Optimization method of shield excavation parameters under condition of compound stratum

Abstract

The invention discloses an optimization method of shield excavation parameters under the condition of a compound stratum. The method is characterized by comprising the following steps of (1) carrying out shield excavation orthogonal experimental design; (2) collecting excavation data; utilizing a data collection and storage system of a shield tunneling machine to collect and record experimental data; collecting the thrust, the rotating speed of a cutter, the excavation speed, the foam solution adding amount, the foam concentration and the cutter torque by the data collection system during the experiment process; collecting data at a time after excavating 20mm every time, wherein the experimental excavation length of each group is 1.6m; (3) building a shield excavation parameter mathematical model; designing an orthogonal experimental model according to the shield construction process, carrying out nonlinear regression analysis on data collected by the orthogonal experiment, respectively building an excavation speed model and a cutter torque model of earth pressure balance shield, confirming the reasonable excavation parameters under the condition of the compound stratum through resolving, and optimizing the excavation parameters, so that the safety of shield construction is improved, and the service life of the shield tunneling machine is prolonged.

Description

technical field [0001] The invention relates to the technical field of shield tunneling parameter selection, in particular to a method for optimizing shield tunneling parameters in complex strata. Background technique [0002] The parameter control of shield tunneling in complex strata has always been a concern of tunnel construction technicians. During the excavation process of the composite stratum with soft top and hard bottom, the biggest hazard is that due to improper selection of excavation parameters, the soft soil above is likely to cause over-excavation, and the pressure inside and outside the shield excavation surface is unbalanced, resulting in serious ground subsidence and even accidents. Therefore, it is of great significance to establish and optimize the model of shield tunneling parameters in composite strata to determine the optimal tunneling parameters to ensure the tunneling speed and safety of shield tunneling under composite stratum. [0003] Scholars at...

AI Technical Summary

Problems solved by technology

During the excavation process of the compound stratum with soft top and hard bottom, the biggest hazard is that due to improper selection of excavation parameters, the soft soil above is likely to cause over-excavation, and the pressure inside and outside the excavation surface of the shield machine is unbalanced, resulting in serious ground subsidence and even accidents.

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