The Einstein Telescope will be a gravitational wave observatory comprising six nested detectors, three optimized to collect low-frequency signals, and for high frequency. It built few hundred meters under Earth’s surface reduce direct seismic Newtonian noise. A critical issue with the design are corner stations, each hosting at least one sensitive component of all detectors in same hall. Mainte...

To investigate a new method which can reduce hazard distance by accidental explosion in underground ammunition storage facilities, several hazard reducing devices were reviewed. And the portal barricade in front of the portal was one of the IBD reducing devices studied. To investigate the effectiveness of portal barricades, a series of tests were conducted with concave shape portal barricades. ...

Magnetic resonance sounding (MRS) using the Earth's magnetic field is a noninvasive and on-site geophysical technique providing quantitative characteristics of aquifers in the subsurface. When the MRS technology is applied in a mine or tunnel for advance detecting the source of water that may cause disastrous accident, spatial constraints limit the size of coil sensor and thus lower the detecti...

INTRODUCTION Beijing subway line 14 includes four stations and approximately 2.8 km of tunnels between the Dongfengbeiqiao and Jingshunlu areas of the city. Due to the surface and underground space limitations of this section, a double-track running tunnel instead of two single-track running tunnels was adopted to connect the two stations. The double-track tunnels were excavated by a 10.22 m di...