Results 11 to 20 of about 4,519 (226)

Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China

Geofluids, 2021
As an extra-thick hard roof is a significant contributing factor to frequently induced sudden roof collapse accidents and coal bursts, this study investigates the relationship between extra-thick hard roof movement and mining-induced stress using ...
Hongwei Wang, Daixin Deng, Ruiming Shi, Guozhen Yang, Shuo Xu, Yaodong Jiang   +5 more
doaj   +2 more sources

Structural quantification of multi-thick hard roof and strong ground pressure control in large mining height stope: a case study

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
The mining of deep large-height longwall faces leads to frequent occurrences of strong ground pressure, at the same time, there are multi-thick hard rock strata in the roof of the longwall face, therefore, it is important to master the fracture ...
Yangbo Lu, Shaohong Yan, Kunyou Zhou, Chenxi Zhang, Yi Zhou   +4 more
doaj   +2 more sources

Evolution of broken structure of hard thick roof and analysis of impact hazard area

Meikuang Anquan
Aiming at the influence of hard and thick roof fracture and structural evolution on the impact of working face, taking the hard and thick roof condition of 63 upper 05 working face in Dongtan Coal Mine as the engineering background, the critical ...
Pengfei LYU, Xuekai CUI, Zhuang MIAO, Kangbin LU, Yijian GENG   +4 more
doaj   +2 more sources

Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China

Advances in Civil Engineering, 2018
Ultra-thick hard sandstone roofs present high thickness, poor delamination, and wide caving range. The strata pressure of the working face during actual mining increases, having a significant influence on the safe mining of the working face.
Feng Ju, Meng Xiao, Zequan He, Pai Ning, Peng Huang   +4 more
doaj   +2 more sources

Experiment Study on the Mechanical Behavior and Acoustic Emission Response of Thick and Hard Sandstone Roof in Xinjiang Mining Area

Advances in Civil Engineering
One of the primary threats to coal mine safety production is the sudden extensive fracturing and collapse of thick and hard roof strata. A range of uniaxial compression experiments with acoustic emission (AE) monitoring was performed for studying the ...
Dongdong Qin, Zechao Chang, Ze Xia
doaj   +2 more sources

Characteristics of mine pressure and roof disaster prevention and control technology on hard and thick roof of working face [PDF]

Meitan kexue jishu
Mine pressure appears extremely strong during mining in hard and thick roof working faces. The prevention and control of this type of roof disaster has always been a problem that has plagued the safe and efficient production of working faces in my ...
Gang XU, Zhen ZHANG, Zhengjie LI, Yanjun FENG, Chunhui ZHANG, Jisheng XUE, Qianjin LIU, Xingyu LIN, Rongshan MA   +8 more
doaj   +2 more sources

Fracture Instability Law of Thick Hard Direct Covering Roof and Fracturing and Releasing Promotion Technology

Applied Sciences
Because of its strong bearing capacity and large size, a thick and hard roof is the main source of strong ground pressure in a stope, and its breaking and migration mechanism and effective control are very important for realizing safe and efficient ...
Xingping Lai, Chuan Ai, Helong Gu, Hao Wang, Chong Jia   +4 more
doaj   +2 more sources

Thick-hard strata movement law and multi-dynamic load mechanism in longwall face with ultra-large cutting height [PDF]

Meitan xuebao
Large mining height technology is characterized by high yield, high efficiency, and high recovery rate. It has become the preferred technology for mining thick coal seams in Yushen mining area.
Jiachen WANG, Zhaohui WANG, Wenchao SUN, Meng LI, Xin ZHANG, Jialong LI, Dongxin HOU   +6 more
doaj   +2 more sources

Deformation and Fracture Mechanisms of Thick Hard Roofs in Upward Mining Coalfaces: A Mechanical Model and Its Validation

Applied Sciences
The safety and efficiency of underground coal mining are threatened by thick hard roofs characterized by large overhang areas, problematic spontaneous caving, and high dynamic load upon their breakage.
Wei Zhang, Linchao Cao, Dongsheng Zhang, Yang Hu, Jingyu Chang, Zhenying Zhang   +5 more
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.
Hui Liu, Lichuang Chen, Xufeng Wang, Hui Gao, Chenlong Qian, Xuyang Chen   +5 more
doaj   +2 more sources