The Experts below are selected from a list of 4077 Experts worldwide ranked by ideXlab platform
Musa Adebayo Idris - One of the best experts on this subject based on the ideXlab platform.
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Probabilistic Stability Analysis of Underground Mine Excavations
2014Co-Authors: Musa Adebayo IdrisAbstract:The creation of underground Mine Excavation disturbs the original state of the rock mass surrounding the Excavation which often leads to instability of the Excavation. This poses a threat to the safety of personnel and equipment in and around such Excavations. Therefore the stability of underground Mine Excavations has always been a major concern to geotechnical engineers. The stability of the Excavations depends on physical and mechanical properties of the rock masses as well as the in situ stress condition. For stability analyses, these parameters are deterMined either by in situ investigations or laboratory tests. Because of the inherent uncertainties associated with natural materials such as rock masses, the precise values of the properties are never known. The sources of these uncertainties could be inherent variability caused by random process (aleatory uncertainty) or it could be a knowledge-based uncertainty (epistemic uncertainty) such as measurement error or model transformation uncertainty. Traditional deterministic methods, which use mean or single characteristics value of the input parameter for stability analyses, do not consider the inherent uncertainties in the rock mass properties hence the underlying effects of the uncertainties become obscure. Depending on the distributive character of these uncertainties, the deterministic methods may lead to results which are not representative of real behaviour. Therefore, for a realistic stability analysis of an underground Excavation the uncertainties must be adequately considered in the analysis using probabilistic methods. With probabilistic methods, the likelihood of occurrence of unsatisfactory performance or failure of the underground Excavation can be estimated with respect to a predefined tolerable limit. Even though probabilistic methods have been increasingly used in slope stability analyses, the application of probabilistic methods has not received considerable attention in the stability analyses of underground Mine Excavations for instance. Therefore, there is need for an increased understanding of the effect of uncertainty in the rock mass properties on the stability of underground Mine Excavations so as to facilitate the application of the probabilistic methods in the stability analysis of the underground Excavation. This thesis is therefore aiming in that direction and thus the objective. To achieve this aim, the uncertainties in rock mass properties were quantified so as to deterMine the statistical parameters and the probability density functions for the random rock mass parameters. Different probabilistic methods, each with different sampling techniques and assumptions, were incorporated with commercial finite difference numerical code to analyse the stability of underground Mine Excavations for different case studies. The probabilistic methods considered were Point Estimate Methods (PEM), Artificial Neural Network (ANN), Response Surface Method (RSM), Monte Carlos Simulation (MCS) and Strength Classification Method (SCM). The results of these analyses were reported in a series of papers which make up this thesis. The methodology, results and conclusions from this thesis will increase the understanding of the effects of uncertainty in rock mass properties and facilitate the application of probabilistic methods to the analyses of underground Excavation stability.
Zhao Xiao-guang - One of the best experts on this subject based on the ideXlab platform.
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Simulation of walking stability of dig-anchor machine
Journal of Engineering Design, 2011Co-Authors: Zhao Xiao-guangAbstract:This paper studies the running deviation and vibration of EBZ160 dig-anchor machine in the climbing process and analyzes various factors affect the stability of the whole machine through establishing mechanical climbing model.Applying RecurDyn,the virtual prototype model of the dig-anchor and the Mine Excavation roadway pavement model were established.The simulation of the dig-anchor machine in the climbing process researched on the forces and torque characteristics of the track tension cylinders and the driving wheels then studies the whole machine velocity,acceleration,and the changes of the elevation angle.The results of the simulation indicate that in the climbing process there exists certain impact in the force on the track key parts.When the climbing angle is the extreme value,vibration of the gravity center will become larger,and the phenomena of running deviation will come up.Through the analysis of simulation results,enlarging the tension cylinder pretension and adding the machine weight to reduce the gravity center's migration can decrease the whole machine running deviation and vibration.
Xu Gang-qian - One of the best experts on this subject based on the ideXlab platform.
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The Mine Excavation Planning Scheme Based on 3D Visualization
Computing Technology and Automation, 2013Co-Authors: Xu Gang-qianAbstract:Excavating plan was complex and difficult.In three-dimensional environment,the spatial distribution and spatial relation of underground Excavation projects will be perspicuous.In addition,three-dimensional geological block model can provide a rapid calculation model for volume and reserves calculation.In this paper.According to the basic characteristics of Mine production and requirement of production plan scheduling,the key technology of visualization plan scheduling has been studied,a visualization of the implementation of the planning scheme has been proposed.
Zhang Bin - One of the best experts on this subject based on the ideXlab platform.
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The Coal Seam Burst Apparent Mechanism and Prevention Measures of Mine Excavation Roadway Nearby Structure of Liang Baosi Mine
Science and Technology Information, 2012Co-Authors: Zhang BinAbstract:Burst tendency of coal rock impact failure is the inherent capability,the superposition of tectonic stress and disturbance stress is the essence of coal burst induced by geologic structures such as faults,folds and transformations;the effective approach to prevent tectonic-controlled coal burst is to avoid the stress superposition.This article combines Excavation roadway seam impact display characteristics of Liangbaosi Mine,analysis of the cause of its formation,then research into the rockburst mechanism,according to the site conditions,taking timely relief measures,played a very good effect.The study of the subject has the reference value to shock hazard assessment,rockburst prevention theory research and scene governance.
Ya Nan Chen - One of the best experts on this subject based on the ideXlab platform.
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Analysis on FLAC Large Deformation Mode of Rock Mass due to Transform from Open-Pit to Underground Mining
Applied Mechanics and Materials, 2013Co-Authors: Lai Shan Chang, Rui Peng Zhang, Ya Nan ChenAbstract:According to the problem of rock slope deformation, fracture and stability during the transform from open-pit to underground mining at Yanqianshan Iron Mine, using FLAC large deformation mode to analysis Mine Excavation characteristics about deformation and damage of open-pit slope in different depth. Excavation simulation displays that the softrock of north slope easily to backfall heavily, But unusually form rapid sliding, the influence to underground mining is small, but large number of small crushed stones fill the rock layer, that is unfavorable to control the dilution and loss index. South slope hardrock mass have not appeared large deformation and unitary sliding during primary mining.