Viscoelastic Model Analysis of In-situ Pressuremter Creep Test in Permafrost
Zhang Hu,Zhang Jianming,Su Kai and Liu Shiwei
DOI:10.11835/j.issn.1674-4764.2013.06.004
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2013,Pages 22-27
- Abstract
In order to investigate the creep behavior of warm and ice-rich frozen soils, a number of pressuremeter tests were carried out in permafrost regions on the Qinghai-Tibetan Plateau with Menard pressuremeter. Then, the regression analysis results of the creep curves generated by Merchant model and relevant parameters were obtained. The test results indicate that the temperature plays a more important role than the water content in affecting the mechanical behavior of warm frozen soils. As pressure increases, the proportion of instantaneous strain in the total strain under each pressure decreases gradually. The regression results show that the instantaneous shear modulus increases linearly with decreasing temperature, but the delayed shear modulus as well as the viscous coefficient present a power function trend. Their peak values appear at the water content of 46%, which is rather different from the test result on lower temperature frozen soils.