GROUP WINNING BLASTING AS A ROCKBURST CONTROL METHOD � CASE STUDY FROM A POLISH COPPER MINES

2011 ◽  
Author(s):  
Piotr Mertuszka
Keyword(s):  
Control Method ◽  
Copper Mines

scholarly journals Zoning Control Technology of Gob-Side Roadway Driving with Small Coal Pillar Facing Mining in a Special Isolated Island Working Face: A Case Study

2021 ◽  
Vol 11 (22) ◽  
pp. 10744
Author(s):  
Changliang Han ◽  
Houqiang Yang ◽  
Nong Zhang ◽  
Rijian Deng ◽  
Yuxin Guo
Keyword(s):  
Control Method ◽  
Coal Pillar ◽  
Control Technology ◽  
Stability Zone ◽  
Pressure Relief ◽  
Collaborative Control ◽  
Working Face ◽  
Underground Coal Mines ◽  
Engineering Practices

The gob-side roadway in an isolated island working face is a typical representative of a strong mining roadway, which seriously restricts the efficient and safe production of underground coal mines. With the engineering background of the main transportation roadway 1513 (MTR 1513) of the Xinyi Coal Mine, this paper introduces the engineering case of gob-side roadway driving with small coal-pillar facing mining in an isolated island working face under the alternate mining of wide and narrow working faces. Through comprehensive research methods, we studied zoning disturbance deformation characteristics and stress evolution law of gob-side roadway driving under face mining. Based on the characteristics of zoning disturbance, MTR 1513 is divided into three zones, which are the heading face mining zone, the mining influenced zone, and the mining stability zone. A collaborative control technology using pressure relief and anchoring is proposed, and the differentiated control method is formed for the three zones. For the heading face mining zone, the control method of anchoring first and then pressure relief is adopted; for the mining influenced zone, the control idea of synchronous coordination of pressure relief and anchorage is adopted; for the mining stability zone, the control method of anchoring without pressure relief is adopted. Engineering practices show that the disturbance influence distance of working face 1511 on MTR 1513 changes from 110 m advanced to 175 m delay. At this time, the surrounding rock deformation is effectively controlled, which verified the rationality of the division and the feasibility of three zoning control technology. The research results can provide reference for gob-side roadway driving with small coal pillar facing mining in a special isolated island working face.

scholarly journals Social democratic representation and welfare spending: a quantitative case study

2019 ◽  
Vol 8 (3) ◽  
pp. 589-596
Author(s):  
Henning Finseraas
Keyword(s):  
Welfare State ◽  
Democratic Party ◽  
Control Method ◽  
Social Democratic Party ◽  
Synthetic Control ◽  
Welfare Spending ◽  
Social Democratic ◽  
Voter Preferences ◽  
Quantitative Case Study

AbstractThe welfare state literature argues that Social Democratic party representation is of key importance for welfare state outcomes. However, few papers are able to separate the influence of parties from voter preferences, which implies that the partisan effects will be overstated. I study a natural experiment to identify a partisan effect. In 1995, the Labour Party (Ap) in the Norwegian municipality of Flå filed their candidate list too late and could not participate in the local election. Ap was the largest party in Flå in the entire post-World War period, but have not regained this position. I use the synthetic control method to study the effects on welfare spending priorities. I find small and insignificant partisan effects.

scholarly journals Deformation Characteristics and Control Method of Kilometer-Depth Roadways in a Nickel Mine: A Case Study

2020 ◽  
Vol 10 (11) ◽  
pp. 3937
Author(s):  
Guang Li ◽  
Fengshan Ma ◽  
Jie Guo ◽  
Haijun Zhao
Keyword(s):  
Rock Mass ◽  
Failure Modes ◽  
Control Method ◽  
Steel Tube ◽  
In Situ Monitoring ◽  
Zonal Disintegration ◽  
Deformation Characteristics ◽  
Geological Conditions ◽  
Ground Stress

Deformation failure and support methods of roadways have always been critical issues in mining production and safety, especially for roadways buried in complex engineering geological conditions. To resolve these support issues of kilometer-depth roadways under high ground stress and broken rock mass, a case study on the roadways in the No. 2 mining area of Jinchuan Mine, China, is presented in this paper. Based on a detailed field survey, the deformation characteristics of the roadways and failure modes of supporting structures were investigated. It was found that the horizontal deformations were serious, and the primary support was not able to control the surrounding rock well. Additionally, a broken rock zone test was carried out, which indicated that a zonal disintegration phenomenon occurred around the roadways and the maximum depth of the fractured zone was more than 4.8 m. In order to effectively limit the deformation in the roadways, a new support scheme called the “multistage anchorage + concrete-filled steel tube” was put forward. To further assess the support behavior of the new method, we selected a test roadway in the research area, and numerical simulations and in-situ monitoring were conducted. The findings suggest that the roadway’s serious deformation under high ground stress and broken rock mass could be successfully controlled by the new control method, which can provide a reference for other engineering solutions under similar geological conditions.

scholarly journals Development of a Pull Production Control Method for ETO Companies and Simulation for the Metallurgical Industry

2019 ◽  
Vol 10 (1) ◽  
pp. 274 ◽  
Author(s):  
Javier Gejo García ◽  
Sergio Gallego-García ◽  
Manuel García-García
Keyword(s):  
Production Control ◽  
Control Method ◽  
Metallurgical Industry ◽  
Lead Times ◽  
Customer Requirements ◽  
Planning And Control ◽  
Engineer To Order ◽  
The Moment ◽  
And Control

At the moment, many engineer-to-order manufacturers are under pressure, the overcapacity in many sectors erodes prices and many companies, especially in Europe have gone into recent years in bankruptcy. Due to the increasing competition as well as the new customer requirements, the internal processes of an ETO company play an essential role in order to achieve a unique selling proposition (USP). Therefore this paper exposes how the production planning and control of an engineer-to-order manufacturer can be designed in order to increase its OTD (order-to-delivery) rate as well as decrease the WIP (work-in-progress) and the production lead times. To prove the optimized planning logic, it was applied in a simulation case study and based on the results; the conclusions about its potential are derived.

Virtual Maintenance Process Modeling and Simulation

2010 ◽  
Vol 44-47 ◽  
pp. 527-531 ◽  
Author(s):  
Dong Zhou ◽  
Mei Hui Wang ◽  
Lin Huo ◽  
Chuan Lv
Keyword(s):  
Modeling And Simulation ◽  
Control Method ◽  
Model And Simulation ◽  
Scheduling Method ◽  
A New Technique ◽  
Conflict Strategies ◽  
Virtual Maintenance ◽  
Maintenance Model ◽  
Maintenance Process

Virtual maintenance technique brings new mode for system maintainability design and analysis, however, the theory of virtual maintenance is not fully studied and researches are deficiency in the key field of virtual maintenance modeling and simulation. So virtual maintenance model and simulation control method are studied in the paper. Virtual maintenance model is based on Petri Net and can describe the relations of maintenance resources, and the model structure, formal definition, maintenance object, resource state and model operation are given. In addition, virtual maintenance simulation rules and simulation scheduling method are built in the paper. Simulation scheduling objective, flow and conflict features of maintenance process simulation are analyzed, and conflict strategies are addressed subsequently. Finally, a case study of the LRU repair of an aircraft is conducted, and the result confirms the validation and feasibility of all the studies, which can become a new technique means for maintainability engineering.

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