单粒组冻结砂土三轴压缩颗粒破碎规律研究

陈榕; 孙鹤; 郝冬雪; 武智勇; 高宇聪

doi:10.11779/CJGE2022S1017

单粒组冻结砂土三轴压缩颗粒破碎规律研究 English Version

陈榕^{1, 2,},
孙鹤^{1, 3},
郝冬雪^{1, 2, ,},
武智勇^{1, 2},
高宇聪^{1, 2}

1.
东北电力大学, 建筑工程学院, 吉林吉林 132012
2.
东北电力大学, 吉林省电力基础设施安全评估与灾害防治重点实验室, 吉林吉林 132012
3.
贵州电网有限责任公司贵阳供电局, 贵州贵阳 550001

基金项目:

国家自然科学基金项目 52078108

吉林省科技厅中青年科技创新领军人才及团队项目 20210509058RQ

吉林省教育厅科学研究项目 JJKH20210103KJ

详细信息

作者简介:
陈榕(1979—)，男，辽宁沈阳人，博士，教授，主要从事土工合成材料加筋特性及软弱地基加固处理方法等方面的教学和科研工作。E-mail: lg1316cih@126.com

通讯作者:
郝冬雪, E-mail: haodongxue2005@126.com

中图分类号: TU432
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出版历程
- 收稿日期: 2022-09-21
- 网络出版日期: 2023-02-06
- 刊出日期: 2022-11-30

Particle breakage characteristics of frozen ideal uniform sands under triaxial compression

CHEN Rong^{1, 2,},
SUN He^{1, 3},
HAO Dong-xue^{1, 2, ,},
WU Zhi-yong^{1, 2},
GAO Yu-cong^{1, 2}

1.
School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, China
2.
Key Lab of Electric Power Infrastructure Safety Assessment and Disaster Prevention of Jilin Province, Northeast Electric Power University, Jilin 132012, China
3.
Guiyang Power Supply Bureau of Guizhou Power Grid, Guiyang 550001, China

摘要

摘要: 针对三种不同粒径的单粒组冻结砂土开展三轴剪切试验，重点研究剪切过程中冻结砂土颗粒破碎演化规律及粒径对冻土颗粒破碎的影响。结果表明：冻结温度为-1℃和-2℃时，围压 ${\sigma _3}$ ≥5 MPa情况下冻结砂土出现明显压融，并且在-1℃时由于局部快速压融导致冻结砂土出现抗剪强度低于未冻土现象；冻结砂土在剪切过程中出现颗粒破碎现象，颗粒破碎率随轴向应变增大持续增长，在高围压（ ${\sigma _3}$ ≥5 MPa）下甚至出现加速增长趋势；冻结砂土颗粒破碎率规律与未冻砂土不同，小粒组冻结砂土颗粒破碎率最大，该现象可能与冻土内部不同部位的冰晶作用有关。
- 冻结砂土 /
- 粒径影响 /
- 围压 /
- 颗粒破碎
Abstract: The triaxial shear tests on three groups of frozen ideal sands are carried out to investigate the evolution rules of particle breakage during shearing process and the effects of particle size on the particle breakage. It is shown that obvious pressure melting of sand samples takes place under -1℃ ~ -2℃ when σ₃ ≥5 MPa, and the strength of frozen sands is even less than the unfrozen strength due to rapid melting near shearing rupture plane at -1℃. The particle breakage of frozen sands occurs during shearing. The particle breakage rate continues to increase with the increase of the axial strain, and even develops with the acceleration after the peak strength under high confining pressure (σ₃ ≥5 MPa). The influences of the particle size of frozen sands on the breakage rate is different from those of unfrozen sands. The particle breakage rate of the frozen sands of small particle group is the largest, which may be related to the action of ice crystals in different parts of frozen soils.
- frozen sand /
- particle-size influence /
- confining pressure /
- particle breakage

HTML全文

不同温度下砂样d2的q– ${\varepsilon _1}$ 关系

Curves between q and ${\varepsilon _1}$ under different temperatures (Sample d2)

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不同温度下 ${q_{\text{f}}}$ 与 ${\sigma _3}$ 关系曲线（砂样d2）

Relationship between ${q_{\text{f}}}$ and ${\sigma _3}$ under different temperatures (Sample d2)

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三种粒径冻结砂土q– ${\varepsilon _1}$ 关系曲线

Relationship between q and ${\varepsilon _1}$ for frozen sands with different d₅₀

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图 4 不同温度下剪切结束后的颗粒相对破碎率

Values of B_r under different frozen temperatures ( ${\varepsilon _1}$ =20%)

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图 5 三种粒组砂样的颗粒相对破碎率

Figure 5. Relative breakage rates of three sand samples

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图 6 不同围压下相对破碎率的发展

Figure 6. Development of B_r under various confining pressures

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表 1 石英砂物理参数

Table 1 Physical parameters of quartz sand

砂样粒径范围d/mm d₅₀/mm e_max e_min e

d1 0.25~0.50 0.375 0.949 0.648 0.708

d2 0.50~1.00 0.75 0.804 0.552 0.602

d3 1.00~2.00 1.5 0.768 0.534 0.581

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参考文献(18)

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砂样	粒径范围d/mm	d₅₀/mm	e_max	e_min	e
d1	0.25~0.50	0.375	0.949	0.648	0.708
d2	0.50~1.00	0.75	0.804	0.552	0.602
d3	1.00~2.00	1.5	0.768	0.534	0.581

单粒组冻结砂土三轴压缩颗粒破碎规律研究 English Version

作者简介: 陈榕(1979—)，男，辽宁沈阳人，博士，教授，主要从事土工合成材料加筋特性及软弱地基加固处理方法等方面的教学和科研工作。E-mail: lg1316cih@126.com

通讯作者: 郝冬雪, E-mail: haodongxue2005@126.com

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出版历程

Particle breakage characteristics of frozen ideal uniform sands under triaxial compression

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出版历程

目录

作者简介:
陈榕(1979—)，男，辽宁沈阳人，博士，教授，主要从事土工合成材料加筋特性及软弱地基加固处理方法等方面的教学和科研工作。E-mail: lg1316cih@126.com

通讯作者:
郝冬雪, E-mail: haodongxue2005@126.com