| The tunnel construction has a great progress with the fast development of China’s highway transportation,In the tunnel construction process,tunnel surrounding rock classification is usually determined before construction through the preliminary investigation or detailed investigations phase,which is a preliminary classification method.Because of the concealment of the rock mass,we’d correct the preliminary classification in the process of construction,and the current specification given tunnel surrounding rock classification parameters of large span,the border of the rock properties is fuzzy. Surrounding rock classification accurate qualitative or quantitative is always the problem faced by the construction and design personnel.The current highway tunnel design code (JTGD70-2004),the classification of surrounding rock parameters directly follows the railway tunnel design specifications of the research results.The applicable objects only for single/double railway tunnel and as such span as double railway tunnel is two lane highway tunnel."Detailed rules for the design of highway tunnel"(JTG/TD70-2010) gives the classification of surrounding rock, but it is according to the situation at that time, according to research of two-lane highway tunnel.The first tunnel surrounding rock classification treatise clearly illustrates the railway tunnel surrounding rock classification of tunnel surrounding rock classification method based on the stability in our country, different stability of surrounding rock excavation span will directly lead to surrounding rock be different.This paper combined with GuangLe road tunnel surrounding rock of their own characteristics, since in a tunnel stability as the foundation, carry on research about three lane long-span flat tunnel surrounding rock and the level of the physical and mechanical index parameters, service for the dynamic design and construction phase of the quantitative dynamic construction safety assessment. Through the GuangLe (GuangZhou to LeChang) high-speed tunnel engineering case, Carry a study on preliminary reinforced three lane tunnel surrounding rock classification rules discussions by adopt literature, numerical analysis, field data collection.①Inquires surrounding rock stability at home and abroad and the surrounding roc k classification as well as literature,got the current scientific classification method and the future development trend of highway tunnel surrounding rock classification,put for ward my own views and research methods.②With the existing surrounding rock classification as the foundation,adopt The discrete element method, Study stability performance of three lane long-span flat tunnel with no reinforcement,Calculate the physical and mechanical parameter combination conditions of the tunnel collapse scope and collapse form.To identify the surrounding rock mechanics parameters and the values of the level which is corresponding with three lane road tunnel.③Refinement of three lane road tunnel primary support parameters④Based on GuangLe road tunnel surrounding rock wich is mainly composed of granite(HuaShan tunnel), sandstone(DaLaShan tunnel),limestone(ZhonsShanDing) of fracture structure.Carry a study on north section of GuangDong about surrounding rock classification and grade index parameter range. |
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