Method for dividing bed rock weathering zones by using longitudinal wave-surface wave speed ratio method

A ratio method and surface wave technology, used in seismic signal processing, seismic signal receivers, etc., can solve the problems of lack of fixed standards, difficult to meet the requirements of area survey, easy to cause deviation, etc., to achieve the effect of solving stratum division

Active Publication Date: 2011-06-08
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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Problems solved by technology

[0002] The classification of rock weathering zones at home and abroad mainly includes RQD classification, rock mass quality Q system classification, jointed rock mass RMR classification, and rock mass quality index RMQ classification. These classification methods are mainly based on drilling, human eye observation, and knocking sound. On the lack of a relatively fixed standard, it is easy to cause deviation
However, in-situ testing in holes requires drilling cooperation, which is difficult to meet the requirements of area surveys

Method used

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  • Method for dividing bed rock weathering zones by using longitudinal wave-surface wave speed ratio method
  • Method for dividing bed rock weathering zones by using longitudinal wave-surface wave speed ratio method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] according to figure 1 As shown, a method of dividing the bedrock weathering zone by the ratio of P-wave to surface wave velocity, the steps are as follows:

[0027] (1) Count a large number of known borehole wave velocity test data, statistically calculate the velocity ratio of longitudinal wave and shear wave in the hole, and use the relationship between the velocity of shear wave and surface wave to replace shear wave for inversion calculation;

[0028] (2) Arranging seismic arrays on the surface;

[0029] (3) Excited sequentially on the surface (O 1 ~O 18 shot point) such as figure 1 shows that the seismograph sequentially receives the refracted longitudinal waves V P and surface wave V R ;

[0030] (4) Use the refraction and surface wave inversion programs to preliminarily divide the formation and calculate its velocity V P , V R ;

[0031] (5) Calculate K=V P / V R The rock weathering zone is divided according to the K value; when the K value is in the ra...

Embodiment 2

[0033] according to figure 1 As shown, a method of dividing the bedrock weathering zone by the ratio of P-wave to surface wave velocity, the steps are as follows:

[0034] (1) Count a large number of known borehole wave velocity test data, statistically calculate the velocity ratio of longitudinal wave and shear wave in the hole, and use the relationship between the velocity of shear wave and surface wave to replace shear wave for inversion calculation;

[0035] (2) Arranging seismic arrays on the surface;

[0036] (3) Excited sequentially on the surface (O 1 ~O 18 shot point) such as figure 1 shows that the seismograph sequentially receives the refracted longitudinal waves V P and surface wave V R ;

[0037] (4) Use the refraction and surface wave inversion programs to preliminarily divide the formation and calculate its velocity V P , V R ;

[0038] (5) Calculate K=V P / V R The rock weathering zone is divided according to the K value; when the K value is in the ra...

Embodiment 3

[0040] according to figure 1 As shown, a method of dividing the bedrock weathering zone by the ratio of P-wave to surface wave velocity, the steps are as follows:

[0041] (1) Count a large number of known borehole wave velocity test data, statistically calculate the velocity ratio of longitudinal wave and shear wave in the hole, and use the relationship between the velocity of shear wave and surface wave to replace shear wave for inversion calculation;

[0042] (2) Arranging seismic arrays on the surface;

[0043] (3) Excited sequentially on the surface (O 1 ~O 18 shot point) such as figure 1 shows that the seismograph sequentially receives the refracted longitudinal waves V P and surface wave V R ;

[0044] (4) Use the refraction and surface wave inversion programs to preliminarily divide the formation and calculate its velocity V P , V R ;

[0045] (5) Calculate K=V P / V R The rock weathering zone can be divided according to the K value; when the K value is in th...

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Abstract

The invention relates to a method for dividing bed rock weathering zones by using a longitudinal wave-surface wave speed ratio method. The method comprises the following steps of: (1) arranging an earthquake arrangement graph on the ground surface; (2) carrying out refracted wave inversion on the earthquake arrangement to primarily divide stratums and determine the longitudinal wave speed VP of the stratums; (3) carrying out Rayleigh wave inversion on the earthquake arrangement to primarily divide stratums and determine the Rayleigh wave speed of the stratums to be VR; and (4) dividing weathering zones of rocks according to the formula of VP/VR=K. The method has the advantages that excitation is carried out once, longitudinal waves and surface waves are simultaneously received to achieve the purpose of complex geophysical prospecting, and the cost of seismic exploration can be reduced by more than 60 percent; earthquake arrangement can be flexibly arranged in places which are difficult to carry out geotechnical engineering investigation and drilling, which solves the problem of stratigraphic division; and the K value can be accurately determined through counting a large quantity of pore wave speed testing data and is used as a division standard of rock weathering degrees. The method is an area type prospection method, has the advantage of abundant information by viewing in the grander scheme and has more comprehensiveness compared with drilling.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for dividing bedrock weathering zones by the ratio of longitudinal wave to surface wave velocity. Background technique [0002] The classification of rock weathering zones at home and abroad mainly includes RQD classification, rock mass quality Q system classification, jointed rock mass RMR classification, and rock mass quality index RMQ classification. These classification methods are mainly based on drilling, human eye observation, and knocking sound. In fact, the lack of a relatively fixed standard is likely to cause deviation. However, in-situ testing in holes requires drilling cooperation, which is difficult to meet the requirements of area surveys. Contents of the invention [0003] The purpose of the invention is to develop a method for dividing the bedrock weathering zone by the ratio method of longitudinal wave-surface wave velo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/20
Inventor 杨麟峰熊建华李志强张红亮
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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