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冻融循环对石灰粉土剪切强度特性的影响
引用本文:马巍,徐学祖,张立新.冻融循环对石灰粉土剪切强度特性的影响[J].岩土工程学报,1999,21(2):23-25.
作者姓名:马巍  徐学祖  张立新
作者单位:中科院兰州冰川冻土研究所冻土工程国家重点实验室;
摘    要:根据试验结果,讨论了冻融循环对石灰粉土剪切强度特性的影响。试验发现,反复冻结和融化强烈影响着石灰土的强度特性。一次冻融循环后,对未加石灰的粉土来说,其剪切强度变化不大,但是对石灰粉土来说,其剪切强度明显低于未冻融的,而且随冻融循环次数的增加,石灰粉土的剪切强度逐渐衰减,经历10次冻融循环的饱水石灰粉土强度最低。

关 键 词:冻融循环  石灰粉土  剪切强度  

Influence of frost and thaw cycles on shear strength of lime silt
Ma Wei,Xu Xuezu,Zhang Lixin.Influence of frost and thaw cycles on shear strength of lime silt[J].Chinese Journal of Geotechnical Engineering,1999,21(2):23-25.
Authors:Ma Wei  Xu Xuezu  Zhang Lixin
Affiliation:State Key Laboratory of Frozen Soil Engineering LIGG CAS Lanzhou 730000
Abstract:Results obtained from laboratory tests of lime silt under frost and thaw cycles show that the shear strengths of lime silt and silt do not change with confining pressure. For saturated and unsaturated lime silt, their strength values are all higher than that of silt and the greater the dry unit weight is, the higher the shear strength is. The shear strength of unsaturated lime silt is greater than that of the saturated lime silt. After 1 frost and thaw cycle, the shear strength of silt has a little change, but the shear strength of lime silt is obviously lower than that of lime silt before frost and thaw cycle. After many cycles of frost and thaw, the shear strength of lime silt gradually decreases with increasing cycles of frost and thaw, and after 10 cycles, it reaches to a minimum value.
Keywords:frost and thaw cycles  lime silt  shear strength
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