Results 31 to 40 of about 664 (89)

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

, 2023
Underground mining in coal mines causes strong disturbance to geological structures and releases a large amount of elastic strain energy. When the roof is a hard and thick rock layer, it is easy to cause dynamic disasters such as rock burst.
Huiming Yang, Haitao Sun, Rifu Li, Linchao Dai, Yi Zhang, Zhigang Zhang, Yanbao Liu   +6 more
core   +1 more source

Migration characteristics and disaster reduction and erosion prevention mechanism of thick and hard roof in deep filling mining

Meitan kexue jishu
To address the issue of rock burst disasters induced by the fracture of thick-hard roof strata, focuses on deep thick and hard roof. By integrating theoretical analysis, engineering experiments, and field monitoring, the fracture characteristics of thick-
Erhu BAI, Ranlie WANG, Wenbing GUO, Yi TAN, Hui LI, Xueyi LI, Sulin CHENG   +6 more
doaj   +1 more source

Analysis of coal pillar rock burst appearance in multi-seam mining with thick and hard roof

, 2022
The existing research only analyzes the rock burst appearance characteristics under specific conditions, lacks research on the rock burst appearance induced by coal pillar under the condition of thick and hard roof. In order to solve this problem, taking
ZHOU Chao, ZHONG Taoping, LI Zhenlei, LI Hongping, LAN Shirui, SONG Dazhao, YANG Wei, ZHANG Chuanjiu   +7 more
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Collaborative application of directional blasting presplitting and flexible formwork concrete wall technologies in Chengzhuang Coal Mine

Meikuang Anquan, 2022
In order to improve the recovery rate of coal resources in general, Chengzhuang Coal Mine has carried out and implemented the technology of gob-side entry retaining in 5309 large height mining face.
SI Xiaopeng, ZHOU Changtai
doaj   +1 more source

An Innovative Approach for Gob-Side Entry Retaining With Thick and Hard Roof: A Case Study [PDF]

, 2018
An innovative roadway layout in a Chinese colliery based on gob-side entry retaining (GER) with thick and hard roof (THR) was introduced. Suspended roof is left with a large area in GER with THR, which leads to large area roof weighting (LARW).
Weijun Wang, Zhang, Zizheng, Bai, Jianbiao, Hai Wu, Shengpeng Hao, Zizheng Zhang, Wang, Weijun, Li, Shuqing, Hao, Shengpeng, Yu, Xianyang, Shuqing Li, Xianyang Yu, Wu, Hai, Jianbiao Bai   +13 more
core   +1 more source

Theory and technical system of control of far-near field hard roofs from ground and underground in a large space stope

Meitan xuebao, 2023
The stope space, after mining an extra-thick coal seam with hard roofs, is large, and its law of mining pressure is complex. The mechanism of strong mine pressure action for this stope is unclear, and there is a lack of multi-point control technology ...
Bin YU, Yang TAI, Tiejun KUANG, Rui GAO, Jingxuan YANG, Binwei XIA, Weibing ZHU, Yong LI   +7 more
doaj   +1 more source

System and application of regional fracking of coal seam roof on and under the ground to prevent rockburst

Meitan kexue jishu, 2023
To solve the problems of small local relief range, low continuity and high operational risk of rockburst, regional hydro-fracking and burst prevention system and engineering application research were carried out within thick and hard roof of a coal seam ...
PAN Junfeng, LU Chuang, MA Xiaohui, XIA Yongxue, XIE Fei, XU Gang, DOU Guidong, LYU Dazhao, SUN Xiaodong, MA Wentao   +9 more
doaj   +1 more source

Evolution of roof treatment processes from blasting to hydraulic fracturing to prevent rockburst in thick-hard roof coal mines in Xinjiang, China

Frontiers in Earth Science
Rockburst prevention poses a major challenge in coal mining, with thick and hard roof strata being the primary cause of rockbursts. To analyze the feasibility and effectiveness of using hydraulic fracturing as an alternative to blasting methods for ...
Kunlun Liu, Taotao Du, Taotao Du, Yuhai Wu, Hongping Li, Xu Yang, Jiang Liu, Hongbao Liang, Jianqi Wang   +8 more
doaj   +1 more source

Rock burst mechanism induced by stress anomaly in roof thickness variation zone: a case study

Geomatics, Natural Hazards & Risk, 2022
The variation of hard roof thickness is an essential contributor in triggering rock bursts during longwall mining. Case analysis and numerical modeling were used to study the stress and energy characteristics of the coal and rock mass and its fracture ...
Xianxi Bai, Anye Cao, Wu Cai, Yingyuan Wen, Yaoqi Liu, Songwei Wang, Xuwei Li   +6 more
doaj   +1 more source

Dynamic failure and stability model analysis of thick and hard rock with wedge-structure immediate roof occurrence

, 2021
To eliminate roof-control disasters typicallyencountering in mines with thick and hard rock strata, fracturecharacteristics, instability mechanism and prevention methods were investigatedin the study.
Zhao, Tong, Gong, Peilin, Liu, Changyou, Bahramian, Majid, Yetilmezsoy, Kaan   +4 more
core   +1 more source