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中国青藏高原含软弱夹层预应力锚索支护岩质边坡地震响应研究

Seismic response investigation of prestressed anchor cable supporting rock slope with weak interlayer in Qinghai-Tibet Plateau, China.

作者信息

Fan Yaojiang, Yang Guoxiang, Ye Hailin, Liu Yun

机构信息

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, China.

Beijing Special Engineering Design and Research Institute, Beijing, 100028, China.

出版信息

Sci Rep. 2024 Aug 5;14(1):18088. doi: 10.1038/s41598-024-69291-w.

DOI:10.1038/s41598-024-69291-w
PMID:39103438
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11300609/
Abstract

Earthquake-induced rock landslides in the eastern mountains of the Tibetan Plateau, especially landslides with weak interlayers pose a significant threat to major construction projects. Prestressed anchor cable is one of the main reinforcement methods of rock slopes. This paper combines shaking table model tests and numerical simulation to study the reinforcement effect and dynamic response characteristics of prestressed anchor cables applied to rock slopes with weak interlayers under strong earthquakes. The research results show that prestressed anchor cables can effectively reinforce slopes with weak interlayers. A small cable inclination, a small spacing and a high prestress are recommended in the seismic reinforcement design of prestressed anchor cable. In addition, the characteristics of slope progressive damage and prestress loss under the earthquake are found by the shaking table test. The results have been applied in hazard prevention and control of rock slopes on the Chengdu-Lanzhou Railway at the eastern Qinghai-Tibet Plateau.

摘要

青藏高原东部山区地震诱发的岩石滑坡，尤其是存在软弱夹层的滑坡，对重大建设工程构成重大威胁。预应力锚索是岩石边坡主要的加固方法之一。本文结合振动台模型试验和数值模拟，研究了强震作用下预应力锚索对含软弱夹层岩石边坡的加固效果及动力响应特性。研究结果表明，预应力锚索能有效加固含软弱夹层的边坡。在预应力锚索抗震加固设计中，建议采用较小的锚索倾角、较小的间距和较高的预应力。此外，通过振动台试验发现了地震作用下边坡渐进破坏及预应力损失的特征。研究成果已应用于青藏高原东部成都 - 兰州铁路岩石边坡的灾害防治。

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