Dangerous condition early warning and forecasting method for pipe jacking downward penetrating process of existing box culvert

Abstract

The invention relates to a dangerous condition early warning and forecasting method for pipe jacking downward penetrating process of an existing box culvert. The method comprises the steps that 1, multiple characteristic parameter data of the existing box culvert and the surrounding soil bodies of the existing box culvert are collected through a monitoring device; 2, format processing is conductedon the collected data; 3, the soil strength in a disturbance zone is obtained through inversion by using a dichotomous displacement ratio method; 4, multiple characteristic parameters, the weight ofthe soil strength of the disturbance zone affecting culvert safety coefficients and gray relational grade are obtained through a hierarchical analysis gray relational grade method; 5, a long and shortterm memory circulation neural network model is established to predict the destruction occurring time of the existing box culvert; 6, a Kalman filtering method is adopted to predict the destruction occurring time of the existing box culvert; 7, prediction results of step 5 and step 6 are combined to conduct early warning and forecasting on dangerous conditions before the critical destruction occurring prediction time. Compared with the prior art, the method can more reasonably perform quantification early warning and forecasting on the dangerous condition for pipe jacking downward penetratingof the existing box culvert in a manner which is more closer to actual conditions.

Description

technical field [0001] The invention relates to the technical field of disaster early warning and forecasting for pipe jacking projects, in particular to a method for early warning and forecasting of dangerous situations in the process of pipe jacking and passing through existing box culverts. Background technique [0002] In recent years, with the vigorous development of urban rail transit and the improvement of tunnel excavation technology, the application of pipe jacking method in municipal engineering in soft soil areas such as Shanghai has become more and more extensive, covering double-layer tunnels, pedestrian tunnels crossing streets, and subway stations. In many projects such as the communication channel of import and export, the common ditch of urban underground pipelines, water diversion and drainage pipelines, etc. Although compared with the circular section, the effective use area of ​​the rectangular section is usually more than 20%. Pipe jacking construction ...

AI Technical Summary

Problems solved by technology

Among them, there are rare literature reports on the prediction of the time of catastrophic danger during the construction process of pipe jacking under existing buildings and structures, and the existing research results are difficult to accurately evaluate the construction process of pipe jacking under existing sewage tank culverts. However, it is impossible to fully consider the influencing factors (such as multi-layer stratum conditions, lining forms, construction conditions, etc.) that lead to the failure risk of box culvert underpassing and jacking, and the soil and structures during the construction of underpassing and jacking (roofing pipes, underground pipelines)

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