| 冻结黄土抗拉强度的试验研究 |
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| 引用本文： | 沈忠言,彭万巍.冻结黄土抗拉强度的试验研究[J].冰川冻土,1995,17(4):315-321. |
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| 作者姓名： | 沈忠言 彭万巍 |
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| 作者单位： | 中国科学院兰州冰川冻土研究所冻土工程国家重点实验室 |
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| 摘 要： | 冻结饱水黄土的拉伸试验表明，拉伸破坏均属脆性破坏类型，拉断面上矿物颗粒剪移错粒，裂隙发育。拉伸的应力－应变过程，视荷载作用的快慢大致可分为粘弹－塑性、粘－弹性有脆性破坏三类，它们可用统一的方程形式加以描述，此外，对饱水冻结黄土的峰值应力、破坏应变和破坏时间等特性进行了分析，对抗拉、抗压强度作分析比较后指出，它们的比值为０．４４－０．６３，与负温和加载速率的关系不大。
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| 关 键 词： | 抗拉强度 峰值应力 冻土 冻结黄土 试验研究 |
Tensile Strength of Frozen Saturated Loess |
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| Shen Zhongyan, Peng Wanwei and Liu Yongzhi.Tensile Strength of Frozen Saturated Loess[J].Journal of Glaciology and Geocryology,1995,17(4):315-321. |
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| Authors: | Shen Zhongyan Peng Wanwei and Liu Yongzhi |
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| Abstract: | Tensile tests on the frozen saturated loess show that their failure is brittle. Shear and displacement of the mineral grain occur and mini-fissures grow on the cross section of the crack. The stress-strain processes of the tensile are classified into three types depending on the load rates i.e.viscoelastic-plastic, viscoelastic and brittle deformation. They may be described by an unitized expression. The features of stress-strain, peak stress, strain and time to failure of frozen saturated loess are also discussed in this paper. The ratio of tensile strength to compressive strength is 0.44-0.63 independently of the temperature and load rate. |
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| Keywords: | tensile strength peak stress strain rate temperature |
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