Research On Dachuan Tunnel Construction Technigue Of TongDan Highway

This paper take the example of DaChuan Tunnel and described thoroughly all aspects and problems of tunnel construction in Northeast region that should be noticed , and make a comprehensive summary to the difficult problems of tunnel construction in Northeast region, at the same timeelaborate the principles with reference of construction .As the reasons for temperature of the North East region , there are some big differences between tunnel construction and high temperature region . The determination of excavation method has important significance for the stability of tunnel , Structural support also has the extremely vital role to the Overall stability of tunnel , in addition , the climate of Northeast region is relatively cold , freezing and thawing Repeatedly will cause the defects of tunnel concrete cracking and water seepage , so Drainage is the top priority of this region.This paper summarizes and researches the measure theory, and educe the conclusion with monitoring data of DaChuan tunnel. This paper calculates heating methods and thermal power of Portal Construction in detail , proposes heating measures must betaken and the appropriate temperature of Tunnel construction in winter.This paper researches and analyzes the key issues that should be attention in the process of tunnel construction, and analyzes each process in detail. The dissertation consists of five chapters.The second chapter and the fouth chapter are emphases of this dissertation ,there into second and fouth chapter is hard-core.The first chapter of the object, this paper studies the significance of research and study. For tunnel construction to research problems and content of Dan, highway tunnel, mountains of tunnel construction development at home and abroad is summarized the new Austrian tunneling method widely used for the construction of the tunnel provides a solid theoretical foundation. In addition to the application, make integral trolley two lining construction, and to ensure a more rapid lining quality. A modern tunnel construction. Since the use of pipe roofs, solve the problem of weak loose soil drilling, thereby better guarantee the quality and safety of construction of imports. For research content.The second chapter introduces research From the first chapter of the key tunnel excavation of the gradual excavation method to determine the level of surrounding rock, according to the different structure characteristics and the whole section by excavation method and steps excavation and CD method excavation. In the special geological conditions and the situation of the excavation way that using the overall structure of tunnel safe and stable. As for the effect of excavation blasting decisive factors to do a detailed analysis of the design. In blasting parameters, structure, and sequence of blasting cutting form etc. Carried on the earnest analysis. In the research on the basis of the excavation and supporting of tight after work are analyzed, the recognition of the ability of stability of surrounding rock from the necessity of early support.Another part of this chapter in northeast China is the most important for tunnel construction of drainage gives a detailed analysis, structure and construction waterproof and drainage from the two aspects of waterproof and drainage carefully studied, especially for the cause of leakage tunnel waterproof and drainage system structure of comprehensive analysis.The third chapter for lining construction monitor and measure is studied systematically. Tunnel monitoring measurement is "new Austrian tunneling method" construction, is one of the three pillars of safety, scientific construction is the important means of geological condition, the construction of master, supporting condition wallrock deformation matters such as the means and change, thus achieved the preventive measures, accidents landslides timely adjust construction scheme.The fourth chapter in northeast China, due to the climate for tunnel construction quality. To adopt necessary measures to ensure the heated greenhouses in tunnel construction are allowed temperature range, to ensure the safety of the structure and the using life. Therefore for winter tunnel construction of mountains and the calculation method of heating mode analysis.The fifth chapter is full of papers, namely the completion of the work process are summarized, and put forward in work will continue to study the content and direction.