Investigation of Frozen Soil Behavior under Unconfined Compression Test

Artificial ground freezing is known as one of the soil improvement methods. We also know that moTo investigate the effect of soil particle size, two different sand sizes, including 0.25 mm and 0.15 mm, were used. Which is mixed with clay in certain proportions. In this study, to evaluate the compressive strength, a uniaxial compression test with 10 different soil compositions and 4% different moisture has been used. 40 compounds were examined at 3 different freezing times. At the output of the test results, the axial stress-strain curves generally show the strain softening state. The resistance of the samples is approximately the same, in a shorter period of time. With increasing age of freezing, stress due to the presence of clay shows different values. So that with increasing the age of freezing, the sample with a low percentage of clay did not increase stress tolerance. And after a constant value, it does not increase. For example, at a freezing age of 24 hours and a moisture level of 15%, a sample containing 50% clay withstands stress of up to 208.5 kPa., Whereas these varieties, for soil with 10% clay and the same humidity, is equals to 265.4 kPa (24 hours of freezing time) and to 283.8 kPa (72 hours of freezing time). The strength significantly decreases to about 36%, but the test routine is still maintained and does not change. Finally, it can be said that samples with 30% clay have the highest shear strength in most cases.