Table 3 Experimental matrix table.

From: Discussion on the change rule of different characteristic parameters with depth in expansion soil graben slopes

Experimental items

Testing methods

Parameters

Depth ranges (m)

Dry weight test

By the standard for geotechnical test methods (GBT 50123-2019)

Dry weight (g/cm3)

0–0.5, 0.5–1.0, 1.0–2.0, > 2.0

Unconfined compressive strength test

Use of YYW-2 type unconfined pressure gauge

Unconfined compressive strength (kPa)

Three-way expansion force test

Using a three-way expansion meter

Vertical expansion force and horizontal expansion force (kPa)

Loadless expansion rate test

Using WZ-1 type expansion meter

Expansion volume (%)

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