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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年04期

页码:

187-196

栏目:

岩土工程

出版日期:

2025-07-15

文章信息/Info

Title:

Research on load bearing and deformation performance of helical anchor-rock bolt composite foundation

文章编号:

1673-2049(2025)04-0187-10

作者:

马锦元¹,李镜培¹,刘祥国²,崔强³,赵勇⁴,高运兴²

(1. 同济大学 地下建筑与工程系,上海 200092; 2. 国网山东省电力公司泰安供电公司,山东 泰安 271000; 3. 中国电力科学研究院有限公司,北京 102401; 4. 国网山东省电力公司,山东 济南 250001)

Author(s):

MA Jinyuan¹, LI Jingpei¹, LIU Xiangguo², CUI Qiang³, ZHAO Yong⁴, GAO Yunxing²

(1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. State Grid Shandong Electric Power Company Tai'an Power Supply Company, Tai'an 271000, Shandong, China; 3. China Electric Power Research Institute Co., Ltd, Beijing 102401, China; 4. State Grid Shandong Electric Power Company, Jinan 250001, Shandong, China)

关键词:

输电线路基础;  岩石锚杆;  螺旋锚;  抗拔承载力;  数值模拟

Keywords:

transmission line foundation;  rock bolt;  helical anchor;  uplift capacity;  numerical simulation

分类号:

TU432

DOI:

10.19815/j.jace.2024.01093

文献标志码:

A

摘要:

针对山区输电线路工程中“上土下岩”的特殊地质条件,采用新型螺旋锚-岩石锚复合基础形式,利用ABAQUS建立了典型工况下的抗拔承载数值模型,并采用规范方法对单锚的数值计算结果进行验证,分析了双锚复合基础的抗拔承载机理和破坏模式,研究了锚盘数量、锚盘直径、岩石锚杆长度和锚固剂黏结强度对双锚复合基础抗拔承载力的影响。结果表明:双锚复合基础相比单独岩石锚杆基础和单独螺旋锚基础的极限抗拔承载力有一定程度的提升; 双锚复合基础的抗拔过程主要分为加荷初期下部注浆体承担大部分荷载、基础塑性区持续扩大、土岩分界面处的注浆体塑性区贯通、基础达到极限承载状态后失效4个阶段; 增加锚盘数量和一定范围内增加下部基础的长度对双锚复合基础的极限抗拔承载力有较大提升; 增加锚盘直径和提高注浆体与岩体之间的黏结强度对双锚复合基础极限抗拔承载力的提升作用不明显; 复合基础在弹性模量较大的土体中承载力发挥更充分。

Abstract:

In response to the unique geological condition of “soil above and rock below” in mountainous transmission line engineering, a novel type of helical anchor-rock bolt composite foundation was adopted. The numerical model of uplift bearing capacity under typical working conditions was established by ABAQUS, and the numerical calculation results of single anchor were verified by standard method. The uplift bearing mechanism and failure mode of the dual-anchor composite foundation were examined. The impact of anchor plate quantity, anchor plate diameter, rock anchor rod length, and anchoring agent bond strength on the uplift capacity of the dual-anchor composite foundation were investigated. The results show that the ultimate uplift capacity of the dual-anchor composite foundation is moderately increased compared with single rock bolt and single helical anchor foundations. The pull-out process of the dual-anchor composite foundation mainly involves four stages, which are initial loading primarily borne by the lower grouting body, expansion of the foundation's plastic zone, penetration of the plastic zone of the grouting body at the soil-rock interface and reaching the foundation's ultimate bearing state and subsequent failure. Increasing the number of anchor plates and extending the lower foundation within a certain range significantly can enhance the ultimate uplift capacity of the dual-anchor composite foundation. Increasing the anchor plate diameter and improving the bonding strength between the grouting body and the rock mass have no obvious effect on the ultimate uplift capacity of the dual-anchor composite foundation. The bearing capacity of the composite foundation is more fully exerted in the soil with larger elasticity modulus.

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相似文献/References:

[1]王新平,王瑞成,聂少锋,等.微型钢管桩-锚杆新型组合基础承载特性研究[J].建筑科学与工程学报,2024,41(06):152.[doi:10.19815/j.jace.2023.05104]
　WANG Xinping,WANG Ruicheng,NIE Shaofeng,et al.Analysis of load-bearing characteristics of new composite foundation with micro steel pipe pile and anchor[J].Journal of Architecture and Civil Engineering,2024,41(04):152.[doi:10.19815/j.jace.2023.05104]

备注/Memo

备注/Memo:

收稿日期:2024-01-05
基金项目:国家电网有限公司科技项目(5200-202316144A-1-1-ZN)
作者简介:李镜培(1963-),男,工学博士,教授,博士生导师,E-mail:lijp2773@tongji.edu.cn。
Author resume: LI Jingpei(1963-), male, PhD, professor, E-mail: lijp2773@tongji.edu.cn.

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更新日期/Last Update: 2025-07-10