عنوان مقاله [English]
Considering traffic congestion in mega cities, the need to construct urban tunnels is inevitable. The reciprocal effect of tunneling-induced ground settlement and surface buildings is an important factor during shallow tunneling design procedures in urban areas. Hence, the effective factors in this reciprocal relationship need to be appraised prior to the construction phase. In this paper, the major characteristics of buildings have been numerically simulated using 3D finite element approach. It has been demonstrated that weight and length of buildings have shown parallel correlation with surface settlements. However, building width have had reverse trend with surface settlements.
The main purpose of this research is the study of influence of building weight and geometry on the surface settlement due to sequential excavation method, and interaction between the building and tunnel. It has been investigated by simulating systematic construction process of the tunnel using finite element numerical method.
Methodology and Approaches
In this paper, the major characteristics of buildings have been numerically simulated using 3D finite element method. In addition, the results of study on the field data of the Nyayesh tunnel are presented.
Results and Conclusions
The results have proved that the existence of surface buildings has reciprocal effects on ground settlement troughs. The increase of the building weight will result in increase of surface settlements. On the contrary, by ignoring building weight, presence of surface building foundations will cause a less settlement compared to the green field condition which is due to increase of the rigidity of building foundation and thereby ground improvement. The increase of building width reduces the surface settlements, and the increase of the building length leads to more surface settlement, although the building width is a more effective parameter, which controls the overall tunneling-building interaction behavior than the building length. Thus, building weight and geometry effectively influence the surface settlements troughs in urban tunneling.