Results 61 to 70 of about 1,488 (167)

Study on critical parameters of gob-side entry retaining by roof cutting and pressure relief in inclined coal seams

, 2023
Abstract The study explored how to improve gob side entry retaining by roof cutting in inclined coal seams with thick, inclined, and hard roofs. The research focused on optimizing key parameters through theoretical analysis, numerical simulation, and field monitoring at the 1301 headentry of Great Wall No.6 Mine. Firstly, based on the expansion
Weiping Shi, Zhaoying Li, Changtao Liu, Yanwei Lv, Haoran Zhang, Tao Yang   +5 more
openaire   +1 more source

Research on Roof Cutting and Pressure Relief Technology of Gob-side Entry Retaining with Hard Roof

Journal of Innovation and Development
Traditional coal pillar roadway protection is easy to cause roadway stress concentration, roadway deformation instability, and low recovery rate of coal resources. In order to solve the stability of roadway mining process and coal mine efficiency. Aiming at the problem of gob-side entry protection by deep hole pre-splitting blasting with hard roof ...
openaire   +1 more source

Isolation, Insularity and Resilience: A Review of the Geophysical, Socioeconomic, and Environmental Vulnerabilities of Gran Canaria and Lesvos Islands for Policy Interventions to Global Change

Sustainable Development, EarlyView.
ABSTRACT The dynamic nature of small islands being geographically isolated and their perceived connectedness with global networks complicates research attempts to draw general conclusions on whether insularity leads to marginalization or strengthens their resilience for sustainable development.
Toheeb Lekan Jolaosho, Mazen Marouani, Takwa Boughanmi   +2 more
wiley   +1 more source

National Policy Coherence Counts for Reducing Inequality in Global Climate and Development Agendas

Sustainable Development, EarlyView.
ABSTRACT International institutions promote policy coherence as crucial to the effective and fair implementation of global sustainability agendas, though the evidence for its benefits is slim. We present here the first systematic cross‐country dataset on the consequences of national government efforts to promote policy coherence for vulnerable groups ...
Katherine Browne, Adis Dzebo, Zoha Shawoo, Mario Cardenas, Pierrick Chalaye, Alexia Faus Onbargi, Cassilde Muhoza, Patricia Nicdao, Nokwethaba Makhanya, Navam Niles, Priyatma Singh   +10 more
wiley   +1 more source

Practical Methodology for Developing Visions for Carbon‐Neutral Cities and Communities

Sustainable Development, EarlyView.
ABSTRACT Cities and communities play important roles in sustainable development and climate change mitigation. This study presents a novel framework for developing carbon‐neutral visions for cities and communities. We established five “principles,” investigated options encompassing four parameters (management, goal setting, actions, and quantification),
Kei Gomi, Makoto Ooba, Shogo Nakamura, Kohei Sakai, Satoshi Nagatomi   +4 more
wiley   +1 more source

Dense boreholes for weakening bottom layer by cutting roof and pressure relief of gob-side entry retaining

Meikuang Anquan, 2022
In order to ensure the safe and smooth process of gob-side entry retaining of high stress thick coal seam bottom layer in Guhanshan Coal Mine, combined with the broken condition and gas condition of the regenerated roof, the necessity of adopting dense borehole to cut roof and relieve pressure of the gob-side entry retaining roadway at the bottom layer
LI Dongyin, ZHANG Jingxuan, ZHENG Lijun, WANG Shen, WANG Wen, HUANG Zujun   +5 more
openaire   +1 more source

Evaluation of prestress losses in concrete beams using destructive and non‐destructive methods

Structural Concrete, EarlyView.
Abstract Over the past few decades, prestressing techniques have become essential in the construction of key structures, infrastructure, and bridges. The serviceability and safety of prestressed concrete (PC) elements are closely tied to the effectiveness of the prestressing process.
A. N. Consiglio, G. Muciaccia, G. Rosati
wiley   +1 more source

Lateral Structure of Multi-Layer Thick Hard Roofs and Hydraulic Roof-Cutting Pressure Relief in Xiao Jihan Mine

Applied Sciences
This study aims to address the pronounced stress concentration in roadway-surrounding rock under conditions of multiple thick and hard roof strata at Xiao jihan coal mine, China. The work was carried out on the 13216 working mining face as the engineering background.
Hui Liu, Lichuang Chen, Xufeng Wang, Hui Gao, Chenlong Qian, Xuyang Chen   +5 more
openaire   +1 more source

New Results From the Pre‐Pottery Neolithic Site of Al Uyaynah, Tabuk, in Northwestern Saudi Arabia

Arabian Archaeology and Epigraphy, EarlyView.
ABSTRACT Al Uyaynah is a low sandstone mound on an alluvial plain, long known for its extensive surface remains of stone‐built circular and rectangular structures. Following test excavations in 2012, more detailed excavation was undertaken in 2016 within one of the largest rectangular stone structures.
Khalid Alasmari, Stephanie F. Piper, Kirsten Grothe, W. Derek Hamilton, Delphine Joly, Penny Bickle, Geoff Bailey   +6 more
wiley   +1 more source

Pressure-relief technique and its application based on seam-cutting compensation in high-stress roadway

Meitan xuebao
As the underground coal mining activities become deeper and more intensive, the ground pressure on roadway has become a significant issue hindering the safe and efficient development of coalmines.
Xingyu ZHANG, Jun YANG, Yubing GAO, Haojie XUE, Pengfei GUO, Manchao HE   +5 more
doaj   +1 more source