Results 61 to 70 of about 3,345,704 (190)

Analysis of Roof Deformation Mechanism and Control Measures with Roof Cutting and Pressure Releasing in Gob-Side Entry Retaining

, 2021
The mechanical model of the basic roof fracture structure is established on the basis of key block theory to study the roof breaking mechanism of gob-side entry retaining under roof cutting and pressure relief, and the analytical formula of roof support ...
Chengxing Zhao, Yan Zhang, Kai He, Xin-Zhu Hua, Jiadi Yin, Bing-Jun Sun, Yingfu Li   +6 more
core   +1 more source

Dynamic prediction of coal and gas outburst risk based on quantitative analysis of stress–energy evolution and adaptive correction

Deep Underground Science and Engineering, EarlyView.
This study quantitatively analyzed the spatiotemporal evolution of stress redistribution ahead of the working face by integrating coal seam distribution, tectonic stress anomalies, gas pressure, and mining‐induced disturbances. An R‐value criterion for coal and gas outburst (CGO) risk assessment was established based on energy principles.
Yingjie Zhao, Xueqiu He, Dazhao Song, Liming Qiu, Minggong Guo, Jie Liu, Qiang Liu, Yi Zhu   +7 more
wiley   +1 more source

Coal Pillar Stress Weakening Technology and Application by Gob-Side Entry Driving and Hydraulic Roof Cutting in Deep Shafts Mines

, 2022
To solve the problems of serious deformation and support difficulty of deep and narrow gob-side coal pillars, an optimized hydraulic roof cutting structural model for the roof structure of narrow gob-side coal pillars in kilometer–deep shafts was ...
Zhi Zhang, Shang Yang, Jun Wang, Ruyu Yan, Guoqing Sun, Jianguo Ning, Kun Wang, Minghao Du   +7 more
core   +1 more source

Fire‐Safe Polymeric Insulation Foams for Energy‐Efficient and Low‐Carbon Buildings

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
This review systematically summarizes recent advances in fire‐safe polymeric insulation foams, emphasizing the balance among flame retardancy, thermal insulation, mechanical reliability, and long‐term durability. By linking material‐level thermophysical properties with building cooling‐energy demand and operational carbon emissions, it establishes a ...
Qinhe Guo, Jiayi Pan, Dehui Jia, Min Chen, Danni Pan, Yao Yuan, Ying Pan, Yan Zhang, Lulu Xu, Kate Nguyen, Wei Wang   +10 more
wiley   +1 more source

Large deformation control methods for roadways in thick coal seams with high mining height and hard roof

Gong-kuang zidonghua
For the control of surrounding rock in thick coal seams with high mining heights and hard roofs, the traditional roadway layouts employing coal pillars often induce strong strata behavior, resulting in large deformations, rock bursts, and other ...
WANG Shaowei, NI Xuening, XU Jingshuai, LI Yayun, WANG Yunfeng, LI Yahui   +5 more
doaj   +1 more source

Research on Roof Cutting and Pressure Relief Technology of Deep Hole Pre-cracking Blasting

International Journal of Energy
The dynamic pressure gob-side entry is affected by the whole mining process of the working face, and the cause of the large deformation is the additional stress generated during the rotary sinking process of the key block. Therefore, in order to alleviate the deformation of surrounding rock of roadway along goaf.
Jilong Qin, Peng Zhu
openaire   +1 more source

Nested Carbon Governance in Southeast Asia: Towards Just Nature‐Based Solutions?

Environmental Policy and Governance, EarlyView.
ABSTRACT Nature‐based solutions (NbS) have gained prominence as an integrated approach to addressing climate change and biodiversity loss while supporting sustainable development. Yet, their implementation across Southeast Asia remains fragmented and often contested.
Helena Varkkey, Michelle Ann Miller, David Taylor   +2 more
wiley   +1 more source

Study on roof-cutting pressure relief technology for roadways with three-directional free surfaces and full anchor-cable support

Gong-kuang zidonghua
Current studies on surrounding rock control in dynamic pressure roadways mainly focus on roadways under single- or two-directional free-surface conditions, while relatively few studies have applied the combined control technology of roof-cutting pressure
NIU Jizhan, YANG Zhanbiao, LIU Benteng, WANG Xiangyu, XIE Han, XU Changtao   +5 more
doaj   +1 more source

Research on Crack Propagation and Stress Propagation in Coal‐Rock Combinations Under Different In Situ Stresses Subjected to Blasting Loads

Energy Science &Engineering, EarlyView.
A stress wave propagation model for coal‐rock combinations under in situ stress was established. Taking a coal mine in Huainan, China as the engineering background, isotropic and anisotropic numerical models were constructed. Field engineering practices were carried out to verify the reliability of the conclusions.
Jianyu Zhang, Guangming Chen, Meiyao Li, Xinyu Wang, Yuting Liu, Renjie Cui, Yixin Gong   +6 more
wiley   +1 more source

Influence of roof cutting parameters on stability of surrounding rock of gob-side entry retaining

矿业科学学报, 2022
As one of the core issues of roof cutting pressure relief gob-side entry retaining technology, roof cutting parameters have a great influence on the stability of surrounding rock.Taking the 1226 working face of Shuguang Mine as the engineering background,
Sheng Fengtian, Zhang Yong, Wei Wensheng, Duan Yuqing, Mao Kaibin   +4 more
doaj   +1 more source