Influence law of multipoint vibration load on slope stability in Xiaolongtan open pit mine in Yunnan, China

The purpose of this work was to explore the influence law of vibration load on rock mass structure and slope stability. Based on the type and transmission way of vibration stress wave, the main stress in the horizontal and vertical directions was analyzed and the superposition effect of the stress wave was revealed. After the mechanical analysis of the sliding mass, the calculation formulas of the anti-sliding force and the sliding force were derived and the damage mechanism of blasting vibration to the structural plane was defined. In addition, according to the structure and lithologic parameter of the slope as well as the vibration monitoring data, the west slope stability of Xiaolongtan open pit mine was analyzed. The results show that the time-dependent stability factor is proportional to the vibration speed and the peak values appear at the same time. Vibration load promotes the breakage of the structural plane leading to the drop of the west slope stability factor by 0.23%. Under the multipoint simultaneous blasting, the fluctuating laws of the stability factors are consistent. The more the start-up points are, the higher the weakening degree to the slope stability is. Under the multipoint allochronic blasting, the stability factor depends on the synthetic waveform structure of all vibration waves. The greater the blasting time difference is, the lower the weakening degree to the slope stability is. Selecting the reasonable quantity of start-up points and time difference could fully reduce the adverse influence of vibration load to slope stability.

[1]  Jiasheng Zhang,et al.  Application of matrix-based system reliability method in complex slopes , 2013 .

[2]  J. Malet,et al.  Techniques, advances, problems and issues in numerical modelling of landslide hazard , 2007, 0709.2642.

[3]  Franco Bagnoli,et al.  Infiltration effects on a two-dimensional molecular dynamics model of landslides , 2012, Natural Hazards.

[4]  Kourosh Shahriar,et al.  3-D numerical modelling of Domino failure of hard rock pillars in Fetr6 Chromite Mine, Iran, and comparison with empirical methods , 2013 .

[5]  Chandra Prakash Poudyal,et al.  Landslide susceptibility maps comparing frequency ratio and artificial neural networks: a case study from the Nepal Himalaya , 2010 .

[6]  M. M. Mohammed,et al.  Assessment of rapid impact compaction in ground improvement from in-situ testing , 2013 .

[7]  Ergün Tuncay,et al.  Causes, mechanism and environmental impacts of instabilities at Himmetoğlu coal mine and possible remedial measures , 2001 .

[8]  Ren Yuelon.  Influence of blasting vibration and structural plane progressive failure on slope stability , 2014 .

[9]  Wei Zhou,et al.  Zonal extraction technology and numerical simulation analysis in open pit coal mine , 2012 .

[10]  Anthony Atkins,et al.  Outburst Risks in Coal Mining Operations and Application of Social Networks in Knowledge Management Systems , 2008 .

[11]  H. Fang,et al.  Stability of Earth Slopes , 1991 .

[12]  Leandro R. Alejano,et al.  Comparison of limit-equilibrium, numerical and physical models of wall slope stability , 2011 .

[13]  Mostafa Sharifzadeh,et al.  A new method for risk assessment of pillar recovery operation , 2010 .

[14]  G. Exadaktylos,et al.  A spatial estimation model for continuous rock mass characterization from the specific energy of a TBM , 2008 .

[15]  Lucia Luzi,et al.  Influence of earthquakes on the stability of slopes , 2007 .

[16]  M. Bednarik,et al.  Landslide susceptibility assessment using the bivariate statistical analysis and the index of entropy in the Sibiciu Basin (Romania) , 2011 .

[17]  Y. Xu,et al.  Field testing of erodibility of two landslide dams triggered by the 12 May Wenchuan earthquake , 2011 .

[18]  I. Alcántara-Ayala.  Geomorphology, natural hazards, vulnerability and prevention of natural disasters in developing countries , 2002 .

[19]  D. N. Whittles,et al.  The Effect of Strain Rate on the Breakage Behaviour of Rock , 2008 .

[20]  Guowei Ma,et al.  Modelling rock fracturing and blast-induced rock mass failure via advanced discretisation within the discontinuous deformation analysis framework , 2011 .

[21]  Jun Yang,et al.  Stability assessment and feature analysis of slope in Nanfen Open Pit Iron Mine , 2012 .

[22]  Hong-Xin Chen,et al.  Mechanisms and runout characteristics of the rainfall-triggered debris flow in Xiaojiagou in Sichuan Province, China , 2012, Natural Hazards.

[23]  W. Yoon,et al.  Kinematic analysis for sliding failure of multi-faced rock slopes , 2002 .

[24]  Peng Hong-ge.  Analysis and Opplicaiton on End-Slope Timeliness of Internal Dumping Under Flat Dipping Ore Body in Large Surface Coal Mine , 2008 .

[25]  G. Exadaktylos,et al.  A Combined Three-Dimensional Geological-Geostatistical-Numerical Model of Underground Excavations in Rock , 2007 .

[26]  E. Hoek,et al.  Rock slope engineering , 1974 .

[27]  G. Exadaktylos,et al.  A specific upscaling theory of rock mass parameters exhibiting spatial variability: Analytical relations and computational scheme , 2008 .

[28]  Jérémy Rohmer,et al.  Dynamic sensitivity analysis of long-running landslide models through basis set expansion and meta-modelling , 2014, Natural Hazards.