Structural characteristics and formation mechanisms of Bayanhushu Sag in Hailar Basin, north‐east China: A study based on structural physical simulation

2021 ◽  
Author(s):  
Heng‐Lin Liu ◽  
Zhong‐Quan Li ◽  
Yang Peng ◽  
Qi‐An Meng ◽  
Gen Li ◽  
...  
Keyword(s):  
Physical Simulation ◽  
Structural Characteristics ◽  
East China ◽  
Formation Mechanisms ◽  
North East ◽  
Hailar Basin

scholarly journals Controlling mine pressure by subjecting high-level hard rock strata to ground fracturing

2021 ◽  
Author(s):  
Rui Gao ◽  
Tiejun Kuang ◽  
Yanqun Zhang ◽  
Wenyang Zhang ◽  
Chunyang Quan
Keyword(s):  
Energy Release ◽  
Physical Simulation ◽  
Hard Rock ◽  
Structural Characteristics ◽  
Effective Control ◽  
Mine Pressure ◽  
Control Effect ◽  
Propagation Length ◽  
Ground Pressure ◽  
High Level

AbstractWhen mining extra-thick coal seams, the main cause of strong ground pressure are the high-level thick and hard strata, but as yet there is no active and effective control technology. This paper proposes the method of subjecting hard roofs to ground fracturing, and physical simulation is used to study the control effect of ground fracturing on the strata structure and energy release. The results show that ground fracturing changes the structural characteristics of the strata and reduces the energy release intensity and the spatial extent of overburden movement, thereby exerting significant control on the ground pressure. The Datong mining area in China is selected as the engineering background. An engineering test was conducted on site by ground horizontal well fracturing, and a 20-m-thick hard rock layer located 110 m vertically above the coal seam was targeted as the fracturing layer. On-site microseismic monitoring shows that the crack propagation length is up to 216 m and the height is up to 50 m. On-site mine pressure monitoring shows that (1) the roadway deformation is reduced to 100 mm, (2) the periodic weighting characteristics of the hydraulic supports are not obvious, and (3) the ground pressure in the working face is controlled significantly, thereby showing that the ground fracturing is successful. Ground fracturing changed the breaking characteristics of the high-level hard strata, thereby helping to ameliorate the stress concentration in the stope and providing an effective control approach for hard rock.

scholarly journals Wuyunanthus gen. nov., a flower of Celastraceae from the Palaeocene of north-east China

2001 ◽  
Vol 136 (3) ◽  
pp. 323-327
Author(s):  
YU-FEI WANG ◽  
CHENG-SEN LI ◽  
ZHEN-YU LI ◽  
DE-ZHI FU
Keyword(s):  
East China ◽  
North East

scholarly journals Nuclear DNA Microsatellites Reveal Genetic Variation but a Lack of Phylogeographical Structure in an Endangered Species, Fraxinus mandshurica, Across North-east China

2008 ◽  
Vol 102 (2) ◽  
pp. 195-205 ◽  
Author(s):  
Li-Jiang Hu ◽  
Kentaro Uchiyama ◽  
Hai-Long Shen ◽  
Yoko Saito ◽  
Yoshiaki Tsuda ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Endangered Species ◽  
Nuclear Dna ◽  
East China ◽  
Fraxinus Mandshurica ◽  
Dna Microsatellites ◽  
North East
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