Experimental research on the law of the deformation and damage characteristics of raw coal/ briquette adsorption-instantaneous pressure relief

Fuel ◽  
2022 ◽  
Vol 308 ◽  
pp. 122062
Author(s):  
Aitao Zhou ◽  
Chang'ang Du ◽  
Kai Wang ◽  
Jiaying Hu ◽  
Xihui Fan
Keyword(s):  
Experimental Research ◽  
Pressure Relief ◽  
Damage Characteristics ◽  
Instantaneous Pressure ◽  
The Law

scholarly journals Experimental Study on the Coal Damage Characteristics of Adsorption-Instantaneous Pressure Relief in Coal Containing Gases with Different Adsorption Characteristics

2019 ◽  
Vol 9 (23) ◽  
pp. 5223 ◽  
Author(s):  
Du ◽  
Sun ◽  
Guo ◽  
Wang ◽  
Cheng
Keyword(s):  
Coal Mining ◽  
Gas Adsorption ◽  
Axial Strain ◽  
Radial Strain ◽  
Test System ◽  
Pressure Relief ◽  
Adsorption Characteristics ◽  
Damage Characteristics ◽  
Instantaneous Pressure ◽  
Different Gases

In the process of coal mining, coal and gas outburst is one of the most severe disasters, which is accompanied by the outbursts of CO2, CH4, N2, and other gases. Since the intensity of the outburst is affected by the adsorption characteristics of different gases, the study of the adsorption characteristics of multi-gas in the coal body is of great significance for the prevention and control of coal and gas dynamical outbursts in coal mining. In this paper, the self-developed adsorption-instantaneous pressure relief test system for gas-containing coal was used to study the damage characteristics of multi-gas in briquette adsorption-instantaneous pressure relief and to characterize coal adsorption expansion deformation and instantaneous pressure relief deformation quantitatively. The results showed that under the same temperature and pressure conditions, the adsorption expansion deformation capacities of different gases were in the order of CO2 > CH4 > N2. With the increasing pressure of pressure relief, the damage of the coal body tended to be more significant. Although the briquette exhibited isotropic mechanical properties, the process of adsorption expansion deformation was not completely consistent with the isotropy of deformation, in which the axial strain was slightly larger than the radial strain. Moreover, it was found that the adsorption equilibrium time was positively correlated with gas pressure and gas adsorption characteristics.

VELOCITY OF LONGITUDINAL VIBRATION IN SOLID RODS (ULTRASONIC METHOD) WITH SPECIAL REFERENCE TO THE ELASTICITY OF ICE

1931 ◽  
Vol 5 (6) ◽  
pp. 601-618 ◽  
Author(s):  
R. W. Boyle ◽  
D. O. Sproule
Keyword(s):  
Special Reference ◽  
Experimental Research ◽  
Longitudinal Vibration ◽  
Ultrasonic Method ◽  
Poisson's Ratio ◽  
Velocity Of Sound ◽  
Longitudinal Vibrations ◽  
Simple Method ◽  
Phase Propagation ◽  
The Law

An experimental research showing how corrections in the value of velocity of phase propagation may be made to take into account lateral inertia, and how the law (Rayleigh's) will break down at higher frequencies because of other types of vibration intervening. When the ratio of radius to length, multiplied by the mode of vibration [Formula: see text] exceeds a certain figure (in the case of duralumin, 0.55) the law breaks down, and it appears that radial longitudinal vibrations intervene. From the research a simple method emerges to determine Poisson's ratio, which in the case of duralumin is found to be 0.35.An application of this ultrasonic method is made to determine Young's modulus for ice, in order to find more consistent values than those generally quoted. The value of this modulus for ice at about 0 °C. is found to be about 9 × 1010 dynes/cm2. corresponding to a velocity of sound in it of 3.15 × 105 cm. per sec.

Basic Mechanical Properties Research of SAE Latex-Modified Mortar

2015 ◽  
Vol 1088 ◽  
pp. 621-625 ◽  
Author(s):  
Wei Meng
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Mechanical Behavior ◽  
Experimental Research ◽  
Steel Fiber ◽  
Change Trend ◽  
The Law

Through experimental research under the condition of different ratio of polymer and SAE of modified mortar, compressive and flexural strength of change trend, also studied the 1% content of steel fiber on the mechanical behavior of the SAE modified mortar, for in both cases, examined the mortar specimens respectively than the law of the change of compressive and flexural strength, and the conclusion is given.

Experimental Research on Abrasion Resistance of Alkaline Residue Concrete

2014 ◽  
Vol 1051 ◽  
pp. 687-691
Author(s):  
Yuan Zhang ◽  
Jun Cao ◽  
Yun Dong
Keyword(s):  
Image Analysis ◽  
Experimental Research ◽  
Abrasion Resistance ◽  
Cement Material ◽  
Sem Image ◽  
Curing Period ◽  
The Law ◽  
Sem Image Analysis ◽  
Curing Age

The abrasion resistance of the alkaline residue admixture concrete was observed in the experiment under different conditions, the results showed that: the abrasion resistance of the alkaline residue concrete first increased and then decreased in the law with the increase of alkaline content. The abrasion resistance of concrete is best when the content of alkaline residue is 10% of cement material, combined with SEM image analysis, the microstructure of concrete that alkaline residue accounted for cement material 10% is more dense than others proportions concrete, and the abrasion resistance of concrete will decrease with the increasing the amount of alkaline residue. The experiment also observed the abrasion resistance of the different curing period of the alkaline residue admixture concrete. We could find that the abrasion resistance of concrete increases with the growth of curing age.

Experimental Research on Shock Wave in Water of Underwater Drilling Blasting

2012 ◽  
Vol 193-194 ◽  
pp. 989-994
Author(s):  
Jian Feng Si ◽  
Dong Wang Zhong ◽  
Lin Na Li
Keyword(s):  
Shock Wave ◽  
Experimental Research ◽  
Theoretical Research ◽  
Second Phase ◽  
Pressure Data ◽  
Total Dosage ◽  
Monitoring Test ◽  
The Law ◽  
Single Dosage

Based on theoretical research, waveform curve of shock wave and the pressure data of underwater group of satchel charges were measured by doing the monitoring test in the waterway dredging project of the second-phase construction in Gulei Xiamen. Characteristics and the law of its propagation of shock wave in water produced by the explosion were analyzed, the conclusion which the single dosage is 110 ~ 500kg while the total dosage is 730 ~ 4710kg and the blasting distance is from 74.5 to 220m was given. Semi-theory-semi-experienced formula of the shock wave on this condition was verified. Much valuable experience has been accumulated for the further research.

scholarly journals The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Cheng Cheng ◽  
Xiaoyu Cheng ◽  
Rui Yu ◽  
Wenping Yue ◽  
Chao Liu
Keyword(s):  
Maximum Height ◽  
Gas Migration ◽  
Gas Emission ◽  
Pressure Relief ◽  
Gas Concentration ◽  
Fracture Evolution ◽  
Working Face ◽  
Simulation Results ◽  
The Law ◽  
Overlying Strata

Mining is associated with poor safety due to pressure relief gas emission from the goaf during the production period. The aim of this study was to explore a case study of the Wangjialing coal mine 12322 working face in Shanxi, China, through physical simulation and field observation. The mine is characterized by overlying strata fracture in goaf during the process of working face mining. A mathematical model of gas source emission from the working face and gas migration and the finite element COMSOL software were used to simulate the law of gas migration in the region with overlying strata fissures under the influence of mining. The simulation results were used to explore the law of distribution of pressure relief gas in goaf. Rational parameters of the high-level directional long borehole for the pressure relief gas extraction in goaf were designed based on experimental results. The results showed that the development of the region with overlying strata fissures is affected by mining. In addition, the “trapezoid platform structure” is formed after fracture areas are connected. The maximum height of the stope caving zone was between 26.8 m and 28.1 m, and the maximum height of the fracture zone was approximately 110 m. The gas concentration exhibited a saddle-shaped distribution on the cut surface of the direction of the strike. Furthermore, the gas concentration showed an overall upward trend from the intake airflow roadway to the return airflow roadway and gradually decreased after reaching the maximum. In the vertical direction, gas concentration increased with the increase in the layer, and the position of the highest point of gas concentration gradually shifted to the direction of the intake airflow roadway. Construction parameters of the high directional long borehole were designed through simulation results. After steady extraction and stable extraction, the maximum gas concentration in the upper corner of the working face was 0.49%, and the maximum gas concentration in return airflow was 0.34%. The findings of this study provide information on the law of fracture evolution of overlying strata and gas migration in goaf under the influence of mining. These findings provide a basis for reducing gas overlimit in the working face or return airway corner, thus improving the safety production capacity of the coal mine.

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