磐安结构性黄土的构度及动强度衰减特性

doi:10.3981/j.issn.1000-7857.2016.05.008

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摘要以磐安黄土为样本,基于无侧限单轴抗压试验得到的磐安黄土构度指标,分析了原状黄土与重塑黄土的结构性差异;通过动三轴试验,对原状黄土、重塑黄土在天然含水率、饱和含水率条件下的动强度衰减特性进行了对比研究。结果表明,天然含水率的原状黄土及重塑黄土均具有较强的结构性,原状黄土的结构性更强,其动强度明显高于重塑黄土的动强度;虽然饱和过程使得原状黄土的动强度大大降低,但饱和原状黄土的动强度仍高于饱和重塑黄土的动强度,且饱和原状黄土的动孔压增长趋势明显慢于饱和重塑黄土;具有较强结构性的黄土,其动强度曲线不会出现归一化。

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	孙萍
	李荣建
	刘军定
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	张帅

关键词 ：黄土, 结构性, 构度, 动强度, 动孔压

Abstract：Based on the unconfined uniaxial compression tests of Pan'an loess, the structure index and the structure variations between the intact loess and the remolded loess are analyzed. Then, by means of dynamic triaxial tests, the comparison is performed for dynamic strength attenuation characteristics between natural intact loess, remolded loess, saturated intact loess and saturated remolded loess. Results show the followings. Owing to the structure of loess, the dynamic strength of natural intact loess with stronger structure is obviously higher than that of remodeled loess; though the saturation process makes the dynamic strength of intact loess reduced greatly, the dynamic strength of saturated intact loess is still higher than that of the saturated remodeled loess, and the dynamic pore pressure of saturated intact loess grows significantly slower than that of the saturated remodeled loess. In addition, the dynamic strength curves of loess with stronger structure will not be normalized.

Key words： loess structure structural index dynamic strength dynamic pore pressure

收稿日期: 2015-06-02

基金资助:国家自然科学基金项目(41472296,11072193);陕西省黄土力学与工程重点实验室项目(14JS064);中国地质调查局地质调查项目(12120114035901)

通讯作者: 李荣建(通信作者),教授,研究方向为黄土力学、岩土工程抗震及边坡工程,电子信箱:lirongjian@xaut.edu.cn E-mail: lirongjian@xaut.edu.cn

作者简介: 孙萍,副研究员,研究方向为岩土工程与地质灾害,电子信箱:sunpingcgs@163.com

引用本文:

孙萍, 李荣建, 刘军定, 张媛, 张帅. 磐安结构性黄土的构度及动强度衰减特性[J]. 科技导报, 2016, 34(5): 74-78.
SUN Ping, LI Rongjian, LIU Junding, ZHANG Yuan, ZHANG Shuai. Structural index and dynamic strength attenuation characteristics of structural loess in Pan'an. Science & Technology Review, 2016, 34(5): 74-78.

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http://www.kjdb.org/CN/10.3981/j.issn.1000-7857.2016.05.008 或 http://www.kjdb.org/CN/Y2016/V34/I5/74

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