A method for measuring overbreak and underbreak in a single-hole double-track tunnel
A single-hole, double-line, measurement method technology, applied in the direction of measuring devices, surveying and navigation, instruments, etc., can solve the problems of laborious, time-consuming, expensive and unsuitable instruments, and achieve the effect of reducing personnel investment, reducing costs, and easy operation
Active Publication Date: 2018-09-07
CHINA RAILWAY NO 3 ENG GRP EAST CHINA CONSTR CO LTD +1
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Problems solved by technology
[0005] In order to solve the problems that the existing overbreak and undercut measurement methods are time-consuming, laborious, or expensive and unsuitable, the present invention provides a single-hole double-track tunnel overbreak and underbreak measurement method.
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Embodiment
[0056] Embodiment: 1. Overview of the work area
[0057] The NH-TA01 bid for the civil construction of a project of the applicant, the mining method construction section includes: the middle air shaft ~ the subway control center single-hole single-track tunnel, the subway control center ~ Nanjing South Station single-hole double-track tunnel. Among them, the design starting mileage of the single-hole double-line mining method section is DK0+426.702, the end mileage is DK0+611.338, and the total length is 184.636m; the thickness of the covering soil is about 6.14-23.82m. The interval demonstrated in the example is DK0+526.9864~DK0+555.946, and the section form is B-type section of V-level surrounding rock (see attached Figure 4 shown), in the gentle curve segment of the center line of the right line.
[0058] 2. Data collection
[0059] With the cooperation of two technicians, according to the actual situation on site, with the help of the total station, using the known cont...
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The invention belongs to the field of tunnel section control technology, more specifically relates to a method for determining overbreak-underbreak of a single-hole and double-track tunnel, and solves the problems existed in prior methods for determining overbreak-underbreak, such as time consumption, labor consumption, or inappropriate and expensive apparatuses. The method comprises the following steps: data acquisition, acquisition is carried out for each point on section of the single-hole and double-track tunnel; a curvilinear equation is fitted with MATLAB software, fitting is carried out for centerlines of tracks and a central axis of the big hole, and a fitted equation is obtained; programming is carried out with VB, and a program is programmed by the fitted equation obtained in the S2; data acquired in the step S1 is processed with Excel, the VB program obtained in the S3 is inputted into a macro, and the acquired data is processed; and graphic correlation and result calculation are carried out with Autocad software, overbreak-underbreak values are obtained, in order to guide site construction. The method has the advantages of improved calculating efficiency, reduced cost, reduced personnel investment, guaranteed site safety, and high efficiency construction.
Description
technical field [0001] The invention belongs to the technical field of tunnel section control, and in particular relates to a method for measuring overbreak and undercut of a single-hole double-track tunnel. Background technique [0002] During tunnel construction, over- and under-excavation phenomena are often encountered. Comparing the contour line obtained by actual excavation with the design excavation contour line, the part outside the design excavation contour line is over-excavation, while the part inside the design excavation contour line is under-excavation. Over- and under-excavation will cause many hazards to construction, such as: the increase of excavation and support costs, the inability of waterproof materials to match the rock surface, and the local stress concentration of surrounding rocks. [0003] In order to better control overbreak and underbreak, it is necessary to formulate a suitable overbreak and underbreak measurement method to guide on-site constr...
Claims
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IPC IPC(8): G01C7/06
CPCG01C7/06
Inventor 李达昌成云段沛材
Owner CHINA RAILWAY NO 3 ENG GRP EAST CHINA CONSTR CO LTD