Flac3D-based Deep Pit Second Reinforcement Support Numerical Simulation Analysis And Research

Followed the modernized city swift and violent development,the surface space gradually already is being unable to satisfy humanity's production life unceasingly to request well.The underground space by its confidentiality,the reliability,as well as many superiority let the people start to enlarge speeds up to the underground spatial use.The rapid development of underground space effectively promoted the development of the engineering pit,deep pit the development direction of the Agency into a larger scale and more depth.Foundation pit is as safe auxiliary tool during the construction,and foundation pit engineering is also a variety of complicated factors influence each other systemic engineering,geotechnical,structure and construction technology of overlapping project,the uncertainty,complexity.Economy,efficiency and safety of foundation pit supporting design scheme is to ensure that the premise of construction smoothly.But often the unreasonable supports and protections plan and the system,as well as not correct job practice and so on factors often can cause the entire project the defeat even to initiate more secure questions,creates the economical the loss and personnel's damage.So for foundation pit accident can effectively prevent and governance is the important guarantee of normal construction is completed,the excavation of the secondary reinforcement design research becomes the important lesson that we need to study now.This article based on the Chaoyang District Beijing China center project deep pit support,engineering,through the deep pit support,design principles and damage analysis governing deformation mechanisms in conjunction with Huadu center project deep pit support,design and construction of the profile of the analysis in the construction process in the pit deformation and damage,research and design a rational and effective pit second reinforcement flac3 d programs with the numerical simulation of Deep Pit methods,and establish and reinforce the support,the value model,for its stability for simulation analysis and evaluation,the preferred safe and reasonable pit reinforcement support program.The obtains the main achievement to be as follows:(1)This article analyzes the deep pit support,design works and undermine the deformation,while pit deformation control and reinforcement measures support,research was carried out,and summarizes the common deformation of the control measures and the reinforcement support method.(2)This article provides an overview of Huadu center deep pit support,project profiles,pit support,design and pit deformation monitoring programs,and the focus of monitoring of regional pillar top shift detection analysis the results.(3)Studies the hole excavated for building foundation accident which in the Huadu center project construction appears,the reason which the analysis accident occurs.For the kunlun apartment on the south side of foundation pit deformation and ground subsidence problems,research and develop the two sets of reinforcement scheme:(1)Suspension beam+Brace+Interior bracing and(2)The soil curing+Slope protection pile to pull;In view of the art gallery of south slope instability,anchor beam waist fall off problems,study and formulate effective reinforcement scheme by The soil curing+Adding anchor+Interior bracing program scheme project.(4)Using Flac3 D numerical simulation analysis,the stability of the kunlun apartment on the south side reinforcement scheme for simulation analysis,through the establishment of two sets of support,design the three-dimensional model,and from the pit total displacement,plastically deformed and shear strength to increment the simulation calculation,taking into account the results of the simulation as well as integrated actual construction,the finalization of the use of the soil curing+Slope protection pile to pull program to deal with the pit,secure,and efficient,economic and reasonable.