33

Abstract

The gravity-embedded rock anchorage commonly used in canyon suspension bridges demonstrates that the anti-sliding effect of the tooth-shaped rock mass at the front base effectively enhances anti-sliding stability. This paper relies on the north bank gravity-embedded rock anchorage foundation of Dongtingxi Yuanshui Grand Bridge, comparatively investigates the applicability of two conventional engineering methods strength reduction method and overloading coefficient method in stability evaluation. Results reveal significant differences between these methods in simulated working conditions, mechanical mechanisms, failure modes, and calculation outcomes. Strength reduction method simulates rock strength degradation scenarios. As strength reduction progresses, shear failure zones gradually penetrate the rock foundation, ultimately manifesting sliding instability. The critical strength reduction coefficient represents the anti-sliding stability factor. Overload coefficient method simulates main cable overloading conditions. Under continuously amplified cable tension, the front rock mass experiences extensive compressive-shear failure while the rear rock develops localized tensile-shear failure, exhibiting compressive-shear failure patterns. The critical overload coefficient corresponds to the safety factor of the anti-pull bearing capacity. The physical meanings of anti-sliding stability coefficient and anti-pull bearing capacity safety factor differ significantly, with the latter being notably larger than the former. Both indicators could be adopted simultaneously when required by design specifications, but distinct safety criteria should be applied. For stability assessment of gravity-embedded rock anchorages, the strength reduction method should be prioritized.

Key words： gravity anchorage; strength reduction method; overloading coefficient method; failure mode; anti-sliding stability coefficient; safety factor of pull-out bearing capacity

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