Simulation of Mining-Induced Ground Damage Using Orthogonal Experiments to Determine Key Parameters of Super-Large Coalface: A Case Study in Shendong Coalfield in China
| Autor: | Cai Yinfei, Wenkai Zhang, Xiaojing Li, Wu Xiao |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0211 other engineering and technologies
key parameters of a super-large coalface 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences lcsh:Technology lcsh:Chemistry global ground damage extent index (dei) Mining engineering variance analysis General Materials Science Instrumentation lcsh:QH301-705.5 021101 geological & geomatics engineering 0105 earth and related environmental sciences Fluid Flow and Transfer Processes Strike and dip Computer simulation lcsh:T Process Chemistry and Technology General Engineering Excavation Subsidence lcsh:QC1-999 Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 mining subsidence lcsh:TA1-2040 Key (cryptography) orthogonal experiment lcsh:Engineering (General). Civil engineering (General) Geology lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 10, Iss 7, p 2258 (2020) Applied Sciences Volume 10 Issue 7 |
| ISSN: | 2076-3417 |
| Popis: | High-strength mining of super-large coalfaces in the Shendong coalfield causes significant damage to the ground surface. To study the key parameters of undermined coalfaces that affect ground damage, 25 numerical simulation models were designed using an orthogonal experimental method based on the geological and mining conditions of the Bulianta Mine. In the orthogonal design, four factors (the lengths in both the dip and strike directions, the thickness and the mining speed of the coalface) were considered, with five levels designed for each factor. The subsidence displacements and deformations caused by the excavation were then simulated and verified using field surveying data. A damage extent index (DEI) was introduced and used to assess the extent of global ground damage caused by each simulative excavation. Analysis of variance (ANOVA) method was then employed to determine the key parameters of the coalface that significantly influence the ground damage. It was found that the coalface dip length and thickness and the coalface thickness can be regarded as the key parameters for ground objects of building and timberland, respectively. This research provides theoretical and technical support for the coordinated exploitation of resources and environments in Shendong and other similar, ecologically fragile coalfields. |
| Databáze: | OpenAIRE |
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