Rock structural surface occurrence measuring method integrated with laser-point cloud and digital imaging

Abstract

The invention provides a rock structural surface occurrence automatic digital measuring method integrated with laser-point cloud and digital imaging. By utilization of a photogrammetric technology, a mixed global and local threshold method is employed to extract contour lines off path lines, joint path lines are extracted through skeleton extraction and path line marking, and combined with other image processing methods, and information obtaining of rock joint path line occurrence is achieved. Finally, according to the distance of the path lines to the structural surfaces, the position relations of the path lines and the structural surfaces are determined, and the path lines and the structural surfaces are subjected to combining and grouping, and occurrence of each group is employed to represent rock structural surface occurrence. Laser-point cloud and digital imaging measuring methods are integrated, rapid, efficient, non-contact and landform disregard properties of the two measuring methods are utilized fully, the measuring accuracy is raised, and the provided method has advantages of high automation degree, strong universality, comprehensive description and the like.

Description

technical field [0001] The invention relates to a fully automatic digital measurement method for the occurrence of rock mass structure by combining laser point clouds and digital images, and belongs to the technical field of engineering geological survey. Background technique [0002] There are four main types of methods for measuring the occurrence of rock mass discontinuities: [0003] ①. Line survey method and window statistics method are to manually measure the occurrence information of structural planes one by one by measuring tape and compass on site. In the face of the characteristics of wide distribution, large number and strong randomness of rock mass structural planes in actual engineering, this method is inefficient, laborious and time-consuming, making it difficult to meet the engineering needs, and it is difficult to meet the requirements of the site conditions when encountering inaccessible steep cliffs and dangerous slopes. Therefore, the measurement method i...

AI Technical Summary

Problems solved by technology

This method cancels the relatively cumbersome photogrammetry algorithm in the photogrammetry method, and improves the measurement speed and accuracy, but still requires manual intervention to manually intercept the point cloud data describing the occurrence of the exposed rock mass structural plane in the massive point cloud data, and the method The method cannot measure the occurrence of unexposed rock mass structural planes or rock mass structural planes that appear in the form of traces.

[0007] To sum up, facing the characteristics of large number of rock mass structural surfaces, wide distribution and strong randomness in actual engineering, the current technical bottleneck lies in how to take into account non-contact (cancellation of site constraints), fully automatic (cancellation of manual intervention), measurement Fast speed (simple algorithm), universality (suitable for rock mass structural planes in various occurrence environments)

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