Analysis On The Deep Foundation Pit Supporting Project Of Yinghui Road Building In Chengdu

The deep foundation pit of yinghui road buliding is located in NO6, Yinghui Road, Chenghua district of Chengdu, the south adjacent shudu avenue and the west near sha river, the foundation pit shape is L form with the perimeter of1200m and a total area of about30000m2, the depth from5.08m to19.69m. The foundation pit near around even though not tall buildings and other major facilities, but the west side is the municipal road, and the south had an old landslide development. Therefore, according to the study on the degree thesis support plan, deformation and stability state. In the following essay for the research work, the research results obtained the following:(1) On the base of collecting the geological survey for the material basis of foundation pit and analysising the existing geotechnical engineering problems summarized, the results show that the foundation pit deformation and stability of the expansion pits wall is the main geotechnical engineering problems of the foundation pit.(2) According to the survey data of the strata structure and referencing the traditional processing method, by using the physical and mechanical properties of all, the shear and the effect moment of structure function, the surface distribution scope and the torque peace section thickness distribution, subsection equivalent simplification. The plane will be divided into six section, scope of foundation pit in section simplified as5to7layers, respectively established the foundation pit theory analysis model and numerical calculation model, the foundation pit and determine the soil pressure. The established model conforms to the analysis and calculation of the foundation pit of the macro characteristic geotechnical.(3) According to the characteristics of foundation pit and the supporting technology, using theoretical analysis of foundation pit supporting scheme of subsection the argument, to determine the foundation pit supporting each better scheme, where the north side, the south and the east are given priority to put slope and soil nail illustr scheme, the west side uses the anchor pile support plan.(4) According to the support scheme determined to paragraphs of the support structure, internal (local) stability and external stability of the sliding resistance, resistance to overthrow, basal bearing capacity and internal structure are cayyied out the design calculations, the results show that according to recommend the design scheme and the parameters can satisfy the requirements specification.(5) According to the foundation pit simplified geotechnical engineering analysis model, using the numerical analysis pit wall deformation and stress field and state support for the analysis of structural internal force, and the results showed that the foundation pit wall at the top of the maximum horizontal displacement of9.17mm, maximum vertical displacement of9.32mm, foundation pit bottom uplift the maximal displacement of6.26mm, surrounding the maximal displacement of foundation pit settlement of10.87mm, meet the requirements of the foundation pit excavation monitoring. The greatest of retaining piles for normal stress (?)+max=6.0x106N/m2,(?)-max=4.5x106N/m2, and meet the requirements of the design, structure.(6) This research results can be used as the reference for the design of foundation excavation.