高温冻土抗拉强度试验研究

doi:10.13722/j.cnki.jrme.2017.1168

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摘要

高温冻土抗拉强度是分凝冰形成准则中的重要参数，对于土体冻胀过程中的分凝冰形成判定具有重要意义。为研究高温冻土抗拉强度，采用径向压裂法对青藏高原高温冻土进行巴西劈裂试验，获得高温冻土抗拉强度随温度变化规律：0 ℃～－0.4 ℃，高温冻土抗拉强度随温度降低而增大，且增大幅度随温度降低而减小；－0.4 ℃～－2.0 ℃，抗拉强度随温度降低线性增大。将试验获取的高温冻土抗拉强度拟合函数代入分凝冰形成准则，利用冻胀模型进行冻胀量的计算，与同条件下的试验结果进行对比，验证了高温冻土抗拉强度试验方法和结果的可靠性，为土体冻胀模型的应用提供了重要参数。

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	胡坤1
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	封金财1
	杨兆1

关键词 ：土力学, 高温冻土, 径向压裂, 抗拉强度, 冻胀模型, 试验

Abstract：

The tensile strength of high-temperature frozen soils is an important parameter for the criterion of ice segregation. In order to research on tensile strength of high-temperature frozen soils，split tests were used to acquire the tensile strength of Tibetan frozen soils. The results showed that tensile strength increased with the decrease of temperature，however，the increasing rate decreased during 0 ℃–－0.4 ℃. The tensile strength increased linearly by the decrease of temperature during －0.4 ℃–－2.0 ℃. Moreover，fitting functions of tensile strength were obtained，which provided important parameters for the criterion of ice segregation and the application of frost heave model. The fitting functions were used to calculate frost heave，the calculated results agreed well with the experimental results.

Key words： soil mechanics high-temperature frozen soils split tests tensile strength frost heave model tests

引用本文:

胡坤1，2，封金财1，杨兆1. 高温冻土抗拉强度试验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4267-4275.
HU Kun1，2，FENG Jincai1，YANG Zhao1. Tests on tensile strength of high-temperature frozen soils. , 2017, 36(S2): 4267-4275.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1168 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4267

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