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 Surface Movement and Deformation by Mining in Loess Gully Region

2013 ◽  
Vol 295-298 ◽  
pp. 3005-3009
Author(s):  
Bing Chao Zhao ◽  
Xue Yi Yu ◽  
Jin Dong Wang
Keyword(s):  
Risk Assessment ◽  
Prediction Model ◽  
Theory Model ◽  
Surface Subsidence ◽  
Level Surface ◽  
Surface Movement ◽  
Movement And Deformation ◽  
Analysis Prediction

Aims at the problem on surface subsidence calamity in loess gully region , applies on the best result of surface subsidence disaster by mining, basis on analysis prediction model of level surface and character of surface movement and deformation in gully region, and combines the character of landslide and slip accompanies hilly surface movement and deformation by mining, and establishes theory model of surface movement and deformation and determine model of the landslide may occur, it is further verified correctness and rationality by project, and It has some significance on hilly surface movement and deformation and protect the object of risk assessment.

Mechanism of Abnormal Surface Subsidence Induced by Fault Instability

2020 ◽  
Author(s):  
Gangyan Zhang
Keyword(s):  
Rock Mass ◽  
Fault Zone ◽  
Hanging Wall ◽  
Friction Angle ◽  
Soil Mass ◽  
Surface Subsidence ◽  
Surface Movement ◽  
Fault Stability ◽  
Movement And Deformation ◽  
Dip Angle

Abstract Surface movement and deformation with faults differ significantly from that without faults, which the surface movement and deformation at the fault outcrop generally abnormally increase when a fault occurs in the overlying strata and loses stability as a result of mining. To explore the mechanism of abnormal surface subsidence induced by fault instability due to mining in the hanging wall and footwall, mechanical models for the fault slip and soil cantilevers were separately established. Moreover, based on numerical and similarity simulation experiment, the difficulty degrees of fault instability were compared and analysed during mining in hanging wall and footwall. The research results show that: (1) the abnormal surface subsidence at fault outcrop is caused by fracture of soil mass at the fault outcrop due to the cantilever effect. (2) The fault zone that can be stabilised during mining in the hanging wall is broader than that during mining in the footwall, and a fault remains stable when mining in hanging wall and the surface at fault outcrop is more likely to experience stepped subsidence when mining in the footwall. (3) Fault stability worsens with the growth of the fault dip angle when mining in hanging wall, the fault is certainly subjected to slip and instability when fault dip angle is lower than the internal friction angle of the rock mass within the fault zone and fault stability strengthens with increasing fault dip angle during mining in the footwall. (4) When mining in the footwall, the ratio of shear stress to normal stress at the fault outcrop is about five times that when mining in the hanging wall and the fault is more likely to undergo slip and instability during mining in the footwall. (5) As a natural weak plane in the rock mass, a fault exerts a blocking effect on the transfer of mining-induced stress and overburden movements.

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.

Study and Entironmental Impact Evaluation on an Expanding Project of Coal Mine

2012 ◽  
Vol 518-523 ◽  
pp. 1278-1281
Author(s):  
Rong Jun Su
Keyword(s):  
Coal Mine ◽  
Prediction Models ◽  
Point Of View ◽  
Ground Subsidence ◽  
Land Occupation ◽  
Surface Movement ◽  
Biomass Loss ◽  
Movement And Deformation ◽  
Regional Landscape ◽  
Technical Features

To asses entironmental feasibility of Expanding and Improving Project on Xihe Coal Mine (EIPXCM) and predict it’s influence on entironment, according to related regulations and technical features of the project, prediction models and parameters of surface movement and deformation were determined. Its influence evaluation was down. The results shows that the largest value of ground subsidence in whole mine field is 1.219 m, and corresponding affected scope of surface movement and deformation is 42673 m2. Then the appraisals of entironmental impact on land sink, soil erosion, land occupation, biomass loss, wild animals and landscape ecology were done. The results indicates that only a little land occupied, there will not be big change on regional landscape situation and the project will affect ecosystem very little. Finally, relieving measures of entironmental influence were proponed. Therefore, on the conditions of taking proponed measures, this project is feasible from the point of view of entironment.

scholarly journals The Formation Mechanism of Surface Landslide Disasters in the Mining Area under Different Slope Angles

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Chi Mu ◽  
Xueyi Yu ◽  
Bingchao Zhao ◽  
Dongdong Zhang ◽  
Xuwei Mao ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Formation Mechanism ◽  
Slope Angle ◽  
Mining Area ◽  
Rock Stratum ◽  
Effective Prevention ◽  
Surface Movement ◽  
Working Face ◽  
Geological Conditions ◽  
Movement And Deformation

Slope stability analysis is important for the safe mining of mineral resources. The collapse of goafs in loess gullies can lead to natural disasters such as surface landslides. In this context, this study analyzes monitoring data obtained from surface observation in the Shendong mining area of the Hanjiawan coal mine based on the geological conditions therein. The monitoring results show that the working face experiences a starting period, an active period, and a declining period, from the start of mining to the end of the working face. At the initial mining stage, there is no evident surface movement or deformation in the mining area. When the advance distance of the 12106 working face is between 13 m and 109 m, the surface movement and deformation vary significantly, and the maximum subsidence reaches 1963 mm, which is enough to cause landslides. We select the physical and mechanical parameters of the rock and soil in the mine and then simulate the formation mechanism of surface landslides under different slope angles of the mining area using FLAC3D software. Because of the collapse of the mined-out area, the overlying strata structure is destroyed, the subsidence basin is shifted to the center as a whole, and the slope mass is subjected to tensile and compression deformation, resulting in plastic damage, which develops downward along the crack and leads to a collapse because of the discontinuous movement and deformation of the surface; moreover, step-type ground fissures are produced. The results also show that when the slope angle is greater than 60°, the displacement of the slope mass is not uniform, and the rock stratum in a position with large displacement loses its support, leading to landslides; when the slope angle is less than 30°, the bedrock surface forms a sliding surface and develops to the surface, thus decreasing the possibility of landslides. Based on the stability analysis of the collapsed slope in the goaf of the loess gully, a scientific basis is provided for the effective prevention and control of geological disasters in the Shendong mining area.

scholarly journals The Development Law of Mining-Induced Surface Cracks in Shallow Coal Seam Through Double Gullies Terrain: A Case Study in a Mine

2021 ◽  
Author(s):  
Mingjiao Lu ◽  
Xueyang Sun ◽  
Enke Hou ◽  
Cheng Li ◽  
Yonggang Zhang
Keyword(s):  
Coal Seam ◽  
Relative Position ◽  
Simulation Experiment ◽  
Slope Angle ◽  
Vertical Displacement ◽  
Surface Cracks ◽  
Maximum Width ◽  
Working Face ◽  
Shallow Coal Seam ◽  
Seam Mining

Abstract Mining-induced surface cracks in gullies in shallow seams seriously threaten the development of ecological stability and the safety of mine production. The development law of surface cracks in shallow coal seam mining through double gullies terrain was studied, by taking the Cao Jiatan coal mine in the Yushen Mining Area as a project example. The function T and its discriminant were first put forward to describe the relative position both the surface cracks and working face advanced in shallow coal seam mining through double gullies terrain. The relationship between valley parameters of double gullies terrain and the relative position of surface cracks development was discussed through numerical simulation experiment, similar material simulation experiment and theoretical analysis. The results showed that when the working face passed through the G1 gully, the development of surface cracks led the working face. There were four surface cracks with a maximum width of 23 cm, and the maximum vertical displacement was 11 cm; while passing through the G2 gully, the development of surface cracks lagged the working face. There were seven surface cracks with a maximum width of 79 cm, and the maximum vertical displacement was 45 cm. It can be concluded that the relative position of crack development is greatly affected by geological conditions, gully depth, slope angle, span and other factors of the gully, among of which the gully slope angle is the main influencing factor. T and |T| value has a certain correlation with the lagging distance, crack width, vertical displacement and the total number of cracks in a single gully.

scholarly journals Prediction of Mining Subsidence in Shallow Coal Seam

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Gang Li ◽  
Qinghe Yang
Keyword(s):  
Coal Mining ◽  
Surface Displacement ◽  
Surface Subsidence ◽  
Observation Data ◽  
Time Dynamic ◽  
Working Face ◽  
Mining Conditions ◽  
Protection Area ◽  
Shallow Coal Seam ◽  
Overburden Strata

Theoretical calculation, numerical simulation, and field measurement were combined to study the recovery of coal resources in the 5th pan area of Dianping Coal Mine without damaging surface buildings. A mathematical model was established to predict the settlement range and displacement of the surface after coal mining. The FLAC3D5.0 program was used to simulate the evolution law of the overburden strata under the coal mining conditions of the study area. The lateral influence range was 45.8 m and 42.4 m, and the maximum surface subsidence was 2.604 m and 2.78 m, respectively. The mining boundary of the 5-210 working face was designed using the result of the simulation program. Real-time dynamic observation data collected from 18 surface displacement monitoring points measured surface subsidence as 2.69 m. The civil construction protection area was not deformed. The working face provided safe recovery of 1,471,446,000 kg of coal, resulting in significant economic and social benefits.

Study on Surface Movement and Deformation Characteristics and Pillar Stability of Large Strip Mining under Deep Mining

2013 ◽  
Vol 734-737 ◽  
pp. 531-534
Author(s):  
Jun Tao Chen ◽  
Kai Kai Sheng ◽  
Li Min Yin ◽  
Chuan Qiang Wu
Keyword(s):  
Practical Significance ◽  
Strip Mining ◽  
Deformation Characteristics ◽  
Mining Technology ◽  
Pillar Stability ◽  
Deep Mining ◽  
Surface Movement ◽  
Working Face ◽  
Movement And Deformation ◽  
Overlying Strata

Large strip mining technology could effectively control the surface subsidence inducing from overlying strata movement and realize green mining. Bored stress and deformation sensors were laid in 4301 working face pillar of Shandong energy zibo mining group tangkou coal, analyzing the strip pillar stress pre and post working face; numerical simulation was used to study the influence of overlying strata from reserved size of strip pillar. According to the observation results of surface movement and deformation, law of surface movement and deformation characteristics was studied, which contributed to the practical application of large strip mining technology under deep mining and had the important theoretical and practical significance for mining under buildings ,railways and water in Chinese.

scholarly journals Field Study on the Law of Surface Subsidence in the High-Intensity Fully Mechanized Caving Mining Working Face with Shallow Thick Bedrock and Thin Epipedon in Hilly Areas

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yi Tan ◽  
Hao Cheng ◽  
Shuang Gong ◽  
Erhu Bai ◽  
Minchao Shao ◽  
...  
Keyword(s):  
High Intensity ◽  
Surface Subsidence ◽  
Shaanxi Province ◽  
Shanxi Province ◽  
Movement Duration ◽  
Stabilization Time ◽  
Surface Movement ◽  
Surface Stabilization ◽  
Working Face ◽  
The Law

Shallow and thick coal seams occur extensively in hilly areas in Shanxi Province and Shaanxi Province, China. The surface damage and landslides caused by shallow fully mechanized caving mining have a very serious impact on the environment. To provide a theoretical and reference foundation for mine environmental protection in hilly settings, a research on surface movement of the high-intensity fully mechanized caving mining working face with shallow thick bedrock and thin epipedon (HIFMCMWFSTBTE) is urgently needed. In this study, using the P2 working face of a mine as the research object, three surface subsidence observation lines were arranged in this working face to analyze the dynamic change characteristics of surface subsidence. Besides, the law of surface movement, mining sufficiency, fracture development and distribution characteristics, subsidence speed, and surface movement duration of HIFMCMWFSTBTE in hilly areas were comparatively studied. The research results reveal that the upper part of the slope slides towards the downhill direction under the action of tensile stress or push stress. As a result, the range of the horizontal movement towards the downhill direction of the slope and the range of surface movement both increase, and the movement angle and boundary angle both decrease compared with the plain. HIFMCMWFSTBTE is prone to serious sudden discontinuous damage. Fractures on the gully region surface develop along the contour, forming a crisscross fracture network, and the fractures are not easy to close after being generated. HIFMCMWFSTBTE in hilly areas can achieve full mining more easily than those of other geological conditions. According to the field measurement, critical full mining can be achieved in P2 working face when the ratio of mining width to mining depth is 1.07. The surface movement duration of HIFMCMWFSTBTE in hilly areas is relatively short. Considerable subsidence will occur in the active stage, and the surface subsidence is sudden and violent. The measured surface stabilization time of the P2 working face is only 20% of the calculated value in the Specification for Coal Pillar Reservation and Coal Mining under Buildings, Water Bodies, Railways, and Main Shafts (hereinafter referred to as the Specification), indicating that the specification's empirical formula is inapplicable to the calculation of surface stabilization time of the P2 working face.

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