Results 241 to 250 of about 338,284 (271)

Enhanced Subsurface Subsidence Prediction Model Incorporating Key Strata Theory

Mining, Metallurgy & Exploration, 2021
Subsurface strata movements and deformations associated with longwall mining operations in underground coal mines could cause various disturbances to subsurface mine structures, ground water bodies, and coalbed methane reservoirs. In order to assess those disturbances correctly and to design effective and efficient mitigation measures, it is necessary ...
Jian Yang, Yi Luo
openaire   +3 more sources

Structural characteristics of key strata and strata behaviour of a fully mechanized longwall face with 7.0m height chocks

International Journal of Rock Mechanics and Mining Sciences, 2013
Abstract Strata behaviour during the operation of super great mining height (SGMH) longwall face is different from that of normal mining height due to the extra large boundary of caved roof strata. The key to control the strata behaviour is to understand the structural characteristics of key strata (KS) and its movement law. Through field observation,
Jinfeng Ju, Jialin Xu
openaire   +3 more sources

Key strata characteristics controlling the integrity of deep wells in longwall mining areas

International Journal of Coal Geology, 2017
Abstract The damage of vertical oil/gas wells in longwall mining areas is mainly a result of strata movement induced by coal extraction. Strata with contrasting lithology vary dramatically in their movement and potential for well damage, with some special combinations of strata in particular having the greatest potential for damage.
Shun Liang, Derek Elsworth, Xuehua Li, Xuehai Fu, Boyang Sun, Qiangling Yao   +5 more
openaire   +3 more sources

The impact of key strata movement on ground pressure behaviour in the Datong coalfield

International Journal of Rock Mechanics and Mining Sciences, 2019
Abstract In-situ investigations are the most direct and authentic approach for determining the law of strata movement. In this study, in-situ investigation was carried out to determine the law of fracture and movement of a key stratum. Four-point surface extensometer (FPSE) inside overlying strata and borehole camera observation were used in the ...
Tiejun Kuang, Zhu Li, Weibing Zhu, Jianlin Xie, Jinfeng Ju, Jinrong Liu, Jingmin Xu   +6 more
openaire   +3 more sources

Analysis of the Impact of Key Strata Failure on Overlying Strata and Surface Transport Patterns

Engineering Failure Analysis
Long Chen, Dezhong Kong, Li Li, Qinzhi Liu, Pengfei Zhang, Lin Zhang, Zuo Yujun   +6 more
openaire   +3 more sources

Predicting Underground Strata Movements Model with Considering Key Strata Effects

Geotechnical and Geological Engineering, 2017
Longwall coal mining causes a large scale of subsidence in both overlying strata and ground surface. No matter where subsidence or deformation happened, its damaging effects to underground mining work or surface infrastructures are not anticipated. To accurately predict surface subsidence over the mining area, surface subsidence prediction models based
Jianwei Cheng, Gang Zhao, Siyuan Li
openaire   +1 more source

Discrimination conditions and process of water-resistant key strata

Mining Science and Technology (China), 2010
Abstract Water-preservation mining is one of the most important parts of the ‘Green Mining’ technology system, which can realize the effective regulation of groundwater resources by controlling strata movement, changing passive prevention and governance of water disasters to active conservation and utilization of groundwater resources and thus ...
Lianguo WANG, Xiexing MIAO, Yu WU, Jian SUN, Hongbo YANG   +4 more
openaire   +1 more source

Analysis on Key Strata’s Subsidence in Paste-Like Filling Face

Advanced Materials Research, 2012
Using theoretical analysis and actually test research to analyze stress condition of filling body and average subsidence of the key strata, analysis shows that the average vertical stress in filling body was about 15Mpa when entering into stable state, which is equal to the primary stress, 13.75Mpa.
Jian Hao, Yong Kui Shi, Kuan Liu
openaire   +1 more source

Mechanical model of control of key strata in deep mining

Mining Science and Technology (China), 2011
Based on the characteristic of deep rock layers and the theory of key strata, we analysed elastic mechanical characteristics of key strata by using elastic plate theory. The results show that the deformation and distribution of internal forces of key strata vary with different mine boundary conditions. The boundary values of key strata with three point
Pu Hai, Zhang Jian
openaire   +1 more source