长江科学院院报 ›› 2021, Vol. 38 ›› Issue (11): 102-107.DOI: 10.11988/ckyyb.20200743

• 岩土工程 • 上一篇    下一篇

掏挖与岩石锚杆复合型基础上拔承载机理和影响因素研究

毛丽荣1, 郑众安2, 吴建勇1, 吴群雄1, 李晓军2, 林和2, 苏军峰1, 邱小平2, 曹夕祥1, 孙义舟3   

  1. 1.国网浙江省电力有限公司丽水供电公司,浙江 丽水 323000;
    2.丽水市正阳电力设计院有限公司,浙江 丽水 323000;
    3.浙江大学 建筑工程学院,杭州 310058
  • 收稿日期:2020-07-27 修回日期:2020-12-30 出版日期:2021-11-01 发布日期:2021-11-08
  • 通讯作者: 孙义舟(1995-),男,北京人,硕士研究生,主要从事岩土工程研究。E-mail: 21812016@zju.edu.cn
  • 作者简介:毛丽荣(1973-),男,浙江庆元人,工程师,高级经济师,主要从事电网规划、建设等研究。E-mail:qyepc@126.com
  • 基金资助:
    国网浙江省电力有限公司技术项目(5211LS18005M)

Uplift Bearing Mechanism and Parameter Influence of Excavation and Rock Bolt Composite Foundation

MAO Li-rong1, ZHENG Zhong-an2, WU Jian-yong1, WU Qun-xiong1, LI Xiao-jun2, LIN He2, SU Jun-feng1, QIU Xiao-ping2, CAO Xi-xiang1, SUN Yi-zhou3   

  1. 1. Lishui Power Supply Company of State Grid Zhejiang Electric Power Co., Ltd., Lishui 323000, China;
    2. Lishui Zhengyang Electric Power Design Institute Co., Ltd., Lishui 323000, China;
    3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
  • Received:2020-07-27 Revised:2020-12-30 Online:2021-11-01 Published:2021-11-08

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摘要： 针对掏挖与岩石锚杆复合型基础上拔承载机理不明确的问题,基于现场试验工况,利用Plaxis3D有限元软件建立复合型基础抗拔承载模型,研究其上拔承载机理。在此基础上,研究了土体弹性模量、岩体弹性模量、土体黏聚力对复合型基础各部分的承载影响,分析了掏挖基础和岩石群锚基础的承载力发挥情况、上拔变形、塑性区开展,并给出了复合型基础的改进方案。结果表明:上拔变形刚度较大的岩锚基础对复合型基础的承载极限状态起控制作用;掏挖基础和岩石锚杆基础的上拔变形协调性是影响复合型基础承载力发挥的关键;适当增加掏挖基础嵌入岩石的深度可有效提高复合型基础的抗拔承载力。

关键词: 复合型基础, 掏挖基础, 岩石锚杆基础, 抗拔承载力, 数值分析, 变形协调

Abstract: The bearing mechanism of the composite foundation of excavation and rock bolt was unclear. In view of this, an analytical model of the uplift bearing capacity of the composite foundation was established using Plaxis3D based on field test conditions to probe into the uplift bearing mechanism of the composite foundation foundation. The influences of soil elastic modulus, rock elastic modulus, and soil cohesion on the bearing capacity of each part of the composite foundation were examined. The bearing capacity, uplift deformation, and plastic zone development of excavation foundation and rock bolt were analyzed. The improved design of the composite foundation was also given. Results demonstrate that the rock bolt with large deformation stiffness controls the ultimate state of uplift bearing of the composite foundation; the deformation compatibility between excavation foundation and rock bolt is the key to the bearing capacity of the composite foundation. Increasing the depth of the excavation foundation embedded in rock can effectively improve the pull-out bearing capacity of the composite foundation.

Key words: composite foundation, excavation foundation, rock bolt foundation, uplift bearing capacity, numerical analysis, deformation compatibility

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