Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement

We established an evaluation index of the rock mass stress state for underground coal mines using the strength-stress ratio based on the measured in situ stress and the generalized Hoek–Brown strength criterion. Three in situ stress states, σcm/σ1m < 1.4 (high), 1.4 < σcm/σ1m < 3.6 (medium)...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Donghui Yang, Bohu Yang, Zhaoheng Lv, Yongming Li, Hongming Cheng, Zhangxuan Ning
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040 Mathematics QA1-939
Acceso en línea:	https://doaj.org/article/3af5e97cf3a94758829bc9baef5c23f0
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:3af5e97cf3a94758829bc9baef5c23f0
record_format	dspace
spelling	oai:doaj.org-article:3af5e97cf3a94758829bc9baef5c23f02021-11-22T01:10:12ZNumerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement1563-514710.1155/2021/3588868https://doaj.org/article/3af5e97cf3a94758829bc9baef5c23f02021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/3588868https://doaj.org/toc/1563-5147We established an evaluation index of the rock mass stress state for underground coal mines using the strength-stress ratio based on the measured in situ stress and the generalized Hoek–Brown strength criterion. Three in situ stress states, σcm/σ1m < 1.4 (high), 1.4 < σcm/σ1m < 3.6 (medium), and σcm/σ1m > 3.6 (low), were established based on the value of the unconfined compressive strength (σcm) and the maximum principal stress of the rock mass (σ1m). This index classifies the Burtai mine as a medium-high in situ stress field, which is in agreement with the on-site situation, establishing the reliability of the index. The working face was a three-dimensional geological model based on the log sheets. The initial conditions for the model were determined using the combined measurements of the in situ stress regression model. We performed numerical simulations of the roof stress field distribution under repeated mining. Mining the overlying coal seam leads to significant variation in the value and direction of the main roof, σ1, within the range of the front abutment pressure under the pillar and gob. Along the main roof strike direction, σ1 under the pillar is 1.5 times that under the gob, and the σ1 direction under the pillar is deflected by 5°, which is 30° smaller than that under the gob. This provides a reference for optimized underground coal mining.Donghui YangBohu YangZhaoheng LvYongming LiHongming ChengZhangxuan NingHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040MathematicsQA1-939ENMathematical Problems in Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040 Mathematics QA1-939
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Mathematics QA1-939 Donghui Yang Bohu Yang Zhaoheng Lv Yongming Li Hongming Cheng Zhangxuan Ning Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
description	We established an evaluation index of the rock mass stress state for underground coal mines using the strength-stress ratio based on the measured in situ stress and the generalized Hoek–Brown strength criterion. Three in situ stress states, σcm/σ1m < 1.4 (high), 1.4 < σcm/σ1m < 3.6 (medium), and σcm/σ1m > 3.6 (low), were established based on the value of the unconfined compressive strength (σcm) and the maximum principal stress of the rock mass (σ1m). This index classifies the Burtai mine as a medium-high in situ stress field, which is in agreement with the on-site situation, establishing the reliability of the index. The working face was a three-dimensional geological model based on the log sheets. The initial conditions for the model were determined using the combined measurements of the in situ stress regression model. We performed numerical simulations of the roof stress field distribution under repeated mining. Mining the overlying coal seam leads to significant variation in the value and direction of the main roof, σ1, within the range of the front abutment pressure under the pillar and gob. Along the main roof strike direction, σ1 under the pillar is 1.5 times that under the gob, and the σ1 direction under the pillar is deflected by 5°, which is 30° smaller than that under the gob. This provides a reference for optimized underground coal mining.
format	article
author	Donghui Yang Bohu Yang Zhaoheng Lv Yongming Li Hongming Cheng Zhangxuan Ning
author_facet	Donghui Yang Bohu Yang Zhaoheng Lv Yongming Li Hongming Cheng Zhangxuan Ning
author_sort	Donghui Yang
title	Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
title_short	Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
title_full	Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
title_fullStr	Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
title_full_unstemmed	Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
title_sort	numerical simulation of the stress field in repeated mining of coal seams based on in situ stress measurement
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/3af5e97cf3a94758829bc9baef5c23f0
work_keys_str_mv	AT donghuiyang numericalsimulationofthestressfieldinrepeatedminingofcoalseamsbasedoninsitustressmeasurement AT bohuyang numericalsimulationofthestressfieldinrepeatedminingofcoalseamsbasedoninsitustressmeasurement AT zhaohenglv numericalsimulationofthestressfieldinrepeatedminingofcoalseamsbasedoninsitustressmeasurement AT yongmingli numericalsimulationofthestressfieldinrepeatedminingofcoalseamsbasedoninsitustressmeasurement AT hongmingcheng numericalsimulationofthestressfieldinrepeatedminingofcoalseamsbasedoninsitustressmeasurement AT zhangxuanning numericalsimulationofthestressfieldinrepeatedminingofcoalseamsbasedoninsitustressmeasurement
_version_	1718418333889462272

Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement

Ejemplares similares