Results 91 to 100 of about 10,848,381 (289)

Research and application of pre-stressed continuous surrounding rock control technology

Meikuang Anquan, 2021
Pre-stressed continuous surrounding rock control technology was proposed to solve the problem of serious deformation and destruction of the return air lane of No. 5 working face of Ⅱ2-1 coal in Lingdong Mine. First of all, the mechanical model of the anchor bolt pre-stress transfer in the surrounding rock was established through theoretical analysis ...
WAN Feng, WANG Zhanling, ZHANG Hongqing, FAN Mingjian, YAN Shouqing, GUO Gangye   +5 more
openaire   +1 more source

Remembrance and Reconciliation: Understanding the Little Rock Crisis of 1957 video recordings, 1997

, 1997
Collection contains nine videocassette tapes recording the public symposium, "Remembrance and Reconciliation: Understanding the Little Rock Crisis of 1957," held on 1997 September 26-27, at the University of Arkansas at Little Rock. Participants included:
University of Arkansas at Little Rock.
core  

Electrolyte Engineering Challenges and Opportunities for Next‐Generation Aqueous Ammonium‐Ion Batteries

Advanced Materials, EarlyView.
Aqueous ammonium‐ion batteries (AAIBs) face a hydrogen‐bond paradox: the HB network enables fast NH4+ transport but triggers water decomposition. This review dissects this dilemma, evaluates multiple electrolyte engineering strategies, and outlines four future directions for next‐generation AAIB design ABSTRACT Aqueous ammonium‐ion batteries (AAIBs ...
Zi‐Hang Huang, Xiaoyu Liu, Shuai Mao, Lingfeng Zhu, Zhijun Wu, Hongge Pan, Tianyi Ma   +6 more
wiley   +1 more source

Monitoring-Based Assessment of Deformation Behavior and Support Effectiveness in a Deep Hard Rock Drift

Applied Sciences
To reveal the real deformation behavior and control mechanism of surrounding rock in hard rock drifts under deep high-stress conditions, a systematic study was conducted involving engineering geological investigation, in situ monitoring of surrounding ...
Shaolong Qin, Xingdong Zhao, Jingyi Song, Shuzhao Ma, Fan Wang, Chenxi Wang, Yingjie Wang   +6 more
doaj   +1 more source

Tunnel Surrounding Rock Deformation Characteristics and Control in Deep Coal Mining

Geomaterials, 2013
In order to study the failure characteristics and control method of deep tunnel surrounding rock, based on the stress test, the structure and stress state of the main transportation tunnel surrounding rock in Mine Zhaogezhuang level 14 was analyzed, and it shows that the surrounding rock is exposed to an interphase hard and soft disadvantageous ...
Zhiqiang Zhao, Housheng Jia, Bo Peng, Yangyang Dong   +3 more
openaire   +2 more sources

Failure Mode of Deep-Buried Rectangular Chamber and Upper Bound Solution of Surrounding Rock Pressure

In order to obtain more reasonable failure modes and more precise surrounding rock pressures of deep-buried underground rectangular chambers, the failure mode of a “wedge-shaped collapse body + arc rotator + logarithmic spiral rotator” deep ...
Qi Li, Chang Liu, Xiaochuan Yu, Anming Jiang, Daobing Zhang, Yongxiang Yang, Linhai Zeng, Zhilin Lv, Xianyong Jiang   +8 more
core   +1 more source

Instability Mechanism and Control Method of Surrounding Rock of Water-Rich Roadway Roof

, 2022
Surrounding rock properties and occurrence stability of a coal seam roof are prerequisites for ensuring the safe and efficient operation of mines. In this study, the mechanisms and control of weakened water-rich roadway roof slabs were investigated ...
Haitao Li, Guiwei Zhu, Chengle Wu, Qiangling Yao, Yinghu Li, Xuehua Li, Shengyan Chen, Furong Wang   +7 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

Double-Layer Flexible Thick Anchor Technology for Surrounding Rock Control During Gob-Side Entry Driving in Deep Coal Seam Mining with Large Heights

Applied Sciences
To address the challenge of surrounding rock control in deep gob-side entry driving, the return airway of the 20203 working face of the Dahaize Coal Mine was taken as the engineering background.
Jianbing Zhao, Zhengrong Wang, Peng Li, Changliang Han, Yupeng Li, Guanghao Wang, Tiantian Hui   +6 more
doaj   +1 more source

Deformation Control Technology for Surrounding Rock in Soft Rock Roadways of Deep Kilometer-Scale Mining Wells

Symmetry
Deep soft rock roadways at about 1 km depth experience significant deformation due to concentrated stress ahead of the working face and dynamic loads from the hard roof layer. We propose an integrated control method that couples directional roof cutting, which interrupts stress transfer with constant resistance, and large deformation cable ...
Li Jiang, Haipeng Li, Lei Ma, Weiming Guan, Haosen Wang, Haochen Feng, Bei Zhang, Rui Wang 0152   +7 more
openaire   +2 more sources