Selecting suitable solution and integrated mine-surveying technologies for serving tunnel driving with oncoming working faces in Ha Long underground coal mine

Abstract

During the construction and expansion of mines, in order to increase the area of driving tunnels and save time, the driving method by heading oncoming meeting working faces is often applied. Alignment of the orientation of tunnel driving of oncoming heading faces is an important work that requires choosing appropriate technical solutions and equipment. Any errors, mistakes or inappropriate technological solutions that do not give enough accuracy will cause that two oncoming faces do not meet each other, then causing production delays, loss of moneys and even deadly danger. This article introduces the results of selecting appropriate, optimal technological solutions and equipment that have ensured the success of the construction process of tunnel driving by two oncoming opposite directions in the Ha Long coal mine with an allowed orientation accuracy of Mp=±0.150 m.