检索结果-南通市图书馆

Methods applied in Australian industry to evaluate coal mine slope stability

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2020年第2期30卷 151-155页

作者： Alison McQuillan ismet canbulat Joung Oh School of Minerals and Energy Resources Engineering UNSW SydneyAustralia

Strata failure is a principal hazard in open cut coal mining as it has the potential to cause multiple *** to the excavation of any slope,a geotechnical assessment should review the likely slope performance,including the risk of slope *** to manage this risk to an acceptable level should accompany the geotechnical analysis.A survey of 43 practising geotechnical engineers indicated that kinematic and 2D limit equilibrium analyses were the methods most commonly applied to analyse excavated slope *** these methods are well established and widely applied in the broad rock engineering disciplines(***,hard rock),a recent review of over 60 slope failures suggests these methods have limited suitability for modelling the complex failure mechanisms observed in excavated coal mine *** techniques do not adequately capture the rock mass component of excavated slope failure and do not provide a geospatial location of potential failure,while 2D limit equilibrium techniques do not adequately capture the 3D mechanisms of excavated slope *** which do consider the 3D mechanisms of slope failure are summarized for industry consideration and application.

关键词： Slope stability 2D 3D Open cut coal mine Limit equilibrium

Fundamentals of modern ground control management in Australian underground coal mines

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2020年第5期30卷 573-582页

作者： Jason Emery ismet canbulat Chengguo Zhang School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Underground coal mining is inherently hazardous,with uncontrolled ground failure regarded as one of only several critical risks for multiple fatality ***,implementation and management of overarching systems and procedures for maintaining strata control is an important step to mitigating the impact of ground failure hazards at a mine site operational *** paper summarised the typical pro-active ground control management system(PGCMS)implemented in various Australian underground coal *** produces approximately 100 million tonnes a year of metallurgical and thermal coal from approximately 30 of the world’s safest longwall mines operating in New South Wales and *** increased longwall productivity required to achieve both high levels of safety and profitability,places significant emphasis on the reliability of pro-active ground control management for longwall mining *** depths,adverse geological conditions,elevated variable stress regimes and weaker ground conditions,coupled with an industry wide need for increased development rates continue to make ground control management *** control management is not only about ground support and pillar design though but also a structured process that requires a coordinated effort from all levels of the workforce to both minimise the occurrence of adverse geotechnical events and mitigate the potential risks when they do *** PGCMS presented in this paper is proven to provide both a safer and more productive mine environment through minimisation of unplanned *** critical elements of the method are presented in detail and demonstrate the utility and value of a ground control management system that has potential for implementation in underground coal mining globally.

关键词： Strata control Ground control Management Longwall Safety Risk

New risk assessment methodology for coal mine excavated slopes

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2018年第4期28卷 581-590页

作者： Alison McQuillan ismet canbulat Dan Payne Joung Oh School of Minerals and Energy Resources Engineering UNSW SydneySydney 2052Australia BHP Billiton Coal Level 11480 Queen StBrisbaneQueensland 4000Australia

This paper presents a new risk assessment methodology for coal mine excavated slopes. This new empirical-statistical *** assessment m. ethodology （SSAM! is intended for use by geotechnical engineers at both the design review and operational stages of a mine＇s life to categonse the risk of an excavated coal mine slope. A likelihood of failure is determined using a new slope stability classification system for excavated coal mine slopes developed using a database of 119 intact and failed case studies sourced from open cut coal mines in Australia. Consequence of failure is based on slope height and stand-off distance at the toe of the excavated slope. Results are presented in a new risk matrix, with slope risk being divided into low, medium and high categories. The SSAM is put forward as a new risk assess- ment methodology to assess the potential for, and consequence of, excavated coal mine slope failure. Unlike existing classification systems, assumptions about the likely failure mode or mechanism are not required. Instead, the SSAM applies an approach which compares the conditions present within the exca- vated slope face, with the known past performance of slopes with similar geotechnical and geometrical conditions, to estimate the slope＇s propensity for failure. The SSAM is novel in that it considers the depo- sitional history of strata in an excavated slope and how this sequence affects slope stability. It is further novel in that it does not require explicit measurements of intact rock, rock mass and/or defect strength to rapidly calculate a slope＇s likelihood of failure and overall risk. Ratings can be determined entirely from visual observations of the excavated slope face. The new SSAM is designed to be used in conjunction with existing slope stability assessment tools.

关键词： Risk assessment Slope stability Open cut coal mine Excavated slope Likelihood of failure

A semi-quantitative coal burst risk classification system

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2018年第5期28卷 721-727页

作者： Onur Vardar Chengguo Zhang ismet canbulat Bruce Hebblewhite School of Minerals and Energy Resources Engineering University of New South Wales

Safety is the highest priority in the mining industry as underground mining in particular poses high safety risks to its workers. In underground coal mines, coal bursts are one of the most catastrophic hazards, which involves sudden and violent dynamic coal mass failure with rapid ejection of the broken material into the mine workings. Despite decades of research, the contributing mechanisms of coal bursts are still not completely understood. Hence, it remains challenging to forecast coal bursts and quantify their likelihood of occurrence. However, a range of geological and geotechnical factors are associated with coal bursts and can increase the coal burst proneness. This paper introduces a semi-quantitative coal burst risk classification system, namely, BurstRisk. Based on back-analysis of case histories from Australia, China and the United States, BurstRisk classifies the coal burst risk into three categories:low, medium and high risk. In addition, it allows mining engineers to modify the weighting of the selected factors based on specific conditions. The risk classification charts introduced are for both longwall retreat and development sections of long-wall mining operations. This paper also provides a set of risk management strategies and control measures for effective coal burst mitigation.

关键词： Underground coal mining Coal burst Rockburst Risk management Safety Semi-quantitative

Assessment of energy release mechanisms contributing to coal burst

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2017年第1期27卷 43-47页

作者： Zhang Chengguo canbulat ismet Tahmasebinia Faham Hebblewhite Bruce School of Mining Engineering UNSW Sydney 2052Australia

Coal burst is a dynamic release of energy within the rock （or coal） mass leading to high velocity expulsion of the broken/failed material into mine openings. This phenomenon has been recognised as one of the most catastrophic failures associated with the coal mining industry, which can often lead to injuries and fatalities of miners as well as significant production losses. This paper aims to examine the mecha- nisms contributing to coal burst occurrence, with an emphasis on the energy release concept. In this study, a numerical modelling study has been conducted to evaluate the roles and contributions of differ- ence energy components. The energy analysis presented in this paper can help to improve the under- standing of energy release mechanisms esoeciallv under Australian conditions.

关键词： Coal burstCoal burst mechanismsEnergy releaseNumerical modellingMine geomechanics

Borehole deformation based in situ stress estimation using televiewer data

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2475-2481页

作者： Hamid Roshan Danqi Li ismet canbulat Klaus Regenauer-Lieb School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW2052Australia WA School of Mines MineralsEnergy and Chemical EngineeringCurtin UniversityPerthWA6102Australia

The knowledge of in situ stress is critical in safe and optimised extraction of minerals and energy *** situ stresses are either measured directly(***)or estimated indirectly(*** breakouts).Borehole breakout analysis for in situ stress estimation is considered a relatively simple and cost-efficient *** technique,however,poses certain limitations such as complexities with progressive formation of breakouts and it requires inputs such as rock failure parameters that are not often *** a result,significant effort has been made to develop new indirect methods for in situ stress *** deformation analysis using four-arm caliper has been recently proposed for in situ stress estimation and has shown promising *** this study,we demonstrate a new methodology that analyses the borehole televiewer data with the technique of borehole deformation analysis to estimate the in situ stresses through a field case *** advantages and challenges of using borehole televiewer data for stress estimation based on borehole deformation analysis are discussed and the best practice to obtain the reliable results is *** limitations of using fourarm caliper and borehole deformation analysis for in situ stress estimation are also discussed and it is shown how televiewer data can overcome such ***,the in situ stress results obtained from televiewer data and borehole deformation analysis are compared with independent in situ stress measurements to show the robustness and reliability of the proposed methodology.

关键词： In situ stress Borehole deformation Televiewer Elastic properties Downhole logging

Risk management in open cut coal mines

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2013年第3期23卷 369-374页

作者： ismet canbulat John Hoelle Jason Emery Undergrounds Anglo American Metallurgical Coal Brisbane 4000 Australia Open Cut Geotechnical Engineering Group Anglo American Metallurgical Coal Brisbane 4000 Australia

There are a number of geotechnical systems used at open cut operations of Anglo American's Metallurgical Coal business unit in Australia. These systems are mainly mine site specific, based on geological information and used as hazard plans. They are qualitative and reliant upon the experienced judgement of site based engineers and the general workforce. They are not suitable for calculating the associated risks of geological structures and mining responses. A uniform risk rating system that can be used to provide an unbiased, standard and quantifiable assessment of the risk from highwall and lowwall failures is therefore developed using the experience gained with such systems in Anglo American's South African operations. This system is a semi-quantitative risk rating system and takes into account the relative differences in the importance of hazards as experienced at each mine site as a result of different combinations of geotechnical factors and mining conditions. It is based on critical geotechnical and other parameters that have been identified by site mining engineers, geologists and geotechnical engineers. The primary advantage of this risk rating system is that all open cut mines in the Anglo American's Metallurgical Coal operations use a near identical system, which enables the user to compare the risk after each blast and with other mines. The system can be adjusted to meet local mine specific requirements. The implementation of this system, a computer program that automatically calculates the risks and recommends predetermined controls, has been made as practical and as easy to use as possible. This program can be used by personnel from other mining disciplines not directly related to geotechnical engineering.

关键词： Geotechnical OpenRisk Semi-quantitative Risk management Open cut Ground control

Numerical modelling of strength and energy release characteristics of pillar-scale coal mass

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 935-943页

作者： Onur Vardar Chengguo Zhang ismet canbulat Bruce Hebblewhite School of Minerals and Energy Resources Engineering.University of New South Wales

Coal burst is a manifestation of rapid energy release,which is considered as one of the most critical operational hazards in underground coal *** study numerically investigates the effects of discontinuities on the strength and energy release characteristics of coal mass samples under uniaxial *** universal distinct element code(UDEC)was used to model pillar-scale coal mass samples that were represented by an assembly of triangular deformable blocks,and pre-existing discontinuities such as bedding planes and cleats were also included in the *** shows that cleat spacing can have a significant impact on compressive strength and energy release,with both strength and energy release(magnitude and rate)reducing as the number of cleats was *** work is one of the first attempts to numerically model and quantify the energy release which occurs during the failure of pillar-scale coal mass samples with varying cleat *** insights from the numerical modelling can help to understand the possible energy release mechanisms and associated coal burst potential in changing coal cleat conditions.

关键词： Coal burst Coal clearing Energy release Distinct element method(DEM) Numerical modelling

Numerical and analytical simulation of the structural behaviour of fully grouted cable bolts under impulsive loading

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2018年第5期28卷 807-811页

作者： Faham Tahmasebinia Chengguo Zhang ismet canbulat Onur Vardar Serkan Saydam School of Minerals and Energy Resources Engineering University of New South Wales

Designing reliable yielding support system to mitigate the effect of the kinetic energy in burst-prone conditions in mining and tunneling excavations is one of the challenges for geotechnical engineers. A combination of the support elements can be used to increase rock strength and minimise the displacement of unstable rock mass. It is important to understand how the support system works to ensure the stability of underground excavations. Cable bolts have been commonly used as an effective underground support system and an element of reinforcement to improve rock stability. Cable bolts are usually considered to be subjected to static loads under relatively low stress environments, however, in burst-prone conditions, they might be subjected to dynamic loads. Cable bolts as well as other support elements are used in burst-prone conditions to absorb the kinetic energy of the removed rock to avoid sudden and violent failures. This paper develops numerical and a novel analytical simulation technique for cable bolts to assess their structural behaviour under static and dynamic loading conditions. The numerical and analytical models are then validated against experimental observations reported in the literature, which demonstrates the reliability of the proposed models.

关键词： Cable bolts Yielding support Coal burst Shear dynamic loading