Results 41 to 50 of about 753 (208)

Automatic sealing system for goaf along gob-side entry retaining

Gong-kuang zidonghua
The existing sealing methods for goaf along gob-side entry retaining mainly focus on building sealing walls and sealing wall cracks. The construction period is long and repeated, which consumes a lot of labor costs, has a low degree of automation, and is prone to secondary damage.
NIE Baisheng, XIA Xiaofeng, ZHOU Haowen, QIN Feng   +3 more
openaire   +3 more sources

A study of the mechanical structure of the direct roof during the whole process of non-pillar gob-side entry retaining by roof cutting

Energy Exploration & Exploitation, 2020
The non-pillar entry (roadway) retained by roof cutting serves the two adjacent working faces. As compared with the conventional mining roadways, the roadway retained by roof cutting has a longer life cycle and receives more complicated influence from ...
Xiao Liu, Xinzhu Hua, Peng Yang, Zhiguo Huang   +3 more
doaj   +2 more sources

Grouting Technique for Gob‐Side Entry Retaining in Deep Mines [PDF]

Advances in Civil Engineering, 2021
The retained rib displacement accounts for roughly 80% of rib‐to‐rib convergence in gob‐side entry retaining in deep coal mines, which shows significant nonsymmetrical feature and long‐term rheological phenomenon. Affected by mining‐induced stress, cracks spread widely, and broken zones expand beyond the anchoring range.
Xianyang Yu, Zhihong Sun, Min Deng, Jinlin Xin   +3 more
openaire   +2 more sources

Stability Control of Multilayer Roof Strata in the Large Mining Height Gob-Side Entry: A Case Study

Applied Sciences
Roof separation, destabilization and collapse of multilayer roof structures are difficult to control in large mining height gob-side entries due to severe mining pressure.
Yong Chen, Yingpeng Wang, Zhengyuan Qin, Feng Yang, Vivek Agarwal   +4 more
doaj   +2 more sources

Floor Heave Control in Gob-Side Entry Retaining by Pillarless Coal Mining with Anti-Shear Pile Technology

Applied Sciences
The severe floor heave in gob-side entry retaining is the major restriction factor of the wide application of pillarless mining thin coal seams. Reinforcement and stress-relief floor heave control methods are the most promising.
Ivan Sakhno, Svitlana Sakhno, Krzysztof Skrzypkowski, Oleksandr Isaienkov, Krzysztof Zagórski, Anna Zagórska   +5 more
doaj   +2 more sources

Position-optimization on retained entry and backfilling wall in gob-side entry retaining techniques [PDF]

International Journal of Coal Science & Technology, 2015
This study investigates the stability problem of gob-side entry retaining (GER) and backfilling wall which located under the key block B. Based on the combined research of elastic–plastic mechanics, structure mechanics and modern theory of mining-induced pressure, the caving characteristic and roof structure over the GER were analyzed, and the vertical
Feng, Xiaowei, Zhang, Nong
openaire   +1 more source

Mechanical models and support technologies for retaining gob-side entry [PDF]

Proceedings of the Taishan Academic Forum - Project on Mine Disaster Prevention and Control, 2014
Aiming at gob-side entry retaining for three typical roof conditions (hard roof, medium stable roof and limestone roof), theoretical analysis, numerical simulation, laboratory test and field test were carried out. Different support mechanical models were built, and various roadside support technologies were presented.
Tongbin Zhao, Jianguo Ning, Yanchun Yin, Yunliang Tan   +3 more
openaire   +1 more source

The technology of gob-side entry retaining supported by flexible formwork wall with roof cutting and pressure relief for composite roof in deep mine

Gong-kuang zidonghua, 2021
In Lianghuai area of China, due to the influence of the large buried depth of the mine and the complicated roof conditions, when gob-side entry is retained, the roof deformation of the gob-side entry retaining is large, the coal side is easily extruded ...
SHEN Binxue1,2, ZHOU Hongfan3, ZHU Lei1,2, WU Yuyi1,2, QIU Fengqi1,2, WANG Guopu3, GUO Lin3, HUANG Jianbin1,2   +7 more
doaj   +1 more source

Asymmetric support technology for gob side entry retaining with high water material [PDF]

Acta Geodynamica et Geomaterialia, 2021
The gob side entry retaining with high water material is often used in coal mines. To study the stress evolution characteristics of surrounding rock and asymmetric support control technology of gob side entry retaining with high water material, the evolution law of stress and deformation of surrounding rock in gob side entry retaining during working ...
Qiyuan Shan, Yongli Liu, Tao Li, Zhupeng Jin   +3 more
openaire   +1 more source

Research on Control Mechanism of Surrounding Rock of Deep Gob-Side Entry Retaining [PDF]

Geofluids, 2021
To address the large deformation of the surrounding rock of deep gob-side entry retaining under high stress, lithological characteristics of the surrounding rock and failure model of support body and their evolutionary processes are analyzed through field investigation and theoretical analysis.
Jianxiong Liu, Jingke Wu, Yun Dong, Yanyan Gao, Jihua Zhang, Weizhong He, Jiarui Chen   +6 more
openaire   +2 more sources