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Application of the Comprehensive Logging Technology in Engineering Investigation of Mountain Taihang Tunnel |
DU Yan-jun |
The Third Survey and Design Institute of China Railway, Tianjin 300142, China |
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Abstract Research purposes: According to the Shitai passenger transportation special line 27.87 km long Mountain Taihang tunnel, the tunnel hole body rock character by the limestone,the dolomite primarily clamps the thin layer angle psephitic marl, the gypsum rock and the secondary paste dissolves the breccia, is in the ground water completely supplies area, the tunnel construction zone fracture structure more growth, fault zone and their impact more broken, more groundwater is rich .In geological prospecting phase to identify the tunnel body rocks weathering extent, aquifer and supply relations.
Research methods: Arranging 23 geological drilling hole, choosing the acoustic velocity, the apparent resistivity, the self-potential, the bottom hole thermometer, the inclinometer five logging parameters and borehole televiewer to judges the rock layer, the paper uses the probability statistics methods to carry on the statistical analysis to the test parameters.
Research results: Different variable probability curve with different characteristics, the limestone, the fault breccia, the paste dissolve the breccia relative dispersion to be big, the possibility of large broken rocks to the construction influential. But the politic limestone and the granite-gneiss relative dispersion is small. And the rock has the stave probability to be small. Borehole televiewer is the most direct way to determine groundwater supplies relations.
Research conclusions: The method accurately makes decent the stave degree, the water-bearing stratum and the military supplies relations.
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Received: 07 June 2006
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