The Impact Analysis of Coal’s Elastic Energy on the Coal and Gas Outburst Shock Wave

2012 ◽  
Vol 616-618 ◽  
pp. 390-395
Author(s):  
Cheng Wu Li ◽  
Tian Bao Gao ◽  
Shan Yang Wei ◽  
Teng Li
Keyword(s):  
Shock Wave ◽  
Elastic Energy ◽  
Impact Analysis ◽  
Dynamic Theory ◽  
Coal And Gas Outburst ◽  
Calculation Formula ◽  
Theory Analysis ◽  
Gas Outburst ◽  
Quantitative Calculation ◽  
The Impact

According to the gas dynamic theory, this paper deduces the approximate calculation formula on elastic energy of a tons of coal through theory analysis, and then gets the quantitative calculation method between incident overpressure and reflected overpressure of the coal and gas outburst shock wave. The calculation formula in this paper is in line with the measured values, and so its validity has been verified. The analysis result shows that the effect of the elastic energy during the process of coal and gas outburst should be considered when the depth of the coal seam is great and the coal’s modulus of elasticity is small.

Experimental study of the impact of gas adsorption on coal and gas outburst dynamic effects

2019 ◽  
Vol 128 ◽  
pp. 158-166 ◽  
Author(s):  
Jie Cao ◽  
Linchao Dai ◽  
Haitao Sun ◽  
Bo Wang ◽  
Bo Zhao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Adsorption ◽  
Coal And Gas Outburst ◽  
Dynamic Effects ◽  
Gas Outburst ◽  
The Impact

The Impact Analysis of Signal Intersection Right-Turn Motor Vehicles on Straight Bicycles

2012 ◽  
Vol 253-255 ◽  
pp. 2014-2019
Author(s):  
Lin Wang ◽  
Shu Ping Jia
Keyword(s):  
Data Analysis ◽  
Impact Analysis ◽  
Motor Vehicle ◽  
Motor Vehicles ◽  
Calculation Formula ◽  
Flow Calculation ◽  
Vehicle Traffic ◽  
The Impact

The characteristics of the intersection of bicycle was studied through survey and data analysis, and we got straight bicycle losses flow calculation formula under the influence of right turn motor vehicle. Through simulation to analysis the impact of its capacity further when motor vehicle traffic, plus the deceleration and the proportion of bus changes, and measures were proposed to improve bicycle capacity.

scholarly journals Research on the Force Characteristics and Structural Optimization of Mine Antioutburst Door under the Influence of Coal and Gas Outburst Impact Airflow

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Linchao Dai ◽  
Haitao Sun ◽  
Xusheng Zhao ◽  
Bo Wang ◽  
Jie Cao
Keyword(s):  
Simulation Experiment ◽  
Impact Load ◽  
Ventilation System ◽  
Coal Mines ◽  
Coal And Gas Outburst ◽  
Shock Loads ◽  
Research Results ◽  
Gas Outburst ◽  
Key Technologies ◽  
The Impact

In order to deeply explore the destructive effect of the impulsive airflow on the mine antioutburst door when coal and gas outbursts occur in underground coal mines, a large-scale coal and gas outburst dynamic effect simulation experiment device is used to carry out the coal and gas outburst disaster simulation experiment. The impact load and deformation characteristics of the antioutburst door under the impact airflow during coal and gas outburst are analyzed, and the experimental results are discussed in depth through numerical simulation analysis and field example analysis. Based on this, the internal and external causes of the damage of the antioutburst door on the coal mine site are analyzed, the key technologies that need to be solved in the design of the antioutburst door’s disaster resistance are studied, and the overall design of the structure optimization design of the antioutburst door is proposed. The research results show that after coal and gas outburst, the pressure on the antioutburst door will rise and fall, and the fluctuation will be greater. Under the same installation position, the farther the antioutburst door is from the protruding point, the less pressure it bears. In the middle and late stages of the outburst, intermittent negative pressure of the gas at the antioutburst door appeared. The key technologies for the design of the antioutburst door and its disaster resistance mainly include that strengthen theoretical and experimental research on the formation mechanism of outburst shock waves in mines, the interaction mechanism between disaster shock loads and dampers, and the magnitude of disaster expected shock loads; optimize the structure of the antioutburst door size, the width of the contact surface between the air door and the door wall, the stress distribution of the air door under impact load, the design of the safety hole, and the locking device; and improve the disaster monitoring and alarm capabilities of the antioutburst door and collect changes in antioutburst door pressure in real time. The research results provide a theoretical basis and technical support for the optimization of the antishock performance of underground antioutburst doors in coal mines and have important practical significance for improving the disaster resistance of the ventilation system.

Study on the propagation law of shock wave resulting from coal and gas outburst

2011 ◽  
Vol 17 (2) ◽  
pp. 142-146 ◽  
Author(s):  
Kai Wang ◽  
Ai-tao Zhou ◽  
Pin Zhang ◽  
Chuan Li ◽  
Yan-wei Guo
Keyword(s):  
Shock Wave ◽  
Coal And Gas Outburst ◽  
Gas Outburst ◽  
Propagation Law

The Impact of a Potential Public/Private Initiative on a Defined Region of the South Suburban Chicago Metropolitan Area

2019 ◽  
pp. 14-32
Keyword(s):  
Supply Chain ◽  
Economic Impact ◽  
Impact Analysis ◽  
Census Data ◽  
Economic Benefits ◽  
Local Economy ◽  
Market Area ◽  
State And Local ◽  
The University ◽  
The Impact

The university is considered one of the engines of growth in a local economy or its market area, since its direct contributions consist of 1) employment of faculty and staff, 2) services to students, and supply chain links vendors, all of which define the University’s Market area. Indirect contributions consist of those agents associated with the university in terms of community and civic events. Each of these activities represent economic benefits to their host communities and can be classified as the economic impact a university has on its local economy and whose spatial market area includes each of the above agents. In addition are the critical links to the University, which can be considered part of its Demand and Supply chain. This paper contributes to the field of Public/Private Impact Analysis, which is used to substantiate the social and economic benefits of cooperating for economic resources. We use Census data on Output of Goods and Services, Labor Income on Salaries, Wages and Benefits, Indirect State and Local Taxes, Property Tax Revenue, Population, and Inter-Industry to measure economic impact (Implan, 2016).

Impact Analysis of the Mechanization Program for Tribal Paddy Farmers of Goa

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
MATHALA JULIET GUPTA ◽  
ASHISH M. PITRE ◽  
SUMATI CHAVAN PANDURNAG ◽  
SALONI SALIL VANJARI
Keyword(s):  
Impact Analysis ◽  
Field Capacity ◽  
Significant Saving ◽  
Manual Methods ◽  
Paddy Farmers ◽  
The Impact ◽  
And Training

This paper assessed the impact of the mechanization of the 8 tribal paddy farmers’ groups of Goa benefited in the year 2011 through the Tribal sub-plan program of ICAR-CCARI through results of surveys conducted in 2012 and 2015. Shift to mechanization among beneficiaries was significant in power tillers (64-100%) but less in power reapers(0-91%). Also significant saving in manpower (Power tillers:33.3% to 60%, power reapers: 33.3% to 83.3%), , time (field capacity increased (power tillers : 41.7% to141%, power reapers :58.1% to 912.8%) and cost(power tillers :44.7% to 59.1%, power reapers : 57.8% to 82.9%) was reportedthrough the use of equipment as compared to desi plough or manual methods of harvesting. Some constraints like lack of access roads and training in use and maintenance of the equipment were reported by the beneficiary farmers.

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