Earth pressure balance shield deslagging quantity estimation and correction method

Abstract

The invention discloses an earth pressure balance shield deslagging quantity estimation and correction method. The method comprises the following steps: S1, cleaning earth pressure balance shield tunneling parameter data; s2, selecting shield tunneling parameters and slag discharge quantity values of the cleaned normal construction section, and calculating shield theoretical slag discharge quality; s3, the actual shield deslagging mass is calculated; s4, the shield extra deslagging mass is calculated; s5, calculating a shield deslagging quality estimated value; and S6, optimizing, correcting and adjusting the estimated value of the shield deslagging amount. By adopting the earth pressure balance shield deslagging quantity estimation and correction method, the predicted shield deslagging quality calculated value is closer to the actual deslagging quality by integrating the adjustment of the external additive and the soil bin pressure maintaining mode and the change of the shield deslagging quality caused by factors such as underground water, and then through cyclic correction, the shield deslagging quality can be accurately estimated. And the prediction precision and reliability of the slag discharge amount of each ring of shield are further improved.

Description

technical field [0001] The invention relates to a technology for estimating the slag output, in particular to a method for estimating and correcting the slag output of an earth pressure balance shield. Background technique [0002] As the urbanization rate increases year by year, the huge urban population has an increasing demand for urban public infrastructure, and problems such as traffic congestion and shortage of usable land are becoming more and more serious. Therefore, vigorously developing trenchless underground pipeline projects and underground rail transit projects has become one of the main propositions of urban infrastructure construction. As the mainstream method of trenchless pipeline and tunnel engineering, the shield method has been used in the construction of urban rail transit and hydropower tunnels in various places. Taking the urban agglomeration in South China as an example, the third phase of Guangzhou Urban Rail Transit (2017-2023) will add 258.1 kilom...

AI Technical Summary

Problems solved by technology

Among them, the excessive surface displacement caused by the shield has always been one of the main safety risks in the construction of earth pressure balance shields.

However, due to the large value range of the looseness coefficient and the discrepancy between the geological survey data and the actual situation of the soil layer, the theoretical volume of the soil after shield excavation deviates greatly from the actual volume, and the estimated theoretical mass of the soil Often less than the actual slag quality

The low accuracy of the prediction value of slag output makes it difficult for the existing shield tunneling slag output estimation method to be truly popularized and applied in engineering

On the other hand, the ground surface settlement caused by shield tunneling is determined by the amount of slag produced by the shield tunnel and the grouting amount of the shield tunnel, and there is a time lag in the ground settlement, so strengthening the monitoring of surface settlement cannot provide timely information on the amount of slag produced by the shield tunnel. The adjustment provides guidance and can only be used as an evaluation index for the construction effect after shield tunneling construction

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