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
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[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 ...
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[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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