scholarly journals Collaborative Mining Sequence Optimization for Multiple Stopes under Intensive Mining

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Long Zhang ◽  
Jianhua Hu ◽  
Xinzhong Wang ◽  
Xiuwei Chai ◽  
Lei Zhao
Keyword(s):  
Production Capacity ◽  
Optimal Solution ◽  
Plastic Zone Size ◽  
Mining Area ◽  
Sequence Optimization ◽  
Mining Sequence ◽  
Calculation Results ◽  
Phosphate Mine ◽  
Production Output ◽  
Mining Scheme

The optimization of a mining sequence not only reduces stress concentration in surrounding rock but also prevents underground debris flows, significantly improving safety. Firstly, the 870–898 m level of the eastern mining area in the Tiaoshuihe phosphate mine was divided into 25 ore blocks, and six different mining sequences were designed for this area. Then, it was calculated that five ore blocks must be processed simultaneously to reach the annual production output. The distances between the five simultaneously mined ore blocks will inevitably affect the efficiency of the equipment for any scheme. So, a collaborative model considering both the area stability and production capacity was established by combining the distance between the centers of the five ore blocks as an index. Differences in stability, deformation, and plastic zone size between the schemes are compared. The calculation results show that a mining scheme with a convex stepped shape produces the best results. These results provide a general method for entropy-based mining sequence optimization and an optimal solution for the Tiaoshuihe phosphate mine.

The Characteristics of Collapse Columns in Duanwang Minefield and their Influences on Gas Emission Quantities of Coal Faces

2013 ◽  
Vol 634-638 ◽  
pp. 3537-3540
Author(s):  
Xin Xian Zhai ◽  
Xiao Ju Li ◽  
Yan Wei Zhai
Keyword(s):  
Coal Mine ◽  
Production Capacity ◽  
Mining Area ◽  
Mine Safety ◽  
Shanxi Province ◽  
Free Form ◽  
Karst Collapse ◽  
Coal Face ◽  
Gas Emission ◽  
Mining Depth

Duanwang Coal Mine is located at north of Qinshui coalfield in Shanxi province, China, which gently inclined and thick seams have been mined. Authorized production capacity of the coal mine is 1.8Mt/a. With the increase of mining depth, the mine gas emission quantity increased. Karst collapse columns are very developed in the minefield, and the phenomenon of abnormal gas emission always occurred at the coal face and driving gateway around the collapse columns, then the mine became high gassy one from low gassy mine. Using field measurement and theoretical analysis methods, the following conclusion can be drawn. Karst collapse columns have significant influences on gas emission of the coal face and driving gateway. Here are large amount of free form gas into and around the collapse columns, the collapse columns were disclosure while driving gateway, a large amount of the free gas into collapse column would be instantly released, which caused abnormal gas emission at driving gateway, even leading to gas density exceeding limitation by Coal Mine Safety Regulation of China. However, during mining area of the collapse columns, gas emission quantity at coal face was relatively smaller.

scholarly journals Determining the vehicles routes by considering its different types and capacity (heterogeneous) to minimize the total distribution cost

2018 ◽  
Vol 154 ◽  
pp. 01069
Author(s):  
Nurhidayat ◽  
Annie Purwani
Keyword(s):  
Optimal Solution ◽  
Fixed Cost ◽  
Routing Problem ◽  
Total Cost ◽  
Vehicle Type ◽  
Different Types ◽  
Insertion Algorithm ◽  
Calculation Results ◽  
Distribution Cost ◽  
Alternative Solutions

Packaged sugar is one of the products in sugar cane manufacture, PT Madubaru Yogyakarta. Currently, the company deals with a high distribution cost because there is no plan to determine the vehicle route, vehicle type, and capacity for distributing the product. In this research, the optimum route of the distributing vehicles is developed. The company has three different types and capacity of vehicles: L300, HD, and PS. A problem in determining the distribution route here is called as Vehicle Routing Problem (VRP). The basic form of classic VRP says that all vehicles owned by a company have the same capacity (homogenous), meanwhile not all companies have the vehicles with same capacity. The heterogeneous variant is used to minimize the fixed cost of vehicles and distribution variant cost using Sequential Insertion Algorithm. This research has three purposes; are minimizing the number of vehicles used (NV), Total time of Completion tour (TCT) and Distribution Total Cost (TCD). The results based on a test calculation of a shipment date (August 19, 2016) of the company show three alternative solutions to distribute the packaged sugar to 12 consumers. The third alternative solution is the optimal solution and chosen as the decision result of the packaged sugar shipment. Based on the calculation results, it is needed 2 vehicles type HD with capacity 7,000 kg and type PS with capacity 3,500 kg, with total time of completion tour (TCT) is 828.49 minutes or 13.81 hours, and distribution total cost is IDR. 959,011.

Stability Analysis of Tunnel Surrounding Rock Based on Coupled Fluid-Solid Theory

2011 ◽  
Vol 90-93 ◽  
pp. 1900-1903
Author(s):  
Fu Ming Wang ◽  
Xiao Long Li ◽  
Yan Hui Zhong ◽  
Xiao Guang Chen
Keyword(s):  
Stability Analysis ◽  
Plastic Zone ◽  
Coupling Effect ◽  
Plastic Zone Size ◽  
Wall Rock ◽  
Surrounding Rock ◽  
Maximum Deformation ◽  
Calculation Results ◽  
The Stability ◽  
Tunnel Depth

Taking Chaijiazhuang Tunnel of Lingnan Expressway as project background, the stability analysis of surrounding rock was performed based on the coupled fluid-solid theory. The distributions of stress field, displacement field and plastic zone of rock mass after excavation of tunnel were discussed considering coupled effect between flow and stress under the condition of different rock level and tunnel depth. Compared with the calculation results of not considering coupling effect, the maximum deformation, maximum principle stress and plastic zone size of wall rock were obviously increased when considering coupling effect, which showed a remarkable influence of coupled fluid-solid effect on the stability of tunnel surrounding rock. Some conclusions were drawn and may provide some guidance to the design and construction of tunnels in water-rich strata.

Scheme Selection of Coal Mining under Villages

2014 ◽  
Vol 955-959 ◽  
pp. 1962-1967
Author(s):  
Jiao Li ◽  
Tang Kai Qu ◽  
Shu Jing Chen ◽  
Lan Zheng ◽  
Jian Zhou
Keyword(s):  
Local Government ◽  
Coal Mining ◽  
Mining Area ◽  
Actual Situation ◽  
Mine Area ◽  
The World ◽  
Mining Methods ◽  
Mining Scheme ◽  
Scheme Selection ◽  
Selection Of

Coking coal of the Shanxi Lvliang mining area, enjoying a fame as the treasure of China, is one of the scarcest types in the world. A mining area in Lvliang willow mining area. Heavy coal under villages has affected the production of the mine. In order to maximize the benefits of local government, residents and enterprise, we analyzed several typical coal under villages mining methods, took account of the actual situation of this area and conducted evaluations on these mining plans of A mine area. Taking into consideration of all factors, Removal plan of villages above mining area was considered to be the most ideal mining scheme.

Reactive Power Optimization in Distribution Network with PV Station Based on Intelligence Algorithm

2013 ◽  
Vol 753-755 ◽  
pp. 2429-2432
Author(s):  
Xin Wei Ren ◽  
Jian Zheng Xu
Keyword(s):  
Power Loss ◽  
Reactive Power ◽  
Optimal Solution ◽  
Active Power ◽  
Reactive Power Optimization ◽  
Pv System ◽  
Voltage Level ◽  
Bacterial Colony ◽  
Calculation Results ◽  
Power Problem

Reactive power problem of PV station in distribution power system is discussed. Probability theory is introduced to calculate the expectation of active power, which is approximately used to replace the randomly changing output. Reactive output can be adjusted by changing some related parameters of the grid-connected PV system. Considering reactive power of PV station as control variables, a model with voltage level constraints of minimizing the active power loss is established and its optimal solution is figured out with IBCC (Improved Bacterial Colony Chemotaxis). Case calculation results show the validity of above-mentioned model and algorithm.

Analysis of Platform on Piles Application on Deformation Control of Underground Pipe in Reclamation Areas

2014 ◽  
Vol 580-583 ◽  
pp. 344-348 ◽  
Author(s):  
Dong Ni Zhou ◽  
Qin Shang ◽  
Bi Xiao
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Optimal Solution ◽  
Underground Pipeline ◽  
Deformation Control ◽  
Underground Pipe ◽  
Specification Method ◽  
Design Program ◽  
Coastal Beach ◽  
Calculation Results

At coastal beach soft soil area, reclamation projects may have great effect on the deformation of the existing underground pipeline. In this paper, the engineering specification method and the finite element method are used respectively for the pipe deformation calculation of the application of platform on piles to handle such underground pipeline deformation control. The results show that the application of platform on piles can effectively diminish the settlement deformation of the existing underground pipe. Co mparing the two calculation results and the monitoring results, the finite element calculation results are more in line with the actual. By appropriately increasing the width of the platform and the pile spacing, the initial design program can achieve a more optimal solution.

scholarly journals Modeling of the Production Capacity of the Enterprise in the Conditions of Combined Production Flows of Metallurgical Production

2019 ◽  
Vol 6 (12) ◽  
Author(s):  
Olena Vol. Stepanova
Keyword(s):  
Mathematical Model ◽  
Production Capacity ◽  
Maximum Flow ◽  
Formal Representation ◽  
Network Graph ◽  
Cross Sectional ◽  
Metallurgical Production ◽  
Blast Furnace Production ◽  
Production Output

Today there is no complex solution to the problem of calculation and optimization of production capacity, taking into account the performance of the main aggregates and the throughput of equipment of auxiliary sections in the combined production streams of metallurgical production. There is no method for finding bottlenecks in combined production streams. There is no classification of bottlenecks. The purpose of the article is to develop scientific and methodological recommendations for optimizing the enterprise (subdivision) in terms of combined production streams. Achieving the goal requires solving the following tasks: analysis of theoretical foundations and methods of calculation of production capacity; development of a formal representation of the structure of combined production streams; choice of mathematical model for optimization of production capacity. Analysis of studies and publications shows the impossibility of solving the problem of optimizing the production capacity of an enterprise without combining the formal representation of the structure of production streams with the corresponding mathematical model. It is proposed to submit the structure of combined production streams in the form of a graph-mathematical model. A network graph of combined production streams of blast furnace production was constructed. To calculate and optimize the production capacity, the problem of the maximum flow in the network, which is the task of linear programming, is used. The problem of finding the maximum flow in the grid, that is, the maximum production output of the unit to take into account the performance of the main aggregates and the capacity of the service stations, is solved. The maximum flow in the grid means the optimal value of the production capacity. Solving the dual problem of maximum flow gives the possibility of finding a minimum cut in a network, which is analogous to the bottleneck in the combined production flows. The following classification of bottlenecks in combined production streams is proposed: local, nodular, cross-sectional. The proposed methods of research and solving the formulated problems generalize and develop the well-known theoretical principles of the economy and the organization of production.

scholarly journals Analysis of plastic zones in surrounding rocks around a circular tunnel considering the effect of intermediate principal stress and heterogeneity

2019 ◽  
Vol 275 ◽  
pp. 03007 ◽  
Author(s):  
Shuxin Deng ◽  
Yonglai Zheng ◽  
Lipo Feng ◽  
Le Van Tuan ◽  
Cuizhou Yue ◽  
...  
Keyword(s):  
Plastic Zone ◽  
Principal Stress ◽  
Lateral Pressure ◽  
Pressure Coefficient ◽  
Plastic Zone Size ◽  
Intermediate Principal Stress ◽  
Circular Tunnel ◽  
Lateral Pressure Coefficient ◽  
Calculation Results ◽  
Coulomb Criterion

Based on a modified Mohr-Coulomb criterion with a non-uniform coefficient, a calculation method of plastic zone boundary of surrounding rocks in a circular tunnel in non-uniform stress field is established. Both the effects of intermediate principal stress and heterogeneity are studied. With the increase of the intermediate principal stress, the plastic zone size of the surrounding rocks will decrease first and then increase. Lateral pressure coefficient has an effect on the shape of the plastic zone. With the increase of lateral pressure coefficient, the plastic zone gradually becomes uniform, and the failure of surrounding rock develops upward and downward from both sides. As non-uniform coefficient increases, the material is more uniform and the effect of intermediate principal stress on the plastic zone is less significant. If the effect of intermediate principal stress is not taken into account, the calculation results tend to be consistent with results calculated by the Mohr-Coulomb criterion, which are considered to be conservative.

scholarly journals New Concept of Combined Microwave Delay Lines for Noise Radar-Based Remote Sensors

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4842
Author(s):  
Szczepaniak ◽  
Susek
Keyword(s):  
Phase Shifter ◽  
Delay Line ◽  
Vital Signs ◽  
Optimal Solution ◽  
Delay Lines ◽  
Noise Radar ◽  
Digitally Controlled ◽  
Calculation Results ◽  
The Time Domain ◽  
Microwave Techniques

Delay lines with a tunable length are used in a number of applications in the field of microwave techniques. The digitally-controlled analogue wideband delay line is particularly useful in noise radar applications as a precise detector of movement. In order to perform coherent reception in the noise radar, a delay line with a variable delay value is required. To address this issue, this paper comprises a new concept of a digitally-controlled delay line with a set of fine distance gates. In the paper, a solution for micro-movement detection is proposed, which is based on direct signal processing in the time domain with the use of a microwave analogue correlator. This concept assumes the use of a microwave analogue tapped delay line structure. It was found that the optimal solution for a noise radar with an analogue signal correlator is a combined delay line consisting of switched reference sections, a tapped delay line, and a precision phase shifter. The combined delay line presented in this paper is dedicated to serving as the adjustable reference delay for a noise radar intended for the detection of micro-movement. The paper contains the calculation results and delay line implementation for a given example. The new structure of the analogue tapped delay line with the calculation of optimal parameters is also presented. The precise detector of movement can be successfully used for the remote sensing of human vital signs (especially through-the-wall), e.g., breathing and heart beating, with the simultaneous determination of position.

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