A reinforcement method of floor grouting in high-water pressure working face of coal mines: a case study in Luxi coal mine, North China

2022 ◽  
Vol 81 (1) ◽  
Author(s):  
Minglei Zhai ◽  
Haibo Bai ◽  
Luyuan Wu ◽  
Guangming Wu ◽  
Xianzhen Yan ◽  
...  
Keyword(s):  
Coal Mine ◽  
North China ◽  
Water Pressure ◽  
Coal Mines ◽  
High Water ◽  
Working Face ◽  
High Water Pressure

scholarly journals Experimental study on atomization characteristics and dust-reduction performance of four common types of pressure nozzles in underground coal mines

2020 ◽  
Vol 7 (3) ◽  
pp. 581-596
Author(s):  
Han Han ◽  
Pengfei Wang ◽  
Ronghua Liu ◽  
Chang Tian
Keyword(s):  
Coal Mine ◽  
Water Pressure ◽  
Coal Mines ◽  
High Water ◽  
Underground Coal Mines ◽  
Atomization Performance ◽  
Atomization Characteristics ◽  
Dust Reduction ◽  
Pressure Nozzle ◽  
High Water Pressure

Abstract Pressure nozzle is commonly used in the dust-reduction techniques by spraying of underground coal mines. Based on the internal structure, the pressure nozzle can be divided into the following types: spiral channel nozzle, tangential flow-guided nozzle and X-swirl nozzle. In order to provide better guidance on the selection of nozzles for the coal mine dust-reduction systems by spraying, we designed comparing experiments to study the atomization characteristics and dust-reduction performance of four commonly used nozzles in the coal mine underground with different internal structures. From the experimental results on the atomization characteristics, both the tangential flow-guided nozzle and the X-swirl nozzle have high flow coefficients. The atomization angle is the largest in the spiral non-porous nozzle, and smallest in both the X-swirl nozzle and the spiral porous nozzle. The spraying range and the droplet velocity are inversely proportional to the atomization angle. When the water pressure is low, the atomization performance of the spiral non-porous nozzle is the best among the four types of nozzles. The atomization performance of the X-swirl nozzle is superior to other types when the water pressure is high. Under the high water pressure, the particle size of the atomized droplets is smallest in the X-swirl nozzle. Through the experiments on the dust-reduction performance of the four types of nozzles and the comprehensive analysis, the X-swirl nozzle is recommended for the coal mine application site with low water pressure in the dust-reduction system, while at the sites with high water pressure, the spiral non-porous nozzle is recommended, which has the lowest water consumption and obvious economic advantages.

Full-floor Grouting Reinforcement for Working Faces with Large Mining Heights and High Water Pressure: a Case Study in China

2020 ◽  
Vol 39 (2) ◽  
pp. 268-279
Author(s):  
Shiqi Liu ◽  
Yu Fei ◽  
Yanchun Xu ◽  
Lei Huang ◽  
Wenyan Guo
Keyword(s):  
Water Pressure ◽  
High Water ◽  
Grouting Reinforcement ◽  
High Water Pressure

scholarly journals Case study on the application of shield TBM in the gravel layer with high water pressure underpassing the Han River

2016 ◽  
Vol 2 (43) ◽  
pp. 1536-1539
Author(s):  
Chang-soo. Kim ◽  
Jae-yoon. Kim ◽  
Soo-ho. Lee ◽  
Hyun. Cho ◽  
Dong-ahn. Hwang
Keyword(s):  
Water Pressure ◽  
High Water ◽  
Han River ◽  
Gravel Layer ◽  
High Water Pressure

Height of water-conducting fractured zone in a coal seam overlain by thin bedrock and thick clay layer: a case study from the Sanyuan coal mine in North China

2020 ◽  
Vol 79 (6) ◽  
Author(s):  
Hao Fan ◽  
Lianguo Wang ◽  
Yinlong Lu ◽  
Zhaolin Li ◽  
Wenshuai Li ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
North China ◽  
Clay Layer ◽  
Fractured Zone ◽  
Thin Bedrock

A new risk zoning method for water inrush from separated layers at coal mines: a case study, Cuimu coal mine, China

2021 ◽  
Vol 14 (23) ◽  
Author(s):  
Mengnan Liu ◽  
Wei Qiao ◽  
QiangQiang Meng ◽  
Zhongguo Bu
Keyword(s):  
Coal Mine ◽  
Water Inrush ◽  
Coal Mines ◽  
Risk Zoning

scholarly journals Structural modifications of lanthanum silicate oxyapatite exposed to high water pressure

2017 ◽  
Vol 37 (5) ◽  
pp. 2149-2158 ◽  
Author(s):  
Aénor Pons ◽  
Emilie Béchade ◽  
Jenny Jouin ◽  
Maggy Colas ◽  
Pierre-Marie Geffroy ◽  
...  
Keyword(s):  
Water Pressure ◽  
High Water ◽  
Structural Modifications ◽  
Lanthanum Silicate ◽  
High Water Pressure

scholarly journals Analysis on Water Inrush Process of Tunnel with Large Buried Depth and High Water Pressure

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 134 ◽  
Author(s):  
Weimin Yang ◽  
Zhongdong Fang ◽  
Hao Wang ◽  
Liping Li ◽  
Shaoshuai Shi ◽  
...  
Keyword(s):  
High Pressure ◽  
Model Test ◽  
Water Pressure ◽  
Water Inrush ◽  
High Water ◽  
Surrounding Rock ◽  
Karst Cave ◽  
Tunnel Excavation ◽  
Pressure Water ◽  
High Water Pressure

In order to explore the catastrophic evolution process for karst cave water inrush in large buried depth and high water pressure tunnels, a model test system was developed, and a similar fluid–solid coupled material was found. A model of the catastrophic evolution of water inrush was developed based on the Xiema Tunnel, and the experimental section was simulated using the finite element method. By analyzing the interaction between groundwater and the surrounding rocks during tunnel excavation, the law of occurrence of water inrush disaster was summarized. The water inrush process of a karst cave containing high-pressure water was divided into three stages: the production of a water flowing fracture, the expansion of the water flowing fracture, and the connection of the water flowing fracture. The main cause of water inrush in karst caves is the penetration and weakening of high-pressure water on the surrounding rock. This effect is becoming more and more obvious as tunnel excavation progresses. The numerical simulation results showed that the outburst prevention thickness of the surrounding rock is 4.5 m, and that of the model test result is 5 m. Thus, the results of the two methods are relatively close to each other. This work is important for studying the impact of groundwater on underground engineering, and it is of great significance to avoid water inrush in tunnels.

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