scholarly journals Stability Analysis and Control Measures of Large-Span Open-Off Cut with Argillaceous Cemented Sandstone Layered Roof

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wenxiang Zheng ◽  
Yujie Guo ◽  
Guojun Zhi ◽  
Xiankai Bao ◽  
Ming Sun ◽  
...  
Keyword(s):  
Control Measures ◽  
Structure Model ◽  
Theory Analysis ◽  
Beam Structure ◽  
Large Span ◽  
Roof Caving ◽  
Working Face ◽  
Field Practice ◽  
Weak Interlayer ◽  
And Control

This paper is based on the condition where layered argillaceous cemented sandstone as an engineering background is met by the No. 207 fully mechanized working face open-off cut (Wanli No. 1 Coal Mine). Through mechanical theory analysis and field practice, the engineering safety problem of the large-span argillaceous cemented sandstone layered open-off cut roof supporting structure was analyzed. The roof caving arch height of the open-off cut roadway in 207 working face was obtained based on the mechanical mechanism of instability and caving of the layered surrounding rock mass roof. The anchor cable suspension and bearing stability of the open-off cut roof were analyzed in terms of the layered beam structure model. Meanwhile, combining with conditions, reasonable and effective support countermeasures and key parameters are proposed for such open-off cut roadway and enhance the actual supporting engineering on-site. These research results could provide engineering reference for an open-off cut roadway with composite roof conditions featured to weak cementation and weak interlayer.

Logical Structure Analysis of Intelligent Measurement and Control System Basic on Personification Theory

2012 ◽  
Vol 542-543 ◽  
pp. 972-975
Author(s):  
Xiao Dong Liu ◽  
Ya Rong Li ◽  
Bao Qing Yang
Keyword(s):  
Control System ◽  
Logical Structure ◽  
Structure Model ◽  
Theory Analysis ◽  
Measurement And Control System ◽  
Intelligent Measurement ◽  
General Abstract ◽  
And Control ◽  
Measurement And Control ◽  
The Relationship

To analyze the intelligent measurement and control system in real world theoretically and overcome the disadvantages, where the high-general and abstract models are lacking for the analysis, guidance and description, a structure model was proposed based on personification theory. In this model, several major functional units of system were extracted using human body system as the analysis prototype. And three aspects of U(structural unit set), S(service set) and R(the relationship set) were discussed. The theory analysis suggests that this model has general, abstract, analyzable and guidable characteristic for analyzing intelligent measurement and control system.

scholarly journals Research on Mechanism of Rock Burst in Key Working Faces under Thick Magmatite in Deep Mine

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
WeiLi Yang ◽  
ZhiZeng Zhang ◽  
QuanDe Wei ◽  
XiaoCheng Qu ◽  
JingLin Wen
Keyword(s):  
Rock Burst ◽  
Control Measures ◽  
Mine Pressure ◽  
Shock Bump ◽  
Deep Mine ◽  
Speed Reduction ◽  
Working Face ◽  
Mining Safety ◽  
Prevention And Control Measures ◽  
And Control

The rock burst of key working faces under the thick hard rock in deep mine significantly threatens the mining safety of deep mine. In this study, the key working faces under typical deeply buried thick magmatite were adopted as the engineering background. The mine pressure characteristics during the mining in key working faces under thick magmatite in deep mine were measured and analyzed. Then, the evolution of overburden strata structure under the control of thick magmatite was explored based on the theory of mine pressure to conclude that the horizontal “carrier” load of broken rock beam, the vertical “loader” load, and the shock bump load from thick magmatite fracture are main sources of force behind the burst. Finally, the mechanism of rock burst was studied on the basis of the balanced relationship between loading and bearing. According to the results of research, the burst in key working faces under thick magmatite in deep mine was actually the instability burst of the key working face block. The bearing capacity and load of key working face block were constantly changing during the unstable movement of thick magmatite. The rock burst would occur in the event of any instability during the dynamic confrontation of “loading-bearing”. As per different burst sources, it could be divided into flexural loading burst of thick magmatite and shock bump burst of thick magmatite fracture. The mechanical conditions for each of the two bursts and the width calculation formula for the key working face free from overall instability burst were deduced. The research results were applied to key working face 12310. Meanwhile, the purpose of safe production following the principle of “No disaster in bumps, no harm under burst” was realized by implementing the “Four Keys” comprehensive prevention and control measures of “key monitoring + key speed reduction + key pressure relief + key support”.

Study of Stope Structure Model and Parameters

2013 ◽  
Vol 373-375 ◽  
pp. 2191-2194
Author(s):  
Jia Zhuo Li ◽  
Chuan Ming Li ◽  
Hai Feng Ma ◽  
Wen Bao Shi ◽  
Xin Gang Niu
Keyword(s):  
Compressive Strength ◽  
Overburden Rock ◽  
Structure Model ◽  
Roof Caving ◽  
Working Face ◽  
Immediate Roof ◽  
Coal Rock ◽  
Rock Model ◽  
Step Distance ◽  
Rock Beam

Based on theoretical analysis and computational mechanics, the spatial structure of overburden rock model of 1704 working face in a coal mine, stratum quality membership of uniaxial compressive strength, layer thickness, joint cracks were analyzed. Stope model was established, immediate roof caving step distance is calculated, fracturing length and structural composition of rock beam were calculated, which may have important implications for The failure mechanism of instability of coal rock.

The Mine Pressure Management and Control Fully-Mechanized Coal Working Face Roof and Floor of Soft Strata

2014 ◽  
Vol 962-965 ◽  
pp. 1123-1126 ◽  
Author(s):  
Ru Bin Liu ◽  
Hai Yun Zhang
Keyword(s):  
Coal Seam ◽  
Pressure Control ◽  
Control Measures ◽  
Mine Pressure ◽  
Pressure Management ◽  
Working Face ◽  
Production Practice ◽  
And Control

The “three volume” and the characteristics of deformation and damage of coal seam were observed and analyzed, the appropriate mine pressure control measures were proposed and put into production practice.

Formation Mechanism and Control Measures of Sliding Surface about Bedding Slope Containing Weak Interlayer

2020 ◽  
Vol 24 (8) ◽  
pp. 2372-2381
Author(s):  
Tao Wang ◽  
Hongbao Zhao ◽  
Yihong Liu ◽  
Shaoqiang Liu ◽  
Rui Liu
Keyword(s):  
Formation Mechanism ◽  
Control Measures ◽  
Sliding Surface ◽  
Weak Interlayer ◽  
And Control ◽  
Bedding Slope

scholarly journals Recognition and Prevention of Bed Separation Water: Based on Trapezoid Platform Model

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ru Hu ◽  
Jiwen Wu ◽  
Xiaorong Zhai ◽  
Wei Liu
Keyword(s):  
Plate Theory ◽  
Water Inrush ◽  
Control Measures ◽  
Key Strata ◽  
Working Face ◽  
Bed Separation ◽  
Prevention And Control Measures ◽  
Evolutional Process ◽  
And Control ◽  
Overlying Strata

In recent years, bed separation water inrush, as a new type of water disaster, has posed serious threat to mining safety in China’s many coal mines. This study focused on periodic water inrush accidents in the No. 7335 working face owned by Xuzhuang Coal Mine, Jiangsu Province, China. Based on the theory of key strata, the formation positions of the separation layer in the overlying strata were first identified; next, the trapezoid platform model of the fracture of the overlying strata was introduced for illustrating the evolutional process of the bed separation space and accurately calculating the position and the geometrical morphology of the bed separation space. On that basis, the relation between the fracture of the overlying stratum and the inrush of bed separation water was revealed with the use of the plate theory. Moreover, the prevention and control measures of the bed separation water were formulated. Research show that the arrangement of the diversion drilling holes can successfully eliminate the threat of the bed separation water to the lower working face.

Knowledge and Awareness of Dengue Fever

2018 ◽  
pp. 219-222
Author(s):  
Y. Arockia Suganthi ◽  
Chitra K. ◽  
J. Magelin Mary
Keyword(s):  
Dengue Fever ◽  
Prevention And Control ◽  
Control Measures ◽  
Infection Transmission ◽  
Standard Guideline ◽  
The World ◽  
Different Types ◽  
Prevention And Control Measures ◽  
Dengue Prevention ◽  
And Control

Dengue fever is a painful mosquito-borne infection caused by different types of virus in various localities of the world. There is no particular medicine or vaccine to treat person suffering from dengue fever. Dengue viruses are transmitted by the bite of female Aedes (Ae) mosquitoes. Dengue fever viruses are mainly transmitted by Aedes which can be active in tropical or subtropical climates. Aedes Aegypti is the key step to avoid infection transmission to save millions of people in all over the world. This paper provides a standard guideline in the planning of dengue prevention and control measures. At the same time gives the priorities including clinical management and hospitalized dengue patients have to address essentially.

The Mediterranean Action Plan: A Regional Approach to Pollution Control

1986 ◽  
Vol 18 (9) ◽  
pp. 197-205
Author(s):  
Lj Jeftié ◽  
L. J. Saliba
Keyword(s):  
Mediterranean Sea ◽  
Action Plan ◽  
Control Measures ◽  
Industrial Wastes ◽  
Pollution Monitoring ◽  
Environmental Preservation ◽  
Agricultural Pesticides ◽  
The Mediterranean ◽  
A Prospective Study ◽  
And Control

Increasing concern over the deterioration of the Mediterranean sea as a result of increasing pollution by untreated sewage and industrial wastes, agricultural pesticides and fertilizers and oil discharges, led to a series of meetings between 1970 and 1974, and finally to the UNEP-sponsored Mediterranean Action Plan, adopted by governments of the region in 1975 and ongoing since that time. The legal component of the Plan includes a framework Convention and four protocols; the environmental assessment component (the MED POL programme) consists of national pollution monitoring programmes, and research projects conducted by Mediterranean institutions; the environmental management component consists of the Blue Plan (a prospective study combining socio-economic development with environmental preservation) and the Priority Actions Programme (a series of sub-region sectoral projects in defined areas). The Plan has been financed by Mediterranean States since 1979, and is managed by UNEP with the cooperation of other competent UN Agencies. During the last ten years, activities undertaken have improved knowledge of the state of pollution of the Mediterranean sea, and facilitated joint regional action in the form of preventive and control measures.

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