In order to obtain influence of matric suction on relaxation properties of unsaturated soil, we conduct stress relaxation tests of unsaturated soil of a landslide in Three Gorges Reservoir area by using GDS triaxial apparatus. Exponential function, logarithmic function and power function are selected for curve fitting. Through comparative analysis, power function is selected as the relaxation model as it has maximum fitting accuracy, and the model parameters under different matric suctions are obtained. The correlations between matric suctions and model parameters are analyzed, and function relationships are built. The function relationships are substituted into the relaxation model equation and a relaxation model that can reflect the effect of matric suction of unsaturated soil is obtained.
Key words
landslide /
unsaturated soil /
matric suction /
relaxation model /
relaxation properties
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References
[1] 孙广忠.中国典型滑坡[M].北京:科学出版社,1998.
[2] 李翠华,侍 倩,李百鸣.饱和软粘土松弛特性试验研究及模型建立[J].土工基础,2001, 15(3): 38-40.
[3] 尹清杰,王世梅.饱和土松弛实验曲线模拟与试验验证[J].黑龙江水专学报,2006, 33(2): 24-26.
[4] 肖宏彬,范志强,张春顺,等.性流变特性试验研究[J].公路工程,2009,34(2):2-5.
[5] 王 琛,詹传妮.堆石料的三轴松弛试验[J].四川大学学报(工程科学版),2011,43(1):27-30.
[6] 李孝平,王世梅,李晓云,等.GDS三轴仪的非饱和土试验操作方法[J].三峡大学学报(自然科学版),2008,30(5): 37-40.
[7] 王世梅,刘德富,陈 勇,等. 某滑坡滑带非饱和土强度特性试验研究[J].合肥工业大学学报(自然科学版),2005,28(12): 1578-1581.
[8] 李佳川.土的流变模型及应力松弛[J].岩土工程师,1990,2(4):27-31.
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