Results 21 to 30 of about 717 (138)

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

Geofluids, 2023
The caving characteristics of the goaf significantly impact the mining stability of the working face. The coal-forming environment of the steeply dipping coal seam is complex. After mining, the caving rock mass rolls to the lower part of the working face
Xun Liu, Shihao Tu, Hongsheng Tu, Long Tang, Jieyang Ma, Yan Li, Wenlong Li, Kaijun Miao, Hao Tian   +8 more
doaj   +1 more source

Support-surrounding rock relationship and top-coal movement laws in large dip angle fully-mechanized caving face

International Journal of Mining Science and Technology, 2018
When mining the fully-mechanized longwall caving face along strike, the unstable equipment, the low top-coal recovery ratio and the difficulty in controlling surrounding rock may occur due to large dip angle.
Hu Shaoxuan, Ma Liqiang, Guo Jinshuai, Yang Peiju   +3 more
doaj   +1 more source

Field survey on the evolution of main ground cracks under condition of forced hard roof caving in mining ultra-thick coal seams under shallow overburden

Meitan xuebao, 2023
The Yellow River Basin is an important ecological barrier and also an important coal base concentration area in China. The contradiction between ecological protection and coal mining is prominent. Under the conditions of typical shallow overburden, extra-
Pengfei WANG, Yifan NIU, Kehang CHEN, Jianli ZHANG, Mengnan GAO, Yang YU   +5 more
doaj   +1 more source

Wireless Sensing for Monitoring of Coal Gangue Mixing Based on PT Symmetry

IEEE Access, 2022
The challenge in using fully mechanized caving mining technology for thick coal seam mining is monitoring the mixing ratio of coal gangue during the top coal caving process.
Haoyan Xi, Yong Dong, Lei Zhang, Yanhong Liu, Xiaoqiang Su, Caixia Feng, Feng Zang, Lijuan Dong, Yunlong Shi   +8 more
doaj   +1 more source

Study on the Top Coal Recovery Behavior and Parameter Optimization Under Different Caving Ratios in Thick Coal Seam Mining

Processes
Longwall top coal caving is one of the most effective methods for extracting steeply inclined and ultra-thick coal seams. To investigate the influence of caving ratio (the proportion between mining height and top coal thickness) on top coal recovery behavior and ground pressure characteristics, this study employs both the Particle Flow Code (PFC ...
Jiantao Cao, Wen Zhang, Xingping Lai, Shuai Zhang, Chang Xin, Feilong Xin, Lizheng Xu   +6 more
openaire   +1 more source

An optimizing microseismic method for rock burst early warning based on mining production process

Deep Underground Science and Engineering, EarlyView.
A classification early warning method of rock burst based on hourly microseismic data is proposed, which can be combined with the on‐site production process to provide more timely warning. Abstract Microseismic (MS) events have been reported in nearly every coal mining country, which could well lead to rock burst in underground coal mines.
Zepeng Han, Linming Dou, Wu Cai, Mingbo Chi, Guojun Xi, Shuai Chen, Biao Jiao   +6 more
wiley   +1 more source

Study on Water Disaster Prevention and Control Technology under Condition of Extra-thick Coal Seam with Slicing Fullmechanized Caving Mining

E3S Web of Conferences, 2018
Some coal seams belong to cretaceous strata in the east of Inner Mongolia, China. There are obvious differences of rock characteristics and mechanical properties between Cretaceous and Carboniferous- Permian strata. The overburden failure characteristics
Li Jianghua, Lian Yuguang, Li Hongjie
doaj   +1 more source

Mechanical analysis of basic roof fracture mechanism and feature in coal mining with partial gangue backfilling

Open Geosciences, 2020
Coal mining with partial gangue backfilling (CMPGB) method has the advantages of both high filling efficiency and excellent workface capacity, which breaks through the technical bottleneck of full-section backfilling mining.
Wei Yin, Xiaomin Bai, Jingke Wu, Ran Zhang, Chao Liu, Ran Zhang, Yunxin Tang   +6 more
doaj   +1 more source

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

Deep Underground Science and Engineering, EarlyView.
Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock

Geofluids, 2021
A development of overlying strata fractures and an unknown distribution of the two zones, which results from a strong shock tendency roof short-distance coal seam group mining, are the main problems faced by Xiashijie Coal Mine.
Xingping Lai, Bowei Liu, Pengfei Shan, Feng Cui, Yun Zhang, Xudong Zhang, Rui Bai, Xuan Wu   +7 more
doaj   +1 more source