doi:10.16186/j.cnki.1673-9787.2020100016

Received:2020/10/10

Revised:2021/01/27

Published:2021/07/15

Analysis on influencing factors of stability of anchorage bearing structure of roadway under dynamic load

JIAO Jiankang1,2,3

1.Coal Mining Research Institute， China Coal Technology Engineering Group ， Beijing  100013 ， China;2.Coal Mining and Design Department， Tiandi Science & Technology Co. ，Ltd. ， Beijing  100013 ， China;3.Coal Mining Branch ， China Coal Research Institute， Beijing  100013 ， China

Abstract:In view of the complexity of the failure mechanism and the diversity of the influencing factors of the anchoring surrounding rock in the rockburst roadway， based on the experimental design and data analysis function of response surface method， the deformation law and failure mode of the anchorage bearing structure under the influence of single factor and multiple factors， such as surrounding rock strength， microseismic source distance from its position to roadway， microseismic source strength， initial rock stress and support strength， were quantitatively studied by using the finite difference numerical software dynamic module. The results showed that the interaction of single factor and multi-factors had significant influence on the deformation of anchorage bearing structure， and the order of single influencing degree was ： surrounding rock strength ＞ microseismic source strength〉microseismic source distance〉initial rock stress〉support strength. By increasing the microseismic source propagation distance， increasing the dynamic load attenuation coefficient， improving the support strength， increasing the surrounding rock self-bearing capacity， or reducing the static load stress concentration， the deformation of the anchorage bearing structure of rockburst roadway could be effectively reduced. The failure modes of roadway anchorage bearing structure under the condition of multi-factors combination could be divided into bolt fracture type， anchorage debonding type， rock mass dominant type and composite type. According to different failure modes， herarchical and differentiated control technologies including“ full-length prestressed support with high impact and toughness anchor” ，"ternal anchoring internal grouting ” and " deep surrounding rock pressure relief-shallow surrounding rock strong support-roadway surface protection“ were put forward. The research results could provide a theoretical basis on the stability control of ahchorage bearing structure of rockburst roadway.

Key words:rockburst;dynamic load;anchorage bearing structure;response surface method;numerical simulation

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