Sectional surrounding rock convergence deformation close-range photogrammetry method

Abstract

The invention belongs to the technical field of section convergence deformation close-range photogrammetry of underground engineering caverns and tunnels and particularly relates to a sectional surrounding rock convergence deformation close-range photogrammetry method. The method comprises steps: 1, a measuring point A and a measuring point B are arranged at a left side and a right side of a surrounding rock section, and a measuring line A-B is obtained; 2, a fixing point A' and a fixing point B' are arranged near the measuring point A and the measuring point B, and the measuring point A, the measuring point B, the fixing point A' and the fixing point B' are ensured to be in a straight line; 3, by adopting the close-range photogrammetry technology, convergence deformation data of a measuring line A-A' and convergence deformation data of a measuring line B-B' are acquired respectively; and 4, summation is carried out on the convergence deformation data acquired in the third step to obtain surrounding rock convergence deformation data. The method of the invention can be particularly applied to the field of convergence deformation or displacement measurement of the surrounding rock section of the underground engineering cavern and the tunnel by adopting the close-range photogrammetry mode based on a non-measurement digital camera situation.

Description

technical field [0001] The invention belongs to the technical field of close-range photogrammetry of the convergence deformation of underground engineering caverns and tunnel surrounding rock sections, and particularly relates to a segmented surrounding rock convergence and deformation close-range photogrammetry method. Background technique [0002] The close-range photogrammetry technology has been successfully applied in the field of monitoring the convergence and deformation of surrounding rock sections in underground engineering caverns and tunnels. In particular, the digital close-range photogrammetry technology based on non-measurement digital cameras has the advantages of low cost and high accuracy. It has developed rapidly in recent years. However, there are some typical shortcomings of this technology at present. First, under the premise of fixing the camera, the measurement accuracy of the system will decrease rapidly with the increase of the span of the surroundin...

AI Technical Summary

Problems solved by technology

However, the current technology has some typical shortcomings. First, under the premise of fixing the camera, the measurement accuracy of the system will decrease rapidly with the increase of the span of the surrounding rock section; secondly, with the increase of the span of the cofferdam section, the three-dimensional control field The distribution volume is also increasing, which will have a serious impact on the work efficiency of engineering construction and the transportation and assembly of the measurement system.

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