Non-destructive detection method of underground unfavorable geological body based on microtremor dispersion curves and H/V curves and application thereof

A dispersion curve, non-destructive detection technology, applied in the field of engineering geophysical detection, can solve the problems of pre-drilling, short drilling spacing, long construction period, etc., and achieve the effect of low shear wave velocity and high resolution

Inactive Publication Date: 2018-07-24
ARCHITECTURAL DESIGN INST FUKIEN PROV
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  • Application Information

AI Technical Summary

Problems solved by technology

Since the development and distribution of boulders have no obvious rules, the probability of revealing boulders through "one-hole view" of conventional drilling is very low. The current various ground geophysical methods are basically ineffective. The in-hole method has a certain effect, but pre-drilling is required. , to test various geophysica

Method used

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  • Non-destructive detection method of underground unfavorable geological body based on microtremor dispersion curves and H/V curves and application thereof
  • Non-destructive detection method of underground unfavorable geological body based on microtremor dispersion curves and H/V curves and application thereof
  • Non-destructive detection method of underground unfavorable geological body based on microtremor dispersion curves and H/V curves and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1: Micro-movement detection of unfavorable geological bodies in the subway shield section of a certain subway

[0077] Project overview: The site where the shield section of the subway is located is a road and its auxiliary roads, sidewalks, green belts, etc., and the terrain is relatively flat. From top to bottom, the rock and soil layers of the site are mainly miscellaneous fill, silty clay, coarse sand, residual soil, fully weathered, strongly weathered and medium to slightly weathered granite. According to the survey data, differential weathering of granite in this site is particularly obvious, and weathered cores (solitary rocks) are common in residual layers and fully-strongly weathered zones.

[0078] The observation system for micro-motion detection mainly adopts a regular pentagonal circular array (i.e. circular array), such as image 3 As shown, each circular array is composed of 6 detectors placed at the vertices and the center point of the regular p...

Embodiment 2

[0091] Example 2: Micro-movement detection of unfavorable geological bodies in a construction site foundation

[0092] Project overview: The surface of a construction site is dirt road, broken cement pavement, construction waste, etc., and the terrain is relatively flat. From top to bottom, the rock and soil layers of the site are mainly miscellaneous fill, silty clay, breccia-containing clay and moderately weathered limestone. According to the survey data, the karst caves in this site are relatively developed.

[0093] The observation system for micro-motion detection mainly adopts a regular pentagonal circular array (i.e. circular array), such as image 3 As shown, each circular array is composed of 6 detectors placed at the vertices and the center point of the regular pentagon. The distance from the vertices of the regular pentagon to the center point is called the observation radius R. According to the different conditions of the site, the observations were carried out w...

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Abstract

The invention relates to a non-destructive detection method of an underground unfavorable geological body based on microtremor dispersion curves and H/V curves and an application thereof. The detection method comprises the steps of (1) collecting surface micro-vibration signals of a plurality of measuring points, (2) calculating Rayleigh surface wave phase velocity dispersion curves in a micro-motion array, an H/V curve of each measuring point of a detector in the array and an array geometric mean H/V curve, (3) allowing each curve to form a contour map, and (4) inferring an anomalous geological body according to anomaly characteristics in the contour maps. The method is used for detecting longitudinal and lateral heterogeneous geological bodies within a depth range of 100 meters in a shallow ground surface in urban engineering construction. The probability of revealing lone stones and karst in the detection of the unfavorable geological bodies in subway shield construction is improved, and a safety area of shield tunneling construction is rationally divided. The detection method and the application have the advantages of convenient on-site collection, high detection precision, strong resolution, the shortening of a survey period, the reduction of engineering cost and the reduction of exploration risks.

Description

technical field [0001] The invention relates to an engineering geophysical detection method, in particular to a non-destructive detection method for underground unfavorable geological bodies based on fretting dispersion curves and H / V curves for the detection of vertically and horizontally uneven geological bodies within a depth range of 100m on the shallow ground surface in urban engineering construction and applications. 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. Winds, tides, air pressure changes, volcanic activities, etc. in nature will produce vibrations; while vibrations generated by human activities include vehicle movement, factory machinery operation, and even human walking. The frequency of the former is less than 1 Hz, and the frequency of the latter is greater than 1 Hz. [...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/30G01V1/303G01V1/306G01V2210/21G01V2210/6222
Inventor 刘宏岳林朝旭黄家坤殷勇林孝城张红梅林荣
Owner ARCHITECTURAL DESIGN INST FUKIEN PROV
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