Research on Uplift Performance of Short Rock-Socketed Piles Combined with Inclined Anchor Bolts in Rock Mass

HOU Zhongwei; TIAN Lei; XIANG Chengming

doi:10.3724/j.gyjzG23070803

Volume 55 Issue 6

Jun. 2025

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HOU Zhongwei, TIAN Lei, XIANG Chengming. Research on Uplift Performance of Short Rock-Socketed Piles Combined with Inclined Anchor Bolts in Rock Mass[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(6): 243-250. doi: 10.3724/j.gyjzG23070803

Citation:

HOU Zhongwei, TIAN Lei, XIANG Chengming. Research on Uplift Performance of Short Rock-Socketed Piles Combined with Inclined Anchor Bolts in Rock Mass[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(6): 243-250. doi: 10.3724/j.gyjzG23070803

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Research on Uplift Performance of Short Rock-Socketed Piles Combined with Inclined Anchor Bolts in Rock Mass

doi: 10.3724/j.gyjzG23070803

1. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China;
2. State Nuclear Power Planning and Design Institute Chongqing Co., Ltd., Chongqing 401120, China

Received Date: 2023-07-08

Abstract

Abstract

Numerical calculation models for a new-type composite foundation of electricity transmission lines in mountainous areas were established， consisting of a short rock-socketed pile and three inclined anchor bolts. The uplift performance of the composite foundation was simulated and compared to that of rock-socketed short piles without anchor bolts. The characteristics of the uplift load-displacement curves were analyzed， as well as the distribution patterns and features of stress in the rock mass and pile concrete. In addition， the influence of the connected position between inclined anchor bolts and short piles on the uplift performance of the foundation was also investigated. In general， the uplift load-displacement curves of the composite foundation approximately exhibited three typical regions： an initial linear region， a curvilinear transition， and a final linear region. The anchoring effect of inclined anchor bolts transfered the uplift load to deeper and more extensive rock masses around the foundation， thereby improving the uplift bearing capacity of the composite foundation. The concrete section of the pile at the anchor connection position was in an overall tensile stress state， but there was a partial compressive stress zone in the concrete near the connection position between anchor bolts and was short piles. By optimizing the length of inclined anchor bolts and the anchor connection position， it is possible to reduce the embedment depth of a rock-socketed pile while still meeting the same uplift capacity requirements for the foundation. As a result， the difficulty of foundation construction can be effectively reduced， achieving significant safety and economic benefits.
- composite foundation with inclined anchor bolts and short rock-socketed piles,
- transmission lines,
- uplift,
- numerical simulations,
- rock foundation

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References(27)

References

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