A Non-destructive Detection Method Based on Fretting Power Spectral Density and Its Application

A power spectral density, non-destructive detection technology, applied in the field of engineering geophysical detection, can solve the problems of electromagnetic wave-like method interference, failure to achieve expected results, and difficulty in popularization and use, and achieves convenient on-site collection, reduced engineering costs, and high detection accuracy. Effect

Active Publication Date: 2020-02-07
ARCHITECTURAL DESIGN INST FUKIEN PROV
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  • Abstract
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Problems solved by technology

[0008] Boulder detection in urban subway shield construction is a recognized technical problem. For example, in the special research on boulders in Guangzhou subway construction, as many as ten kinds of geophysical methods are used. Due to the complex urban comprehensive environment where the subway construction is located, electromagnetic wave methods are limited. The complex electromagnetic background in the city is seriously disturbed. Conventional seismic methods and direct current methods are greatly affected by the narrow ground space and complex surface conditions in the city. Various cross-hole CT methods have certain effects. The effect of the method is not the same, and is affected by the hole spacing, not only the cost is high, but the construction period is long
In general, many geophysical exploration methods have failed to achieve the expected results, and it is still difficult to promote their use

Method used

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  • A Non-destructive Detection Method Based on Fretting Power Spectral Density and Its Application
  • A Non-destructive Detection Method Based on Fretting Power Spectral Density and Its Application
  • A Non-destructive Detection Method Based on Fretting Power Spectral Density and Its Application

Examples

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Effect test

Embodiment 1

[0050] Example 1: Micro-motion detection of poorly constructed geological bodies of underground diaphragm walls of a subway station in a certain place

[0051] Project overview: The site where a subway station is located is all roads and auxiliary roads, sidewalks, green belts, etc. The terrain is relatively flat, and there are many high-rise buildings on the north side of the line, and the surrounding environmental conditions along the line are more complicated. The original landforms of this site belong to the coastal marine area. Affected by urban development and construction, all along the line have been excavated and filled and leveled manually. The current topography is flat and the ground elevation is generally 2-3m. The rock and soil layers of the site are mainly filled soil (rockfill), silt (textured soil), silty clay, medium sand, residual sandy clay and granite weathered rock (local diabase) from top to bottom. According to the survey data, the differential weather...

Embodiment 2

[0059] Example 2: Detection of air-raid shelters in a building site

[0060] Project overview: During the geotechnical investigation of a project, the dug holes BK8 and BK10 on the south side of the site have been constructed to expose the air-raid shelters, all of which are distributed in the moderately weathered granite. The exposed roof depth is 11.30~11.40m, and the exposed roof elevation is 3.46~ 3.94m, the height of the air-raid shelter is about 1.30-1.50m. The air-raid shelter is an abandoned air-raid shelter, and the location of the opening has not been found. The geotechnical structure of the site is relatively simple. From top to bottom, it is divided into: miscellaneous fill, rock fill, fully to strongly weathered granite and stroke granite, and the thickness of the covering layer is relatively thin. BK8 drilled below 3m is moderately weathered granite, and BK10 drilled below 1.3m is moderately weathered granite.

[0061] The observation system of micro-motion det...

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Abstract

The invention relates to a non-destructive detection method based on the micro power spectrum density and an application thereof. The detection method comprises the steps of 1, data acquisition; 2, preprocessing and processing analysis for original acquisition data; 3, result map drawing; 4, analysis and interpretation. The application of the micro power spectrum density based detection method isthat the detection method is used for detecting longitudinal and transverse inhomogeneous geologic bodies within a depth range of 100m at the shallow earth's surface in urban engineering construction.The advantages lie in that a non-destructive detection method is provided for longitudinal and transverse inhomogeneous geologic bodies of the shallow earth's surface in urban engineering construction, and the detection method has the advantages of convenient field collection, high detection precision, high resolving power and abilities of shortening the investigation period, reducing the engineering cost and reducing the exploration risk and the like.

Description

technical field [0001] The invention relates to an engineering geophysical detection method, in particular to a non-destructive detection method based on micro-movement power spectrum density for detection of vertically and horizontally uneven geological bodies within a depth range of 100m on shallow ground in urban engineering construction and its application. Background technique [0002] No matter when and where there is a natural weak vibration on the surface of the earth, it is called microtremor or ambient vibration, which originates from various activities of nature and human beings. Micromotion is a complex vibration composed of body waves (P waves and S waves) and surface waves (Rayleigh waves and Love waves), and the energy of the waves in the vertical direction accounts for more than 70% of the total energy of the signal. Although the amplitude and shape of the micro-motion signal change with time and space, it is statistically stable within a certain space-time r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/288
Inventor 刘宏岳张红梅林朝旭殷勇林孝城黄佳坤林荣
Owner ARCHITECTURAL DESIGN INST FUKIEN PROV
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