Rock Bolting Numerical Simulation Research and Application of the Face Breakthough

2011 ◽  
Vol 105-107 ◽  
pp. 2239-2243
Author(s):  
You Lin Xu ◽  
Hui Zhang ◽  
Wei Zheng
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Rock Strength ◽  
Test Methods ◽  
Strength Test ◽  
Simulation Research ◽  
Rock Bolting ◽  
Mine Roadway ◽  
The Face ◽  
Coal Rock

This paper analyzes the importance of rock bolting in coal mining, and the difficult of using rock bolting in breakthough with the affect of mining, adopt hydraulic fracturing and coal-rock mass strength test methods to test the seam stress and rock strength. Make the numerical simulation of break though bolting solutions in coal mine roadway by using FLAC3D software, simulate the different distributions of pre-stressed in coal-rock with three situations, the same raw distance but different space, the same space but different raw distance, impose different preload on the roof anchor in the rock bolting of mine roadway breakthough. Then determine a reasonable bolting solution of coal mine roadway according to the case of prestressed in coal-rock.

The Research and Application of FLAC3D in Optimization of Roadway Support

2014 ◽  
Vol 1010-1012 ◽  
pp. 1568-1573
Author(s):  
Hai Feng Du
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Basic Process ◽  
Simulation Research ◽  
Numerical Simulation Result ◽  
Mine Roadway ◽  
Roadway Support

This article describes the basic process of numerical simulation, and an example of Xinyu coal mine roadway numerical simulation research. And the support scheme is proposed by the numerical simulation result.

Study on Numerical Simulation of Secondary Dust Deposition Phenomenon

2013 ◽  
Vol 423-426 ◽  
pp. 2957-2962 ◽  
Author(s):  
Bicao Can Ling ◽  
Hai Yang Ju ◽  
Zheng Ye
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Concentration Distribution ◽  
Specific Area ◽  
Dust Particles ◽  
Dust Deposition ◽  
Simulation Research ◽  
Model Research ◽  
Mine Roadway ◽  
Different Diameters

At present, study of coal mine dust mainly focuses on the specific area of concentration distribution of particles of different diameters, and the trajectory of the research, especially the numerical simulation research is rarely involved, this paper applies the method of numerical simulation, and the establishment of dust particles starting mathematical model, research dust in coal mine roadway within the two flying of dust flying, aiming at the two problems, putting forward reasonable and effective methods to prevent the harm caused by secondary dust flying.

Numerical Simulation Analysis of Different Coal Mine Roadway Support Effect

2013 ◽  
Vol 807-809 ◽  
pp. 2356-2360 ◽  
Author(s):  
Guang Yi Sun ◽  
Xiao Luo
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Simulation Analysis ◽  
Support Effect ◽  
Surrounding Rock ◽  
Anchor Cable ◽  
Mine Roadway ◽  
Coal Wall ◽  
Roadway Support

The application of FLAC2D software long ditch coal mine extraction tunnel without support boltgrouting. Anchor when the anchor rope supporting and strengthening supporting state ofroadwaywere simulated and analyzed the change of roadway surrounding rock under differentsupport forms. Demonstrated the possibility that the current anchor cable anchor supporting andanalysis under the condition of the coal wall broken grouting bolt is the necessity of reinforcement.

Study and Application on the Parameters of Gob-Side Entry Retaining in Thin Seam with Limestone Roof

2011 ◽  
Vol 361-363 ◽  
pp. 193-197 ◽  
Author(s):  
Zhong Ping Guo ◽  
Jia Li Qi ◽  
Hui Qiang Duan
Keyword(s):  
Numerical Simulation ◽  
Cross Section ◽  
Coal Mine ◽  
Field Observation ◽  
Mechanical Model ◽  
Technical Parameters ◽  
Coal Recovery ◽  
Safe Production ◽  
The Face ◽  
Thin Seam

The gob-side entry retaining technology can be used to not only solve the problem of intensity in successive mining but also reduce the 10,000 tons' drivage rate and improve the coal recovery. Based on the established roof cutting mechanical model, the method of numerical simulation is used to determine the technical parameters of gob-side entry retaining in one coal mine. The reduction in cross-section of the roadway is 10.8% according to the field observation, which shows that the gob-side entry retaining has obtained preferable results and fulfilled the demand of safe production in the face.

Simulation and Parameters Analysis of Fault Geological Structure for Detection in the Excavation Face

2013 ◽  
Vol 448-453 ◽  
pp. 3742-3746
Author(s):  
Wei Jie Zhang ◽  
Ming Rui Hao ◽  
Zhi Min Liu ◽  
Xi Gao Liu ◽  
Miao Wu
Keyword(s):  
Coal Mine ◽  
Apparent Resistivity ◽  
Induce Polarization ◽  
Geological Structure ◽  
Electrical Parameters ◽  
Detection Model ◽  
Detection Technology ◽  
Mine Roadway ◽  
Coal Rock ◽  
Parameters Analysis

In order to study on the advanced detection technology and the sensitivity of the Fault geological structure based on induce polarization (IP) method, and analyze the hazards of the Fault geological structure in front of the excavation face of coal mine roadway. This paper establishes a simplified physical model of the structure and converts the model into an equivalent circuit for convenient study and then constructs an IP model of the Fault geological structure. The IP model is connected with the simulation detection model of geological abnormal mass to obtain the changed curves of the apparent resistivity and the apparent frequency under the IP mode. The curves obtained show that simulation detection results agree with the electrical parameters specified by the IP model. Therefore the basic idea of the electric method detection is verified, which will provide a feasible presupposition for the development of the coal (rock) IP effect based on the advanced detection instruments with the electric method.

Numerical Simulation Study on Combined Supporting Scheme of Bolts and Anchor Cable

2014 ◽  
Vol 638-640 ◽  
pp. 898-903
Author(s):  
Wen Cai Wang ◽  
Wen Bin Wei ◽  
Ling Wang
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Coal Mine ◽  
Simulation Software ◽  
Practical Application ◽  
Anchor Cable ◽  
Result Show ◽  
The Face

Aiming at the face roadway 22109 of Cuncaota coal mine, using FLAC3Dnumerical simulation software, 19 of 5 groups about bolt and anchor combined support schemes were analysed and compared, and the reasonable scheme of φ18×2000mm thread steel bolt and φ17.8×6500mm anchor cable combined support was obtained. Support result of this scheme was analysed with FLAC3Dsoftware, the result show that this scheme can support the roadway effectively. Practical application show that this scheme can achieve the security, economical and effective support result, and can be used in this type of roadway.

Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation

2016 ◽  
Vol 9 (1) ◽  
pp. 47-54
Author(s):  
Jing Shen ◽  
Mingran Chang
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Heat Dissipation ◽  
Spontaneous Combustion ◽  
Oxidation Zone ◽  
Effect Analysis ◽  
Mine Fire ◽  
Nitrogen Injection ◽  
The Difference ◽  
Residual Coal

One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.

The Model for Calculating Elastic Modulus and Poisson's Ratio of Coal Body

2013 ◽  
Vol 6 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Ai Chi ◽  
Li Yuwei
Keyword(s):  
Elastic Modulus ◽  
Poisson’S Ratio ◽  
Fractured Rock ◽  
Rock Block ◽  
Poisson's Ratio ◽  
Linear Elastic ◽  
Study Results ◽  
The Face ◽  
Block Face ◽  
Coal Rock

Coal body is a type of fractured rock mass in which lots of cleat fractures developed. Its mechanical properties vary with the parametric variation of coal rock block, face cleat and butt cleat. Based on the linear elastic theory and displacement equivalent principle and simplifying the face cleat and butt cleat as multi-bank penetrating and intermittent cracks, the model was established to calculate the elastic modulus and Poisson's ratio of coal body combined with cleat. By analyzing the model, it also obtained the influence of the parameter variation of coal rock block, face cleat and butt cleat on the elastic modulus and Poisson's ratio of the coal body. Study results showed that the connectivity rate of butt cleat and the distance between face cleats had a weak influence on elastic modulus of coal body. When the inclination of face cleat was 90°, the elastic modulus of coal body reached the maximal value and it equaled to the elastic modulus of coal rock block. When the inclination of face cleat was 0°, the elastic modulus of coal body was exclusively dependent on the elastic modulus of coal rock block, the normal stiffness of face cleat and the distance between them. When the distance between butt cleats or the connectivity rate of butt cleat was fixed, the Poisson's ratio of the coal body initially increased and then decreased with increasing of the face cleat inclination.

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