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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (3): 363-371.doi: 10.11872/j.issn.1005-2518.2020.03.166

• Mining Technology and Mine Management • Previous Articles     Next Articles

Investigation on Factors Affecting Slope Instability in Open-pit Mines Based on Geophysical Prospecting Technology

Ensheng KANG1,2(),Haidong MENG1(),Zihao ZHAO2,Tao HE2   

  1. 1.Mining Institute,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia, China
    2.School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongo-lia, China
  • Received:2019-10-07 Revised:2020-02-12 Online:2020-06-30 Published:2020-07-01
  • Contact: Haidong MENG E-mail:25407924@qq.com;haidongm@imust.cn

Abstract:

Weak structural plane is an important factor of slope instability in open-pit mines.It is very important to detect the position of weak structural plane accurately and carry out prediction and early warning in time for the production of open-pit mines.The existence of broken rock,mud or groundwater in the fault of mine slope is the main reason for the formation of weak structural plane,which is obviously different from the complete rock mass in terms of physical properties such as apparent resistivity and dielectric constant.In order to find out the influence of engineering geological conditions and meteorological and hydrological conditions on the formation of the weak structural surface,locate the position of the weak structural surface accurately,and analyze the role of the weak structural surface in the process of slope instability,the detection and research on the influencing factors of the slope instability of the open pit mine were carried out with the Bayan Obo iron mine slope as the research object.Because of the factors such as the high and steep slope formed by mining and the deformed slope body,it is difficult to arrange the high-density electrical method on site.The comprehensive geophysical exploration technology of high-density electrical method and ground penetrating radar(GPR) method were used to survey the slope in the study area,and the survey results were explained.Three high-density survey lines,eight high-density electrical sections and two geological radar survey lines were arranged outside the boundary line of the northern boundary of the study area.The results of high-density electrical method show that the apparent resistivity of intact dolomite and slate in the study area is high,while that of broken slate,fault and water bearing slate is obviously decreased.According to the results of GPR,the whole rock mass has strong reflected energy,and the broken slate and fault are reflected shadow area.The comprehensive geophysical exploration method starts from the different physical properties of the slope rock mass to detect the geological structure of the slope.In this study,the high-density electrical method and the ground penetrating radar survey method make use of the development degree of the slope cracks,the difference of the physical properties and the resistivity of the surrounding rock to carry out the fracture distribution survey.At the same time,using the characteristics of good water conductivity and strong electromagnetic wave absorption to carry out the underground water survey,and verify the inversion results with each other,and combine the drilling data and the engineering hydrogeological data to carry out the slope survey in the study area.It can effectively improve the positioning accuracy of the weak surface.

Key words: geophysical prospecting, high density electrical method, ground penetrating radar, open-pit mine, slope failure, weak structural plane

CLC Number: 

  • P631.3

Fig.1

Winner arrangement and cross-section scanning diagram"

Fig.2

Schematic diagram of reflection detection"

Fig.3

Layout diagram of survey lines in the study area"

Fig.4

Highdensity resistivity inversion map of NL1 line"

Fig.5

Distribution diagram of water area of NL1 line"

Fig.6

Geophysical interpretation results of NL1 line"

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