Technical Papers

The role of rock mass heterogeneity and buckling mechanisms in excavation performance in foliated ground at Westwood Mine, Quebec

Operations at Westwood mine in Quebec, Canada were temporarily halted in May 2015 after three large-magnitude seismic events occurred over two days. The mechanisms leading to these events, which caused severe damage to several accesses, were not well understood at first. This paper presents the key aspects of FLAC3D小说区 图片区 自偷自拍另类 back-analysis modelling, which include (1) an anisotropic rock mass strength model with properties derived from field and laboratory strength testing, and (2) a scheme to account implicitly for the deconfinement that accompanies buckling around excavations.

Formulation and Application of a Constitutive Model for Multijointed Material to Rock Mass Engineering

This paper presents the formulation of a constitutive model to simulate the behavior of foliated rock mass. The 3D elastoplastic constitutive model, called Comba, accounts for the presence of arbitrary orientations of weakness in a nonisotropic elastoplastic matrix.

PFC (Particle Flow Code): Rock Cutting Excerpt

Historical development and engineering applications using PFC2D and PFC3D.

Numerical Models as Important Component of EGS Design and Operation

Calibration of geomechanics models using microseismic data is key to creating reliable predictive tools. This presentation reviews the geomechanical model used for: stress characterization, microseismic modeling to assess the risk associated with faults activation and induced seismicity, and evaluation of designs and operational strategies. Both hydraulic fracturing and hydro-shearing of discrete fracture network were important components of stimulation of EGS and zonal isolation can play a key role in effective stimulation of an EGS along the entire length of the horizontal well.

FLAC3D Soil-structure Model of a Building

A FLAC3D model of a raft foundation, multi-story building was used to assess the possibility of eliminating piles or jet-grouting columns from its initial design in favor of a thicker foundation. This would provide considerable savings in terms of costs, time, and site management.

Using MINEDWto simulate pore pressure as input for FLAC3Dand 3DEC

It has become common practice to create a three-dimensional (3-D) geomechanical model for the analysis of rock stability.

Packer Testing Program Design and Management

Hydraulic testing using wireline deployed water-inflated packers is becoming a common practice for groundwater characterization at mining sites.

Numerical Evaluation of Effectiveness of Drainwells in Dewatering Overburden at Surface Coal Mines

Typical sedimentary sequences overlying coal seams consist of interbedded sandstones, siltstones, shales, and rider coal seams.

The Economic Challenges of Dewatering at the Victor Diamond Mine in Northern Ontario, Canada

The challenges of mining economically have never been greater than under current global financial conditions.

Use of a Finite Element Code to Model Complex Mine Water Problems

Numerical models are now used routinely to predict ground-water inflows to both surface and underground mines and to help design dewatering systems.

Simulation of Three-Dimensional Pore-Pressure Distribution for Slope-Stability Analysis

A 3D groundwater flow model was constructed using MINEDW [1] to simulate pore pressure at the Chuquicamata open pit mine slope in Chile.

Use of a Chemical Transport Code for the Prediction of Gold Heap Leach Production

Itasca Denver, Inc., (Itasca) in conjunction with Newmont Mining Corporation (NMC) developed a numerical model to estimate gold (Au) production from NMC’s heap-leach operations.

Neutral mine drainage water-quality impacts from a form taconite mine

Surface waters at the site of a former Minnesota taconite mine were reported to have solute concentrations elevated with respect to water-quality standards.

A Calibrated Predictive Geochemical Model of Leaching and Attenuation Reactions in a Mine Pit Lake

A geochemical model was developed to predict future water quality of the Cove pit lake in support of site closure and regulatory permitting.

The nexus between groundwater modeling, pit lake chemogenesis and ecological risk from arsenic in the Getchell Main Pit, Nevada, U.S.A.

小说区 图片区 自偷自拍另类The proliferation of mine pits that intersect the groundwater table has engendered interest in environmental consequences of the lakes that form after cessation of dewatering.

Depressurising an Underground Ore Body at the McArthur River Mine in Northern Saskatchewan, Canada

小说区 图片区 自偷自拍另类Pre-mining depressurising of a deep ore body at the McArthur River mine in northern Saskatchewan was considered to decrease the risk associated with mining near 5 MPa water pressure and increasing the amount of ore that can be extracted.

Mine Dewatering in a Compartmentalized Hydrogeologic Setting at Sishen Mine in South Africa

小说区 图片区 自偷自拍另类Sishen mine in South Africa is one of the largest open-pit iron mines in the world.

A Strategic Rock Mechanics Study for The Kevitsa Open Pit Mine

The Boliden Kevitsa open pit mine is revising its strategic plan with a new pit optimization project undertaken to investigate an increase in production.

Numerical modelling and seismicity at the Kiirunavaara Mine

小说区 图片区 自偷自拍另类What’s happening at the Kiirunavaara Mine?

Regional-scale numerical stress model of the Stockholm area

Analyze the initial stress state in the central and southern areas of Stockholm for the Metro to Nacka and Southern Stockholm.

Deep Sublevel Cave Mining and Surface Influence

With increasing depth, higher stress and more difficult mining. With increasing depth is there more ground surface effects or less?

Tunneldrivning i heterogena förhållanden

InledningProblem: Brist på erfarenhet av tunneldrivning i heterogena förhållanden med konventionell uttagsteknik (borrning och sprängning).

小说区 图片区 自偷自拍另类Mål: Fördjupa kunskapen och förståelse av brott och deformationsmönster vid dessa förhållanden.

Tunnelling and reinforcement in heterogeneous ground – A case study

Abstract

A case study of tunnelling in heterogeneous ground conditions has been analysed. The case involves a tunnel excavated in mixed-face conditions, where the main host material was rock, but for a distance of about 30 m, the tunnel had to be driven through a thick layer of soil, primarily moraine and sandy soil materials.During tunnel drifting, a "chimney" cave developed through the soil layer, resulting in a surface sinkhole.This case was analysed using a three-dimensional numerical model with the FLAC3D software code, in which the soil stratigraphy and tunnel advance were modelled in detail. Tunnel and soil reinforcement in the form of jet grouting of the soil, pipe umbrella arch system, bolting, and shotcreting, was explicitly simulated in the model. The studyaimed at comparing model results with observations and measurements of ground behaviour, and to replicate the major deformation pattern observed. The modelling work was based on a previous generic study in which various factors influencing tunnel and ground surface deformations were analysed for different cases of heterogeneous ground conditions.Model calibration was performed through adjusting the soil shear strength. The calibration provided a qualitatively good agreement with observed behaviour. Calculated deformations on the ground surface were in line with measured deformations, and the location of the tunnel collapse predicted by the model. The installed tunnel reinforcement proved to be critical to match with observed behaviour. Without installed pipe umbrella arch system, calculated deformations were overestimated, and exclusion of jet grouting caused collapse of the tunnel. These findings prove that, in particular, jet grouting of the soil layer was necessary for the successful tunnel advance through the soil layer.

Application of InSAR for Monitoring Deformations at the Kiirunavaara Mine

Assess the use InSAR technology for LKAB's purposes - as a replacement and/or complement to current GPS measurements.

Three-dimensional Modeling and Stress Calibration for a Complex Mining Geometry

Study stress situation for potential continued mining towards greater depths; stress calibration against stress measurements using numerical modeling; and use of calibrated model to study stresses at existing infrastructure, study stresses at potential future haulage level locations, and as input to local models.

Input to Orepass Design — A Numerical Modeling Study

Orepass design guidelines required for potentially continued mining at depth. Rock strength and stress state were validated through comparison with observed fallouts in orepasses and shafts and the optimal orientation and location of orepasses for future mining were determined.

Caving in the Fabian Orebody —from Mining Stope to Cave Crater in Malmberget

The Fabian orebody is a non-daylighting iron orebody in the LKAB Malmberget Mine in northern Sweden. During 2010, a prognosis of the cave development in the Fabian area was developed, based on compilation and analysis of all available material. In March 2012, a new cave crater formed on the ground surface above the Fabian orebody, similar to what was predicted. The prognosis is compared with observations of the caving and the differences and implications quantified. A program for continued monitoring of mining-induced deformation in Malmberget is also described and a criterion for allowable mining-induced surface deformations is proposed.

FLAC3D mesh and zone quality

Mesh quality is crucial for the stability, accuracy, and fast convergence of numerical simulations. However, given the geometrical complexity of some models and the tools available for mesh creation, it is often necessary to accept meshes that deviate significantly from the known ideal shape.

Numerical modeling of rock blasting: Validation tests for Blo-Up 2.5

As part of the Hybrid Stress Blast Model (HSBM) project, Itasca has developed software to model the rock blasting process.

Latest News
  • Web licenses are now available! They are ideal for organizations with many users at different locations and/or for cloud computing....
    Read More
  • Itasca Symposium 2020 Proceedings Download the 2020 Itasca Symposium proceedings and presentations for free....
    Read More
  • Learn More About the Policies We're Updating We’re making updates to our End-User License Agreement, Website Terms of Use, and Privacy Policy....
    Read More

Upcoming Events
15 Jul
Concreep 11+ International Conference - CANCELED
Since 1956, the CONCREEP conference series has remained the key meeting for physicists, mechanicians, and engineers to present and deba... Read More
20 Jul
URTeC 2020
URTeC 2020 in Austin looks to push the boundaries and continue as the premier event focused on the latest science and technology applie... Read More
4 Aug
Deep Foundations Institute S3: Slopes, Slides and Stabilization
Technical Committees of Deep Foundations Institute (DFI) are combining their industry expertise to organize this 2.5-day conference on ... Read More
秒速赛车【gd1133.com光大彩票】-新闻 秒速赛车【gd1100.com光大彩票】-法治 秒速赛车【gd1144.com光大彩票】-案件 秒速赛车【gd1155.com光大彩票】-检察 秒速赛车【gd1166.com光大彩票】-理论 秒速赛车【gd1177.com光大彩票】-新媒体 秒速赛车【gd9900.com光大彩票】-视频 秒速赛车【gd9911.com光大彩票】-评论 秒速赛车【gd9922.com光大彩票】-文化 秒速赛车【gd9933.com光大彩票】-人物 秒速赛车【gd9944.com光大彩票】-舆情 秒速赛车【gd9955.com光大彩票】-装备 小说区 图片区 自偷自拍另类 秒速赛车【gd9977.com光大彩票】-今日推荐 秒速赛车【gd1133.com光大彩票】-图片聚焦 秒速赛车【gd1100.com光大彩票】-以案说法 秒速赛车【gd1144.com光大彩票】-检察视界 秒速赛车【gd1155.com光大彩票】-城东区 秒速赛车【gd1166.com光大彩票】-城中区 秒速赛车【gd1177.com光大彩票】-城西区 秒速赛车【gd9900.com光大彩票】-城北区 秒速赛车【gd9911.com光大彩票】-大通县 秒速赛车【gd9922.com光大彩票】-湟中县 秒速赛车【gd9933.com光大彩票】-湟源县 秒速赛车【gd9944.com光大彩票】-经济技术开发区 秒速赛车【gd9955.com光大彩票】-城南新区 秒速赛车【gd9977.com光大彩票】-高新技术开发区 秒速赛车【gd1133.com光大彩票】-海湖新区 秒速赛车【gd1100.com光大彩票】-小说区 图片区 自偷自拍另类 秒速赛车【gd1144.com光大彩票】-滚动 秒速赛车【gd1155.com光大彩票】-国内 秒速赛车【gd1166.com光大彩票】-国际 秒速赛车【gd1177.com光大彩票】-军事 秒速赛车【gd9900.com光大彩票】-社会 秒速赛车【gd9911.com光大彩票】-财经 秒速赛车【gd9922.com光大彩票】-产经 秒速赛车【gd9933.com光大彩票】-房产 秒速赛车【gd9944.com光大彩票】-金融 秒速赛车【gd9955.com光大彩票】-证券 秒速赛车【gd9977.com光大彩票】-汽车 秒速赛车【gd1133.com光大彩票】-IT 秒速赛车【gd1100.com光大彩票】-能源 秒速赛车【gd1144.com光大彩票】-港澳 秒速赛车【gd1155.com光大彩票】-台湾 秒速赛车【gd1166.com光大彩票】-华人 秒速赛车【gd1177.com光大彩票】-侨网 秒速赛车【gd9900.com光大彩票】-经纬 秒速赛车【gd9911.com光大彩票】-English 秒速赛车【gd9922.com光大彩票】-图片 秒速赛车【gd9933.com光大彩票】-视频 秒速赛车【gd9944.com光大彩票】-直播 北京PK10【gd9955.com光大彩票】-娱乐 PK10开奖【gd9977.com光大彩票】-体育 pk10平台【gd1133.com光大彩票】-文化 Pk10计划【gd1100.com光大彩票】-健康 pk10网址【gd1144.com光大彩票】-生活 pk10开户【gd1155.com光大彩票】-葡萄酒 pk10赛车【gd1166.com光大彩票】-微视界 PK10投注平台【gd1177.com光大彩票】-演出 PK10注册【gd9900.com光大彩票】-专题 PK10开户【gd9911.com光大彩票】-理论 北京PK10【gd9922.com光大彩票】-新媒体 PK10开奖【gd9933.com光大彩票】-供稿 pk10平台【gd9944.com光大彩票】-新闻 Pk10计划【gd9955.com光大彩票】-时事 pk10网址【gd9977.com光大彩票】-视频 pk10开户【gd1133.com光大彩票】-评论 pk10赛车【gd1100.com光大彩票】-股票 PK10投注平台【gd1144.com光大彩票】-区块链 PK10注册【gd1155.com光大彩票】-港股 PK10开户【gd1166.com光大彩票】-科创 北京PK10【gd1177.com光大彩票】-基金 PK10开奖【gd9900.com光大彩票】-私募 pk10平台【gd9911.com光大彩票】-理财 Pk10计划【gd9922.com光大彩票】-信托 pk10网址【gd9933.com光大彩票】-P2P pk10开户【gd9944.com光大彩票】-科技 pk10赛车【gd9955.com光大彩票】-债券 PK10投注平台【gd9977.com光大彩票】-互金 PK10注册【gd1133.com光大彩票】-期货 PK10开户【gd1100.com光大彩票】-原油 北京PK10【gd1144.com光大彩票】-大宗 PK10开奖【gd1155.com光大彩票】-期指 pk10平台【gd1166.com光大彩票】-保险 Pk10计划【gd1177.com光大彩票】-银行 pk10网址【gd9900.com光大彩票】-黄金 pk10开户【gd9911.com光大彩票】-外汇 pk10赛车【gd9922.com光大彩票】-行情 PK10投注平台【gd9933.com光大彩票】-数据 PK10注册【gd9944.com光大彩票】-房产 PK10开户【gd9955.com光大彩票】-汽车 北京PK10【gd9977.com光大彩票】-博客 PK10开奖【gd1133.com光大彩票】-农金 pk10平台【gd1100.com光大彩票】-名家 Pk10计划【gd1144.com光大彩票】-消金 pk10网址【gd1155.com光大彩票】-美股 pk10开户【gd1166.com光大彩票】-创投 pk10赛车【gd1177.com光大彩票】-游戏 PK10投注平台【gd9900.com光大彩票】-滚动 PK10注册【gd9911.com光大彩票】-新浪 PK10开户【gd9922.com光大彩票】-正义网