An Alignment Early Warning Method for Shield Tunnel

Abstract

The invention discloses a shield tunnel alignment early warning method, comprising the steps of: 1. calculating the actual accumulated rotation angle of the current segment ring I; 2. calculating the actual base distance of the current segment ring I; 3. calculating the base support Four, calculate the standard deviation of the residual error of the distance deviation of each ring of the segment ring; five, calculate the residual coefficient of each ring of the segment ring; six, calculate the shock value of the residual coefficient; seven, Shield tunnel linear warning. The present invention calculates the included angle between the axes of two adjacent two-ring segments and accumulates them to obtain the actual accumulated rotation angle of the current segment ring, and then calculates the actual distance of each ring segment to obtain the rotation angle. Calculate the residual standard deviation and residual coefficient of the offset deviation, obtain the shock value of the residual coefficient and give the early warning signal of the shield tunnel alignment. High, to reduce accidents caused by severe deviation of the shield segment assembly route.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel alignment early warning, and in particular relates to a shield tunnel alignment early warning method. Background technique [0002] During the advancement of shield construction, due to the influence of soil pressure on the excavation surface, surrounding rock pressure, stratum, and the level of shield machine operators, the actual assembly line shape of the shield segment will deviate from the original design line shape. This problem is also called the serpentine problem of shield tunneling. When the deviation is small, taking certain corrective measures in time can make the shield excavation meet the original design alignment requirements. However, when the deviation is large, there is no possibility of successful deflection correction of shield tunneling. This will cause the shield machine to fail to reach the receiving well according to the route, which will increase the workload, dela...

AI Technical Summary

Problems solved by technology

When it is found that the deviation exceeds a certain range, report to the superior competent department for processing. This method is subjective and delayed, and cannot properly handle the axis deviation state in a timely and efficient manner. At the same time, the measurement of data depends on the accuracy of the total station. If the control point accuracy of the total station is not enough or if there is an error in one measurement, errors will be introduced to all subsequent data, resulting in errors in the input data of the laser guidance system of the shield machine, and the guidance error of the laser guidance system of the shield machine without knowing it

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