首页|Types and occurrence time of rockbursts in tunnel affected by geological conditions and drilling & blasting procedures
Types and occurrence time of rockbursts in tunnel affected by geological conditions and drilling & blasting procedures
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NSTL
Elsevier
? 2022 Elsevier B.V.Rockburst is a difficult problem that restricts the development of deep rock mass engineering technology, and the warning of rockburst occurrence time remain a common challenge worldwide. This paper presents geological information and rockburst occurrence time in different drilling & blasting procedures collected in detail from a deep tunnel. A characterization method of MS (Microseismic) sequences has been designed to characterize the evolution law of microseismicity in the blasting cycle. An LSTM (Long Short-Term Memory) model is established to construct and augment the MS sequence samples, and a database was established based on information such as geology, excavation, support, MS sequence, and rockburst. Based on the information in 600 blasting cycles of the database, a multisource data mining method for analyzing the MS sequence formation mechanism is established. The relationship between the characteristics of rockburst occurrence time and MS sequence is established, and the formation mechanism of the MS sequence is used to interpret the potential rockburst type and occurrence time affected by geological conditions and drilling & blasting procedures. The results show that the number and spacing of structural planes have an important influence on the frequency, intensity and type of rockbursts. Rockburst may occur in each procedure of the blasting cycle. The frequency of rockburst during the danger elimination and support stage is the highest, during the drilling and charging blasting stage is the lowest. The MS sequence in blasting cycle is divided into four types, which have a good relationship with the rockburst occurrence time in blasting cycle procedures. Rockburst type and occurrence time in different procedures is mainly controlled by the rock mass structure, excavation footage, excavation rate and blasting time interval. The results have important reference value and guiding significance for rockburst time warning and hazard control.
Blasting cycleDrilling and blasting proceduresMicroseismic sequenceRockburst occurrence timeRockburst typeStructural plane
Niu W.、Feng X.-T.、Yao Z.、Bi X.、Yang C.、Hu L.、Zhang W.
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Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern University
NSTL
Elsevier
