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Study of the Rock Mass Failure Process and Mechanisms During the Transformation from Open-Pit to Underground Mining Based on Microseismic Monitoring

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Abstract

To quantitatively understand the failure process and failure mechanism of a rock mass during the transformation from open-pit mining to underground mining, the Shirengou Iron Mine was selected as an engineering project case study. The study area was determined using the rock mass basic quality classification method and the kinematic analysis method. Based on the analysis of the variations in apparent stress and apparent volume over time, the rock mass failure process was analyzed. According to the recent research on the temporal and spatial change of microseismic events in location, energy, apparent stress, and displacement, the migration characteristics of rock mass damage were studied. A hybrid moment tensor inversion method was used to determine the rock mass fracture source mechanisms, the fracture orientations, and fracture scales. The fracture area can be divided into three zones: Zone A, Zone B, and Zone C. A statistical analysis of the orientation information of the fracture planes orientations was carried out, and four dominant fracture planes were obtained. Finally, the slip tendency analysis method was employed, and the unstable fracture planes were obtained. The results show: (1) The microseismic monitoring and hybrid moment tensor analysis can effectively analyze the failure process and failure mechanism of rock mass, (2) during the transformation from open-pit to underground mining, the failure type of rock mass is mainly shear failure and the tensile failure is mostly concentrated in the roof of goafs, and (3) the rock mass of the pit bottom and the upper of goaf No. 18 have the possibility of further damage.

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Abbreviations

v p,s :

P- or S-wave velocity in the rock mass

t e :

Time error

R i :

Distance between the sensor and the location point

E p,s :

Radiated seismic energy of the P- or S-wave

E :

Total seismic energy

\(t_{\text{s}}\) :

Duration

\(\dot{u}_{\text{corr}}^{2} (t)\) :

Radiation pattern corrected far-field velocity pulse squared

\(\sigma_{\text{A}}\) :

Apparent stress

P :

Seismic potency

\(\bar{D}\) :

Average displacement on fault plane

\(V_{\text{A}}\) :

Apparent volume

\(\mu\) :

Shear modulus of rock mass

U :

Matrix of displacements

G :

Green’s function

M :

Moment tensor

\({\mathbf{M}}_{\text{ISO}}\) :

Isotropic component of the moment tensor

\({\mathbf{M}}_{\text{DC}}\) :

Pure double-couple component of the moment tensor

\({\mathbf{M}}_{\text{CLVD}}\) :

Compensated linear vector dipole component of the moment tensor

M 1, M 2, M 3 :

Eigenvalues of the moment tensor

\(P_{\text{DC}}\) :

Proportion of \({\mathbf{M}}_{\text{DC}}\)

\({\vec{\mathbf{e}}}_{1}\), \({\vec{\mathbf{e}}}_{2}\), \({\vec{\mathbf{e}}}_{3}\) :

Eigenvectors of the moment tensor

u :

Displacement on the motion direction of the fracture plane

S :

Surface area of fracture plane

\({\vec{\mathbf{n}}}\) :

Normal direction of the fracture plane

\({\vec{\mathbf{v}}}\) :

Motion direction of the fracture plane

\(K_{\text{c}}\) :

A constant relating to a source model

f c :

Corner frequency

\(\tau\) :

Shear stress

\(\sigma_{\text{n}}\) :

Normal stress

\(\mu_{\text{s}}\) :

Coefficient of static friction

\(\sigma_{1}\), \(\sigma_{2}\), \(\sigma_{3}\) :

Maximum, medium, and minimum principal stress

l, m, n :

Cosines of the normal direction of the fracture plane

\(\sigma_{\text{v}}\) :

Vertical stress

\(\sigma_{\text{h,max}}\), \(\sigma_{\text{h,min}}\) :

Maximum and minimum horizontal stress

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFC0801602), the National Natural Science Foundation of China (51574059, 51574060, and 51604062) and the China Scholarship Council (201706080101). We would like to thank Dr. Grzegorz Kwiatek of GFZ Potsdam for his guidance and support on HybridMT program. We thank anonymous reviewers for constructive comments that helped improve this manuscript.

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Zhao, Y., Yang, T., Bohnhoff, M. et al. Study of the Rock Mass Failure Process and Mechanisms During the Transformation from Open-Pit to Underground Mining Based on Microseismic Monitoring. Rock Mech Rock Eng 51, 1473–1493 (2018). https://doi.org/10.1007/s00603-018-1413-5

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