Metal Mine Tunnel Earthquake (TSP) Prospecting Test

In the tunnel prospecting of metal mines,the exploration accuracy of electrical method,magnetic method and electromagnetic method is affected by complex geological structure and electromagnetic interference.With the simplification of construction technology and the gradual reduction of data processing cost,seismic exploration can be fully utilized in the tunnel prospecting of metal mines because of its advantages of large detection depth,strong signal penetration and high resolution.In this paper,TSP technology based on seismic wave reflection wave method is selected to predict ore prospecting in metal mine tunnels.The principle of reflection wave exploration and the feasibility of TSP system layout in tunnel are analyzed and studied.Through the improved data acquisition method and software data processing,the rock mechanics parameters,reflection horizon and three-dimensional velocity rendering anomalies of the inner mass of metal mine tunnels are obtained,and the location and spatial distribution of stratum interface,fault joint zone and ore body are predicted.Through the experimental study of tunnel seismic prospecting in Yangla copper mine and Yinmin copper mine,the following understandings are obtained :(1)Tunnel seismic is based on the principle of reflection wave method.It is expounded that the elastic properties and physical and mechanical parameters of rock are important interpretation marks for prospecting prediction.The geometric principle and kinematics principle of reflection wave method provide theoretical basis for finding out the spatial location of geological structure and geological anomaly,the TSP interpretation mark of metal mine is established.(2)In view of the complex geological conditions of the mine tunnel,a threedimensional tunnel,chamber and goaf model is established to eliminate the effect on the strength of the seismic wave field.The accurate acquisition method of seismic data is proposed.The data processing steps such as band-pass filtering parameters,first arrival picking and inverse Q filtering are adjusted and optimized.The measures to improve the accuracy of tunnel seismic detection are discussed,the limitations of TSP technology in horizontal formation detection are clarified.(3)Based on the interpretation and prediction of rock and ore mechanical parameters and local wave velocity anomalies,the metallogenic site of antimony ore body in the middle section of 3150 in Yangla copper mine is inferred and extended to the northeast direction controlled by Fj17 fault structure,and the ore-bearing surrounding rock is marble.The skarn-type copper ore bodies are layered and stratoid anomalies distributed in the Fj13 fault in the northeast-southwest direction.It is also the contact site between the skarnized,hornfelsed quartz sandstone and sandy slate of the first member of the Linong Formation and the carbonated marble of the second member of the Linong Formation,and the position and shape of the intrusive rock body granodiorite are inferred.It is inferred that the output of the rare mine-type copper ore body in the Yinmin copper mine is closely related to the transverse fracture of the NEESWW direction.The ore-bearing surrounding rock is the iron slate of the Yinmin Formation.According to the transverse fracture and the wave velocity anomaly of the ore body,it is speculated that the two high-speed anomaly and low-speed anomaly alternation areas are the favorable parts for copper prospecting and exploration in the Yinmin deposit.