|Table of Contents|

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

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

Issue:
2025年04期
Page:
187-196
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on load bearing and deformation performance of helical anchor-rock bolt composite foundation
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)
Keywords:
transmission line foundation;  rock bolt;  helical anchor;  uplift capacity;  numerical simulation
PACS:
TU432
DOI:
10.19815/j.jace.2024.01093
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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Last Update: 2025-07-10