一个考虑冻融循环作用的结构性定量参数的试验研究

郑郧; 马巍; 李国玉; 穆彦虎; 彭惠

doi:10.11779/CJGE201607023

一个考虑冻融循环作用的结构性定量参数的试验研究 English Version

郑郧^{1, 2},
马巍^1,,
李国玉¹,
穆彦虎¹,
彭惠³

1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州 730000；
2. 中国科学院大学,北京 100049；
3. 中交第一公路勘察设计研究院有限公司,陕西西安710056

基金项目: 国家重点基础研究发展计划（&#x0201c；973计划&#x0201d；）项目（2012CB026106）；国家自然科学基金优秀国家重点实验室研究项目（41023003）；甘肃省科技重大专项计划项目（143GKDA007）；中科院西部之光重点项目

详细信息

作者简介:
郑郧(1986- ),女,博士研究生,主要从事冻、融土结构性方面的研究工作。E-mail: yunzheng@lzb.ac.cn。

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出版历程
- 收稿日期: 2015-06-30
- 发布日期: 2016-07-24

Laboratory study on quantitative parameter of structural characteristics of soils considering effect of freeze-thaw cycles

ZHENG Yun^{1, 2},
MA Wei^1,,
LI Guo-yu¹,
MU Yan-hu¹,
PENG Hui³

1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. China Communications Construction Company First Highway Consultants Co., Ltd., Xi'an 710056, China

摘要

摘要: 土的结构性可以从本质上揭示土体的工程性质和行为本质。冻融循环对土体结构性有着非常重要的影响。在结构性定量参数“综合结构势”的基础上,增加考虑了冻融循环对土结构性的影响,提出了一个考虑冻融循环对土结构性的影响作用的结构性定量参数（简称冻融结构势）。并通过单轴压缩试验和单轴循环加卸载试验分别获得原状土、浸水饱和土及不同冻融循环次数下土样的单轴强度、失效应变、回弹模量和能量耗散,对用不同参数表示的冻融结构势进行了对比和分析。并利用CT扫描试验获得了不同冻融循环次数下土样中间截面的CT数均值,对冻融结构势进行了验证。认为不同参数表示的冻融结构势反映了土体结构性的不同方面,而用强度和能量耗散表示的冻融结构势能够较好地反映土结构性随冻融循环次数的变化情况,并提出在不同参数表示的冻融结构势之间的关系可能跟土质、加载方式等因素有关,明确了下一步的研究方向。
- 结构性 /
- 冻融循环 /
- 定量参数
Abstract: The structural characteristics of soils can essentially reveal the fundamentals of geotechnical behaviors. The freeze-thaw cycles have very important effect on them. Based on the quantitative structural parameter, comprehensive structural potential (CSP) proposed by Xie Dingyi, a modified structural parameter, a comprehensive structure potential with consideration of freeze-thaw cycles (CSPFT), is proposed. The routine uniaxial compression and uniaxial loading-unloading compression tests are conducted to get the 4 indexes of uniaxial compression strength, failure strain, resilient modulus and energy dissipation, which are used to constitute the CSPFT. The differences between CSPFTs constituted from the 4 indexes are also discussed. CT scanning of soil samples under different cycles is conducted to analyze the reliability of CSPFT, and CSPFTs of strength and energy dissipation are better than those of the other two ones. The relationships between the CSPFTs of different parameters rely on the soil types, stress paths and other factors, which are worth for further discussion.
- structural characteristic /
- freeze-thaw cycles /
- quantitative parameter

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参考文献(13)

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一个考虑冻融循环作用的结构性定量参数的试验研究 English Version

作者简介: 郑郧(1986- ),女,博士研究生,主要从事冻、融土结构性方面的研究工作。E-mail: yunzheng@lzb.ac.cn。

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出版历程

Laboratory study on quantitative parameter of structural characteristics of soils considering effect of freeze-thaw cycles

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出版历程

目录

作者简介:
郑郧(1986- ),女,博士研究生,主要从事冻、融土结构性方面的研究工作。E-mail: yunzheng@lzb.ac.cn。