Haixiao Lin’s research while affiliated with Henan Polytechnic University and other places

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Publications (10)


Temperature Response Characteristics of Coal Freezing Process Based on Thermal Conductivity Hyperbolic Model
  • Article

January 2025

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4 Reads

JOM: the journal of the Minerals, Metals & Materials Society

Gaowei Yue

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Zihao Li

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Minmin Li

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[...]

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Haixiao Lin

To achieve rapid freezing of the coal body in the step during rock cross-cut coal removal by freezing method, coal thermal conductivity with different water capacities at varying freezing temperatures is experimentally tested, and the hyperbolic model of thermal conductivity is proposed. The model parameters are optimized using the artificial neural network (ANN) method, and the model can mimic the change rule about thermal conductivity with temperature during the freezing process. Meanwhile, the time-varying law during the freezing process of the coal body is numerically analyzed using the thermal conductivity hyperbolic model and heat conduction theory; simulation results are analyzed and compared with measured results. After optimizing three parameters of the thermal conductivity hyperbolic model with the ANN approach, the calculated thermal conductivity values are distributed on a 1:1 line with measured results. This indicates that combining heat conduction theory with the thermal conductivity hyperbolic model can accurately predict the time-varying characteristics of temperature during the freezing process of the coal body with moisture content. Moreover, when coal body water capacity is about 12%, and its temperature decreases the fastest during freezing process This method establishes a theoretical foundation for forecasting the temperature aging properties of rapid freezing during the rock cross-cut coal removal process.


Experiment of air sound insulation of tempered vacuum glass (TVG) and layout of testing points.
Sound insulation loss of tempered vacuum glass (TVG) (5 + 0.35V + 5) at different frequencies.
Sound insulation model of tempered vacuum glass.
Comparison theoretical results (Calculated by Equation (20)) with measured results of sound transmission loss.
Influence of acoustic incidence angle on sound insulation loss.

+3

Sound insulation performance of tempered vacuum glass: Theory and experiment
  • Article
  • Publisher preview available

January 2025

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13 Reads

Compared with insulating glass, tempered vacuum glass (TVG) is not only safer, but also more effective in sound insulation and heat insulation. In this paper, for the sound insulation performance of tempered vacuum glass, the acoustic wave transfer model of TVG is established, and the equation for sound insulation is deduced by using wave transfer method (WTM). Then the actual sound insulation loss of tempered vacuum glass was tested based on the method of reverberation room and anechoic room. finally, the sound insulation loss of tempered vacuum glass under different factors is analyzed. The results show that the theoretical calculation results are consistent with the experimental results about the general change trend of the sound insulation. The thicker the glass, the better the sound insulation. The more the supports in vacuum layer of tempered vacuum glass, the smaller the sound insulation loss. The thickness of the vacuum layer has different sound insulation loss at different frequencies. When the thickness of the vacuum layer is about 0.25 mm, tempered vacuum glass has the best sound insulation performance. This research will have important guiding significance for the selection of building sound insulation glass and the design of sound insulation glass.

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An improved inversion of Donghekou landslide considering “starting-elastic-impulsive” acceleration mechanism

September 2023

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9 Reads

Bulletin of Engineering Geology and the Environment

High-speed remote landslides have been the focus of landslide research because of their fast movement, long sliding distance, and large damage range. This paper takes the Donghekou landslide as an example and establishes a more reasonable 3D model based on high-precision DEM data. Under the premise of considering the landslide initiation mechanism, the complete dynamic process of Donghekou landslide initiation-acceleration-impact fold-deceleration accumulation is reproduced by PFC3D numerical simulation software. The numerical simulation results are consistent with the actual situation. The results show that the Donghekou landslide took about 20 s from the moment of initiation to the moment of impact with the barrier, about 25 s from the start of impact with the barrier to the complete departure from the barrier, and about 19 s from the end of impact to deposition. The maximum velocity of about 58.5 m/s and the maximum displacement of about 2159.0 m are typical of ultra-high-speed remote landslides. The maximum displacement and maximum velocity of the slide show a decreasing pattern from head to tail and from surface to base, except for the distribution of the maximum displacement at the head, which does not show a clear pattern. Divide the sliding mass into left and right parts, for sliding mass with the same longitudinal position: the left side has the maximum velocity and the right side has the maximum displacement.


Microstructure Study of High-Rank Coal in an Alkaline Solution at the Chengzhuang Mine

April 2023

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8 Reads

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2 Citations

Langmuir

To study the adsorption performance of coal bodies after alkaline solution erosion and the microscopic mechanism of alkali erosion on coal bodies, isothermal adsorption experiments at different pH values and with different numbers of soaking days were conducted on high-order coal bodies from the Chengzhuang mine. The results showed that the adsorption capacity of the coal bodies after alkali leaching was improved compared to that of the original coal, all of which was in accordance with the Langmuir equation. The unit adsorption capacity of coal samples increased gradually with an increase in the number of soaking days and solution pH, reaching the maximum at pH 13 and eight soaking days. The adsorption constant a of the coal sample was positively correlated with the pH, and the number of soaking days was a power exponential function; the adsorption constant b increased gradually with an increase in the pH of the solution and increased first and then decreased with an increase in the number of soaking days. The change in the adsorption of coal samples occurs because the alkaline solution reacts with the minerals in the coal as well as the mineral ions, and the resulting complex gels and precipitates block the pore channels of the coal body, which in turn inhibits the adsorption of gases. The presence of Na, Mg, Al, Si, Ca, Fe, and other elemental compounds detected in the generated sediments verified the mechanism of alkaline solution erosion. The changes in the microscopic pore structure of the coal body were quantified by low-temperature liquid nitrogen adsorption experiments. The small and medium pore volumes of the coal samples reached the maximum values at pH 13 and with eight soaking days, which is in agreement with the conclusion of optimal alkali modification.




Numerical Analysis of Dynamic Evolution Characteristics of a Large Rock Landslide in Tangjiashan

November 2022

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175 Reads

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3 Citations

The study of landslide dynamic characteristics and accumulation patterns is of great significance for the quantitative evaluation of landslide hazards. This paper takes the Tangjiashan landslide as a research case, a real 3D model was established based on high precision DEM data to determinate the terrain characteristics and pre- and postlandslide image data to determinate the shape and size of the sliding body. Particle flow 3D program (PFC3D) is carried out to reappear the complete movement of the Tangjiashan landslide. And the dynamic characteristic factors are monitored and analyzed such as the velocity and displacement of the landslide body. The result shows that the Tangjiashan landslide is a traction-type landslide, which lasts about 37 s in total and can be divided into four stages: destabilization and destruction, collapse and accelerated sliding, high-speed sliding, and deceleration and accumulation. The maximum sliding distance is about 642.05 m and the maximum sliding speed is about 38.67 m/s. This is a typical high-speed short-range landslide, and the speed of sliding body surface is much greater than that of other parts, which show an obvious characteristic of clastic flow. In the Tangjiashan landslide, the slip distance is the controlling factor in determining the speed of the landslide at different locations.


Study on the Critical Value of Residual Gas Content Based on the Difference of Adsorption Structure between Soft and Hard Coal

June 2021

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57 Reads

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7 Citations

ACS Omega

In view of the difference of the adsorption structure between soft and hard coal, there is a big difference in the critical value of the inspection index for the regional outburst risk caused by the gas content. For the coal seams with soft and hard coal stratification, the model of gas content in the equilibrium state was established first, and the microscopic parameters of different rank coals were determined by the low-temperature liquid nitrogen adsorption test and mercury intrusion test. Then, the adsorption capacity of coal samples was determined by the adsorption test. Finally, the residual gas content of the coal seam in the equilibrium state was calculated based on the adsorbed gas content, and the critical value of prediction indexes of regional outburst based on the residual gas content was studied. The results show that for the same metamorphic degree, the specific surface area of soft coal is larger than that of hard coal. However, under the same gas pressure, the residual gas content of hard coal of anthracite and lean coal is greater than that of soft coal with the same metamorphic degree, while that of meager-lean coal and gas-fat coal is opposite. It is suggested to adopt the small value (rounded) of the measured gas content of soft and hard coal at 0.74 MPa as the critical value of the residual gas content in the regional effect test from the economic perspective. It is of great significance to determine the critical standard of the residual gas content in the regional effect test according to local conditions for reducing the cost of outburst prevention work.

Citations (1)


... 24−26 The adsorbed gas dissociates from the coal matrix to fracture through a desorption−diffusion process and escapes outward under the action of differential pressure. 12,23,27 The gas desorption process is regarded as gas diffusion from a collection of spherical coal particles with a zero surface concentration and a constant initial gas concentration. 23,28−30 On the basis of related research and guidelines, 29,30 the cumulative desorption gas volume at the initial time is directly proportional to the square root of time, which is used to calculate the lost gas content. ...

Reference:

Effective Approach with Extra Desorption Time to Estimate the Gas Content of Deep-Buried Coalbed Methane Reservoirs: A Case Study from the Panji Deep Area in Huainan Coalfield, China
Study on the Critical Value of Residual Gas Content Based on the Difference of Adsorption Structure between Soft and Hard Coal

ACS Omega