@article{S. Chatchawan_R. Nuntasarn_2019, title={DRAINED SHEAR STRENGTH OF COMPACTED KHON KAEN LOESS FROM MULTISTAGE TRIAXIAL TEST}, volume={17}, url={https://geomatejournal.com/geomate/article/view/2163}, abstractNote={<p>The previous research found that Khon Kaen loess is collapsible soil. The structure of Khon<br>Kaen loess is a honeycomb structure and loose adhesion. The cause of losing shear strength and collapsing is<br>the increase in moisture content. The purpose of this study was to investigate the influence of matric suction<br>on the shear strength of compacted Khon Kaen loess by a multistage consolidated drained triaxial test.<br>According to the soil water characteristic curve, the matric suction of this study consists of saturation regime<br>at matric suction of 0 kPa, transition regime at matric suction of 10 kPa, and the residual regime at matric<br>suction of 50 kPa and 100 kPa. The testing result indicated that the cohesion intercept (c) is non-linearly<br>increasing with matric suction. The effective friction angle (φ′) is also increasing with matric suction. However,<br>the angle with respect to changes in matric suction (φb<br>) is gradually decreasing. According to the test result,<br>the active earth force (Pa) decreases with increasing matric suction. However, the bearing capacity was<br>increased with increasing matric suction. Therefore, the matric suction influences the size of the cantilever wall.<br>In conclusion, this research shows that matric suction influences the shear strength of Khon Kaen loess.<br>Furthermore, the unsaturated shear strength is useful and alternative to foundation design because the width of<br>the foundation is not excessive, saving material costs.<br><br></p>}, number={63}, journal={GEOMATE Journal}, author={S. Chatchawan and R. Nuntasarn}, year={2019}, month={May}, pages={172–180} }