The Research And Application Of The Integrated Geophysical Exploration Method In The Safety Evaluation Of Tailing Pond Dam

Mineral resource is an vital part of the resources that are needed for modern social development. Mine production safety is an important guarantee of the exploitation and utilization of mineral resources. The facilities in Tailing pond is an significant component of the mine production facilities, the safety of dam is not only related to the mineral exploitation, in case of disasters such as dam collapsion, it will pose a great threat to the living of the lower reaches residents and ecological environment. In recent years, the earthquakes take place frequently in China. In order to ensure the safety of the tailings pond, it is very essential to study the influence of the earthquake on the stability of tailings dam as well as the geological structure of the surrounding mountains.There are three main methods to survey hidden dangers of dam safety and unfavorable geological structure of the mountain: artificial trace, engineering drilling and geophysical exploration. Geophysical exploration, compared with the former two methods, is faster,cheaper and more effective. In recent years, with the development of engineering geophysical, technology and exploration accuracy. Geophysical exploration is widely used in various engineering geological problems. However, the geophysical method alone has multi-explanations. In actual engineering exploration, the best solution is to use a variety of methods to certify each other, so as to ensure the accuracy of exploration. The reaserch objects of this thesis are the post-earthquake dam and its surrounding mountains of Majiatian tailings pond in Panzhihua city with an aim to find out the regional geological conditions. Four geophysical methods has been adopted for the application and research of comprehensive geophysical exploration, namely, shallow seismic reflection wave method, the high density resistivity method, the high accuracy gravity exploration, radon measuring.This thesis expounds the basic theory and characteristics of 4 kinds of geophysical exploration methods, and conduct forward study of numerical modeling of seismic wave,High-density Resistivity and gravity anomalies field by the finite difference method, the two-dimensional finite element method and the polygonal cross-section method. First puts forward wave equation and difference scheme of the elastic and acoustic wave, the variational formula of resistivity imaging and the polygonal section formula of the uniform gravity anomalous body of two dimensions. What’s more, it has established 4 kinds of geological models with the background of the actual geological conditions. They are undulating bedrock model, the filling underground cavity model the filling Fault fracture zone model and the weak terrane model. Summarizing the abnormal performance of these four kinds of geologic bodies in three kinds of geophysical exploration methods through forward study of four models. Discussing respective advantages and disadvantages of four geologic bodies in the shallow seismic reflection wave method and the high density resistivity method and the high accuracy gravity exploration. Thus, it provides a reference for further exploration, data inversion and results interpretation. Finally, on the basis of above research, fully collecting relevant data and conducting comprehensive geophysical prospecting of the tailings dam and its surrounding mountains, finding out whether there is a hazard and whether there is a unfavorable geological structure in surrounding mountains that will pose a threat to safety.Research shows that the application of four kinds of geophysical methods which are adopted in the dam safety evaluation is good, 4 methods testify and complement each other. The results of forward modeling provide a high reference value for the final inversion and interpretation of exploration. The exploration figures out the geological condition of tailing pond dam and its surrounding mountains. The results are validated by the related geological and drilling data and provide a geological reference for the safety evaluation and subsequent maintenance of the tailing dam. at the same time, it provides a reference and application experience for the use of integrated geophysical prospecting in other tailing dam safety evaluation.