设计、施工、监测

高地应力地下厂房围岩开挖损伤区形成机理研究

  • 谭洲 ,
  • 李彪 ,
  • 李鹏 ,
  • 林开盛 ,
  • 苏海健
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  • 1.西南石油大学 地球科学与技术学院,成都 610065;
    2.四川大渡河双江口水电开发有限公司,四川 马尔康 624099;
    3.中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116
谭洲(1999—),男,重庆人,硕士生,主要从事地下工程等领域的研究工作。E-mail:tanz1999@163.com
李彪(1990—),男,山东菏泽人,博士,副教授,主要从事岩石力学、地下工程等领域的教学与科研工作。E-mail:libiaoscu@163.com

收稿日期: 2024-04-20

  网络出版日期: 2025-01-03

基金资助

国家自然科学基金(42277461, 42077240);四川省科技计划项目(2023NSFSC0812)

Study on the Formation Mechanism of Excavation Damage Zone of Surrounding Rock of the Underground Powerhouse under High Geostress

  • Tan Zhou ,
  • Li Biao ,
  • Li Peng ,
  • Lin Kaisheng ,
  • Su Haijian
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  • 1. School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610065, P. R. China;
    2 Sichuan Daduhe Shuangjiangkou Hydropower Development Co., Ltd., Ma'erkang, Sichuan 624099, P. R. China;
    3. State Key Laboratory of Deep Geotechnical Mechanics and Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

Received date: 2024-04-20

  Online published: 2025-01-03

摘要

以大渡河双江口水电站地下厂房为研究对象,基于单孔声波测试结果,分析了高地应力条件下洞室开挖卸荷围岩波速曲线特征,确定了围岩开挖损伤区(EDZ)的范围,总结得到了应力重分布影响、临近爆破影响的围岩EDZ演化规律以及不同区域围岩EDZ的特征。采用有限差分数值分析方法研究EDZ形成机理,揭示了在高地应力条件下爆破荷载、地应力瞬态卸荷荷载以及应力重分布三因素在单独和耦合作用下对围岩EDZ的影响。研究结果可为地下洞室安全评价与支护参数优化提供技术支撑。

本文引用格式

谭洲 , 李彪 , 李鹏 , 林开盛 , 苏海健 . 高地应力地下厂房围岩开挖损伤区形成机理研究[J]. 地下空间与工程学报, 2024 , 20(6) : 1979 -1990 . DOI: 10.20174/j.JUSE.2024.06.24

Abstract

Taking the underground powerhouse of the Dadu River Shuangjiangkou Hydropower Station as a research object, using single-hole acoustic wave tests to investigate the wave velocity attributes of the unloaded perimeter rock post-cavern excavation under high geostress. This evaluation allows us to pinpoint the extent of the Excavation Damage Zone (EDZ) within the perimeter rock and discern its evolutionary patterns under the influences of stress redistribution and proximity blasting, along with understanding the unique traits of the EDZ across varied regions. By leveraging the finite difference numerical analysis method, we probe into the mechanisms of EDZ formation. This approach exposes the implications of blasting load, transient geostress unloading, and stress redistribution on the EDZ of the surrounding rock under high geostress conditions, considering both individual and concurrent effects of these factors. The findings of this research hold significant theoretical and practical merit, offering crucial technical insights for enhancing the safety evaluations.

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