THE INCREASING OF UNDRAINED SHEAR STRENGTH AND SHEAR MODULUS OF SOFT BANGKOK CLAY BY SILICA POWDER USING UNCONFINED COMPRESSION TEST WITH BENDER ELEMENT. INTERNATIONAL JOURNAL OF GEOMATE. 2020;18(69):118-123. Accessed June 22, 2026. https://geomatejournal.com/geomate/article/view/1518