土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (2): 272-279.

• 专题论述 • 上一篇    下一篇

基于Phase2的宕渣堆场开挖稳定性强度折减法分析

张皓然1,2，张金涛1,2   

  1. （1.三峡库区地质灾害教育部重点实验室，湖北宜昌 443002；2.防灾减灾湖北省重点实验室，湖北宜昌 443002）
  • 收稿日期:2024-07-05 修回日期:2024-07-12 出版日期:2025-04-30 发布日期:2025-06-03
  • 作者简介:张皓然(1999-)，男，硕士研究生，研究方向为岩土力学与工程。
  • 基金资助:
    国家自然科学基金（基金号：52079070）

Evaluation on the Stability of Excavated Slope for a Waste Rock Storage Yard Using Strength Reduction Method in Phase 2 Software

ZHANG Haoran1,2， ZHANG Jintao1,2   

  1. (1.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang 443002；
    2.Hubei Key Laboratory of Disaster Prevention and Mitigation, Yichang 443002)
  • Received:2024-07-05 Revised:2024-07-12 Online:2025-04-30 Published:2025-06-03

摘要： 开挖堆积时间较久的宕渣堆场获取宕渣资源，是固废资源化利用的重要途径之一，由此带来的宕渣堆场开挖稳定性问题值得重视。依托宁波市某宕渣堆场开挖外运工程，基于Phase2软件使用强度折减法评价自然放坡坡率1∶3、自然放坡坡率1∶2和台阶放坡三种开挖方案下边坡的稳定性，比较考虑与不考虑开挖卸荷效应的边坡稳定性评价结果。研究发现，Phase2软件可有效获取宕渣堆场开挖后边坡的回弹变形和应力重分布行为；与考虑开挖卸荷效应相比，未考虑开挖卸荷效时边坡稳定系数结果增大可达10%。因此，实际工程中不考虑开挖卸荷效应存在高估宕渣堆场开挖边坡安全储备的风险。

关键词: 宕渣堆场, 边坡稳定性, 开挖卸荷效应, 强度折减法

Abstract: Obtaining the useful rock material from a waste rock storage yard that has been operated for an extended period is a crucial method for the utilizing waste resources. The stability of excavated waste rock storage yards is a significant factor to consider. This study focuses on the excavation and the transportation project of a waste rock storage yard in Ningbo City. The stability of conditions of slopes under three different excavation schemes: slope rate 1H:3.0V, slope rate 1H:2.0V, and stepped slope are evaluated. The strength reduction method in Phase2 software is utilized for this assessment. A comparison is conducted between the stability evaluation results of slopes with and without excavation unloading effects. The study demonstrates that the Phase2 software can effectively capture the rebound deformation and the stress redistribution behavior of slopes post-excavation of the waste rock storage yards. The stability factors increase by 10% when disregarding the excavation unloading effect, compared to when accounting for it. Hence, when evaluating the stability of excavation slopes in the waste rock storage yards, failing to consider the excavation unloading effect may result in an overestimation of the safety margins or reserves, potentially posing a risk hazard.

Key words: Waste Rock Storage Yard, Slope Stability, Excavation Unloading Effect, Strength Reduction Method

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