Research On Rings' Fixing DTA In TBM Construction

The task is from the National 863 project -- the Research and Demonstration Application of the Tunnel Boring Machine (TBM) Assistant System and Guidance Technology. The main research in this dissertation is on how to select proper rings to fix the Designed Tunnel Axis(DTA). It is usually to predict the rings according to the result calculated with formulas. Formulas only cannot deal with the matter because the articulate jacks' push-lengths are not sure on TBM with articulate jacks, and new methods have to be found. Fuzzy control method can solve this problem well. The details of the research are as following:(1)Taking the general way that is to set up certain models and get formulas to select rings to the TBM without articulate jacks.(2)Introducing artificial intelligence theory in rings' prediction on the TBM with articulate jacks. The articulate jacks' push-lengths cannot be used directly because it cannot be controlled beforehand. The fuzzy control method can deal with this matter. The layered fuzzy control method is designed to select rings. The designed fuzzy method can also be used on the TBM without articulate jacks if it is considered as the push-lengths are all zero (3)Designing the methods to judge whether there is deviation. The rings' prediction and the state of the TBM are combined to decide the steering direction. The designed tunnel axis is given with some references and the points' coordinates need to be calculated. To calculate the coordinates the instert-line way is used and each inserted line's length is one meter. The error analyse proves the method works. Then the designed and the calculated coordinates are compared to judge whether there is correct the deviation.(4)Designing the correction curves. Correction curves are to be designed and inserted from the latest ring if the deviation is beyond the ring's correction ability, back to the DTA by tangent.