The east-west strike length is 1465 m, trend length is 240 m, coal seam is nearly horizontal, bedrock is thin, coal thickness is 3.1 m on average, and average buried depth is 200 m, which belong to the shallow buried coal seam. The 5-210 working face is located south of the Dianping Coal Mine Industrial Plaza, Wangjiazhuang Village and Dianping Village north of the Mata Village and east of the Nanling Shangcun Village. To rectify this issue, in this study, the 5-210 working face of the Dianping Coal Mine was used as the engineering background, and theoretical calculation, numerical simulation, and field measurements were combined to more accurately predict the surface subsidence range of the mined-out area, which provides an important theoretical basis for coal mining and building safety. However, they did not combine theoretical calculation with field measurement and only applied numerical simulation prediction. used numerical simulation to determine the surface subsidence boundary and surface collapse volume after mining in the mining area.
used FLAC3D to analyze the law of surface movement and deformation under the condition of thick loose layer mining. employed FLAC3D to study the law of surface subsidence under the filling of villages. Numerical simulations have an advantage in that because they are performed on a computer, conditions that cannot be reached by test methods can be applied. However, these prediction methods are applicable only to specific conditions, and varying mined-out area conditions lead to unsatisfactory prediction results, which pose a significant challenge to scholars and technicians who study mining subsidence. Some examples of the methods used in these studies are the typical curve method, profile function method, probability integration method based on continuum mechanics, and influence function method. Researchers worldwide have performed several studies on surface subsidence and its prediction in the mined-out area with remarkable results. Therefore, studying surface subsidence in mined-out areas is of great significance. Consequently, the surface movement and deformation will affect infrastructure, rivers, and pipelines, altering or even destroying them.
When the length and width of the mined-out area exceed 0.2–0.3 times the average mining depth, the movement and deformation of the rock formation near the starting coal-mining site will extend to the surface. This has destroyed the original mechanical equilibrium state within the rock mass and deformed and destroyed the overburden rock to varying degrees. With the rapid development of the national economy, the demand for coal has increased, and a large amount of coal has been extracted from the ground. Some statistics suggest that the coal buried under buildings, railways, and water bodies totals more than 14 trillion kg. IntroductionĬurrently, coal serves as China’s main energy source. The working face provided safe recovery of 1,471,446,000 kg of coal, resulting in significant economic and social benefits. The civil construction protection area was not deformed. Real-time dynamic observation data collected from 18 surface displacement monitoring points measured surface subsidence as 2.69 m. The mining boundary of the 5-210 working face was designed using the result of the simulation program. 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 FLAC3D5.0 program was used to simulate the evolution law of the overburden strata under the coal mining conditions of the study area. A mathematical model was established to predict the settlement range and displacement of the surface after coal mining. 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.
0 kommentar(er)
