Study On The Influence Of Excavation And Supporting Process Of Local Bedding Foundation Pit On Existing Buildings

At present,the speed of infrastructure construction in China is accelerating day by day,the urban supporting facilities are in short supply,and the urban land is also becoming increasingly tight,so a large number of foundation pit projects are produced.In southwest China,thanks to its special geological conditions,underground space develops rapidly,and more and more foundation pit projects appear.In some districts and counties,the number of them has reached hundreds.In the construction process of these foundation pits,most of the rock strata excavated are sedimentary rocks,and there are a lot of rock strata whose tendency is consistent with or nearly consistent with the slope trend,that is,the consequent rock foundation pits.Usually in many local encountered in the construction of foundation pit excavation slope bedding,this kind of foundation pit is not only its own stability is poorer,and the damage is more likely to occur when the excavation,with the consequent landslide may result from or consequent the revival of the ancient landslide and data from a large number of engineering practice,especially in the rock slope bedding rock slope are most vulnerable to damage.Taking the foundation pit slope engineering project of Group B of Chongqing Sunshine 100 International New City as an example,the theoretical analysis combined with numerical simulation software is used to study the local bedding foundation pit,and the deformation,stress and influence of the surrounding bedding are analyzed.The influencing factors such as the depth of foundation embedding,the load of the upper building and the distance between the foundation and the foundation pit are discussed.Through the comparison of different support schemes,the best support scheme is proposed.The main work done in this paper is as follows:(1)Through the geological structure characteristics,slope stability calculation and deformation characteristics of foundation pit slope,the rock mass engineering characteristics of the local bedding foundation pit are analyzed,and the local bedding rock mass to the foundation pit slope is discussed.influences.(2)Using FLAC3 D numerical simulation software to simulate the excavation and support process of the local bedding slope,analyze the deformation of the foundation pit,the deformation of the building foundation,and the influence on the upper building structure,combined with the relevant specifications for the upper structure.Considerand verify the rationality of the current norm calculation.(3)Through the influence analysis of different foundation embedding depth,upper building load and foundation and foundation pit distance,the basic internal force and deformation law of foundation pit excavation are obtained.(4)Through the comparative analysis of the deformation and foundation deformation of the foundation pit under the support of the anchor retaining wall,the prestressed anchor retaining wall and the retaining wall of the pile retaining wall,the optimal supporting scheme is proposed for the foundation pit and the building foundation.The deformation control has certain engineering guiding significance.