Method and system used for evaluating overbreak and underbreak of tunnel

Abstract

The present invention provides a method for evaluating overbreak and underbreak of a tunnel. The method comprises the following steps that the tunnel is scanned, point cloud data of the tunnel is obtained, and the point cloud data is preprocessed so as to obtain preprocessed data; basic data in the preprocessed data is extracted and compared with calibrated data in a construction design document,and the first evaluation result is obtained; overbreak data of the tunnel are calculated and obtained according to the preprocessed data and compared with the control standard, and the second evaluation result is obtained; according to the preprocessed data, the underbreak data of the tunnel is calculated and obtained and compared with the control standard, and the third evaluation result is obtained; the first evaluation result, the second evaluation result and the third evaluation result are comprehensively processed so as to obtain the final evaluation result. The method and system used forevaluating overbreak and underbreak of the tunnel can be used for evaluating overbreak and underbreak of the tunnel, the calculated overbreak data and the calculated underbreak data are compared withthe control standard, and tunnel engineering is evaluated.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a method and system for evaluating tunnel overbreak and underbreak conditions. Background technique [0002] During tunnel excavation, the phenomenon of over- and under-excavation is common. Over- and under-excavation not only increases the construction cost, but also causes local stress concentration in the surrounding rock and affects the overall stability of the tunnel structure. At present, the tunnel survey uses a total station for measurement, but the accuracy of the total station can only reach 3 to 4 mm within the range of 20 to 30 meters, and the measurement accuracy is not high. In addition, the total station is greatly affected by smoke and light, and has high requirements for the measurement environment. Moreover, the total station has too many links in information feedback, and the data information cannot be fed back to the construction site in time, and the infor...

AI Technical Summary

Problems solved by technology

Over- and under-excavation not only increases the construction cost, but also causes local stress concentration in the surrounding rock and affects the overall stability of the tunnel structure

At present, the tunnel survey is carried out with a total station, but the accuracy of the total station can only reach 3 to 4 mm in the range of 20 to 30 meters, and the measurement accuracy is not high.

In addition, the total station is greatly affected by smoke and light, and has high requirements for the measurement environment

Moreover, the total station has too many links in information feedback, and the data information cannot be fed back to the construction site in a timely manner, and the information feedback is too slow

Only using total stations to measure is not efficient. In order to complete the tunnel project smoothly, an efficient and reliable evaluation method is very necessary in the evaluation of tunnel overbreak and underbreak

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