Mining-method tunnel excavation and first support quality detection method

Abstract

The invention provides a mining-method tunnel excavation and first support quality detection method. The method comprises the following steps: 1) determining an optimum precision point and laser scanner laser beam maximum incidence angle; 2) determining distance between measuring stations and the total number of measuring stations of a laser scanner; 3) obtaining tunnel first support surface pointcloud data, wherein the point cloud data refers to a three-dimensional coordinate of a first support surface point of the tunnel under a coordinate system of a tunnel monitoring reference point; 4) determining tunnel section mileage according to the tunnel section inspection requirements in the construction site; 5) projecting the extracted three-dimensional point coordinate onto a tunnel sectionto be detected; 6) determining data points for fitting and carrying out fitting to construct a curve, wherein the curve is the actual boundary obtained through tunnel section excavation; and 7) determining tunnel section overbreak and underbreak amount and position. The method realizes automatic, high-precision and continuous detection of mining-method tunnel first support quality.

Description

technical field [0001] The invention belongs to the field of tunnel detection, and in particular relates to a mining method tunnel excavation and primary support quality detection method. Background technique [0002] In recent years, with the rapid development of rail transit, the scale and quantity of engineering construction has shown a rising trend. According to statistics from the Ministry of Transport of the People's Republic of China, the operating mileage of railways in China reached 127,000 kilometers in 2017. Due to the influence of factors such as line planning, construction technology and construction cost in railway construction, a large number of tunnels need to be built to meet engineering needs. The mining method is one of the most commonly used methods for constructing tunnels. This method mainly uses blasting to loosen the surrounding rock of the excavation face, and then excavates the rock mass in sections in sequence, and supports the excavated part of t...

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Problems solved by technology

[0005] Aiming at the defects in the prior art, the object of the present invention is to provide a method for mining tunnel excavation and preliminary support quality inspection based on three-dimensional laser scanning technology, which overcomes the poor detection accuracy and low efficiency existing in the prior art , the shortcomings and deficiencies that cannot be continuously detected, and realize the automatic, high-precision and continuous detection of the initial support quality of mining tunnels

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