Evaluation method for medium compactness based on reflection wave energy characteristic
A technology of energy characteristics and evaluation methods, applied in the field of shallow geological exploration and detection, can solve problems such as low strength, quicksand, liquefaction, poor water stability, etc., achieve high detection accuracy and simplify operating procedures
Active Publication Date: 2019-03-29
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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The compactness has an important influence on its engineering properties. The dense sandy soil has high strength and low compressibility, which is a good building foundation; but loose sandy soil, especially saturated loose sandy soil, not only the strength low, and the water stability is very poor, prone to engineering accidents such as quicksand and liquefaction, the main problem in the evaluation of sandy soil is to correctly classify its density
[0004] In the seismic reflection wave method exploration, the acquisition data is obtained by multi-channel or single-channel acquisition method, and then the reflection wave stacking section in the depth domain is obtained through the process of "denoising-motion correction-stacking-migration-time-depth conversion". Based on the interpretation, to determine the stratigraphic boundary, in this process, based on the characteristics of shear wave and longitudinal wave, one step divides the lithology, etc., and the data processing process is cumbersome
The shock-echo method uses instantaneous mechanical shock to generate a low-frequency stress wave on the detection surface. The stress wave propagates into the medium and then returns, and generates longitudinal wave resonance inside the medium. The thickness of the detection medium component is determined by detecting the vibration frequency caused by the shock elastic wave. And the method of its internal defect position, this method can only obtain the plane distribution of the detection medium thickness and defects, and cannot obtain the relevant attributes at each depth
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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0030] Such as figure 1 A method for evaluating the compactness of a medium based on the energy characteristics of reflected waves is shown, including the following steps:
[0031] 1) Survey line layout: According to the theory of multiple coverage of seismic reflection waves, the separation seam of the high-speed rail track slab structure is detected, and the ultrasonic reflection method is used for detection. Multiple survey lines P(x) are arranged in parallel along the track direction, where x is the survey line The abscissa value of the line, such as figure 2 As shown, the measurement points are evenly arranged on each measurement line, and the distance between the measurement points is set to 0.2m. The data collection of each measurement point uses a point excitation and 11 channels of reception. Ultrasonic transducers are used...
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The invention discloses an evaluation method for medium compactness based on reflection wave energy characteristics. The evaluation method comprises the following steps: a line arrangement, linearly arranging a plurality of measuring points along the surface of a detected or explored dielectric according to a seismic reflection wave multiple coverage theory; a data acquisition, exciting signals point-by-point, collecting at each measuring point to obtain a common shot gather, and forming multi-channel waveform data; a data preprocessing, carrying out band-pass filtering processing; extractinga velocity profile; carrying out reflection wave correction superposition to form a post-stack time profile; obtaining an initial amplitude of the surface energy by means of amplitude superposition; performing compaction index calculation; and a dense index depth profile calculation, converting an exponential time profile from a time domain to a depth domain, and finally obtaining a compact indexdepth profile for evaluation. According to the evaluation method for medium compactness based on reflection wave energy characteristics, specific process data processing is carried out on data acquired by the earthquake reflection wave method, so that the compactness three-dimensional space distribution condition of the shallow geological medium is obtained, and meanwhile the high detection precision is also ensured.
Description
technical field [0001] The invention relates to the technical field of shallow geological exploration and detection, in particular to a medium compactness evaluation method based on reflected wave energy characteristics. Background technique [0002] The Seismic Reflection Method is a method of artificial seismic exploration using seismic reflection waves. It is the primary means of resource exploration. The exploration results can accurately determine the depth and shape of the interface, delineate the local structure, and judge the lithology of the stratum. There are mainly two kinds of single-channel continuous profile method and multi-channel continuous profile method. In order to improve the signal-to-noise ratio, common deep point reflection technology is also widely used in multi-channel continuous profile method. After obtaining the collected data, the formation reflection wave profile is obtained through a special processing process, and the relevant data are interp...
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IPC IPC(8): G01V1/30
CPCG01V1/302G01V1/306G01V2210/6224G01V2210/624
Inventor 刘铁华刘铁化希瑞卞友艳张邦林昀崔德海肖立锋蔡盛赵威王敏雷理卿志杨正国刘伟陈洪杰
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP