| Slope,one of the most common engineering forms in human construction engineering and mining engineering.is formed by excavation or filling in construction of construction engineering and mining engineering.With the increasing human ability to transform the nature,the scale of construction and mining projects is becoming larger and larger,forming deep and large mining pits and slopes,the stability of which has become an inevitable safety problem.Presently,in view of the slope instability problem,the traditional survey means are mainly used.The conventional means such as geological mapping,remote sensing mapping,drilling and excavation are used to obtain limited geological information,and the stability evaluation of the slope instability is completed with the help of numerical simulation analysis method.However,due to the limited geological data obtained by traditional survey means,the lack of continuous three-dimensional underground spatial information,and the complex geological structure of the unstable geological body itself,there will inevitably be a great difference between the numerical simulation geological conditions and the actual geological conditions,resulting in the inaccurate evaluation of the slope instability state.Based on the instability of the slope rock mass geophysical properties,geophysical prospecting method has been used to study the characteristics of geophysical field slope instability in this paper,combined with evolution mechanism of the slope unstability.The correlation mechanism between geophysical characteristics of slope rock and soil mass and engineering mechanical parameters is constructed,and a set of theories and methods based on the characteristics of geophysical field of unstable slope are established to identify and describe the spatial distribution law of slope mass.Finally,geophysical exploration technology can be used to enrich the geological information of the unstable slope and improve the accuracy of stability evaluation.The research contents and achievements of this paper are as follows:1.By studying the engineering geological characteristics,evolution mechanism and stability evaluation results of slope failure,this paper has summarized the engineering geological characteristics,evolution process of slope failure,formation conditions,leading factors and manifestations of three typical slope types,including rock slope,soil slope and rock composite slope.And the main factors affecting the evaluation of slope stability and the evaluation methods are discussed.2.By studying the relationship between the geophysical response characteristics of rock and soil mass and its property characteristics such as porosity,water content and saturation,the correlation with engineering mechanical parameters is established,so as to realize the quantitative interpretation of geophysical exploration.On the basis of parameter quantification,the geophysical models of soil slope,soil-rock composite slope and rock slope are constructed.3.Based on the cases of Bayan Obo Iron Mine and expressway slope,the characteristics of geophysical anomalies are analyzed and summarized.Combined with the geological mapping and engineering investigation data,the characteristics of the shape,scale and structure of the slope body are determined,the three-dimensional geological model is constructed,and the evolution mechanism of the slope is analyzed.Meanwhile,combining with the engineering mechanical parameters obtained from the geotechnical test of rock mass,the correlation between the engineering mechanical parameters of rock mass and the geophysical response characteristics is constructed,and the geophysical exploration data and the numerical simulation of slope stability are organically combined to provide accurate geological data for the stability evaluation of unstable slope.4.Based on the monitoring data of Synthetic Aperture Monitoring and Early Warning System,the landslide disaster can be identified and warned in early stage.On the basis of geophysical exploration,the discrete element method is used to construct the numerical analysis model of slope,so as to analyze the evolution process and evolution mechanism of slope instability.According to the rigid body limit equilibrium method,the stability of the slope is evaluated and the reasons of slope instability are analyzed.The comparison results show that the stability evaluation results of the numerical model based on the data of geophysical exploration are more real and accurate.Through the research of this paper,we can play the role of Geophysics in slope stability evaluation,improve the accuracy of evaluation and monitoring,and provide a new technical method for slope disaster early warning. |
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