Effect of Underground Mine Blast Vibrations on Overlaying Open Pit Slopes: A Case Study for Daye Iron Mine in China

Investigating the propagation and attenuation of blast vibration in rock slopes is the key point to assess the influence of underground mine blasting on overlaying open pit slopes stability and determining the potential risk. In this paper, Daye Iron Mine in China has been chosen as the case to study the effect of blast vibrations on overlaying open pit slopes due to underground mine blast. Firstly, the characteristics of blast loadings are analyzed by the dynamic finite element method. Then, a three dimensional (3D) numerical model of the open pit and the underground mine is made, which is verified by the field monitoring data to prove its reliability. The effect of blast vibration on overlaying open pit slope due to underground mine blasting are discussed based on the peak particle velocity (PPV) and the peak effective tensile stress (PETS) distribution characteristics which are calculated and analyzed by inputting the obtained blast vibration data into the numerical model. The results show that the effect of present mining blasting on the stability of pit slopes are limited because the simulated maximum PPV and PETS of monitoring point on slopes are all < 0.747 cm/s and 0.738 MPa. At last, according to numerical simulations of the underground mine blasting, the PPV predicting formulas for the slopes in Daye Open Pit Iron Mine is proposed based on the classic Sadaovsk formula.

[1]  Italo Onederra,et al.  Modelling the size of the crushed zone around a blasthole , 2003 .

[2]  Jiang Na,et al.  Altitude effect of blasting vibration velocity in rock slopes , 2014 .

[3]  Dingbang Zhang,et al.  Rock Mass Deformation Characteristics in High-Steep Slopes Influenced by Open-Pit to Underground Mining , 2016, Geotechnical and Geological Engineering.

[4]  Yih-Hsing Pao,et al.  Elastic Waves in Solids , 1983 .

[5]  Deepankar Choudhury,et al.  Stability Analysis of Soil Slope Subjected to Blast Induced Vibrations Using FLAC 3D , 2013 .

[6]  M. Iphar,et al.  Prediction of ground vibrations resulting from the blasting operations in an open-pit mine by adaptive neuro-fuzzy inference system , 2008 .

[7]  M. P. Roy,et al.  Blast design and vibration control at an underground metal mine for the safety of surface structures , 2016 .

[8]  ChenMing,et al.  New method for dynamic stability analysis of rock slope under blasting vibration based on equivalent acceleration and Sarma method , 2014 .

[9]  Li Dong-qing Effect of blasting vibration frequency on slope stability , 2012 .

[10]  Yong-Bok Jung,et al.  Case study of establishing a safe blasting criterion for the pit slopes of an open-pit coal mine , 2013 .

[11]  Jian Zhao,et al.  Udec simulation for dynamic response of a rock slope subject to explosions , 2004 .

[12]  Yu Chong RESEARCH ON DYNAMIC RESPONSE OF PRESTRESSED ANCHORCABLES SUBJECTED TO BLASTING LOAD ON SLOPE , 2007 .

[13]  Nan Jiang,et al.  Blasting vibration safety criterion for a tunnel liner structure , 2012 .

[14]  Xing Xu,et al.  Effect of Excavation Blasting in an Under-Cross Tunnel on Airport Runway , 2015, Geotechnical and Geological Engineering.

[15]  Yu De-yun Study on Simulation of Discontinuous Deformation Analysis for Slope Stability Under Blast Impact , 2010 .

[16]  H. Mansouri,et al.  Coupling of two methods, waveform superposition and numerical, to model blast vibration effect on slope stability in jointed rock masses , 2014 .

[17]  Chuanbo Zhou,et al.  Vibration Safety Criteria for Surficial Rock Mass of Open Pit Slope Affected by Underground Mining Blasting Operations , 2017 .

[18]  Peng Yan,et al.  Spectral prediction and control of blast vibrations during the excavation of high dam abutment slopes with millisecond-delay blasting , 2017 .