Role of stress,slenderness and foliation on large anisotropic deformations at deep underground excavations  

作　　者：Bo Hu Mostafa Sharifzadeh Xiating Feng Wenbin Guo Roo Talebi 

机构地区：[1]State Key Laboratory of Mountain Bridge and Tunnel Engineering,School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China [2]Northern Star Resources Ltd.,Kalgoorlie,WA 6430,Australia [3]Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang 110819,China [4]Engineering Research Centre for the Safe Exploitation and Comprehensive Utilization of Mineral Resources at Universities of Inner Mongolia,Hulunbuir University,Hulunbuir 021008,China [5]Western Australian School of Mines(WASM),Curtin University,Kalgoorlie,WA 6430,Australia

出　　处：《International Journal of Mining Science and Technology》2021年第4期577-590,共14页矿业科学技术学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.51839003;41801053),the Science and Technology Research Project of Chongqing Education Commission(KJQN201800724);the Natural Science Foundation of Chongqing(No.CSTC2019JCYJ-MSXMX0835),the Fund(Nos.SKLFSE201903 and SKLBT-19-003);the China Postdoctoral Science Foundation(No.2020M683710XB);the Key Scientific Research Project of Inner Mongolia Universities(No.NJZZ20300).

摘　　要：High stress concentrations around underground excavations can result in significant damage to deep hard-rock mines.These conditions can be the result of stopping activities,blasting,seismicity,or other mining activities.Large anisotropic deformation and excavation closure,especially under high-stress conditions,are expected if the excavation is located in a foliated or thin-bedded rock mass.In this research,the behaviour of excavations under deep and high-stress conditions was investigated and categorised.The main purpose was to enhance the existing knowledge of managing large anisotropic deformations and to help prepare suitable measures for handling such contingencies.Numerical simulations using the distinct element method(DEM)and model calibration were performed to reproduce the anisotropic deformation of an ore drive based on the collected field data.Then,the roles of key factors(i.e.stress ratio,slenderness ratio,foliation orientation,and foliation considering excavation orientation)on the large deformation and damage depth of the excavations were investigated.This study found that increasing both the stress ratio and slenderness ratio induced linear increases in wall closure and damage depth,whereas increasing the foliation angle first increases the deformation and damage depth and then reduces them both before and after 45.The wall closure and damage thickness decreased with increasing orientation intercept.The deformation and damage levels were classified based on these factors.

关 键 词：Large anisotropic deformation Buckling Deep mining Slenderness ratio Intercept angle Foliation orientation 

分 类 号：TD31[矿业工程—矿井建设]