Results 221 to 230 of about 4,107 (241)

Deep-hole directional fracturing of thick hard roof for rockburst prevention

Tunnelling and Underground Space Technology, 2012
Abstract Thick hard roof in coal mines is usually a significant factor that induces dynamic disasters, such as rockburst. This study introduces a new technology called directional hydraulic fracturing characterized by cutting out an initial groove in the borehole and then injecting high pressure liquid to break the rock.
Hu He, Linming Dou, Jun Fan, Taotao Du, Xinglin Sun   +4 more
openaire   +1 more source

Field application of directional hydraulic fracturing technology for controlling thick hard roof: a case study

Arabian Journal of Geosciences, 2021
Roof management in coal mines is a critical technology challenge to realize safe production. Dynamic disasters can be induced by a sudden collapse of the roof when encountering a thick hard roof above a coal seam. To solve this problem, directional hydraulic fracturing technology was utilized in the coal mine WP with a thick hard limestone roof.
Yongxin Sun, Yukai Fu, Tao Wang
openaire   +1 more source

Model test of extreme deformation and failure mechanism of automatically formed roadway under thick-hard roof

Engineering Failure Analysis
Jingwei Gao
exaly   +2 more sources

Structural Characteristics of the Overlying Strata in a Fully Mechanized Longwall Face with the Low-Position Thick-Hard Roof

Geotechnical and Geological Engineering, 2020
Strata activity is enhanced in the condition of the thick seam and large mining height, which increases the difficulties in roof management. A detailed understanding of roof structure characteristics and its movement law is a key to control the strata behavior.
Xinshuai Shi, Hongwen Jing, Zhenlong Zhao   +2 more
openaire   +1 more source

Fractural structure of thick hard roof stratum using long beam theory and numerical modeling

Environmental Earth Sciences, 2017
The thick hard rock (THR) roof of the long-wall mining face is prone to the large-sized cantilever roof, and its sudden fracture will cause serious rock dynamic disasters, such as coal and gas outburst and rockburst. In this study, based on the long beam theory, the initial fracture mechanical model for THR was established, and the first weighting ...
Yetilmezsoy, Kaan, Zhao, Tong, Liu, Changyou, Zhang, Baisheng, Zhang, Shuai   +4 more
openaire   +2 more sources

Moment Tensor and Stress Field Inversions of Mining-Induced Seismicity in A Thick-Hard Roof Zone

Rock Mechanics and Rock Engineering, 2023
Chun-Hui Song, Cai-Ping Lu, Hai-Quan Liu, Jie-Fang Song, Cheng-Yu Liu, Hua-Wei Cui, Jin-Rui Zhang   +6 more
openaire   +1 more source

Effect of directional hydraulic fracture layouts on strata control: Insights into seismicity mitigation in thick-hard roofs

Directional hydraulic fracturing is widely applied to mitigate seismicity hazards in multilayered thick hard roof (THR) systems. To clarify the governing mechanisms and effectiveness of various fracturing layouts, a field-scale Finite Discrete Element Method model was developed with stratum-specific in-situ stress loading.
Yazhou Shen, Xiaoguang Wu, peng sanli, huang zhongwei, li gensheng, long tengda, li muzi, feng yanjun, lin penghao   +8 more
openaire   +1 more source

Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

Sustainability, 2022
Chaowen Hu, Hu Chaowen, Wang Eryu
exaly  

A New Method to Assess Thick, Hard Roof-Induced Rock Burst Risk Based on Mining Speed Effect on Key Energy Strata

Sustainability, 2022
Shihao Tu, Miao Kaijun, Jieyang Ma
exaly  

Study on the Mechanism and Prevention of Frequent Mine Seismic Events in Goaf Mining under a Multi-Layer Thick Hard Roof: A Case Study

Minerals (Basel, Switzerland), 2023
Si-Tao Zhu, Bo Wang, Jinwen Bai
exaly