Study on the Structure Model and Controlling Method of Subsidence in Flat Seam and Deep Mining

2006 ◽  
Vol 306-308 ◽  
pp. 1403-1408 ◽  
Author(s):  
Chong Ge Wang ◽  
Wei Zhong Chen ◽  
Liyou Pan
Keyword(s):  
Research Work ◽  
Surface Subsidence ◽  
Deep Mining ◽  
Global Positioning ◽  
Coal Wall ◽  
The Face ◽  
Surface Subsidence Control ◽  
The Common ◽  
And Control ◽  
Overlying Strata

The stratum movement and surface subsidence is considered as a whole system in the research work. The key of the surface subsidence control lies first in having thorough knowledge of the dynamic changeable of the overlaying strata movement as the face advances so as to establish the corresponding structure mechanics subsidence model in flat seam and deep mining. The common characteristic of stratum movement and the development procedure of crack arch are described in this paper. The structure constituents of subsidence and their influencing factors are also analyzed. Meanwhile, the surface subsidence is determined by the compressing of coal wall and the bending of the overlying strata. Based on the ground observation by the global positioning system, the boundary angle and the motion angle are determined. Furthermore, according to the research law, one can predict and control the surface subsidence damages for the special geologic conditions.

New Technology of Surface Subsidence Control and Environmental Protection Research in Coal Mining Region

2014 ◽  
Vol 675-677 ◽  
pp. 1385-1394
Author(s):  
Cheng Rong Jiang ◽  
Liu Yang ◽  
Hao Xie ◽  
Hua Yi Huang ◽  
De Ke Sun
Keyword(s):  
Coal Mining ◽  
New Technology ◽  
Mining Area ◽  
Industrial Test ◽  
Surface Subsidence ◽  
High Concentration ◽  
Geological Conditions ◽  
Surface Subsidence Control ◽  
Fissure Water ◽  
Overlying Strata

In combination with the geological conditions of Tie'er mining area in Tangshan coal mining, this paper not only analyzes the evolution of overlying strata structure in stope and the development law of overlying strata separation, also proposes a new continuous grouting technology with large flow and high concentration slurry. The industrial test showed that, when the grout-mining ratio of the whole mining area is 25.3%, the reducing subsidence ratio is 51.5%, the effect of reducing the surface subsidence is good. According to the chemical analysis of water quality ingredients of slurry, the test result showed, heavy metals contents in fly-ash slurry water do not exceed the standard, which has no bad effect on the fissure water in the bedrock.

Optimization Study of Advance Support in the Roadway of Paste Filling Working Face

2011 ◽  
Vol 255-260 ◽  
pp. 3702-3707
Author(s):  
Shao Jie Chen ◽  
Wei Jia Guo ◽  
Hai Long Wang ◽  
Bo Li
Keyword(s):  
Working Face ◽  
Optimization Study ◽  
Coal Wall ◽  
The Face ◽  
Strata Behavior ◽  
Behavior Characteristics ◽  
Working Efficiency ◽  
Practical Measure ◽  
Main Influence ◽  
Overlying Strata

On the basis of the field measurement, the characteristics of advance strata behavior are analyzed in the past filling working face and the advance support method is optimized in the roadway. The practical measure researches show that, because the paste filling supports the overlying strata of the goaf availably, the strata behaviors of 2351 paste filling working face in Daizhuang coalmine are not obvious; And the protective pillar bears a little load, The strata behaviors in non-production side are smaller than that in production side. The overlying strata gravity mainly acts on the coal wall in front of the face and the paste filling in the goaf. The value and main influence range of advance stress in front of the face is quite small and the main influence range is less than 15m. According to the advance strata behavior characteristics of the paste filling working face, the advance support of the track roadway is changed from 3 rows to 2 rows. And the support length of each row reduces from 20m to 15m. The advance support after optimizing can reduce the labor intensity greatly and improve the working efficiency of backfill mining.

Profitable research in a marketing oriented business

1969 ◽  
Vol 312 (1510) ◽  
pp. 301-307 ◽  
Keyword(s):  
New Products ◽  
Research Work ◽  
Scientific Research ◽  
Research Projects ◽  
Research Department ◽  
The Face ◽  
To Come ◽  
Almost All ◽  
And Control ◽  
Work Done

It is hardly a generation ago since scientific research began to come into general use, at least in the larger companies, as a means of enhancing profits. Many of us will have actually seen it grow from small beginnings in our own businesses, or will at least remember those who did. It probably started tentatively in the face of many doubts and difficulties, but when its benefits, in the form of new products, were clearly seen, it was encouraged to grow. Then, as the years went by, it became in many cases the Juggernaut which seemed to have the power to keep rolling under its own momentum; and now, for the last decade, we have seen a spate of literature designed to show us how to steer it and control its speed. It tended to run away because almost all the judgements about its size were subjective and often emotion-laden opinions. So, to counter-balance them, control is being sought through the introduction of more objective criteria. The purpose of this paper is to discuss a few of the ways in which a multi-product marketing oriented business has set about trying to control the resource of scientific research as a means to success. This control falls into three categories: (1) the size of the research department; (2) the portfolio of research projects; (3) the efficiency of the research work done in the department.

Battle

2011 ◽  
Author(s):  
Cathal Nolan
Keyword(s):  
20Th Century ◽  
Collaborative Writing ◽  
Cultural Issues ◽  
Top Down ◽  
The Face ◽  
Intimate Knowledge ◽  
The Common ◽  
Tactical Decisions ◽  
And Control ◽  
The 19Th Century

Traditionally, much literature on war details battles and campaigns. Quality varies from compilations of précis to full-length books on “decisive battles.” Much of this work is overly heroic and largely uncritical, but some is deeply scholarly. Accurate battle and operational history is extremely hard to write, especially about wars distant in time. It is also hard to read and understand, and it requires intimate knowledge of topography, not to mention an appreciation of logistics, leadership, command and control, and tactics that frequently change depending on the time and place and what army is involved. Traditional histories were often overly reliant on a few eyewitnesses or took the “top-down” approach dictated by heavy reliance on commanders’ memoirs. Thus, they too often were concerned primarily with military reputations, critical tactical decisions made or not made by commanders which putatively turned the tides of whole campaigns and even wars. From the 19th century, war diaries and letters home by more educated men sprinkled among a generally and more commonly illiterate soldiery enriched battle and campaign reconstructions, but still emphasized command decisions in battle reconstructions. Indeed, they amplified that bias by leaving out the common soldiers’ experiences, recollections, and perspectives. Modern accounts often benefit from the necessary collaborative writing by teams of historians or military professionals working from a multitude of sources on enormous battles of the 20th century, or extending this methodology back to earlier times. Eyewitness oral histories, interviews, and detailed after-action reports have become key sources in writing battle and campaign history, in addition to “official histories” and ever-wider publication of battle memoirs by even very low-level participants in modern wars. Battle study today nearly always includes “bottom-up” social and cultural issues, better reflecting the “face of battle” as it has been and continues to be experienced by ordinary soldiers.

scholarly journals Surface Subsidence Control Mechanism and Effect Evaluation of Gangue-Backfilling Mining: A Case Study in China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Huaizhan Li ◽  
Guangli Guo
Keyword(s):  
Surface Deformation ◽  
Material Model ◽  
Simulation Method ◽  
Surface Subsidence ◽  
Deformation Characteristics ◽  
Resource Exploitation ◽  
Similar Material ◽  
Surface Subsidence Control ◽  
Gangue Backfilling ◽  
Overlying Strata

Comprehensive mechanization solid backfilling mining is a new technology developed in China for coal mining and surface subsidence control. Based on a gangue-backfilling project in the Yangzhuang Coal Mine, the characteristics of underlying strata and surface deformation were studied by similar-material simulation method. When the ratio of the sponge to foam was 1 : 3, the mixture can simulate well the deformation characteristics of gangues in the similar-material model. On this basis, the movement and deformation characteristics of the overlying strata caused by gangue-backfilling mining were studied. The findings indicate that compared with caving mining, the expansion coefficient of overlying strata, the interlayer fracture, and the subsidence value were smaller in backfilling mining, with the integral overlying strata subsidence occurring. Meanwhile, the reduction ratio of surface subsidence after backfilling mining was more than 85%, verified by the subsidence-monitoring results. The research outcomes in this paper have significance for coal resource exploitation of similar mines around the world.

scholarly journals Surface Subsidence Control during Deep Backfill Coal Mining: A Case Study

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Baiyi Li ◽  
Nan Zhou ◽  
Wenyue Qi ◽  
Ailing Li ◽  
Zhizhong Cui
Keyword(s):  
Coal Mining ◽  
Mining Area ◽  
Filling Ratio ◽  
Surface Subsidence ◽  
Integral Model ◽  
Resource Exploitation ◽  
Machine Material ◽  
Deep Mining ◽  
Backfill Mining ◽  
Surface Subsidence Control

Deep resource exploitation is imperative, but it is facing with more complicated mining environment and more dangerous mining disturbances to induce the potential catastrophe process. Solid backfill technology, which can control the strata movement and prevent potential hazards, has been used as the primary method in deep mining for surface subsidence control and ecosystem protection. In this study, taking backfill mining area no. 930 in the Tangkou coal mine as background, the probability integral model was adopted to predict the surface subsidence at different mining depths and filling ratios. The filling ratio was designed for deep mining based on the regression analysis of the predicted surface subsidence results. The study shows that the backfilling ratio at the Tangkou deep coal mining area should be controlled at a level greater than 82.5%, and the mining damage to the surface under this condition was analyzed. Furthermore, control strategies for deep backfill mining are proposed in which the backfill density can be enhanced by optimizing the tamping machine, material composition, and tamping process. Finally, the measurement of the backfill mass and surface subsidence showed that the actual filling ratio was controlled at 82.57%, which ensures adequate protection of the surface buildings during the mining process.

scholarly journals Clinical Observation of 48 Cases of Black Eye Circle Treated with Modified Yu Rong San Gel Eye Mask

2021 ◽  
Vol 5 (4) ◽  
pp. 47-51
Author(s):  
Jinmei He ◽  
Chenglong Li ◽  
Yunhua Liu ◽  
Ping Huang ◽  
Meng He ◽  
...  
Keyword(s):  
Treatment Group ◽  
Clinical Effect ◽  
Clinical Observation ◽  
Effective Rate ◽  
Control Group ◽  
Black Circle ◽  
The Face ◽  
The Common ◽  
The Difference ◽  
And Control

Objective: To observe the clinical effect of modified Yu Rong San gel eye mask in the treatment of dark circles. Methods: 96 cases of patients with dark circles were randomly divided into treatment group and control group. In the control group and the treatment group, the common eye mask and the modified Yu Rong San gel eye mask were applied to the black circle area respectively. After 15min, water was used to wash the face, the application of the mask for one time a day, four weeks, one course, and three courses were observed. Results: After three courses of treatment, the total effective rate of the treatment group was higher than that of the control group (P<0.05); the area of black eye circles in the treatment group was smaller than that before treatment (P<0.05); compared with the control group, the score of black eye circles was lower than that before treatment, the difference was statistically significant (P<0.05). Conclusion: Addition and reduction of Yu Rong San gel eye mask is effective in the treatment of dark circles.

Geomechanics Research with Critical Depth Prediction and Surface Subsidence Range Controlling

2014 ◽  
Vol 952 ◽  
pp. 155-160
Author(s):  
Jian Ming Zheng ◽  
Feng Yu Ren ◽  
Lie Xian Tang
Keyword(s):  
Friction Angle ◽  
Surface Subsidence ◽  
Control Surface ◽  
Critical Depth ◽  
Deep Mining ◽  
Depth Prediction ◽  
Rock Stability ◽  
Bulk Solid ◽  
Support Force ◽  
And Control

Traditional subsidence range prediction by stagger angle doesn’t adapt to production situation in deep mining, the angle is usually large. Analyze the lateral support force of the moving bulk solid in the subsidence pit based on maintaining sidewall rock stability of subsidence pit. While bulk solid thickness of subsidence pit is not less than critical bulk solid column, the active pressure and passive pressure of bulk solid prevent the scaling of sidewall rock together. By analyzing the measured data of subsidence range of Xishimen mine, the height of critic bulk solid column relates to stability of rock, sidewall angle of goaf, internal friction angle, and rock loose coefficient. In deep mining, that filling subsidence pit with waste rock can lower the critical depth and control surface subsidence range.

Analysis and Control the Surface Settlement of Tunnel Excavation

2013 ◽  
Vol 438-439 ◽  
pp. 939-942
Author(s):  
Jing Jing Li ◽  
Hui Ren Bai ◽  
Jin Kui Li
Keyword(s):  
Settling Tank ◽  
Surface Subsidence ◽  
High Tech ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Deformation Control ◽  
Geological Conditions ◽  
Surface Subsidence Control ◽  
And Control ◽  
Technical Measures

Combined with the station of Maritime University ~ High-tech Zone tunnel project, this paper analyzes each section of the measured data on the spot to determine the surface subsidence. Research results show that the soil geological conditions of different effects on the subsidence are obvious, but shapes which formed by the settling tank are similar. Meanwhile, combining the construction of advanced small pipe grouting and shotcreting concrete technical measures, the surface subsidence control of the project abides by the surface subsidence rule of the shallow tunnel construction and deformation control.

scholarly journals A Security Scheme Based on Intranal-Adding Links for Integrated Industrial Cyber-Physical Systems

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2794
Author(s):  
Dandan Zhao ◽  
Can Liu ◽  
Hao Peng ◽  
Juan Yu ◽  
Jianmin Han
Keyword(s):  
Research Work ◽  
Cyber Physical Systems ◽  
Cascading Failure ◽  
Entire System ◽  
Physical Systems ◽  
System Environment ◽  
Security Scheme ◽  
Industrial Internet ◽  
The Face ◽  
And Control

With the advent of the Internet of Everything era, the Industrial Internet is increasingly showing mutual integration and development. Its core framework, the industrial CPS (Cyber-Physical Systems), has received more and more attention and in-depth research in recent years. These complex industrial CPS systems are usually composed of multiple interdependent sub-networks (such as physical networks and control networks, etc.). Minor faults or failure behaviors between sub-networks may cause serious cascading failure effects of the entire system. In this paper, we will propose a security scheme based on intranal-adding links in the face of the integrated and converged industrial CPS system environment. Firstly, by calculating the size of the largest connected component in the entire system, we can compare and analyze industrial CPS systems’ security performance under random attacks. Secondly, we compare and analyze the risk of cascading failure between integrated industrial CPS systems under different intranal-adding link strategies. Finally, the simulation results verify the system security strategy’s effectiveness under different strategies and show a relatively better exchange strategy to enhance the system’s security. In addition, this paper’s research work can help us design how to further optimize the interdependent industrial CPS system’s topology to cope with the integrated and converged industrial CPS system environment.

Sign in / Sign up

Export Citation Format

Share Document