Abstract:

The wedge failure is one of the common forms of slope failures. In this study, the authors investigate the sliding responses of rock wedges under dynamic loads rather than the initiation of wedge sliding. Firstly some laboratory model tests are described. On the basis of these model tests on rock wedges, the theoretical model proposed previously is extended to compute the sliding responses of rock wedges in time domain. The proposed theoretical model is applied to simulate the sliding responses of rock wedge model tests and its validity is discussed. In the final part, the method proposed is applied to actual wedge failures observed in 1995 Dinar earthquake, 2007 Çameli earthquake and 2005 Pakistan-Kashmir earthquake, and the results are discussed.

1 Introduction

The stability of rock slopes under dynamic loading in mining and civil engineering depends upon the slope geometry, mechanical properties of rock mass and discontinuities, and the characteristics of dynamic loads with time (Aydan 2015). The wedge failure is one of the common forms of rock slope failures (Fig. 1).

In this study, the sliding responses of rock wedges under dynamic loads rather than the initiation of wedge sliding are investigated. Firstly some laboratory tests on model wedges are described. On the basis of these model tests on rock wedges, the theoretical models developed by Aydan and Kumsar (2010) are used to compute the sliding responses of rock wedges in time domain. In the final part, the method is applied to actual wedge failures observed in 1995 Dinar earthquake, 2007 Çameli earthquake and 2005 Pakistan-Kashmir earthquake, and the results are discussed.

2 Dynamic Model Tests
2.1 Preparation of Models

Six special moulds were prepared to cast model wedges (Kumsar et al. 2000). For each wedge configuration, three wedge blocks were prepared. Each base block had dimensions of 140x100x260mm. Base and wedge models were made of mortar and their geomechanical parameters were similar to those of rocks.

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