Boring is a frequently employed finishing operation in machine shops. Boring is a process in which pre-drilled holes or holes in cast, forged or extruded components are enlarged or finished with a cutting tool mounted on a boring bar. The process is mostly used in applications where close dimensional tolerances and good surface finish are required. In this research work based on the theoretical...

Tunnel construction is a complex technology, with huge number of effective parameters, which cannot be accurately analyzed/designed using empirical or theoretical methods. With the rapid development computer technologies, Soft Computing (SC) approaches have been widely used in tunnel construction. Typically, two common tunneling methods, blasting and mechanical excavation ( e.g ., boring machin...

Mechanical methods of tunnel excavation are widely used because their high output, and the selection appropriate technology depends on ground composition project-related features. Compared with boring machines (TBMs) roadheaders, mechanical pre-cutting in widening have proven to be reliable capacity expansion. other machines, characteristics not systematically analyzed rare use. In this study, ...

Tunnel Boring Machines (TBMs) are widely used for tunneling in urban areas because of their high advance rate, precise as-built profile and minimal impact to buildings and traffic on the ground. For a tunnel built by a TBM, there are strict requirements on alignment control and safety. To meet these requirements, it is important to monitor the position of the TBM. In the current practice, the T...

The development of underground spaces in urban centers has attracted significant research attention. Typical excavation methods for areas include the New Austrian tunneling method (NATM) and tunnel boring machine (TBM). NATM is superior terms ease construction economic efficiency; however, vibration noise are often cited as major complaints. In addition to their high initial cost, TBMs require ...

This study is aimed at investigating the excavation damage characteristics of surrounding rock in Jinping deeply buried marble tunnels, China. According to acoustic detection results tunnel cross-sections under condition boring machine (TBM) obtained on site, PFC microscopic parameters Types II/III were simulated and calibrated through PFC2D program. In doing so, deeply-buried sections diversio...

Abstract The mud cake is easily formed during the tunnel boring machine (TBM) excavation in clay soils or rocks containing minerals. Mud will lead to soil disturbance of face, clogging cutterhead and even affect construction efficiency personnel safety. In this study, a discrimination method formation based on temperature was proposed. An online monitoring system designed installed slurry balan...

In tunnel construction projects, delays entail high costs. Thus, boring machine (TBM) operators aim for advance rates without compromising safety, a difficult mission in uncertain subterranean environments. Finding the optimal control parameters based on TBM sensors' measurements remains an open research question with significant practical relevance. this paper, we present intelligent decision ...

At present, the replacement of disc cutters tunnel boring machine (TBM) is a very important and difficult manual operation. It meaningful to study TBM with robot. In this paper, machining assembly deviation new integrated cutter developed by our research group modeled analyzed using improved Jacobian–Torsor model, analysis results are verified experiments. On basis, aiming at possible radial an...