Rock burst risk evaluation based on equivalent surrounding rock strength
|نوع نگارش مقاله||
scopus – master journals – JCR
۴٫۲۷۶ در سال ۲۰۲۰
۲۶ در سال ۲۰۲۱
۰٫۹۰۱ در سال ۲۰۲۰
|شاخص Quartile (چارک)||
Q1 در سال ۲۰۲۰
خرید محصول توسط کلیه کارت های شتاب امکان پذیر است و بلافاصله پس از خرید، لینک دانلود محصول در اختیار شما قرار خواهد گرفت و هر گونه فروش در سایت های دیگر قابل پیگیری خواهد بود.
فهرست مطالب مقاله:
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:|
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 . 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 .
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 . 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 .
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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