Control Effect of Alluvium and Bedrocks on Surface Subsidence

2014 ◽  
Vol 675-677 ◽  
pp. 1376-1380
Author(s):  
Xue Yi Yu ◽  
Qi Wang ◽  
Bing Chao Zhao ◽  
Wen Bin Guo ◽  
Jin Dong Wang
Keyword(s):  
Influence Factors ◽  
Ground Surface ◽  
Surface Subsidence ◽  
Ground Movement ◽  
Control Effect ◽  
Key Stratum ◽  
Working Face ◽  
Movement And Deformation ◽  
Cutting Height ◽  
Discrimination Method

Through analyzing the structure of the alluvium and bedrocks, a discrimination method of main influence factors of surface subsidence was proposed, and the discrimination formula was put forward. Taking the overburden and ground surface of the large cutting height working face in Bin Chang mining region as the research object, the structure and location of key stratum and the structure of the alluvium was analyzed. Besides, through the surface monitoring, the parameters of ground movement and deformation was given, and the discrimination method was verified to be correct. Furthermore, using numerical simulation, the alluvium and bedrocks influences on the surface subsidence under different mining width were studied respectively; the ground movement and deformation characteristics under the influence of alluvium and bedrocks were put forward. The study has provided a basis for the prediction of surface subsidence under certain conditions.

Chapter 11 Coal mining subsidence in the UK

2020 ◽  
Vol 29 (1) ◽  
pp. 291-309 ◽  
Author(s):  
Laurance Donnelly
Keyword(s):  
Coal Mining ◽  
Longwall Mining ◽  
Ground Surface ◽  
Mining Subsidence ◽  
Ground Movement ◽  
Working Face ◽  
Mine Roadway ◽  
Coal Mining Subsidence ◽  
The Uk

AbstractOne of the geohazards associated with coal mining is subsidence. Coal was originally extracted where it outcropped, then mining became progressively deeper via shallow workings including bell pits, which later developed into room-and-pillar workings. By the middle of the 1900s, coal was mined in larger open pits and underground by longwall mining methods. The mining of coal can often result in the subsidence of the ground surface. Generally, there are two main types of subsidence associated with coal mining. The first is the generation of crown holes caused by the collapse of mine entries and mine roadway intersections and the consolidation of shallow voids. The second is where longwall mining encourages the roof to fail to relieve the strains on the working face and this generates a subsidence trough. The ground movement migrates upwards and outwards from the seam being mined and ultimately causes the subsidence and deformation of the ground surface. Methods are available to predict mining subsidence so that existing or proposed structures and land developments may be safeguarded. Ground investigative methods and geotechnical engineering options are also available for sites that have been or may be adversely affected by coal mining subsidence.

Research on the Temporal and Spatial Variation of Shallow Tunnel by Construction Disturbance

2013 ◽  
Vol 353-356 ◽  
pp. 1699-1703
Author(s):  
Zhi Li Sui ◽  
Xu Peng Wang ◽  
Zhao Guang Li ◽  
Xin Shuo Sun
Keyword(s):  
Negative Impact ◽  
Ground Surface ◽  
Ground Movement ◽  
Tunnel Construction ◽  
Linear Regression Method ◽  
Shallow Tunnel ◽  
Time Deformation ◽  
Deformation Law ◽  
Movement And Deformation ◽  
Surrounding Rock Stress

In order to reduce the negative impact of the environment by shallow tunnel construction, ground movement and deformation must be estimated correctly, through simulating the entire process of the shallow tunnel construction, the methods of monitor numbers analysis and numerical simulation have been used to validate the surrounding rock stress and strain in different situation, then the rules of stress changing and the trend of ground surface movement have been in-depth studied. On the basis, non-linear regression method considered time factor has been used to research the space-time deformation law of ground surface, the work provides a new way of estimating the effect on ground surface about shallow tunnel construction.

Analysis on Characteristics of Surface Subsidence with Han Jia Wan Coal Mine

2012 ◽  
Vol 524-527 ◽  
pp. 520-524 ◽  
Author(s):  
Xue Yi Yu ◽  
Peng Wang ◽  
Xing Liang Li
Keyword(s):  
Coal Mine ◽  
Scientific Basis ◽  
Surface Subsidence ◽  
Surface Cracks ◽  
Surface Movement ◽  
Working Face ◽  
Shallow Coal Seam ◽  
Movement And Deformation ◽  
Main Factors ◽  
Movement Parameters

Surface subsidence has some peculiarities for the mining of the Han jia wan coal mine. Based on the surface movement observation of 2304 working face in Han jia wan coal mine, mining strata movement parameters are analyzed, the main factors which influence the formation of surface cracks in the gob are proposed and the failure mechanism of surface movement and deformation are studied for the mining of shallow coal seam and thick loose bed. Correlative parameters are presented and scientific basis is established for the coal mining under buildings, rail and water and the leaving of the safety pillar in the future.

Study on the Law of Ground Subsidence for Shallow Buried and Thick Coal Seam by Fully Mechanized Caving Mining Method

2014 ◽  
Vol 1010-1012 ◽  
pp. 1554-1559 ◽  
Author(s):  
Gui Liu ◽  
Nai Zhong Xu ◽  
Kai Hua Sun
Keyword(s):  
Coal Seam ◽  
Ground Surface ◽  
Ground Movement ◽  
Active Period ◽  
Mining Method ◽  
Thick Coal Seam ◽  
Surface Movement ◽  
Movement And Deformation ◽  
The Law ◽  
Ground Surface Movement

In order to master the law of ground surface movement and deformation for shallow buried and thick coal seam under condition of fully mechanized caving mining method, and to gain experience of “mining under buildings, water body and railway”, a ground surface movement observation station was established above 14106 and 14107 working face of No.1 Well which belongs to China Coal Pingshuo Group co., Ltd. Then a series of observation was conducted according to the requirements of relevant technology. After that, process of sorting, calculating, analysis was conducted based on the observation data. As a result, characteristics of surface movement and deformation under this mining and geological condition were mastered by author, the surface subsidence calculation parameters and some surface movement angle parameters was calculated. Based on analysis of ground depression velocity and deflection in the period of ground movement, it is concluded that shallow buried depth with fully mechanized caving mining method has a shorter ground movement active period than that of deep mine, at the same time, its maximum subsidence velocity is big, ground movement and deformation is strenuous and subsidence during ground movement active period occupies a huge proportion of the total subsidence.

scholarly journals Experimental Study on Gangue Backfilling Materials Improved by Soda Residue and Field Measurement of Surface Subsidence

2021 ◽  
Vol 9 ◽  
Author(s):  
Wei Yin ◽  
Kun Zhang ◽  
Shenyang Ouyang ◽  
Xiaomin Bai ◽  
Wenjie Sun ◽  
...  
Keyword(s):  
Solid Waste ◽  
Reference Group ◽  
Surface Subsidence ◽  
Hydration Reaction ◽  
Control Effect ◽  
Bleeding Rate ◽  
Working Face ◽  
Slurry System ◽  
Early Strength ◽  
Gangue Backfilling

In coal mining, the problems of massive discharge of solid waste, environmental pollution, and surface subsidence disaster are urgent to be solved. Based on this engineering background, the feasibility of using solid waste soda residue to improve gangue cemented backfilling material was discussed, and the surface subsidence of the test working face was measured in this study. Besides, the influence of soda residue on the performance of gangue cemented backfilling materials was analyzed through laboratory tests. The experimental results show that 1) as the content of soda residue increases within the range of 0–12%, the slump of the soda residue gangue backfilling material (SRGBM) slurry gradually increases, and the bleeding rate increases. The early strength and later strength of SRGBM increase first and then decrease with the increase in soda residue content. 2) The optimal ratio of the soda residue cemented backfilling material is soda residue: fly ash: lime: cement: gangue = 6%: 34%: 10%: 2.5%: 47.5%. Compared with the reference group, the slump of the material is increased by 12.7%, the bleeding rate is only 3.8%, and the early strength and later strength are increased by 449 and 187%, respectively. 3) The addition of soda residue promotes the hydration reaction of the slurry system of soda residue cemented materials. The coexistence of C-S-H gel and N-A-S-H gel reduces the connectivity of pores and improves the strength of the material. 4) The maximum surface subsidence of the test working face is only 245 mm, and the surface subsidence control effect is good. Therefore, the preparation of SRGBM with soda residue can achieve energy saving and emission reduction, with significant technical, economic, and social benefits, and has good promotion and application value.

Field Measurement Research on Overburden Stratum Movement and Deformation

2012 ◽  
Vol 170-173 ◽  
pp. 1151-1157
Author(s):  
Chun Yi Li ◽  
Jie Chen ◽  
Hai Feng Wu
Keyword(s):  
Field Measurement ◽  
Surface Subsidence ◽  
Displacement Curve ◽  
Function Model ◽  
Key Stratum ◽  
Movement Characteristics ◽  
Movement And Deformation

According to field measurement datum in disturbed overburden stratum of five drillings, disturbed overburden stratum movement characteristics were analyzed. Negative exponent function model of measurement points movement law was also constructed. Moreover, variation law of stratum subsidence speed and relation between overburden stratum subsidence factor and surface subsidence factor were deeply researched. The results show that starting-distance of panel is nearly 70m, bedrock and alluvium subside synchronically and key-stratum isn’t exist in overburden stratum. Also, displacement curve of measurement points in stratum submits negative exponent function model and mutagenesis of surveying points subsidence speed is the key position where face passed drilling 100m. Furthermore, subsidence factor of overburden stratum and surface submits exponent function model.

scholarly journals The field monitoring experiment of the high-level key stratum movement in coal mining based on collaborative DOFS and MPBX

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaozhen Wang ◽  
Jianlin Xie ◽  
Weibing Zhu ◽  
Jialin Xu
Keyword(s):  
Optical Fiber Sensor ◽  
Ground Surface ◽  
Boundary Curve ◽  
Relative Displacement ◽  
Ground Subsidence ◽  
Key Stratum ◽  
Working Face ◽  
Distributed Optical Fiber Sensor ◽  
High Level ◽  
The Impact

AbstractThe deformation and movement characteristics of high-level key stratums in overlying strata are important for estimating ground subsidence and understanding failure characteristics of ultrathick strata during mining. In this study, a distributed optical fiber sensor (DOFS) and multipoint borehole extensometers (MPBXs) were collaboratively employed to monitor the deformation of high-level key stratums in situ during the mining process at working face 130,604 of the Maiduoshan Coal Mine. DOFS monitoring results showed that the distance from advance influence of mining on the ground surface is 219.2 m. The deformation of the shallow stratums were greater and was affected earlier than that of the deep stratums. The deformation in the strata did not occur continuously and the boundary curve of the impact from advance mining was not a straight line with the advancement of the working face. By the MPBX technology, we measured the strata movement and obtained four-stage characteristics of high-level key stratum movement. The subsidence of the primary key stratum and the sub key stratum were monitored to reach 1389 and 1437 mm; their final relative displacement differed by 48 mm. No bed separation was observed in between the strata, and the key stratums tended to sink as a whole with the advancement of the working face. This research guides the analysis the movement of thick high-level key stratums.

scholarly journals Research on Overlying Strata Control of Longitudinal and Latitudinal Filling Mining

2021 ◽  
Author(s):  
Fuyu zhang ◽  
Zhongping Guo ◽  
Chengqian He ◽  
Chao Leng
Keyword(s):  
Ground Surface ◽  
Mining Method ◽  
Control Effect ◽  
Practical Applications ◽  
Mining Policy ◽  
Mechanics Model ◽  
Working Face ◽  
Filling System ◽  
Excellent Control ◽  
Overlying Strata

Abstract Abstract: In order to solve the problem of "three unders" coal resources and respond to the national green mining policy, combining with the advantages of short wall strip filling and long wall strip filling, we propose a longitude and latitude filling mining method with high recovery ratio and simple operation,where a latitude and longitude filling network is gradually constructed behind the working face to control the subsidence of the overlying strata.This article introduces the filling system, technological process and filling pipeline layout of the latitude and longitude filling mining method, and constructs the latitude and longitude filling mechanics model by using the elastic foundation theory, and gives the calculation formula for the roof subsidence and the stress of the filling body.By means of numerical simulation,the control of the longitudinal and latitudinal filling overburden was researched.The influence of the quality of the filling, the width of the filling, the spacing of the filling on the roof subsidence and the reasonable filling parameters of the 1207 working face were determined.The roof subsidence, the stress of the filling body and the deformation of the ground surface during the mining process were monitored by means of field monitoring, and the excellent control effect of the latitude and longitude filling mining on the overlying strata is confirmed in practical applications.

scholarly journals Sensitivity Analysis and Numerical Simulation Study on Main Controlling Factors of Surface Movement and Deformation in Strip Filling Mining under Thick Unconsolidated Layers

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Dequan Sun ◽  
Quanlin Wu ◽  
Xiaoyan Li ◽  
Zhaomin Zhang ◽  
Xiaotian Xu ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Influence Factors ◽  
Surface Subsidence ◽  
Control Technology ◽  
Filling Rate ◽  
Surface Movement ◽  
Deformation Parameters ◽  
Body Strength ◽  
Movement And Deformation ◽  
Coal Pillars

In many mining areas, there is a lot of pressed coal under buildings, railways, and water bodies, and there are geological conditions of thick unconsolidated layers, so the surface subsidence has certain particularity. The key to solve the problem of pressed coal is the control technology of surface subsidence. The development of strip filling technology provides a kind of economical and effective surface subsidence control technology. With the passage of time, the natural weathering, flow, and fracture of some coal pillars may lead to the instability and failure of some coal pillars. Therefore, the selection of filling parameters plays an important role in the stability of coal pillars. In order to study the influence factors of surface movement and deformation, considering the influence factors of filling rate, key layer thickness, filling body strength, and unconsolidated layer thickness, FLAC 3D was used to simulate the surface movement deformation, and the orthogonal test method was used to analyze the simulation results, and the sensitivity of the main control factors affecting the surface deformation affected by strip filling mining was studied. The results show that the order of importance of the four factors on the four surface movement and deformation parameters is filling rate > key layer thickness > filling body strength > unconsolidated layer thickness. The influence of these four factors on the surface movement and deformation parameters is gradually decreasing, but the influence degree of different factors has drawn a certain gradient.

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