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

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. [...

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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 geophysical penetration methods in the hole, such as elastic wave CT tomography, electromagnetic wave tomography, resistivity CT tomography, etc. Such methods require a short drilling distance, so the cost is high and the construction period is high. Drilling in complex underground cables, optical cables, and pipelines in urban roads has considerable risks

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