Study On The Settlement Of Surrounding Soils Caused By Deep Foundation Pit Excavation

With the rapid development of construction technology and equipment,the scale of the deep foundation pit engineering is also rising greatly.This thesis introduces a numerical analysis of the actual project monitoring data by using the ABAQUS finite-element method combining with the engineering example of excavation and supporting of deep pit in Yuebeiyuan and Shimao,Changsha.The key point of this thesis lies in the research of the settlement and displacement of surrounding buildings caused by the in deep foundation pit excavation.The main research achievements are as follows.At first,this thesis points out several common types of deep foundation pit excavation which may cause damage to the surrounding buildings and introduces its calculation models.What’s more,this thesis is based on the monitoring data to give a systematic and overall analysis of deep foundation pit engineering from these three basic monitoring contents;they are the horizontal displacement of the top of the pit,crown settlement,and building settlement.Last but not least,in this thesis,the settlement and displacement of surrounding buildings caused by the deep foundation pit excavation in Yuebeiyuan and Shimao,Changsha is simulated by finite element method.And on the application of Mohr model,the influences on the foundation pits in excavation including engineering geology,hydrologic geology,shields of foundation pits and surrounding buildings are investigated.Then this thesis gives a comparison between the displacement data obtained from the finite element simulation and the measured data.The results indicate that the deformation law of the two are roughly the same.Finally,conclusion of the research work of the whole text as well as the future development of the study direction are presented.