scholarly journals Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Long Zhang ◽  
Jian-hua Hu ◽  
Xue-liang Wang ◽  
Lei Zhao
Keyword(s):  
Structural Parameters ◽  
Probability Model ◽  
Strip Width ◽  
Strip Mining ◽  
Equipment Operation ◽  
Drilling Equipment ◽  
Ore Bodies ◽  
Geological Conditions ◽  
Phosphate Mine ◽  
Stability Graph

Strip mining with subsequent filling is one of the main mining methods for gently inclined thin ore bodies. The production process of excavating alternate strips is beneficial to the safety of mining. Reasonable stope structural parameters are key to achieving safe and efficient mining. The Tiaoshuihe phosphate mine of Sanning Mining is taken as an example in this study. Based on precision finite element modeling and simulation, a reasonable width range and the interval value of the strip are determined. A reliable and efficient strip width is calculated by using the probability model of the improved Mathews stability graph method. The results show the following. Firstly, under the geological conditions and backfill environment of the Tiaoshuihe phosphate mine, the reasonable and safe strip width interval is 7–9 m. Secondly, the probabilities of open stope stability with strip widths of 7, 8, and 9 m are 88.55%, 86.76%, and 84.94%, respectively. The reasonable probabilities of stope stability with strip widths of 7 and 8 m are higher than 85%. Thirdly, combining this with the drilling equipment operation parameters, it is suggested that the best strip width is 7 m without increasing the strength of the backfill.

scholarly journals Multiobjective Optimization Design for Structural Parameters of TBM Disc Cutter Rings Based on FAHP and SAMPGA

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Laikuang Lin ◽  
Yimin Xia ◽  
Dun Wu
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Structural Parameters ◽  
Rock Breaking ◽  
Ring Structure ◽  
Structure Design ◽  
Disc Cutter ◽  
Load Bearing ◽  
Geological Conditions ◽  
Weight Coefficients

As a key component of tunnel boring machines (TBMs), the disc cutter ring and its structural parameters are closely related to the TBM tunneling quality. Literature review shows that investigations on optimization design methods for cutter ring structure are seriously insufficient. Therefore, in this paper, a multiobjective optimization design model of structural parameters for disc cutter rings is developed based on the complex geological conditions and the corresponding cutter ring structure design requirements. The rock breaking capability, energy consumption, load-bearing capability, wear life, and wear uniformity of disc cutter are selected as the objectives, and the geometric structure of cutter rings, ultimate load-bearing capability, and cutterhead drive performance are determined as constraints. According to the characteristics of this model, a self-adaptive multipopulation genetic algorithm (SAMPGA) is utilized to solve the optimization problem, and the Fuzzy analytical hierarchy process (FAHP) is employed to calculate weight coefficients for multiple objectives. Finally, the applicability of the proposed method is demonstrated through a case study in a TBM project. The results indicated that the rock breaking performance and service life of the disc cutter are improved after optimization by using the proposed method. The utilization of SAMPGA effectively solves the premature local convergence problems during optimization. The geological adaptability should be considered in the cutter ring structure design, which can be realized by using the proposed method based on the suitable weight coefficients.

scholarly journals Increasing of filtration characteristics of ore bodies in borehole uranium mining

2020 ◽  
Vol 168 ◽  
pp. 00014
Author(s):  
Bayan Rakishev ◽  
Zhiger Kenzhetayev ◽  
Asel Shampikova ◽  
Bakytzhan Toktaruly
Keyword(s):  
Experimental Work ◽  
Uranium Mining ◽  
Optimal Parameters ◽  
Chemical Reagents ◽  
Chemical Type ◽  
Ore Bodies ◽  
Geological Conditions ◽  
Before And After ◽  
Degree Of Extraction ◽  
Borehole Mining

There is a description of technology by borehole uranium mining in Kazakhstan. The factors which affect for reduction of filtration characteristics in productive reservoirs are studied in detail and described an effective method for increasing borehole uranium production. The processes that occur during borehole mining of uranium with the use of sulfuric acid as solvent, as well as the conditions and reasons for reducing the productivity of geotechnical wells during their operation are considered. The results of experimental work on the intensification of borehole uranium mining in complex mining and geological conditions are analyzed and discussed, comparative graphs of the content of uranium in the productive solution, the flow rate of wells, the degree of extraction and the volume of production before and after the experiments are constructed. The results of experimental work on the efficiency of borehole uranium production, the content of uranium in PS and the productivity of wells, with predominance of the chemical type of sedimentation, are positively evaluated. The optimal parameters for the intensification of borehole uranium production in complex mining and geological conditions are recommended, and method for using complex of multi-purpose chemical reagents in combination with traditional methods of well regeneration is developed.

scholarly journals GEODETIC SUBSTANTIATION OF THE SARYARKA COPPER ORE REGION

2020 ◽  
Vol 6 (444) ◽  
pp. 194-202
Author(s):  
M. Nurpeissova ◽  
◽  
M. Zh. Bitimbayev ◽  
К. В. Rysbekov ◽  
K. Derbisov ◽  
...  
Keyword(s):  
Survey Methods ◽  
Mining Industry ◽  
Geodetic Network ◽  
Mineral Resources ◽  
Geodetic Survey ◽  
Copper Ore ◽  
Seismic Surveys ◽  
Ore Bodies ◽  
Geological Conditions ◽  
Tectonic Features

. Information about copper deposits of Kazakhstan, development of which is carried out in the Saryarka region and its role in the development of the mining industry are considered in the article. Geological, structural and tectonic features of the deposits are presented. Research results on improvement methods of studying and geomechanical processes management in the development of mineral resources are presented. It is shown that the problem of geomechanical processes management can be solved on the basis of methodology for rock condition geomonitoring considered in this article, which provides comprehensive accounting and analysis of all natural and technogenic factors, as well as use of control tools developed by the authors. The article presents technical solutions to ensure operational safety during the development of Saryarka region field reserves, which occur in difficult mining and geological conditions. Ore bodies of the deposit have different sizes and are located at different depths, therefore, seismic surveys are carried out. The geodetic network of provisional seismic surveys at the field has been substantiated. It is proposed to conduct surveys using modern geodetic instruments, such as satellite technologies, electronic, digital geodetic instruments. The geodetic survey methods proposed by the authors provide information on the bowels of the earth with a high degree of accuracy.

Application of Geophysical Exploration Results in Prospecting Prediction at Xiayingfang Silver Polymetallic Deposit in Chengde, Hebei Province

2013 ◽  
Vol 405-408 ◽  
pp. 607-610
Author(s):  
Chun Zhong Ni ◽  
Dong Wang
Keyword(s):  
North China ◽  
Mining Area ◽  
North China Platform ◽  
Northern Margin ◽  
Ore Bodies ◽  
Metallogenic Belt ◽  
Geological Conditions ◽  
Group A ◽  
Fault Belt ◽  
Prospecting Prediction

Xiayingfang mining area in the structure of the earth is part of north China platform of Inner Mongolia axis and yanshan fold belt, which belong to the northern margin of north China platform polymetallic metallogenic belt. Give priority to with silver polymetallic minerals, in the area are mainly distributed at Xiayingfang - Dongshan fault belt and its two side. Ore bodies occur mainly in group a bar at the bottom of the Tuanshanzi group banded dolomite and dolomitic limestone. After analyzing the characteristics of geophysical prospecting in the area, combined with the study of geological conditions, it is good for further prospecting.

Prediction and Discuss of Strap Mining Subsidence by Numerical Simulation Analysis and its Engineering Apply

2011 ◽  
Vol 308-310 ◽  
pp. 1683-1687
Author(s):  
Fei Hong Xie ◽  
Zhi Yong Kou ◽  
Yong Mou Zhang
Keyword(s):  
Visual Analysis ◽  
Simulation Analysis ◽  
Mining Area ◽  
Accurate Estimate ◽  
Calculation Model ◽  
Mining Subsidence ◽  
Strip Mining ◽  
Geological Conditions ◽  
Calculation System ◽  
Analysis System

In this paper, In order to reasonably determine the mining width and reserves length of strip mining, reliable simulation subsidence due to strip mining under earth，according to the cavity environment of the engineering measure, the protected object's space position and the mining rock strata's circumstance, and the relevant mining subsidence mechanic, calculation model are chosen in order to predicting the designing mining area transform and data sorting after mining. Its function and perform is put into practice for all various aspects of subsidence calculation in visual analysis system of own developed software package. It is applicable to all mining geological conditions and mining methods. Based on the condition of strip and pillar practice of Matigou colliery of Huating Mining Group, It is also applicable to this calculation system to guide successfully mining under river and architectural complex, the accurate estimate forecast had been attained.

scholarly journals Hydrogeological processes and phenomena and assessment of their danger

2021 ◽  
Vol 937 (3) ◽  
pp. 032018
Author(s):  
D Moiseev ◽  
L Gorina ◽  
V Romanovsky ◽  
K Valeeva ◽  
O Gorbunova
Keyword(s):  
Physical State ◽  
Negative Impact ◽  
Climatic Factors ◽  
Structural Parameters ◽  
Natural Processes ◽  
Geological Conditions ◽  
Complex Engineering ◽  
Hazard Level ◽  
The Stability ◽  
Negative Factors

Abstract In modern complex engineering-geological conditions of cities, the growth and scale of development of dangerous natural processes and phenomena can be traced. In many ways, the reasons for this are not only technogenic load on the soil, but also changes in climatic factors. Buildings and objects exposed to hazardous factors of hydrogeological processes are becoming increasingly vulnerable to their impact, which can lead to catastrophic consequences. One of the main conditions for increasing the stability of objects is the adaptation of existing methods or approaches to assessing natural hazards that have a negative impact on the physical state of such objects. The authors of the article propose an adaptation of the international INFORM approach in order to assess the hazard level of natural processes and phenomena in built-up areas. The task is also to develop a methodology for assessing the physical state of objects exposed to such processes and phenomena. To solve this problem, the study examines the practical aspects of applying the principles of the Weber-Fechner law in determining the state of the structural parameters of buildings that are under the influence of negative factors of hazardous natural processes and phenomena. The study is based on the principle of changing the category of the physical state of objects from changes in the level of exposure to hazardous factors of natural processes and phenomena.

scholarly journals Analysis of Mechanical Parameters and Creep Characteristics of Surrounding Rock in Fully Weathered Sandstone Tunnel

2019 ◽  
Vol 136 ◽  
pp. 04022
Author(s):  
Kaicheng Hua ◽  
hongyan Guo ◽  
Ke Li ◽  
Xiang Yang Cui
Keyword(s):  
Structural Parameters ◽  
Friction Angle ◽  
Surrounding Rock ◽  
Mountainous Area ◽  
Mechanical Parameters ◽  
Creep Characteristics ◽  
Geological Conditions ◽  
Triaxial Creep ◽  
Deformation Test ◽  
Triaxial Creep Test

Based on the geological conditions of the fully weathered sandstone stratum in the expressway of the mountainous area, the Huizhou-Qingyuan section of the Yuzhan Expressway is used to analyze the mechanical parameters and creep characteristics of the surrounding rock of the tunnel through the indoor model test. It is concluded that: 1) The uniaxial compression deformation test measured the structural parameters of the fully weathered sandstone stratum structure, and obtained that the elastic modulus and internal friction angle φ of the fully weathered sandstone was 14.20°, and the cohesion c was 0.343Mpa. 2) The failure mode of fully weathered sandstone specimens was obtained by triaxial creep test. The creep curves of different weathered loads were analyzed and the Xiyuan rheological model was established. 3) The creep data was analyzed by MATLAB software, and the surrounding rock parameters under different surrounding rock were obtained.

KOZENY–CARMAN CONSTANT FOR GAS FLOW THROUGH FIBROUS POROUS MEDIA BY FRACTAL-MONTE CARLO SIMULATIONS

Fractals ◽  
2019 ◽  
Vol 27 (04) ◽  
pp. 1950062 ◽  
Author(s):  
BOQI XIAO ◽  
XIAN ZHANG ◽  
GUOPING JIANG ◽  
GONGBO LONG ◽  
WEI WANG ◽  
...  
Keyword(s):  
Porous Media ◽  
Monte Carlo ◽  
Fractal Dimension ◽  
Monte Carlo Simulations ◽  
Pore Size ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Probability Model ◽  
Monte Carlo Technique ◽  
Fibrous Porous Media

In this paper, the Kozeny–Carman constant of fibrous porous media is simulated by the Fractal-Monte Carlo technique. The proposed probability model of the Kozeny–Carman constant is obtained based on the fractal distribution of pore size in fibrous porous media, and thus can be expressed as a function of structural parameters of fibrous porous media, including porosity, micro-pore size, fiber diameter, tortuosity fractal dimension and area fractal dimension of pores. Our results demonstrate that the Kozeny–Carman constant of fibrous porous media increases with increases in tortuosity fractal dimension and fiber diameter. Our results also illustrate a satisfying agreement of the Fractal Monte-Carlo simulations obtained by the proposed model and the existing experimental data. Therefore, the proposed Fractal-Monte Carlo technique can be used to characterize other transport properties of fluid in fibrous porous media.

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