Analysis on Cutter Head Design of Shield Machine in Complex Strata
With the rapid development of urban subway construction in China,shield tunneling machine is widely used.China is a vast country with different engineering geological and hydrological conditions in different regions and cities.Even the working conditions in different sections of the same city may vary greatly.If the cutter head design of shield tunneling machine is not reasonable,the cutter head will bear strong impact in the process of tunneling,and the whole shield tunneling machine will produce violent vibration,and the cutter head may have partial wear,chipping,bearing damage and other failure forms,thus causing a series of difficult problems and affecting tunneling efficiency.In order to solve the problems such as cutter spacing arrangement,Cutter Head Structure Analysis,cutter head function optimization and so on,which are faced with in the design of extra large diameter shield cutter head in complex subsea stratum,based on the engineering geology and hydrologic characteristics of a Gulf tunnel,this paper analyzes the working conditions of shield driving through the soft soil stratum of the whole section,the soft soil stratum invaded by boulders and the stratum of the base rock protuberance.The engineering application shows that the structure strength and rigidity of the cutter head meet the requirements,the cutter spacing design is reasonable,and the cutter head optimization measures enhance the adaptability of the shield in silt and soft-hard uneven stratum of the seabed,it can provide a certain reference for type selection and design of shield in similar complex subsea strata.
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