A Study on the Response of Country Rock of Grottoes Reinforced by Prestressed Anchors During Seismic Loadings

Abstract eng:
In this paper, the authors research the response of grottoes’ country rock with prestressed anchors during seismic loadings by a numerical analysis method. Its primary objective is to advance our understanding on the stability of country rock of grottoes while an earthquake occurs. It is well know that prestress anchors can enhance the strength of grottoes’ country rock. During a seismic loading, e.g. an earthquake event, however, the reinforcing capability of prestressed anchors is still a question. Here we choose three models in two-dimension to analyze the stability of country rock reinforced by prestressed anchors, which all are in the north region of Mogao Grottoes, Dunhuang of Gansu province, China. As a result of numerical analysis of displacement and stress field during seismic loadings with different peak ground acceleration (PGA), spectra and durations, we understand the characteristics of dynamic response and vibration regularity of rock mass reinforced by prestressed anchors better than before. Furthermore, some other results reveal that displacement and stress of rock mass increase, range of stress concentration expands, and the damages probability of country rock goes up with the increase of PGA, characteristic period and duration of seismic loads. The authors believe that this paper could provide a theoretical basis and a practical reference for the preservation of grotto relics and seismic retrofit and seismic hazard mitigation for rock mass.

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