A method of dividing the compactness of gravel soil foundation by inversion of shear wave velocity by surface wave

A shear wave and compaction technology, applied in the engineering field, can solve the problems of difficult drilling, low detection efficiency, limited detection depth, etc., and achieve the effect of overcoming the difficulty of drilling

Active Publication Date: 2016-07-27
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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Problems solved by technology

The direct method is mainly the pit measurement method, that is, digging pits, weighing, and measuring volume. It is an original and commonly used method, and the measurement results are relatively accurate and reliable. Due to these limitations, the large-scale use of the pit measurement method in the quality inspection of large-sized gravel fillings is limited; the indirect methods mainly include dynamic penetrating sounding method, compaction settlement observation method, continuous compaction control method, Loading plate method, surface wave method
[0003] The dynamic penetrating sounding method, the compaction settlement observation method, the continuous compaction control method, and the bearing plate method all have problems such as difficult drilling, long time, high cost, and limited detection depth.

Method used

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  • A method of dividing the compactness of gravel soil foundation by inversion of shear wave velocity by surface wave
  • A method of dividing the compactness of gravel soil foundation by inversion of shear wave velocity by surface wave
  • A method of dividing the compactness of gravel soil foundation by inversion of shear wave velocity by surface wave

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specific Embodiment approach

[0064] figure 2 It is a schematic diagram of the on-site detection layout of ground transient Rayleigh wave measurement. In the figure, 1 is a seismograph, 2 is an analyzer, 3 is a geophone, 4 is a weight, and 5 is a backing plate. Acquisition of Rayleigh wave shear wave velocity according to the operating procedures, this process should be completed through field operations. We adopt the single-ended excitation method, arrange 24 geophones, the geophone frequency is 4Hz, the distance between the channels is 1m, the offset distance is 5m, the number of sampling points is 2048, and the sampling interval is 250us. With the measuring point as the center of symmetry, the geophone is evenly placed on the ground in a straight line, so that it fits closely with the ground and stands upright. The ground is hit vertically with a heavy hammer, and the seismograph records the ground vibration signal received by the geophone. Repeat the above steps 3 to 5 times to superimpose multiple ...

Embodiment

[0067] The test was carried out in three different sites, so the test sites were all less earthwork and more stonework, and stonework backfill was the main one. The general situation of dynamic compaction construction is shown in Table A and Table B, and there are three types of fillers

[0068] Table A list of dynamic compaction parameters in soil-rock mixed fill area

[0069]

[0070] Note: The particle size of gravel in gravel soil is less than 500mm.

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Abstract

The invention discloses a method for dividing the density degrees of gravelly soil foundations through the surface-wave inversion shear wave velocities. Compared with the prior art, the method has the obvious advantages that as Rayleigh waves have the different propagation velocities in the gravelly soil dynamic-compaction foundations with the different density degrees, the propagation velocity of the Rayleigh waves in a surface slack layer serves as the standard, and the relationships between the Rayleigh waves and the density degrees in the gravelly soil dynamic-compaction foundations with the different density degrees are built. The density degrees of the gravelly soil dynamic-compaction foundations are simply, rapidly and automatically determined, and the problems that during current detection, the exploration difficulty is large, time is long, cost is high, and the detection depth is limited are solved.

Description

technical field [0001] The invention relates to the technical field of engineering, in particular to a method for dividing the foundation compactness of dynamic rammed large-diameter gravel soil by using surface wave inversion of shear wave velocity Vs and its wave velocity ratio ΔVs. Background technique [0002] At present, large-size gravel soil is used as dynamic compaction backfill. Because of its strong adaptability to different ground conditions, small settlement, good stability, good seismic performance, simple construction, and easy repair, it can be used in mountainous areas. Local materials are obtained, and there are relatively abundant sources of materials, which have significant advantages in terms of technical and economic indicators, especially in the construction of land in mountainous areas, a large number of on-site backfilling is used. However, due to the large particle size and uneven particle distribution of gravel soil, it brings great difficulties to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/00
CPCE02D1/00
Inventor 王小章高杰杨麟峰熊建华郑俊李志强周培峰赵谦黎明
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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