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The rough surface can be observed; it is because the accumulative deformation and the specimen surface appear protruding prismoid, where the red arrow marks areas.
And based on geological conditions, the sand subsidence area did not present a cone type but an irregular cone type (prismoid), as shown in Figure 4.
The concrete samples used for compressive strength tests were prismoid with dimensions: 100 mm x 100 mm x 200 mm (got through severing the prismoid specimen from middle).