Notice of Retraction: Research of Dust Control Technology of Coal Seam Infusion with Long Borehole Adding Infiltration Stick

2011 ◽  
Author(s):  
Zhi-an Huang ◽  
Ying-hua Zhang ◽  
Jian-hua Gong ◽  
Li-ming Jiang ◽  
Meng-yu Huang
Keyword(s):  
Coal Seam ◽  
Dust Control ◽  
Control Technology

Research on Coupling Control Technology of Constant Resistance in Gob-side Entry Under Mined Gob of Recent Coal Seam Group

2020 ◽  
Vol 38 (5) ◽  
pp. 4685-4699
Author(s):  
Yong Zhang ◽  
Xing Xia ◽  
Xiao-ming Sun ◽  
Peng Song ◽  
Jian Wang ◽  
...  
Keyword(s):  
Coal Seam ◽  
Control Technology ◽  
Constant Resistance

scholarly journals Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

2020 ◽  
Vol 2020 ◽  
pp. 1-23
Author(s):  
Shengrong Xie ◽  
Xiaoyu Wu ◽  
Dongdong Chen ◽  
Yaohui Sun ◽  
En Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Field Distribution ◽  
Control Technology ◽  
Coal Seams ◽  
Anchor Bolt ◽  
Anchor Cable ◽  
Coal Pillars ◽  
Seam Mining ◽  
And Control

The surrounding rock of the roadway under double gobs in the lower coal seams is partially damaged by the mining of the upper coal seam and the stress superimposition of the stepped coal pillars. What is worse, the upper layer of the roof is collapse gangue in double gobs, which makes the anchor cable unable to anchor the reliable bearing layer, so the anchoring performance is weakened. The actual drawing forces of the anchor bolt and anchor cable are only approximately 50 kN and 80 kN, respectively. The roadway develops cracks and large deformations with increasing difficulty in achieving safe ventilation. In view of the above problems, taking the close coal seam mining in the Zhengwen Coal Mine as the engineering background, a theoretical calculation is used to obtain the loading of the step coal pillars and the slip line field distribution of the floor depth. The numerical simulation monitors the stress superimposition of stepped coal pillars and the distribution of elastoplastic areas to effectively evaluate the layout of mining roadways. The numerical simulation also analyzes the effective prestress field distribution of the broken roof and grouting roof anchor cable. A laboratory test was used to monitor the strength of the grouting test block of the broken coal body. Then, we proposed that grouting anchor cable be used to strengthen the weak surface of the roof and block the roof cracks. From on-site measurement, the roadway was seen to be arranged in the lateral stress stabilization area of the stepped coal pillars, the combined support technology of the grouting anchor cable (bolt) + U type steel + a single prop was adopted, the roadway deformation was small, the gas influx was reduced, and the drawing force of the anchor bolt and the anchor cable was increased to approximately 160 kN and 350 kN, respectively. The overall design and control technology of the roadway can meet the site safety and efficient production requirements.

Study and application on foam-water mist integrated dust control technology in fully mechanized excavation face

2020 ◽  
Vol 133 ◽  
pp. 41-50 ◽  
Author(s):  
Qingguo Wang ◽  
Deming Wang ◽  
Fangwei Han ◽  
Fan Yang ◽  
Yingxia Sheng
Keyword(s):  
Water Mist ◽  
Dust Control ◽  
Control Technology

The Control Technology on Continuing Displacement of Tunnel in Coal Seam with High Stress Surrounding Rocks

2011 ◽  
Vol 250-253 ◽  
pp. 1552-1555
Author(s):  
Ming Xin Lu ◽  
Zhen Guo Li ◽  
Yin Tong Tian ◽  
Ping Song ◽  
Yan Sen Huai ◽  
...  
Keyword(s):  
Residual Stress ◽  
Coal Seam ◽  
High Stress ◽  
Measurement Data ◽  
Control Technology ◽  
Support Structure ◽  
Anchor Cable ◽  
Time Control

The measurement data indicates that the main reason for tunnel damage is continuing level displacement with the characteristic of Pie Form. The experiment shows that, compared with uniaxial compressing, the residual stress in triaxiality compressing is greater, this can result that the level support can increase the stress of the surrounding rocks and decrease or stop the level displacement, at same time, control the pie form displacement of the coal. Based on the situation of tunnel displacement, semi-closing support with I bar or support structure with anchor cable are designed, which can control the continuing displacement of tunnel effectively.

Study on Technology of Fully-Mechanized Sub-Level Caving Mining Technology in the Datong Permo Carboniferous Coal Seam

2012 ◽  
Vol 616-618 ◽  
pp. 565-568
Author(s):  
Bin Yu ◽  
Jun Zhao ◽  
Hong Chun Xia
Keyword(s):  
Coal Seam ◽  
Mining Area ◽  
Hard Coal ◽  
Control Technology ◽  
Mining Technology ◽  
Hard Roof ◽  
Sublevel Caving ◽  
Seam Mining ◽  
Longwall Top Coal Caving ◽  
And Control

This thesis briefly introduced roof control technology in fully-mechanized sublevel caving mining with hard roof and hard coal seam, Mining technology , gas prevention and comprehensive prevention and control technology in spontaneous combustion of coal, which in longwall top-coal caving face with hydraulic support in thickness seam in the Datong permo carboniferous coal seam . New development directions of fully-mechanized sublevel caving mining technology in the Datong mining area in the next few years.

scholarly journals Research Status of Pathogenesis of Pneumoconiosis and Dust Control Technology in Mine—A Review

2021 ◽  
Vol 11 (21) ◽  
pp. 10313
Author(s):  
Guoming Liu ◽  
Qianqian Xu ◽  
Jipeng Zhao ◽  
Wen Nie ◽  
Qingkun Guo ◽  
...  
Keyword(s):  
Occupational Health ◽  
Prevention And Control ◽  
Dust Control ◽  
Dust Removal ◽  
Research Progress ◽  
Control Technology ◽  
Dust Suppression ◽  
Efficient Treatment ◽  
Mine Dust ◽  
And Control

Pneumoconiosis has become one of the biggest threats to the occupational health and life safety of mining workers in China. The number of pneumoconiosis cases has continued to rise in recent years. The main task of occupational health development is to study the pathogenesis of pneumoconiosis and to develop mine dust prevention and control technology. Therefore, this paper summarizes the research progress of coal worker pneumoconiosis and dust prevention and control in mines. Firstly, the research progress of coal worker pneumoconiosis is analyzed from the aspects of pathogenesis, animal model and pathological changes of coal worker pneumoconiosis. Then, the existing basic theory and technology of dust prevention are described, including ventilation and dust removal, spray and dust suppression, and chemical dust suppression methods. Finally, based on the dust removal theory of wet shotcrete, the progress of shotcrete dust control technology and equipment used for shotcrete is summarized from the aspects of shotcrete technology process and shotcrete materials. At the same time, in view of the shortcomings of the existing research, the next research prospect is given in the pathogenesis of pneumoconiosis, intelligent dust prevention, jet spraying dust removal and so on. This paper provides theoretical support for realizing the separate source and efficient treatment of mine dust control and helps to improve the clean production level of mine, control and prevent pneumoconiosis.

scholarly journals Stability Analysis and Control Technology of Gob-Side Entry Retaining with Double Roadways by Filling with High-Water Material in Gently inclined Coal Seam

2021 ◽  
Author(s):  
Shengrong Xie ◽  
En Wang ◽  
Dongdong Chen ◽  
Hui Li ◽  
Zaisheng Jiang ◽  
...  
Keyword(s):  
Coal Seam ◽  
Good Control ◽  
Active Role ◽  
Simulation Method ◽  
High Water ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Control Technology ◽  
Control Effect ◽  
Support Resistance

Abstract Roadside filling body in traditional gob-side entry retaining (GER) has several shortcomings such as the insufficient support resistance, the inability to adapt to the deformation of surrounding rock and isolate the goaf effectively. Taking the GER with double roadways by filling with 1.8-m-wide high-water material in gently inclined coal seam of Zuozegou mine as a project case, the mechanical model of GER with double roadways in the gently inclined coal seam is constructed, and the reasonable width of the filling body of GER is verified by combining with the peak strength of high-water material. The FLAC3D numerical simulation method is used to study the distribution characteristics of stress and plastic zone of GER after being affected by the mining disturbance, and the failure range of surrounding rock of GER with double roadways is obtained. Based on this, a coupling control technology named anchor cables and bolts in the roof and solid coal + single props in entry-in support and goaf side of the outer roadway + anchor bolts in roadside high-water material + short anchor cables below the filling body is proposed and conducted in industrial test. Through the coupling methods of arranging borehole peeping and observing the convergences of surrounding rock, the stability of GER with double roadways is analyzed. The results show that GER with double roadways by filling with 1.8-m-wide high-water material has good control effect. The above research has played an active role in promoting the application of high-water material in roadside filling of GER.

Sign in / Sign up

Export Citation Format

Share Document