Application Of Comprehensive Geological Survey In Sandu Tunnel Of Guiyang-Guangzhou Railway Line

In this paper,it mainly introduces the application of comprehensive survey method of long tunnels in complex geological conditions.As an effective way to solve problems in complex tunnel exploration,it is used with the best mode of combination of the aerial photo interpretation,field engineering drawing,comprehensive geophysical exploration,drilling,comprehensive logging,special research and other methods.And it also introduces the achievements of the comprehensive survey method in detail with the example of SanDu tunnel survey in GuiGuang railway.According to the investigation processes of the tunnel,firstly,it descripts the basic conditions of the tunnel,and then introduces several major problems needed to be solved in geological investigation and its guiding work for the follow-up work.Secondly,it introduces the application of geological drilling in tunnel survey from the aspects of the purpose,function and arrangement principle,and introduces the specific drilling arrangement of Sandu Tunnel.As supplements to the geological investigation and drilling results,the field comprehensive geophysical prospecting method are used to know more about the engineering geology and hydrogeological conditions of the tunnel.With the special hydrogeological work,the zones of water inrush and the water inflow can be analyzed qualitatively and quantitatively,which also provides specific location and range for the prevention work in tunel design and construction.More accurate geological parameters can be obtained by carrying out various tests in deep holes.The experiences should be summarized for better meeting the high standard requirements of railway survey,and improving the quality and efficiency of tunnel survey.And it is also important for providing more accurate geological data for design and construction,guaranteeing the safety in construction,and reduceing the risk in construction.