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Wyszukujesz frazę "An, Huaming" wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Numerical modelling of gas pumping in inner interlocked tail roadway of coal mine based on coupled fracture-seepage model
    Autorzy:
    An, Huaming
    Wang, Hongsheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2016497.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    goaf
    collapse of roof
    fluid-solid coupling
    main roof
    immediate roof
    Opis:
    This paper focuses on modelling of pumping high overrun gas in an upper corner and fully mechanized caving face of a coal mine with extra-thick seam. The process of roof fracture and fall in goaf is analyzed. Then the numerical model of the immediate roof and main roof collapse in goaf is established. On the basis of the numerical model, FLUENT is employed to simulate the gas seepage process in the accumulation of the rock and coal in goaf. In addition, the influence of the inner interlocked tail roadway at different positions for the gas concentration in goaf is analyzed. To calibrate the proposed numerical model, it is implemented to a coal mine. It is concluded that numrical results are similar to those in the coal mine.
    Źródło:
    Mining Science; 2021, 28; 33-45
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of explosion stress field of air radial decoupling charge
    Autorzy:
    Yang, Deqiang
    Lei, Zhen
    An, Huaming
    Powiązania:
    https://bibliotekanauki.pl/articles/1402294.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    air radial decoupling charge
    explosion stress field
    concrete model
    numerical simulation
    Opis:
    In order to study the effect of air radial decoupling charge on blasting excavation effect of slope, the effect of radial decoupling coefficient on explosive stress field in rock mass is analyzed theoretically. ANSYS/LS-DYNA software is used to establish a numerical model for stress monitoring of monitoring points. At the same time, the concrete model is poured, the explosion stress field around the blast hole is measured by means of the high-speed multi-channel dynamic stress testing system, and the monitoring results of the two methods are compared with the theoretical analysis results. The results show that with the increase of the radial decoupling coefficient of blasting, the peak value of explosive stress at the same side point decreases obviously, and with the increase of the distance, the stress attenuation becomes slower. Applying the test results to the blasting of slope, it is found that the blasting effect is the best when the aperture decoupling coefficient is 2.75 and the hole spacing is 1.0 m, and the larger the hole spacing is, the less obvious the blasting crack is, which has certain guiding significance for improving the blasting effect.
    Źródło:
    Mining Science; 2020, 27; 19-38
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on radial decoupling charge blasting with air and water
    Autorzy:
    Yang, Deqiang
    An, Huaming
    Lei, Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/1402332.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    radial decoupling charge
    concrete model
    strain
    blasting lumpiness
    boulder yield
    Opis:
    In order to investigate the effects of the different medium on the initial impact pressure and fragmentation of the hole wall under radial decoupling charge, this paper analyzes and compares the initial impact pressure of hole wall and the size of blasting lumpiness theoretically when air and water are used as a coupling medium. Combined with blasting model test, strain datas are collected by high-speed multi-channel dynamic stress testing system, and the lumpiness of the model test is sieved and measured. The blasting lumpiness is analyzed by G–G–S distribution function. The results show that compared with the air radial decoupling charge, the water radial decoupling charge has higher blasting peak pressure and more uniform lumpiness. According to the relation between peak strain pressure and decoupling coefficient, the optimal decoupling coefficients of air and water are 1.71 and 1.67, respectively. The results show that the best blasting effect can be achieved by using a small hole diameter of water-decoupling charge compared with air-decoupling charge. When the decoupling coefficient is 1.50, the average lumpiness size, distribution of large block and boulder yield of blasting lumpiness in water-decoupling medium are minimum, and only the average lumpiness size and distribution of large block are minimum in airdecoupling medium. Applying the test results to the smooth blasting of cutting has certain guiding significance for improving the blasting effect.
    Źródło:
    Mining Science; 2020, 27; 265-281
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of the effect of rock blasting with various cutting forms for tunnel excavation using physical model tests
    Autorzy:
    An, Huaming
    Song, Yushan
    Yang, Deqiang
    Powiązania:
    https://bibliotekanauki.pl/articles/1852379.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wysadzanie skał
    cięcie strumieniowe
    pęknięcie
    forma cięcia
    model fizyczny
    wykop tunelu
    rock blasting
    cutting blasting
    fracture
    cutting form
    physical model
    tunnel excavation
    Opis:
    Cutting blasting has been widely used for tunnel excavation. The cutting forms significantly influence the blasting effect. This research focuses on the study of the relationship between cutting forms and blasting effects. Similarity theory is proposed for the experimental study of the rock blasting using small models. Then four experimental modes with different cutting forms are used to study the blasting effect due to the cutting forms. The cutting depth, borehole utilization rate, fragments volume, and average fragment size are analysed. The blasting effects with various cutting forms are compared. The influences of the borehole space and the blasting delay are discussed. It is concluded that the spiral cutting form can produce more fragments and is recommend for the small section tunnel excavation.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 3; 599-618
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of projection pursuit regression model for blasting vibration velocity peak prediction
    Autorzy:
    Shi, Jianjun
    An, Huaming
    Wei, Xin
    Powiązania:
    https://bibliotekanauki.pl/articles/1852582.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wibracje wybuchowe
    przewidywanie
    prędkość drgań
    model regresji
    pościg projekcji
    płytki tunel
    algorytm genetyczny
    blasting vibration
    vibration velocity
    prediction
    projection pursuit
    regression model
    shallow tunnel
    genetic algorithm
    Opis:
    Based on Projection Pursuit Regression Theory (PPRT), a projection pursuit regression model has been established for forecasting the peak value of blasting vibration velocity. The model is then used to predict the peak value of blasting vibration velocity in a tunnel excavation blasting in Beijing. In order to train and test the model, 15 sets of measured samples from the tunnel project are used as the input data. It is found that predicting results by projection pursuit regression model on the basis of the input data is much more reasonable than that predicted by the traditional Sodaovsk algorithm and modified Sodaovsk formula. The results show that the average predicting error of the projection pursuit regression model is 6.36%, which is closer to the measured values. Thus, the projection pursuit prediction model is a practical and reasonable tool for forecasting the peak value of blasting vibration velocity.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 653-673
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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