Numerical simulation of the dynamic formation process of fog-haze and smog in transport tunnels of a hot mine

Zou, Shenghua; Li, Kong-qing; Han, Qing; Yu, Chuck Wah

doi:10.1177/1420326x16666621

Cited by 18 publications

(9 citation statements)

References 13 publications

(14 reference statements)

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“…Ventilation volume flow rate was determined by the minimum dust exhaust air volume, [52][53][54] and its calculation method is shown in equation (15). where Q 0 is the volume flow rate of tunnel ventilation air (m 3 /s), v 0 is the dust removal rate of tunnel, S 0 is the cross-sectional area of the heading face of the single head tunnel (m 2 ).…”

Section: Ventilation Volume Oxygen Supply Volume and Ratementioning

confidence: 99%

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The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

Wang

Zhao

2022

Indoor and Built Environment

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Hypoxia plays a major role in limiting the construction of the high-altitude mine. Understanding the effect and the distribution of diffused oxygen supply at different altitudes is the premise for the design of a mine with oxygen supply system and the full utilization of oxygen resources. For the optimal design of an oxygen supply mode and ventilation system, a multi-component fluid model of the diffused oxygen supply of a single-head tunnel was developed. This study reveals the variation law of the average oxygen mass fraction at different altitudes. The relationship between the distance from the heading face and the oxygen mass fraction at each altitude was fitted. The results show that the distribution of oxygen mass fraction in a single head tunnel at different altitudes presents a similar trend of increasing first and then decline. In addition, the change of the average oxygen mass fraction with the increase of altitude is not linear, and the dispersion loss is larger in high-altitude areas. The largest oxygen enrichment area is distributed at the altitudes of 4000–4500 m. This study provides theoretical support for improving the hypoxic environment of high-altitude metal mines excavation work.

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Section: Ventilation Volume Oxygen Supply Volume and Ratementioning

confidence: 99%

“…Ventilation volume, oxygen supply volume and rate: Ventilation volume flow rate was determined by the minimum dust exhaust air volume, 52–54 and its calculation method is shown in equation (15).…”

Section: Boundary and Initial Conditionsmentioning

confidence: 99%

The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

Wang

Zhao

2022

Indoor and Built Environment

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“…The establishment of a rock damage constitutive model based on the randomly distributed internal defects is another effective approach to study the constitutive relation of rock materials [ 23 ]. Experimental and numerical evidence shows that rock failure is a gradual process [ 24 ], which is the result of the propagation of random distributed primary fractures and the generation and development of new fractures [ 25 , 26 ]. Such randomness can be indicated by statistical methods.…”

Section: Introductionmentioning

confidence: 99%

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

et al. 2023

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The rock or rock mass in engineering often contains joints, fractures, voids, and other defects, which are the root cause of local or overall failure. In response to most of the current constitutive models that fail to simulate the nonlinear fracture compaction deformation in the whole process of rock failure, especially brittle rocks, a piecewise constitutive model was proposed to represent the global constitutive relation of rocks in this study, which was composed of the fracture compaction empirical model and the damage statistical constitutive model. The fracture empirical compaction model was determined by fitting the expressions of fracture closure curves of various rocks, while the rock damage evolution equation was derived underpinned by the fracture growth. According to the effective stress concept and strain equivalence hypothesis, the rock damage constitutive model was deduced. The model parameters of the fracture compaction empirical model and damage statistical constitutive model were all calculated by the geometrical characteristics of the global axial stress–strain curve to guarantee that the models are continuous and smooth at the curve intersection, which is also simple and ready to program. Finally, the uniaxial compression test data and the triaxial compression test data of different rocks in previous studies were employed to validate the models, and the determination coefficient was used to measure the accuracy. The results showed great consistency between the model curves and test data, especially in the pre-peak stage.

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“…Research on the deformation and strength characteristics of joints aims to provide a basis for the evaluation and utilization of rock mass stability [ 7 , 8 ]. In view of this, many scholars have systematically carried out a large number of studies on the shear strength and deformation characteristics of joints from theoretical derivations [ 9 , 10 ], laboratory tests [ 11 , 12 , 13 , 14 , 15 ] and numerical simulations [ 16 , 17 , 18 ]. The research content includes the effect of size, roughness, freeze–thaw action, infilled material, bolt mode, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

et al. 2023

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As a composite material, the stability of rock mass is usually controlled by a joint. During the process of excavation, the normal stress of the joint decreases continuously, and then the shear strength of the joint decreases, which may eventually lead to the instability and failure of rock mass. Previous studies have mainly focused on the shear behavior of joints under constant normal stress, but have rarely considered the unloading of normal stress. In this paper, a direct shear test of joints with different roughness was carried out, in which the shear stress remained unchanged while the normal stress decreased. The strength characteristics of joints were explored, and the deformation and acoustic emission-counting characteristics of joints were analyzed by digital image correlation (DIC) techniques and acoustic emission (AE). A new method for predicting the instability of joints under normal unloading was proposed based on the evolution law of normal deformation energy (Un), tangential deformation energy (Us) and total deformation energy (U0). The results show the following: (1) The unloading amount of normal stress was enlarged for greater initial normal stress and roughness, while it decreased with an increase in initial shear stress. (2) AE events reached their maximum when the normal stress was equal to the failure normal stress, and the b-value fluctuated more frequently in stable development periods under normal unloading conditions. (3) U0 would change with the loading and unloading of stress, and this may be used to predict the unloading instability of rock mass using the abrupt change of U0.

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Numerical simulation of the dynamic formation process of fog-haze and smog in transport tunnels of a hot mine

Cited by 18 publications

References 13 publications

The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

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