Experiences in Mechanized Tunnelling

<a name="OLE_LINK1"></a>In the process of comprehensive mechanized tunnelling in coal mines, forced ventilation is usually adopted to supply air in China. But this ventilation mode could cause the dust rise and diffuse more easily, which has threaten the mine workers’ health seriously. To solve this problem, <a name="OLE_LINK8"></a>dust-removing extraction fan is generally used to suck and purify dusty air in mines. However, the optimal arrangement scheme for dust control is rarely systematically studied. In this paper, we took the tunnel in Donghuantuo Mine as an example and use CFD simulation technology to analyze the dust migration law and dust control effects under different conditions. An unsteady state solution is used to simulate the process and the simulation have realized the visualization of dust migration process with time and the results are as follows. Firstly, it’s better for dust control to <a name="OLE_LINK15"></a>arrange the inlet of the dust-removing extraction fan to the air return side rather than to the center of the tunnel. Secondly, the dust control effects decrease with the distance between inlet of the dust-removing extraction fan and heading face increases. Thirdly, as the amount of air suction is larger than air supply, the dust control efforts would get worse. Field test results are similar <a name="OLE_LINK9"></a>with that obtained from simulation under the optimal arrangement, which proves the reliability of simulation.

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Characteristics and environmental fate of the anionic surfactant sodium lauryl ether sulphate (SLES) used as the main component in foaming agents for mechanized tunnelling

Environmental Pollution ◽

10.1016/j.envpol.2017.04.008 ◽

2017 ◽

Vol 226 ◽

pp. 94-103 ◽

Cited By ~ 37

Author(s):

Anna Barra Caracciolo ◽

Martina Cardoni ◽

Tanita Pescatore ◽

Luisa Patrolecco

Keyword(s):

Anionic Surfactant ◽

Environmental Fate ◽

Foaming Agents ◽

Lauryl Ether ◽

Mechanized Tunnelling ◽

Main Component

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Evaluation of ground information with respect to EPB tunnelling for the Thessaloniki metro, Greece

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.17249 ◽

2007 ◽

Vol 40 (4) ◽

pp. 1986

Author(s):

P. G. Marinos ◽

M. Novack ◽

M. Benissi ◽

G. Stoumpos ◽

M. Panteliadou ◽

...

Keyword(s):

Quaternary Sediments ◽

Red Clay ◽

Quaternary Deposits ◽

Ground Investigation ◽

Mechanized Tunnelling ◽

Tunnel Safety ◽

Reasonable Choice ◽

Control Water ◽

Base Formation

The Thessaloniki Metropolitan Railway comprises two separate ~6 m diameter parallel tunnels with an ~8 km stretch each and 13 stations. The geology of the urban area of Thessaloniki is characterised by the presence of Neogene and Quaternary deposits. The base formation for the project area is a very stiff to hard red clay, dating to Upper Miocene-Pliocene. Upon this formation, Quaternary sediments have been deposited, most of which comprise sand and/or gravel in a clay-silt dominated matrix, covered in places by anthropogenic fill. Ground investigation campaigns incorporated a significant number of sampling boreholes and in situ and laboratory testing. This information was elaborated in order to obtain a better geological understanding and a geotechnical zonation of the ground with respect to mechanized tunnelling. EPB M appears to be the reasonable choice for the project in all aspects of tunnel safety and tunnelling performance. The characteristics and parameters of the soils and the hydrogeological regime directed towards this selection and it is expected that all the objectives, such as settlement and ground movements control, water table level maintenance and adequate performance, will be met by an EPBM provided it is properly operated

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