IEEE Instrumentation & Measurement - September 2023 - 51

ultrasonic transmission imaging of the soil-rock mixture at
any position by using the ultrasound imager, and to obtain the
profile image of the internal structure of the soil-rock mixture.
With a special sliding fixing device, the ultrasonic probe can be
fixed on any position of the soil-rock mixture adaptively and
retractable, which can realize 360 degrees of free rotation and
retractable, and can realize fixed observation of any size of the
probe. The device greatly facilitates the multi-directional and
multi-angle ultrasonic imaging detection of the internal structures
of soil-rock mixture and related engineering application
analysis.
Ultrasonic Transmission Imaging Analysis
Method of Soil-rock Mixture
The basic principle of this paper is that the ultrasonic wave
can produce a large echo in the interface area of the soilrock
mixture. First, the array ultrasonic waves emitted by
the ultrasonic scanner will appear relatively strong reflection
attenuation in the soil-rock interface area, and the light
spot stripes will appear. Based on this, the internal structure
characteristics of soil-rock mixture are determined, and
then the boundary range of soil-rock mixture can be identified.
Finally, the morphological characteristic parameters of
the internal structure of the soil-rock mixture are obtained
by qualitative and quantitative statistical analysis. At present,
it is mainly used to solve the problems of porosity and
boundary landslide of soil-rock mixture in geotechnical engineering.
The main methodological steps of the analytical
process are shown in Fig. 3.
It is worth noting that the ultrasound imager mentioned in
this paper has been modified with its internal ultrasonic imaging
mechanism, making it more applicable to the imaging
detection research of profile structures of soil-rock mixture in
under water environments. It has been successfully used in
indoor engineering model testing and part field practical engineering
applications, which have been widely praised at home
and abroad, creating a precedent for the application of ultrasonic
imaging physical model test.
Ultrasonic Transmission Imaging
Test of Soil-Rock Mixture
Step (1) Set up ultrasonic
imaging testing device
Step (2) Obtain
multiple profile images
Step (3) Statistical analysis
of the imaging characteristics
Step (4) Approximate
calculation of pore space ratio
Step (5) Reconstruction of internal
structural morphological characteristics
Fig. 3. The detection method for the morphological characteristics of the
internal structure of soil-rock mixture.
The following part is an example of ultrasonic transmission
imaging test of the soil-rock mixture in the leakproof pool
under the testing environment conditions (average particle
size 0.3 mm, ultrasonic frequency 5 MHz). The experimental
scheme is shown in Fig. 4.
Imaging control
and processing
Images
Signals
Ultrasonic wave
Transmitting
Receiving
Ultrasonic Imaging Testing Device Set Up
Experimental devices such as the ultrasound imager and ultrasonic
probe are connected, and the ultrasonic probe is fixed
in the soil-rock mixture with sliding fixing device, and enough
coupling agent is injected. During the experiment, to ensure
that the ultrasonic probe is in close contact with the surface
structure of the soil-rock mixture, it is tightly pressed into the
surface. According to the on-site environment of the test object
and the test requirements of the actual engineering, the coupling
agent cannot be used under water, and the ultrasonic
probe can be directly pressed into the specified area through
the sliding fixing device to carry out the ultrasonic scanning
imaging experiment. To obtain better testing results, it is necessary
to coat many coupling agents in the contact area of
the ultrasonic probe, and then conduct ultrasonic transmission
imaging test when in anhydrous environment. Among
them, the imaging monitoring
schematic diagram of
ultrasonic probe and the obtained
profile image of the
internal structure of soilrock
mixture obtained are
shown in Fig. 5.
Particles
Obtain Multiple
Profile Images
When the ultrasonic wave
Fig. 4. Experimental test scheme of soil-rock mixture.
September 2023
IEEE Instrumentation & Measurement Magazine
propagates in the soilrock
mixture, the energy
51

IEEE Instrumentation & Measurement - September 2023

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