Tunnel monitoring measurement data analysis method based on maximum entropy method reliability theory

Abstract

The invention relates to a tunnel monitoring measurement data analysis method based on a maximum entropy method reliability theory. The method mainly comprises the following steps of acquiring point cloud data of a primary support of a tunnel in a tunnel construction process; computing a distance between corresponding points between point cloud faces adjacent in time in order to determine a displacement of the support at the same position of the tunnel in a specific duration, and obtaining a displacement matrix generated by the deformation of the primary support of the tunnel; and computing based on the displacement matrix by utilizing a maximum entropy method in order to obtain a probability density function of the deformation of the primary support of the tunnel, determining a tunnel monitoring measurement index, drawing a convergence time curve according to the measurement index in order to determine whether the deformation of the tunnel is converged, and judging whether the deformation of the primary support of the tunnel meets the requirements for construction at each stage. According to the method, the analysis of the deformation of the primary support of the tunnel construction can be realized, an analysis result error is small, and the actual deformation degree of the support can be accurately reflected.

Description

technical field [0001] The invention belongs to the field of tunnel construction monitoring measurement, which introduces the reliability theory of maximum entropy method, analyzes the results of three-dimensional laser scanning, judges the tunnel deformation, and obtains a method for tunnel monitoring measurement results. Background technique [0002] 1. Three-dimensional laser scanning technology [0003] The 3D laser scanner uses the principle of laser ranging to form a point cloud by recording the 3D coordinates of a large number of dense points on the tunnel surface, and records the condition of the tunnel surface in the form of a point cloud. 3D laser scanning can be used for reverse engineering of tunnels. [0004] 2. Tunnel monitoring measurement [0005] Tunnel monitoring and measurement is to understand the rock mechanical properties of the surrounding rock and the stress state of the supporting structure of the tunnel under construction or in operation, and to e...

AI Technical Summary

Problems solved by technology

The amount of 3D laser scanning detection data is large, but after denoising the local position, there are still some large errors caused by the poor tunnel detection environment

At present, in the tunnel monitoring and measurement, only individual detection points such as the vault and the arch waist are extracted for analysis, and the adaptability to shield tunnel construction is good, but in the new Austrian tunnel construction, the massive data is not effectively utilized. Foreign matter inside the initial support of the tunnel, high particulate matter content such as PM10 in the tunnel, local water leakage in the tunnel, local potholes in the tunnel, etc., lead to insufficient detection accuracy, which can easily lead to misjudgment of the surrounding rock conditions of the tunnel, which has a great impact on safe production Therefore, it is still difficult to use a large number of 3D laser scanning technology to carry out tunnel monitoring and measurement in the construction of new Austrian method tunnels.

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