TBM techniques for excavating large-section rock roadway in the deep high-temperature coal mines:A case study of Xinkuang No.1 TBM

In China,many coal mines have entered a deep mining stage and are facing the imbalance problems between coal mining and roadway excavation.Tunnel Boring Machine (TBM) has been widely implemented in some sallow coal mines because of its high intelligence,safe operation and high driving efficiency during excavation.However,this TBM method is rarely tried to be used in deep high-temperature coal mining systems.Therefore,to study the intelligent TBM tunneling technology and promote the intelligent mining level of deep coal mines,the authors firstly introduce the geological conditions of Xinjulong coal mine and then take the large-section intelligent TBM system as an example to illustrate some key technologies during the TBM excavation.This system integrates some key technologies,such as tunneling,slag discharge,supporting,dust removal,ventilation,cooling,guidance,explosion-proof,and anti-scouring.It has realized the intelligent tunneling of roadways with a diameter of 6.33 m,automatic bolt supporting during tunneling,parallel tunneling and support and other key technologies.Based on this background,some key technologie are introduced which include:① Building mode of TBM for rocks in deep high-temperature coal mines;② The large depth,long-distance transportation and installation technology of large-size TBM components;③ Intelligent boring techniques by using TBM;④ The stability control method of extra-large installation cave and large-size TBM roadway in deep coal mines and ⑤ Comprehensive security technology for TBM intelligent excavation in deep high temperature and high in-situ stress coalmines,including:geological disaster prediction,cooling,dehumidification,dust reduction,etc.This study aims to discuss the development and application processes of the Xinjulong TBM,thus putting forward the difficulties and solutions during its operation.Moreover,this study could provide some experience and technical references for similar coal mines to use TBM in hard rock roadway,so as to facilitate the comprehensive understanding of the technology and improve the intelligent level of rock roadway development.