Interface mechanics of soil-metro tunnel on ground fissures

摘要

Ground fissures that are typical geo-hazards in Xi'an area may cause damage of various types of buildings, transportation facilities, city lifeline projects and resources, especially endangering the construction and running of Xi'an Subway. During ground fissures activity, mechanical characteristics of interface between stratum on fissure zones and metro tunnel are more complicated than that of normal foundations. Ground fissures in Xi'an area were introduced firstly, and models of land deformations and section destroy were found around Xi'an subway. Secondly, based on the interface mechanics, mechanical characteristics of interface between stratum on fissure and metro tunnel are studied, and void underneath of metro tunnel are were analysed emphatically. At last, the result of numerical simulation shows that distribution law and amount of frictional force, scale and location of void underneath, influence deformation and stress of tunnel; and then it also provides a theory basis for effective forecast evolution process of void underneath.