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The slow excavation speed of coal roadways has always been a key factor restricting the safe and efficient production of large-scale coal mines in China, and the problem of unbalanced mining replacement caused by this is widespread. This paper takes the S1231 heading face of the Ningtiaota coal mine of Shaanxi Coal and Chemical Industry Group as th...
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The strong disturbance of upward mining of the short-distance multiseam results in frequent fractures in the coal seam to be mined, jeopardizing the operation safety due to the instability of the surrounding rock of the overlying stope and risks of coal and gas outburst. A lucrative alternative is the downward mining of multiseam, which wide implem...
The gangue filling mining method is used to reduce the occurrence of dynamic disasters on the roof of a steeply dipping coal seam (SDCS) effectively and improve the stability of the overburden structure. To comprehensively study the movement law of the overburden under different filling quantities, the 3221 working face of the Lvshuidong coal mine...
![Figure 3: Type of roadway floor heave [38].](publication/362251223/figure/fig3/AS:11431281102979338@1669583372067/Type-of-roadway-floor-heave-38_Q320.jpg)
As one of the most common disasters in deep mine roadway, floor heave has caused serious obstacles to mine transportation and normal production activities. The third section winch roadway in the third mining area of Qitaihe Longhu coal mine has a serious floor heave due to the large buried depths of the roadway and the semicoal rock roadway, and th...
Disturbance stresses can cause deformation and damage to a tunnel’s rock, potentially threatening the mine’s safety. This paper investigates the effects of disturbance damage on the main inclined shaft due to the excavation of an electromechanical chamber in a deep inclined shaft at Yuxi Mine. Specifically, a numerical model was constructed using M...
To explore the instability mechanisms of coal pillars in the upper coal during coal seam group mining in the Yulin area and hence to achieve safe and green mining of the lower coal seams, the engineering geological condition for no. 3−1, no. 4−2, and no. 5−2 coal seams in the north-second panel area of Hongliulin Coal Mine was investigated in this...
Citations
... Moreover, the number of gas accidents and deaths in large accidents accounted to 84.6% and 92.1, respectively (Wang et al. 2017a(Wang et al. , b, 2022aKong et al. 2021a, b). In the mining process of coal and gas outburst coal seam, the failure of overlying strata and the development of crack evolution are induced accompanying with the gas emission, flow and convergence and resulting in a large amount of gas accumulation in the goaf (Sun et al. 2016;Cheng et al. 2020;Cheng et al. 2021a, b;Li et al. 2022;Yan et al. 2022). Subsequently, the gas is more likely to enter the return airflow roadway and working face due to the negative pressure generated by the ventilation causing the gas overrun, which seriously restricts the safe and efficient mining of coal resources and has become a key problem to be solved urgently (Hu et al. 2020;Li et al. 2021;Xiao et al. 2021;Zhu et al. 2021). ...
Gas disasters are more prominent in complex coal conditions, especially for the close distance coal seam mining that the gas control in the upper corner of the return airflow roadway in lower coal seam has seriously restricted the safe production of coal mine. In this study, taking Anshun coal mine as engineering background, the accumulation law of large amounts of gas in the goaf in the low-medium positions of overburden fracturation zone is revealed after considering the desorption of the residual coal in the goaf and the gas emission from the upper adjacent layer through comprehensively research methods including geophysical survey, porous medium seepage theory and numerical simulation. The directional drilling is proposed to control gas, and the influence of drilling layer, extraction negative pressure and horizontal distance of directional drilling on gas migration in goaf is analyzed to optimize the precision extraction scheme. Finally, the optimization gas extraction scheme is adopted on filed applications. The results show that the gas concentration in the upper corner of the return airflow roadway can reduce to less than 0.4% meeting the requirements of safe mining when the extraction negative pressure is 12.5 kPa, the borehole is arranged in the carbonaceous clay rock with the horizontal distance of 10 m from the return airflow roadway and the height of 12 m from the coal seam. The gas extraction scheme is of great theoretical and practical significant for the similar conditions of close distance coal seam safety mining.
... Stress change is an inherent dynamic cause of the deformation and failure of deepburied roadways. Analyzing the stress trend under different factors is helpful for studying the characteristics of roadway deformation [52][53][54]. In this study, the maximum vertical stress on the roof and floor, and the maximum horizontal stress on the two sides of the roadway, were analyzed. ...
With the development of deep, underground coal mines in China, the failure mechanism of the rocks surrounding roadways is becoming increasingly complicated and the deformational control is also significantly difficult. In this study, based on the temporal and spatial deformational distribution of the deep roadway area in the 2233 working face of Fuxin Hengda Coal Mine, factors affecting the deformation and failure mechanism of deep-buried roadways, such as cohesion (c), tensile strength (), internal friction angle (φ), vertical ground stress (p), and the horizontal-to-vertical stress ratio (λ), were analyzed using orthogonal numerical experiments. The stress and electromagnetic radiation monitoring data were used to locate areas of highly concentrated deformation in the roadway and surrounding rocks. The results show that the order of the degree of influence of the surrounding rock and geometric parameters on the deformation of the deep-buried roadway is φ > p> > λ > c. The vertical stress of the roof and the horizontal stress of the two sides are negatively correlated with the tensile strength and horizontal-to-vertical stress ratio, respectively, and mainly shear failure occurs in the area. The higher the level of the surrounding rock, the more serious is the deterioration and deformation. The electromagnetic radiation reflects the distribution range of the high-stress concentration area and strength deterioration area. The test results accurately describe the deformation–deterioration-failure laws of rock surrounding deep-buried roadways influenced by different factors. The results are of great significance for analyzing the deformation and failure characteristics of rocks surrounding roadways, preventing rockburst, and supporting the parameter optimization of roadways.
