Abstract
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.
Highlights
Coal serves as China’s main energy source
Some examples of the methods used in these studies are the typical curve method, profile function method [1], probability integration method [5] based on continuum mechanics, and influence function method [6,7,8]
Guo et al used FLAC3D to analyze the law of surface movement and deformation under the condition of thick loose layer mining [10]
Summary
Coal serves as China’s main energy source. Some statistics suggest that the coal buried under buildings, railways, and water bodies totals more than 14 trillion kg [1]. Some examples of the methods used in these studies are the typical curve method, profile function method [1], probability integration method [5] based on continuum mechanics, and influence function method [6,7,8] 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. They did not combine theoretical calculation with field measurement and only applied numerical simulation prediction 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. Because there are industrial squares and villages near the surface, it is necessary to rationally design the location of the 5-210 working face and recover coal resources as much as possible without affecting the stability of surface buildings
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