Research On Application Of Multi-physical Information Fusion In Survey Of Complex Geological Structure

In recent years,with the rapid development of computer technology,new information technology has been gradually applied in many fields of civil engineering such as investigation,design and construction.The application of information technology has greatly improved the ability of data transmission,processing and visualization in engineering,and the development of information technologies such as BIM and GIS has promoted the informatization process of civil engineering.In civil engineering,geological structures are usually changeable and complex.Investigation methods such as surveying,mapping,drilling and geophysical exploration provide information from different perspectives.Therefore,it is important to study on new information technology to analysis these multiphysical information synthetically.On the one hand,the time of data acquisition is too long and the inversion is difficult for of 3D high-density resistivity method,so new acquisition and inversion methods are studied to solve the problem of complex geological structure investigation.On the other hand,multiphysical information fusion method is proposed for the data-processing of information from different survey methods.Based on the information of mapping and drilling,geophysical exploration methods are used to obtain multi-physical information,and information fusion methods are used to evaluate and analysis the data and images.Firstly,the types and characteristics of some common complex geological structures are analyzed.The information and related physical quantities obtained by geological structure survey methods are analyzed,as well as the depth of detection,accuracy and efficiency of various survey methods.It is difficult for the 2D high-density resistivity method to reflect the spatial distribution of the 3D geological structures,so the data acquisition and inversion research of the 3D high-density resistivity method is carried out.The information fusion method is researched for the multi-physical information acquired in the exploration.Data are evaluated in terms of scale,accuracy,and reliability,and information fusion algorithms are used for data and image fusion,which greatly improves the accuracy of exploration.Finally,based on the investigation project of the underground caverns in Xiqiancun,Shouning,Fujian Province,the 3D high-density resistivity method and multi-physical information fusion method are applied to the survey of underground caverns in the goaf.GPS is used to obtain the location of entrance of caverns and terrain points.The 3D laser scanning are used to obtain the spatial distribution of the caverns,and the 2D and 3D high-density resistivity methods are used to evaluate the resistivity distribution of the underground space.Then the space of the underground goaf is obtained through information fusion.The results show that the 3D high-density resistivity method eliminates part of the interference information and reduces the results.Through information fusion,the distribution of the underground caverns of the whole area can be evaluated based on the information of the local area,and the continuity and trend of the cavern can be easily judged.