A tunnel boring machine (TBM) is an important large-scale engineering machine, which widely applied in construction. Precise cutterhead torque prediction plays essential role the cost estimation of energy consumption and safety operation tunneling process, since it directly influences adaptable adjustment excavation parameters. Complicated variable geological conditions, leading to operational ...

To explore the influences of microwave irradiation on rock-breaking efficiency tunnel boring machine (TBM) cutters, a multimode cavity with power 2100 W was used to conduct tests Chifeng basalt for different durations. A combined abrasion test device reduced-scale SP3-I TBM cutter adopted wear and samples before after irradiation. Influences loss cutter, rock removal, cutting force, specific en...

Changing the cutter is an essential procedure in tunnel boring machine (TBM) operations. The danger and low efficiency of manually replacing disc has led engineering equipment designers to study technologies automate changing cutters. key step design a new integrated (simplifying replacement process) facilitate robot operation. Until now, research systems mainly relied on inspiration. In this p...

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...

The operation data of a tunnel boring machine (TBM) reflects its geological conditions and working status, which can provide critical references essential information for TBM designers operators. However, in practice, may get corrupted due to equipment failures or management errors. Moreover, the state system usually changes, results patterns that vary comparatively. This paper proposes denoisi...

Inter-specific interactions are important drivers and maintainers of biodiversity. Compared to trophic and competitive interactions, the role of non-trophic facilitation among species has received less attention. Cavity-nesting bees nest in old beetle borings in dead wood, with restricted diameters corresponding to the body size of the bee species. The aim of this study was to test the hypothes...

A classical example of chatter prone machining is the boring operation. Turning under conditions with high vibrations in the cutting tool deteriorates the surface finish and may cause tool breakage. Severe noise is also a consequence of the high vibration levels in the boring bar. Active control is one possible solution to the noise and vibration problem in boring operations. In boring operatio...

and an increased chlorophyll b to chlorophyll a ratio for better light capture in low light. Furthermore, an Ostreobium strain living in a coral skeleton, where nearly all of the red light has been captured by the zooxanthellae in the coral tissue, has been shown to have modified chlorophyll with a spectrum shifted towards far-red wavelengths. As zooxanthellae cannot use far-red light, more of ...

The T26 tunnel was designed within the scope of Ankara-Istanbul high-speed railway in accordance with speed 250 km/h. Some serious problems and excessive deformations were encountered during excavation works. caused subsidence on surface Tunnel Boring Machine (TBM) became stuck; therefore, works suspended. Design for re-excavation extracting TBM carried out re-designed by New Austrian Tunneling...