The Susceptibility Of Slope Geo-hazards And Three-dimensional Dynamic Response Analysis Of Typical Dangerous Slopes In Dalian Area

With the rapid development of social economy and the continuous advancement of urbanization,disaster prevention and mitigation has become one of the priorities of relevant government departments and scientific researchers.As the vanguard of the revitalization of the old industrial base in Northeast China,Dalian has a pivotal position.However,due to its hilly and mountainous location and complex geological environment,many slope geological disasters still occur every year,and there are also many hidden dangers of geological disasters.Therefore,it is of great theoretical and practical significance to carry out the research on slope geological disaster prediction and dangerous slope earthquake stability in Dalian,which will contribute to the early warning and disaster prevention and mitigation of geological disasters in Dalian,and provide economic development and safety of people’s lives and property.Strong guarantee.In this paper,the Dalian area is selected to evaluate the susceptibility of slope geological hazards,and three-dimensional seismic dynamic response analysis is carried out for typical dangerous slopes.The thesis work mainly includes the following aspects:(1)Taking the whole area of Dalian as the study area,by collecting data,the engineering geological conditions of the study area,such as topography and landform,stratigraphic lithology,seismic geological structure,hydrometeorology,human activities and slope geological disaster development characteristics,are identified.Comprehensively analyze the geological environmental conditions in the study area,establish an evaluation index system for the susceptibility of slope geological disasters,and develop a CF-LR coupled geological disaster evaluation model by combining the deterministic coefficient and logistic regression evaluation model.(2)On the basis of(1),calculate the CF value of each evaluation index,take it as an independent variable,and use the occurrence of geological disasters as a dependent variable,carry out logistic regression calculation,and obtain the logistic regression coefficients of each evaluation index of slope geological disasters in the study area;Further,carry out slope geological disaster susceptibility evaluation in the study area,and use frequency ratio and ROC curve to test the rationality of the evaluation results.(3)Based on the susceptibility evaluation results,select typical dangerous slopes and generalize the two-dimensional slope model;introduce the strength reduction method into the finite element software ABAQUS,and carry out self-weight conditions,horizontal outward and vertical upward seismic inertial forces,numerical analysis of slope seismic stability under three conditions of seismic inertia force,horizontal outward and vertical downward.The results show that considering both the horizontal outward and vertical upward seismic inertia forces is the most unfavorable load combination case.(4)For the aforementioned dangerous slope,a three-dimensional real slope terrain was established based on DEM data;artificial viscoelastic boundary was added in ABAQUS by using MATLAB program.Research on the dynamic response characteristics(including acceleration,velocity and displacement)of three-dimensional slopes under the action of El Centro seismic waves is carried out.The results show that the dynamic response law of the three-dimensional slope has its unique characteristics,and the horizontal and vertical directions show different characteristics.