ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the construction of railways in western part of China, more and more long tunnels havebeen excavated these years, and several ones are under construction at the moment. Because of thecomplex geologies like faults, fractured zones, karst cavities as well as water bearing formations, thestability and safety of tunnels have been challenging topics in the construction process. In this regard,the advance knowledge of the location, size, and spatial information of the uncertainties ahead of theface is very important to the contractors. In this paper, by using the Tunneling Seismic Prediction(TSP) technique, site experiments are performed to predict hazardous formations ahead of face in arailway tunnel. Through interpretation of the testing data, the wave velocities and the mechanicalparameters of the surrounding rock are obtained, and the faults/fractures are recognized. The studyshows that compared to time-consuming core drilling method, the wave reflection based TSP methodcan predict major uncertain formations in long range ahead of the face in short time. The downtime, aswe know, is one of the key factors in speeding the tunnel construction. For the prediction accuracy, theTSP technique is able to provide enough information due to its multiple proof-test procedure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.461.pdf
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