Deformation Control Technology for Initial Support of Large-section Loess Tunnel
Due to the changeable geology and complex stress of loess,the surrounding rock disturbed by tunnel construction is prone to settlement and deformation,re-sulting in tunnel deformation and collapse accidents,which brings safety risks to tunnel construction.In order to deal with such risks,this paper relies on the S36 Lintao-Kan-gle-Guanghe Expressway Xiangshan Tunnel engineering,through the three-bench reserved core soil temporary in-verted arch method,the upper and lower bench reserved core soil method,the single side wall construction method and the setting of surrounding rock stress release device method and other construction schemes,to explore the solutions to the problems of initial support deformation and cracking in different geological excavation and sup-port construction.Through practice,all four construction techniques can effectively control the initial support defor-mation,and the feasibility of setting the surrounding rock stress release device method is higher.
large sectionloess tunnelinitial supportdeformation control
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