Results 261 to 270 of about 399,174 (293)

Coal seam hard roof deep hole blasting relief technology and optimization

2011 Second International Conference on Mechanic Automation and Control Engineering, 2011
Blasting pressure release of roof deep hole in the fully-mechanized face interconnection can shorten the first collapse step distance of roof, to avoid rock burst disasters that may caused a large area of roof collapse. Based on the actual geological condition of 6303 working face interconnection in Jining No.3 Coal Mine, from the rock blasting ...
Shuanghui Li, Xuehua Chen
openaire   +1 more source

Analysis and design of an underground hard rock voussoir beam roof

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1996
Abstract The behaviour of a voussoir hard rock beam roof is investigated by considering it to act as a symmetric flat arch with cracks at the abutments and at midspan. Analytical formulae are derived initially that evaluate, for any given geometry, loading and mechanical parameters of the beam, its deflection and strain within it in terms of the ...
openaire   +2 more sources

Study on Characteristics of Energy for Hard Roof Fracture in Island Workface

Advanced Materials Research, 2013
According to the characteristics of the island workface with hard roof, various mechanical models of hard roof in island workface are established, to analyze energy characteristics of hard roof before and after the first fracture in island workface with all round gobs, derived their simplified formulas of bending strain energy for hard roof before and ...
Xu Feng Pang, Ke Xue Zhang
openaire   +1 more source

Study on Hydraulic Fracture Propagation in Hard Roof Under Abutment Pressure

Rock Mechanics and Rock Engineering, 2022
Feiteng Zhang, Xiangyu Wang, Jianbiao Bai, Bowen Wu, Guanghui Wang, Junchen Li, Dingchao Chen   +6 more
openaire   +1 more source

Hard Roof’s 3D Breaking Characteristics for Longwall Faces Mined via Roof-Cutting Technology with a Chainsaw Arm Machine

Rock Mechanics and Rock Engineering, 2023
Yang Tai, Tiejun Kuang, Bin Yu, Yong Li, Wenyang Zhang, Xiangbing Meng   +5 more
openaire   +1 more source

STABILITY OF UNDERGROUND STRATIFIED HARD ROCK ROOFS

1998
A. I. SOFIANOS, A. P. KAPENIS
openaire   +1 more source

Numerical Study of the Mechanism of Dense Drillings for Weakening Hard Roofs and its Application in Roof Cutting

Rock Mechanics and Rock Engineering, 2023
Ze Xia, Qiangling Yao, Chuanjin Tang, Zhaohui Chong, Qiang Xu, Junqiang Ma, Zichang Liu   +6 more
openaire   +1 more source

Ground Control Method of Using Roof Cutting Pressure Release and Energy-Absorbing Reinforcement for Roadway with Extra-Thick Hard Roof

Rock Mechanics and Rock Engineering, 2023
Bei Jiang
exaly  

Fracture damage characteristics of hard roof with different bedding angles induced by modified soundless cracking agents

Engineering Fracture Mechanics, 2023
Jizhao Xu
exaly  

Ground response and failure mechanism of gob-side entry by roof cutting with hard main roof

Journal of Central South University
Heng-zhong Zhu, Lei Xu, Zhi-jie Wen
openaire   +1 more source