Results 31 to 40 of about 1,626 (149)

Deep-hole blasting roof cutting technology for pressure relief in the final mining phase of the working face: a case study

Frontiers in Earth Science
In the final mining phase of the working face, a large area of suspended roof can lead to stress concentration from mining-induced stress, which in turn causes deformation and instability of the main roadway. This study takes the Ji-17-21080 working face
Baomin Liu, Dingchao Chen, Changtao Xu
doaj   +2 more sources

Lateral Structure of Multi-Layer Thick Hard Roofs and Hydraulic Roof-Cutting Pressure Relief in Xiao Jihan Mine

Applied Sciences
This study aims to address the pronounced stress concentration in roadway-surrounding rock under conditions of multiple thick and hard roof strata at Xiao jihan coal mine, China. The work was carried out on the 13216 working mining face as the engineering background.
Hui Liu, Lichuang Chen, Xufeng Wang, Hui Gao, Chenlong Qian, Xuyang Chen   +5 more
openaire   +2 more sources

Roadway Protection by Roof-Cutting in the Support Removing Channel of the Long-Wall Mining Face

Shock and Vibration, 2022
Aiming at strong mining pressure and large deformation of surrounding rock in the main roadway, a mechanical model of the advanced abutment pressure distribution in the long-wall mining face was established.
Xingyun Ren, Bingyuan Hao, Hongwei Wang, Junjie Zhao, Ji Zhang, Chen Zhang   +5 more
doaj   +2 more sources

Research on mechanism and application of compound roof cutting and pressure relief control in thick sandstone roof mining roadways

Frontiers in Earth Science
Thick sandstone roof strata exacerbate surrounding rock deformation and failure in roadways, posing a severe threat to safe and efficient coal mine production. To address the challenge of controlling surrounding rock in high-stress roadways under such conditions, a novel composite roof cutting and pressure-relief method leveraging the dilation ...
Hainan Gao, Shankun Zhao, Yue Shi, Yunpeng Li, Kun Lv, Qiang Fu, Guanghui He, Weiguang Ren, Zhibin Zhou, Lei Chen, Haonan Li   +10 more
exaly   +2 more sources

Key Parameters of Surrounding Rock Roof Cutting and Pressure Relief Control in Soft Rock Roof Roadway of Deep Mine Stope and Its Engineering Application

Lithosphere, 2022
In this study, the movement and failure law of working face overburden and the distribution characteristics of mining stress are analyzed using laboratory test and numerical calculation methods to address the problems of large deformation, failure ...
Jucai Chang, Tenggen Xiong, Chao Qi, Chuanming Li, Dongdong Pang   +4 more
doaj   +2 more sources

Analysis of the effect of cutting depth under thick immediate roof on gob-side entry retaining stability [PDF]

Gong-kuang zidonghua
The stability of gob-side entry retaining with roof cutting and pressure relief is primarily influenced by roof cutting parameters. However, determining appropriate cutting parameters for gob-side entry under the effect of a thick immediate roof is ...
WANG Fei, WANG Xuqiang, SHI Xinyu, XU Huicong   +3 more
doaj   +2 more sources

Influence of roof cutting depth on stability of gob side entry in thick coal seams with a bulky limestone roof [PDF]

Sci Rep
For the gob-side entry retained by roof cutting, the roof pre-splitting depth is directly related to its stability, especially under the condition of fully mechanized mining in 4.5 m thick coal seam underneath 13.7 m thick limestone roof.
Lin Meng, Chenlong Wang, Yijia Chai, Mei Wang, Zhengzhao Liang, Yongkang Yang, Jinming Liu   +6 more
core   +2 more sources

The influence of hard roof cutting and pressure relief technology on the deformation law of surrounding rock in roadways

Gong-kuang zidonghua
The goaf roadways have problems of high surrounding rock stress and large deformation under the conditions of hard roof and wide coal pillars in thick coal seams.
ZHAO Changxin, LI Xiaoxu, SHI Meng, JI Ruifeng, ZHANG Yan   +4 more
doaj   +2 more sources

Study on Deep Hole Blasting for Roof Cutting, Pressure Relief and Roadway Protection in Deep Multi-Coal Seam Mining

Applied Sciences
Deep multi-coal seam mining is plagued by intense mining pressure, significant impacts of multi-working face mining on system roadways, and difficult surrounding rock deformation control—these issues severely threaten the safe and normal operation of ...
Zhongyuan Ren, Mengxiang Wang
doaj   +2 more sources

Application research on roadway protection technology by hydraulic fracturing roof cutting pressure relief in underground coal mine

Gong-kuang zidonghua, 2019
The gas concentration of No.8 coal seam in north 3 panel of Duerping Coal Mine is high, the direct roof and the basic roof are both hard limestone, and it is easy to form a large area of hanging roof in the upper corner after stoping on working face ...
DONG Zhiyong
doaj   +2 more sources