A centrifuge study on effects of rock dip angle on toppling deformation of anti-dip layered rock slopes
Toppling deformation is a typical form of damage observed in anti-dip layered rock slopes.To investigate the impact of different rock dip angles on the toppling deformation of anti-dip layered rock slopes,we utilized the toppling deformation body in front of the dam of Gushui Hydropower Station in the upper reaches of Lancang River as a prototype.Based on the large-scale geotechnical centrifuge test,the failure process,deformation evolution characteristics,and final failure mode of the anti-dip lay-ered rock slope were analyzed and studied from the perspective of the change of rock stratum dip angle.The outcomes are conduc-ted as follows:① The change of rock dip angle does not affect the stage evolution process of the slope,which can be summarized as rock compaction-crack development at slope toe,formation of bending plane in slope-partial instability,and penetration of bending plane-rock mass complete instability.②The larger the dip angle of the rock stratum,the faster the formation of the ben-ding plane of the slope,the deeper the penetrated toppling failure of the slope after the instability failure occurs,the larger the cor-responding deformation range,and the more severe the damage degree of the broken rock stratum.③The change of rock dip angle will lead to a certain difference in the toppling deformation process and the final instability mode of the slope.For model slopes with small dip angles of 55°and 70°,the front rock strata of the slopes undergo obvious bending and toppling deformation under gravity,and finally fail in an instability mode of"toppling-bending-slip".The bending deformation of the slope with the largest dip angle of 85°is small,and finally,it is destroyed in a mode of"toppling-breaking-collapse".The results can provide signifi-cant guidance for the implementation of large-scale engineering projects.
toppling deformationanti-dip layered rock slopedamage modebreaking planecentrifuge model experimentGushui Hydropower Station
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维普
