Abstract Bener Dam Diversion Tunnel is located in two rock units such as andesite and breccia. Based on the engineering geology investigation, subsurface tunnel will penetrate breccia with good mass quality (fresh-moderately weathered), while surrounding consist of breccias moderate poor quality. Geological conditions are used basis for stability analysis excavation methods determining primary ...

Tunnel construction method using a tunnel boring machine (TBM) is commonly adopted for building underground infrastructure, such as railways, roads, sewers, or utility pipelines. TBM tunnelling entails precise guidance of the machine in the underground space, as well as effective construction management and project control. The research aims to address critical engineering and management proble...

Field-cycling NMR in the solid state at low temperature (4.2 K) has been employed to measure the tunneling spectra of methyl (CH3) rotors in phenylacetone and toluene. The phenomenon of tunnel resonance reveals anomalies in (1)H magnetization from which the following tunnel frequencies have been determined: phenylacetone, νt = 6.58 ± 0.08 MHz; toluene, νt(1) = 6.45 ± 0.06 GHz and νt(2) = 7.07 ±...

Abstract Microtunnelling is an excavation technique capable of positioning underground pipes with considerable advantages from the point view environment, safety, construction times and also total costs, when lengths are significant. The technology used now reliable suitable for use in different types soils rocks without particular problems. installation concrete lining micro-tunnel takes place...