Rock burst risk evaluation based on equivalent surrounding rock strength

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جزئیات بیشتر

انتشار

۲۰۲۱

پایگاه داده

نشریه الزویر

نوع نگارش مقاله

مقاله پژوهشی

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scopus – master journals – JCR

ایمپکت فاکتور

۴٫۲۷۶ در سال ۲۰۲۰

شاخص H_index

۲۶ در سال ۲۰۲۱

شاخص SJR

۰٫۹۰۱ در سال ۲۰۲۰

شاخص Quartile (چارک)

Q1 در سال ۲۰۲۰

مدل مفهومی

ندارد

پرسشنامه

ندارد

متغیر

ندارد

رفرنس

دارد

قوانین استفاده

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توضیحات مختصر محصول
Rock burst risk evaluation based on equivalent surrounding rock strength

فهرست مطالب مقاله:

Abstract

On-site investigations consistently show that the rock burst inherent to coal  seams varies greatly with coal  seam thickness. In  this study, impact factors related to coal  seam thickness and surrounding rock strength were analyzed and a  corresponding rock burst risk  assessment method was constructed. The model reflects the influence of  coal  seam thickness on  the stress distribution of  surrounding  rock at the roadway. Based on the roadway excavation range, a stress distribution model of surrounding roadway rock is established and the influence of coal  seam thickness on rock burst risk  is analyzed accordingly. The proposed rock burst risk  assessment method is based on  the equivalent surrounding rock strength and coal  seam bursting liability. The  proposed method was tested in a 3500 mining area to find that it yields rock burst risk  assessment results as per coal  seam thickness that are  in accordance with real-world con- ditions. The  results presented here suggest that coal  seam thickness is a crucial factor in  effective rock burst risk  assessment.

بخشی از متن مقاله:
  1. Introduction

Constant increases in mining depth and coal  resource intensity in China  has  made impact pressure a serious threat to the Chinese coal  mining industry [1–۴]. The 2016 Coal Mine  Safety Regulations mandate that coal seam rock  burst risk be forecasted appropriately to safeguard coal  mine operations and personnel. The main factors affecting the impact risk  of  the coal  and rock  mass include the properties of the coal  and rock,  geological conditions, and mining technical conditions [5–۱۰].

Many previous researchers have investigated the factors affect- ing  rock  burst risk  and the various methods that may be  used to assess it.  Dou  built a  comprehensive index method to  evaluate impact risk  based on data from previous impact pressure disasters that is weighted based on the effects of various mining and geolog- ical  factors [11].  Rock  burst risk  can  also  be  assessed by  multi- factor coupling index evaluation methods, probability indexes of the main factors that induce impact ground pressure, fuzzy math- ematics methods, or according to  the impact of coal  seam mining stress orientation as the main index. Other scholars have used rat- ings  of the possibility of percussive ground pressure or multi-factor coupling methods which account for  various impact risk  factors

(e.g., mining, geology, coal seam, rock  formation) comprehensively. Different evaluation methods may be  employed according to  the different conditions of  each factor to  demarcate the impact risk area, and ultimately conduct coupling evaluation of all  factors to assign different risk  degrees to  the target region [12].

There have indeed been many valuable contributions to the lit- erature. Zhang established a rock  burst evaluation method based on a geodynamic condition index, where the geodynamic regional- ization method is used to  determine the main influencing factors and their interactions in  terms of geodynamic pressure; the rock stress state analysis system can  be  used to  classify ‘‘dangerous” areas [13].  Scholars have established three bursting liability indica- tors: elastic strain energy index WET, bursting energy index KE, and duration of dynamic fracture DT. Chinese engineers have formu- lated a national standard for the assessment of coal  seam and roof bursting liability given the corresponding parameters for the clas- sification of rock  bursting liability [14,15]. Despite these contribu- tions, there is  no  quantitative rock  burst risk  evaluation method which currently exists; almost no  existing evaluation methods include the  impact of  coal   seam thickness on   rock   burst  risk, though on-site analyses consistently show that it is a crucial factor. Accident statistics consistently indicate that a  thicker coal  seam corresponds to  more frequent and intense rock  bursts. For exam- ple, Polish statistics indicate a six-fold increase in rock  bursts when coal  seem thickness is 4–۸  m  versus 1–۲  m [16].

This study was  conducted to analyze the range of the surround- ing roadway threatened by rock  bursts under typical mining condi- tions.  A  calculation  formula  for   equivalent  surrounding  rock strength was  established to support a novel rock  burst assessment method based on strength and bursting liability index. The method was  tested in an  existing 3500 mining area in a mine to  find  that properly accounting for  the impact of  the coal   seam thickness yields assessment results in accordance with practical conditions.

 

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