预应力锚固岩体地震响应规律的离心振动试验分析

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中图分类号：TV531文献标识码：A

Centrifugal Vibration Test Analysis of Seismic Response Laws of Prestressed Rock Mass

ZHAO Yufei 1 ， JIANG Long1，CHEN Xi 2 ， SHANG Jiayi 1 *，LIU Biao1 （1.China Institution of Water Resources and Hydropower Research，Beijing1OOo84，China；2.Economicand Technological Research InstituteState GridHubei ElectricPowerCo.，Ltd.，Wuhan，Hubei 440OO，China）

Abstract： In order to clarify the response paterns of the anchored slope under the variation of seismic acceleration and the specific response process of the anchor cable under the action of earthquakes，by using the centrifugal vibration test equipment configured by the China Water Resources and Hydropower Research Institute，centrifugal model tests were carried out to study the displacement change process of the anchored slope under the action of harmonic seismic waves，as well as the strain response process and patterns of different positions of the anchor cable and different points of the same anchor cable under the action of earthquakes.The research results show that the oscilation frequency of the vertical displacement of the slope and the strain value of the anchor cable is in good synchronization with the input seismic acceleration frequency； the strain and force of the anchor cable show a decreasing state from top to botom，and the anchor cables near the sliding surface need to play a greater reinforcing role. With the increase of seismic intensity，the anchor cable plays a greater reinforcing role，and also demonstrates the passive support function of the anchor cable.This test obtained the analysis of the displacement and response paterns of the slope and anchor cables under the action of earthquakes for the anchored slope， and also verified the strong applicability of the centrifugal model test for the research of such problems.

Key words： prestressed anchor cable；rock slope；seismic load；centrifugal vibration test；displacement change； strain response

预应力锚索技术最早应用于1934年阿尔及利亚舍尔法重力坝改建加高工程，该坝使用了37根预应力锚索进行加固，单孔荷载达106N，其运行20年后测量发现预应力仅损失 3% ，大坝整体稳定性良好[1]。（剩余9294字）