Application Research Of Integrated Geophysical Exploration In Geological Disaster Exploration

Because China's vast territory,geological conditions are complex and diverse,different natural factors and human factors can lead to different geological disasters.Geological disasters cause loss of human life safety and property safety,and cause damage to the geological environment.Therefore,a detailed investigation of geological disasters through geophysical exploration methods can identify the size and distribution characteristics of disasters and provide a reliable basis for the management of later disasters.At present,there are many effective geophysical exploration methods that can be used for the investigation of geological disasters.Different geophysical methods are based on different theoretical principles.Currently,the methods for exploration of geological hazards are high-density resistivity and geology.Radar method,seismic exploration method,audio magnetotelluric method,transient electromagnetic method,radioactive measurement method,gravity method,etc.If a single geophysical method is used to survey underground anomalies,it is easy to cause non-uniqueness of exploration results due to the complexity of geological conditions.Therefore,it is better to use two or more geophysical methods to survey the same geological body.The effect of providing a more reliable basis for the determination of underground anomalies.The main content of this paper is the application research of high-density resistivity method,transient electromagnetic method and ground penetrating radar method in the exploration of geological disasters.Firstly,the high-density resistivity method,the transient electromagnetic method,the theoretical principle of the ground penetrating radar method,the different device characteristics and the advantages and disadvantages of the working method are analyzed and compared.The theoretical application of the underground space exploration is proposed.The integrated geophysical methods provide a theoretical basis for practical work.Through the forward modeling technology research of high-density resistivity method,the forward-analysis technology of high-and low-resistance block anomalies is studied by using the Winner device which is widely used in practical work.Different arrangements are for different electricity.The difference in the effect of the anomalous body on the forward view resistivity profile,summarizing the exploration methods applicable to different shallow targets.One-dimensional forward modeling of transient electromagnetic method,due to the attenuation of the secondary field and the size of the resistivity,the resistivity is large,the secondary field decays fast,and the response curve of the low-resistance layer is attenuated for the underground uniform layered medium.The degree is obviously lower than that of the high-resistance layer.When entering the high-resistance layer through the low-resistance layer,the degree of attenuation will increase significantly,indicating that the transient electromagnetic method is more sensitive to low resistance than the high-resistance body,and The information in the deep underground reflects well.Through simulation,the reflection effect on the underground deep water filling area is good.Simultaneously simulating different excitation currents and the parameters of the device will also produce different response characteristics,which has practical guiding significance for the work.According to the content of this paper,the forward exploration of ground penetrating radar is carried out on the empty space filled with different media.The electromagnetic wave propagation can obtain the exact position of the top and bottom interface of the high-resistance anomaly,but due to the absorption and attenuation of water by electromagnetic waves.For accurate water filling holes,accurate position information cannot be obtained.The high-density resistivity method has obvious reflection on the shallow low-resistance anomaly,which can accurately reflect the position and depth information of the low-resistance body;the transient electromagnetic method is sensitive to the deep low-resistance anomaly,and the ground penetrating radar reflects the shallow high-impedance anomaly.Accurate,combined with the above several geophysical methods for underground space exploration,can understand the shallow to deep structural features of the target area in detail,using a variety of methods to overcome the anomalous multiplicity,combined with the detection results of various methods can more accurately describe The depth,scale,and resistivity characteristics of the underground space provide accurate location information for the management of later disasters.