Rayleigh wave subgrade detection cavity three-dimensional positioning method
A three-dimensional positioning method and Rayleigh wave technology, applied in the field of cavity detection, can solve problems such as the inability to estimate the size and spatial position of the cavity
Inactive Publication Date: 2017-02-01
CHONGQING UNIV
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Although the position of the underground cavity can be seen from this profile, the wave velocity profile is two-dimensional, which can only reflect the condition of the cavity in a certain vertical section, and cannot estimate the size and spatial position of the entire cavity.
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[0023] In order to solve the shortcomings of the two-dimensional wave velocity profile used in cavity analysis, the present invention proposes a method of adding Rayleigh wave observation lines to obtain a three-dimensional three-dimensional map. The advantage of the three-dimensional map over the two-dimensional map is that not only the cavity can be estimated The position and the size of the cavity can be predicted and estimated, so that the overall condition of the cavity can be obtained. During actual processing, the present invention arranges a plurality of Rayleigh wave observation lines on site, respectively obtains a two-dimensional wave velocity profile from the data collected by detectors on each Rayleigh wave observation line, and then obtains a two-dimensional wave velocity profile by multiple two-dimensional wave velocity The three-dimensional map is obtained by combining the profile maps, so as to realize the prediction and estimation of the spatial position and s...
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The invention discloses a Rayleigh wave railway substructure monitoring cavity three-dimensional positioning method. The method includes the steps: 1) arranging N Rayleigh wave observation measuring lines on a railway substructure monitoring site to obtain N wave velocity profile maps; 2) preliminarily determining boundaries A and B of a cavity through the N wave velocity profile maps; 3) fitting a least square method with a straight line algorithm to obtain a straight line y with upper vertexes S sequentially connected and corresponding; 4) arranging one Rayleigh wave observation measuring line on the straight line y and accurately determining the cavity boundaries A and B; 5) arranging M Rayleigh wave observation measuring lines perpendicular to the straight line y to obtain corresponding M wave velocity profile maps; 6) sequentially connecting upper, lower, left and right vertexes of the M wave velocity profile maps to finally obtain a three-dimensional diagram reflecting the spatial position and the size of the cavity. According to the method, a railway substructure cavity three-dimensional structure can be obtained, the position of the cavity can be estimated, and the size of the cavity can be forecasted, so that the overall situation of the cavity can be acquired.
Description
technical field [0001] The invention relates to the detection of subgrade cavities, in particular to a Rayleigh wave subgrade detection cavity three-dimensional positioning method, which belongs to the technical field of cavity detection. Background technique [0002] With the development of my country's national economy and the enhancement of comprehensive national strength, my country's railway, highway, building and other construction projects are also developing rapidly. Erosion holes, culverts, etc. The existence of underground cavities will cause the foundation of the building to hang in the air, and the bearing capacity of the roadbed will be insufficient to cause subsidence, causing serious geological disasters. Therefore, the detection and exploration of the underground cavity of the project site is of great significance to the quality and safety of the project. [0003] The survey of engineering sites with underground cavities is usually a large-scale, large-area ...
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IPC IPC(8): G01V1/00G01V1/28
Inventor 甘平柴贺军靳晓光李东链陈卓张宇曾彩兰申晓青余欢乔俊黄河黄扬帆
Owner CHONGQING UNIV