| As a common type of slope encountered in slope engineering,soft and hard interbedding slopes account for a large proportion of slopes,especially in the southwest of China.Compared with slopes composed of a single lithology,soft and hard interbedded slopes are composed of two or more rock layers with different lithology arranged in each other.With the advancement of large-scale engineering construction in the southwest region of China,it is inevitable to encounter the above-mentioned rock masses,and the southwest region is located in the high seismic intensity seismic zone of China.Therefore,it is necessary to further study the dynamic stability factors and deformation and failure mode types of soft and hard interbedded slopes.Therefore,this paper mainly considers 7 factors,including slope angle,rock stratum inclination,slope height,total thickness of adjacent soft and hard rock strata,thickness ratio of adjacent soft and hard rock strata,mechanical parameter ratio of hard rock to soft rock,and structural plane parameters.Through FLAC3 D finite difference software,the safety factor and displacement magnitude under different combinations of factors under static and seismic action are obtained,Through range analysis and variance analysis in statistical methods,the magnitude of the impact of different influencing factors on slope stability has been revealed,and the failure modes of slopes with different rock stratum inclinations under earthquake action have been simulated.Finally,the following understandings have been obtained:(1)For the safety factor,the most important factor under static and seismic action,whether using range analysis or variance analysis,is the slope angle and height of the slope.As the horizontal values of the two increase,the safety factor decreases significantly,and the interaction between the inclination angle and the slope angle has a significant impact on the safety factor of the slope.(2)For slope displacement,slope height plays a decisive role in slope displacement under static action.Under earthquake action,the biggest factor affecting the displacement of soft and hard interbedded slopes is structural plane parameters.As the strength of structural plane parameters increases,the slope displacement significantly decreases,and slope angle and height also have a significant impact on the displacement.As the slope height increases,the displacement gradually increases;As the slope angle increases,the displacement first increases and then decreases.The maximum displacement in the middle of the slope and at the top of the slope both occur when the slope angle is taken as 40 °.(3)For the dynamic response of soft and hard interbedded slopes under different rock strata dip angles,except for the poor stability of moderately inclined layered soft and hard interbedded slopes,other types of soft and hard interbedded slopes have good stability under earthquake action.(4)The response of soft and hard interbedded slopes to seismic waves of different amplitudes and frequencies is different.For the amplitude,the displacement of the slope increases as the amplitude increases;However,in terms of frequency,its impact on slope displacement is related to the natural vibration frequency of the slope.As the frequency approaches the natural vibration frequency of the slope,the displacement will continuously increase,and as the frequency moves further away from this value,the slope displacement will gradually decrease. |
