| Earthquake-induced slope instability are often characterized with widedistribution, large quantity, severe damage and etc. According to statistics,since the 20th century, earthquake-induced slope had caused tens ofthousands of people to lose their lives and had brought about billions ofdollars in damage. This makes the issue of slope stability affected byearthquake always be one of the hot research subjects in geotechnical andearthquake engineering as well as a world-wide technical problem. Based onthe Key Project of Hunan Science and Technology Department(2009JT1021),this thesis has finished several tasks as follows:(1)The thesis summarized several research methods and researchprogress in seismic stability analysis of slope and made a discussion on theevaluation indexes of seismic stability.(2) The thesis classified landslide from the perspective of dynamicsand summed up the possible types of deformation damage of slope underseismic loads according to rock mass structure cybernetics throughcombining the field research on Wenchuan earthquake disasters. Meanwhile,the thesis analyzed the cumulative damage mechanism of rock slope inearthquake by using the propagation theory of elastic wave in semi-infinitespace and the theory of fracture dynamics. Based on the mechanism ofset-out violent-slide of slope mass, using the Newmark limited slidingdisplacement calculation method, the simplified formula of muzzle velocitycaused by horizontal fluctuation of slope body was deduced.(3)On the basis of a comprehensive investigation of landslide andcollapse hazard along Dujiangyan-wenchuan section of national highway213 after Wenchuan earthquake, some important characteristics andinstability mechanism of landslide and collapse was obtained throughstatistical analysis.(4) By applying three-dimensional fast Lagrangian method, nonlineardynamic analysis was carried out for Bao Zizui rock slope of K2+640 toK2+824 section in the highway project of Lixian to Xiaojin within Hunanprovince corresponding rebuilding project, the characteristics of control parameters for determining slope stability like stress field, displacementfield, strain field and plastic zone were acquired. Meanwhile, according tothe real-time monitoring records of each monitoring point, the process andrules of dynamic response in displacement, acceleration and speed of rockslope under seismic effect was obtained.(5)The thesis made sensitivity analysis of the major factors thatinfluence the dynamic stability of rock slope by employing orthogonaldesign. |
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