Results 51 to 60 of about 1,717 (280)

Formation mechanism and height calculation of the caved zone and water-conducting fracture zone in solid backfill mining [PDF]

International Journal of Coal Science & Technology, 2020
AbstractTo study the heights of the caved zone and water-conducting fracture zone in backfill mining, the failure mechanism of strata during backfill mining was analyzed, and a method for determining the heights of the two zones was proposed based on key strata theory.
Lei Li, Fengming Li, Yong Zhang, Daming Yang, Xue Liu   +4 more
openaire   +2 more sources

Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving

矿业科学学报
The height of water-conducting fractured zone is an important indicator for ensuring safe mining of coal resources under water bodies. In view of the problems and deficiencies to quote empirical formula for top coal caving in thick coal seams, the basis ...
CUI Ximin, CHE Yuhang, SUN Shuaihui, LI Peixian, SUN Hao, XU Zhihua, YUAN Debao, JIANG Jinbao, ZHAO Yuling, MALINOWSKA A   +9 more
doaj   +1 more source

What drives animal responses to high severity fire? The role of functional traits

Biological Reviews, EarlyView.
ABSTRACT Fire regimes are changing worldwide, with increases in the frequency, extent, and severity of fires posing growing risks to biodiversity. Fire severity – the degree of habitat alteration following fire – strongly influences both immediate survival and long‐term recovery of fauna.
Grace A. Vielleux, Trent D. Penman, Victoria A. Reynolds, Matthew H. Swan   +3 more
wiley   +1 more source

A new cross‐borehole hydraulic caving technique in the coal seam with a soft layer for preventing coal and gas outbursts during coal roadway excavation

Energy Science & Engineering, 2020
Predrainage of gas by cross‐boreholes is an important method to prevent coal and gas outbursts in the process of a coal roadway excavation. Limitations of technologies and poor effects of preventing coal and gas outbursts occur in the coal seam with a ...
Binbin Qin, Guoying Wei, Zhen Lou, Zehua Wang, Fulian He, Wenrui He, Hengzhong Zhu   +6 more
doaj   +1 more source

The Principle and Practice of Strong Mine Pressure Control in the Initial Mining and Caving Stages under Multiple Key Strata

, 2022
The mechanism of strong mine pressure control in the initial mining and caving stages under multiple key strata (MKS) was studied by theoretical analysis, numerical simulation and field measurement in order to avoid the dynamic pressure accidents caused ...
Kaijun Miao, Defu Zhu, Long Tang, Shihao Tu, Hongsheng Tu, Xuewen Liu, Dapeng Wang, Wenlong Li   +7 more
core   +1 more source

Do High Temperatures Affect Firm Demography? Evidence From Italy

Business Strategy and the Environment, EarlyView.
ABSTRACT This study analyses the impact of high temperatures and heat stress on Italian firm demography during 2009–2022. Combining provincial‐firm‐level data with a high‐resolution multidecadal meteorological dataset, we investigate whether high temperatures—absolute and anomalous—affect firm entry and exit rates.
Concetta Carnevale, Danilo Drago, Francesco Trivieri, Francesco De Simone   +3 more
wiley   +1 more source

Deformation mechanism and control technology of large section gateway with top coal in coal mine

矿业科学学报, 2017
In order to solve the support problem of large section gateway with top coal in coal mine, the 7105 working face haulage gateway in Wangzhuang coal mine was taken as engineering example, large section top-coal roadway plastic zone form, displacement and ...
Peng Yanghao, Yang Jie, Cheng Jinguo, Gao Lei   +3 more
doaj   +1 more source

Prediction of the height of caving zone above the undercut in block caving mining method

Rock Mechanics Letters
The block caving is one of the most commonly used methods in underground mining of massive, low/high grades, and deep deposits. As a result of undercutting, caving occurs and propagates toward the upper part of the ore block. It is essential to predict the height of caved ore and its volume based on shape of the caved zone to make an economic decision.
Behnam Alipenhani, Abbas Majdi, Hassan Bakhshandeh Amnieh, Erfan Amini   +3 more
openaire   +1 more source

Voices From the Coast: Stakeholder Participation and Perception on Creating a Marine Protected Area

Business Strategy and the Environment, EarlyView.
ABSTRACT This study explores participatory processes in the context of marine conservation, with a specific focus on recent initiatives undertaken by the Apulia region in Italy to establish a new Marine Protected Area (MPA). Employing a qualitative cross‐sectional methodology, the study investigates how local communities perceive and engage with the ...
Giampiero Palazzo, Giuseppe Valenza, Massimo Zuccaro, Simone Pizzi   +3 more
wiley   +1 more source

Cutting-Caving Ratio Optimization of Fully Mechanized Caving Mining with Large Mining Height of Extremely Thick Coal Seam

, 2019
Serious rib spalling and low recovery rate problems caused by the poor top-coal caving property (TCCP) were investigated in fully mechanized caving mining with large mining height (FMCMLMH) of extremely thick coal seam.
Zhao, Tong, Kaan Yetilmezsoy, Zhang, Xiaoqiang, Tong Zhao, Xiaoqiang Zhang, Wang, Kai, Kai Wang, YETİLMEZSOY, Kaan   +7 more
core   +1 more source