The Finite Element Analysis Of Reinforcement And Repair Of The Jet Grouting Reinforcement Method For Damaged And Tunneling Tunnel

Reinforcement and repair of the Jet Grouting reinforcement method for damaged and tunneling tunnel is the first to reinforce the damaged shield tunnel to the affected area with three jet grouting pile, and then vacuum well point dewatering dewatering well, lower the groundwater levels in the tunnel surrounding layout to ensure the safe operation of construction, finally excavation repair, removal and replacement of the damaged segment.Some of the major domestic and international tunnel construction accidents and their analysis and processing methods were collected.To classify the occurrence of major incidents in the tunnel construction.Summed up the tunnel repair of several construction methods, open-cut method,freezing the tunneling method and jet grouting to reinforce the tunneling method.Introduced Shanghai Metro Line11Spur shield tunnel injury cases and preliminary analysis.Including the tunnel damage description and the classification.of damaged segment form.Illustrates the steps of jet grouting to reinforce the construction of the tunneling method repair tunnel.Analysis using finite element software to study jet grouting to reinforce the feasibility of tunneling method to repair the tunnel:1.3D ANSYS finite element analysis of reinforced jet grouting, contrast of settlement distribution of the soil before and after the removal of the segment. There is no change of the soil settlement distribution before and after the Segment removal.This project jet grouting pile can maintain the stability of the dome upper soil well. Analysis of reinforced jet grouting,, the soil stress after tunnel openings. Description of the tunnel surrounding soil physical realization of the basic stability2.3D PLAXIS finite element analysis of reinforced jet grouting, the plastic zone of the top tunnel lining after the segment removal and Stress distribution of the segment, description of after jet grouting reinforcement, the soil reinforcement stability, the segment is in a safe state.Analysis of reinforced jet grouting, Settlement distribution of the soil before and after the removal of the segment. Note after the jet grouting reinforcement,there is no change of ground settlement after segment removal. Analysis of reinforced jet grouting, arch subsoil emission after the removal of the bottom segment, description demolition the end of the tunnel arch standard, arch bottom soil will produce the uplift to the tunnel on upper cover load, maximum uplift about50mm, the safety engineering can be ensure. Analysis of reinforced jet grouting, segment distribution and plastic zone of the soil after soil sedimentation ring removal at the same time, there are no major changes of the Ground Settlement,the plastic zone develop to the jet grouting pile reinforcement.3.2D PLAXIS finite element analysis of reinforced jet grouting, above the dome height from2m to6m change process, plastic zone of the soil is shrinking,plus solid height of6m,tunnel surrounding soil is almost non-plastic region,thus, the project selection Rotary Spraying Pile height of6m is the most appropriate. Analysis of settlement distribution of the soil when the jet grouting pile plus solid height of6m,description plane and finite element computational model results are in agreement, the finite element calculations.Obtained finite element analysis of the conclusions were the following:1. the use of ANSYS and PLAXIS finite element calculation to confirm each other,this approach to calculate the validity of the model in a large extent, clearly, experience, judgment, can accurately predict soil settlement law and used to betterand construction.2. proved that the rescue and repair the damage of the shield tunnel, in a range of soil reinforcement, with the hole tunneling operations.The accident occurred three months later, decided to adopt the tunneling method to repair the damaged shield tunnel repair process is smooth, finite element analysis results of the actual situation is more consistent with the scene. Prove that jet grouting to reinforce the tunneling method can be applied in the repair of damaged tunnel.