Experimental Study on Compression Characteristics of Soft Soil Based on Temperature Effect
Abstract
Based on the characteristics of long annual freezing time and short suitable construction period of soft soil in cold region, the feasibility of foundation treatment of soft soil in freezing-thawing layer under freezing condition is discussed. The deformation characteristics of soft soil in freezing-thawing layer in HulunBuir area are studied by using two compression test methods of constant temperature and variable temperature and variable load, and the compressibility indexes under different temperatures and consolidation pressures are obtained. The test results show that the frozen-thawed soft soil has great compressibility, the maximum strain of constant temperature and variable load test is 19.89%, and the maximum compression of variable temperature and variable load test can reach 18.16%. The results of both constant temperature and variable temperature compression tests show that when the soil temperature is in the region of severe phase change (-1.5°C-0°C), the temperature change has the greatest influence on the compression coefficient of soil. The results of compression tests under variable temperature and load show that there will be some additional deformation under the action of temperature. When the soil is in a high consolidation pressure and the temperature is in the temperature transition zone (-1.5°C-0°C), the additional deformation is larger.References
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