[1]包卫星,李 伟,毛雪松,等.冻融循环条件下盐渍化风积沙力学特性[J].交通运输工程学报,2023,23(06):114-124.[doi:10.19818/j.cnki.1671-1637.2023.06.005]
　BAO Wei-xing,LI Wei,MAO Xue-song,et al.Mechanical properties of salinized aeolian sand under freeze-thaw cycles[J].Journal of Traffic and Transportation Engineering,2023,23(06):114-124.[doi:10.19818/j.cnki.1671-1637.2023.06.005]
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冻融循环条件下盐渍化风积沙力学特性()
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《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

卷:
第23卷
期数:
2023年06期
页码:
114-124
栏目:
道路与铁道工程
出版日期:
2023-12-30

文章信息/Info

Title:
Mechanical properties of salinized aeolian sand under freeze-thaw cycles
文章编号:
1671-1637(2023)06-0114-11
作者:
包卫星; 李 伟; 毛雪松; 陈 锐; 秦 川; 刘亚伦
(长安大学 公路学院,陕西 西安 710064)
Author(s):
BAO Wei-xing;  LI Wei;  MAO Xue-song;  CHEN Rui;  QIN Chuan;  LIU Ya-lun
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
关键词:
路基工程;  风积沙;  三轴试验;  冻融循环;  含盐量;  应力-应变;  劣化模型
Keywords:
subgrade engineering;  aeolian sand;  triaxial test;  freeze-thaw cycle;  salt content;  stress-strain;  deterioration model
分类号:
U416.1
DOI:
10.19818/j.cnki.1671-1637.2023.06.005
文献标志码:
A
摘要:
为研究季冻区沙漠边缘盐渍化风积沙力学特性,在冻融循环条件下对不同含盐量风积沙开展了三轴不固结不排水剪切试验,为研究冻融循环后不同含盐量风积沙应力-应变关系曲线与抗剪强度的劣化规律,提出了一种考虑围压与冻融循环次数条件下修正的邓肯-张模型,并引入抗剪强度劣化度描述风积沙强度衰减速度,提出了冻融循环次数与含盐量对风积沙抗剪强度的耦合作用计算公式。研究结果表明:不同冻融循环次数、含盐量与围压下风积沙应力-应变曲线均表现为应变软化型,冻融循环状态下的盐渍化风积沙受到温度与盐分的耦合作用,随着冻融循环次数与含盐量的增加,风积沙应变软化速率显著降低; 修正的邓肯-张模型可以较好地描述风积沙应变软化特征,不同冻融循环次数下风积沙初始回弹模量随围压增大而增大,随冻融循环次数增加先减小后缓慢增加; 在冻融条件下,无盐风积沙抗剪强度劣化速率较慢,而对于含盐风积沙,土中的盐分与水分相变加快了风积沙抗剪强度的劣化速率,使得风积沙抗剪强度迅速降低; 对于不同围压下的风积沙,其强度变化规律相似,即在经历初次冻融循环后抗剪强度显著下降,并随着冻融循环次数的增加,强度劣化速率逐渐趋于稳定,风积沙抗剪强度劣化度随冻融循环次数增加呈双曲线递增,随含盐量的增大呈线性递增趋势。
Abstract:
In order to study the mechanical properties of salinized aeolian sand at the edge of the desert in the monsoon freezing zone, triaxial unconsolidated and undrained shear tests were carried out on the aeolian sands with different salt contents under freeze-thaw cycle conditions. To study the stress-strain relationship curves and deterioration laws of shear strengths of aeolian sands with different salt contents after freeze-thaw cycles, a modified Duncan-Zhang model considering the conditions of perimeter pressure and the number of freeze-thaw cycles was proposed. The shear strength deterioration degree was introduced to describe the rate of strength decay of aeolian sand, and the formula for calculating the coupling effect of the number of freeze-thaw cycles and salt content on the shear strength of aeolian sand was proposed. Research results show that the stress-strain curves of aeolian sands with different numbers of freeze-thaw cycles, salt contents, and perimeter pressures are all the strain-softening type. The salinized aeolian sand under freeze-thaw cycles is subjected to the coupling of temperature and salinity, and the strain softening rate of aeolian sand decreases significantly with the increases in the number of freeze-thaw cycles and salt content. The modified Duncan-Zhang model can better characterize the strain softening of aeolian sand. The initial resilience moduli of aeolian sand under different numbers of freeze-thaw cycles increase with the increase in the perimeter pressure, and decrease first and then increase slowly with the number of freeze-thaw cycles. Under the freeze-thaw conditions, the deterioration rate of shear strength of unsalted aeolian sand is slow. In the case of the salinized aeolian sand, the phase changes in the salt and moisture in the soil accelerate the deterioration rate of aeolian sand shear strength, leading to a rapid decrease in the shear strength of aeolian sand. For the aeolian sand under different perimeter pressures, the patterns of strength change are similar, and the shear strengths decrease significantly after the initial freeze-thaw cycle. As the number of freeze-thaw cycles increases, the deterioration rates of strength are gradually stable. The shear strength deterioration degree of aeolian sand increases hyperbolically with the number of freeze-thaw cycles and linearly with salt content. 3 tabs, 10 figs, 28 refs.

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备注/Memo

备注/Memo:
收稿日期:2023-06-27
基金项目:国家自然科学基金项目(51878064); 新疆维吾尔自治区重大科技专项项目(2020A03003-7); 陕西省自然科学基础研究计划项目(2021JM-180); 中央高校基本科研业务费专项资金项目(300102211302)
作者简介:包卫星(1979-),男,新疆乌鲁木齐人,长安大学教授,工学博士,从事特殊土路基工程性质、灾变机理与处治研究。
更新日期/Last Update: 2023-12-30