Results 31 to 40 of about 4,519 (226)

Pressure Control Technology at the Hard Thick Sandstone Roof in an Island Mining Face with a Large Mining Height [PDF]

, 2020
Fracture of a critical stratum on a coal seam roof may cause strong strata pressure behaviours. In particular, a large-scale sudden fracture of the critical stratum, which is formed by hard thick sandstones on a mining face with a large mining height ...
Min Tu, Tu, Min, Fu*, Baojie, Qingchong Zhao, Baojie Fu*, Zhao, Qingchong   +5 more
core   +1 more source

Mechanical Analysis of the First Fracture Characteristics of Hard Roof of Extra-thick Coal Seam

Meikuang Anquan, 2020
In order to investigate the failure mechanisms of the hard roof in the fully mechanized caving face in the extra-thick coal seam, the mechanical analysis model of the first breaking of the hard top roof in the fully mechanized caving mining of the extra-
LIANG Shaping, LU Yinlong, GUO Peng, WU Bingzhen
doaj   +1 more source

The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application [PDF]

, 2017
In mining engineering, the thick and hard roof threatens the safe production. Based on Reissner plate theory and combined with weighted residual method, with four edges clamped as the boundary conditions, this paper deduces the theoretical formula of the
Xiaolong Li, Changwu Liu, Yang Liu, Hui Xie   +3 more
core   +1 more source

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
core   +1 more source

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

Radiative Thermal Management for Extreme Environments: Mechanisms and Design Strategies

Advanced Materials, EarlyView.
In this review, we discuss the fundamental mechanisms of radiative cooling and solar heating, material and structural design strategies, hybrid approaches integrating additional heat transfer pathways, and durability‐oriented designs addressing environmental stresses.
Hyung Rae Kim, Haeseong Kim, Joo Hwan Ko, Gil Ju Lee, Dae‐Hyeong Kim, Young Min Song   +5 more
wiley   +1 more source

Ultra‐White Elastomeric Coatings for Daytime Radiative Cooling

Advanced Materials Technologies, EarlyView.
Passive daytime radiative cooling meets elasticity in a new class of ultra‐white silicone coatings. Combining high solar reflectance with strong sky‐window emission, they hold surfaces below ambient temperature under full sunlight while remaining flexible and stretchable. This combination of cooling performance and mechanical flexibility enables energy‐
Abdulrahman Aljwirah, Xiaojie Liu, Khalid Alhammadi, Orlando G. Rivera Gonzalez, Won‐June Lee, Xiulin Ruan   +5 more
wiley   +1 more source