Laserfiche WebLink
cohesion" . With damp , low cohesion soils , this extra strength is <br /> due to compress i ve forces exerted on the so i 1 part i c 1 es as a resu 1 t <br /> of surface tensions where water menisci have formed between soil <br /> particles . The extra shearing strength exists as long as this <br /> amount of water is present . If the soil dries out or becomes , <br /> saturated , this extra strength is lost . To account for this in the <br /> stability analyses , some cases will be run at slightly lower <br /> cohesions . <br /> Although the direct shear tests were conducted in technically the <br /> 'undrained" condition , the samples had approximately 8 to 10% <br /> moisture , which is near optimum. Undrained tests conducted in the <br /> saturated condition do not use an internal angle of friction or <br /> pore pressure ratio in the analysis , which is typical for clays . <br /> Since the material was not saturated and is more like a low <br /> cohesion soil , internal angles of friction and pore pressure ratios <br /> should be used in the total stress analysis . <br />