[1]张冲,袁胜洋,田凯元,等.湿化对新疆地区粗粒混合土力学特性影响试验[J].长安大学学报(自然科学版),2025,45(3):52-64.[doi:10.19721/j.cnki.1671-8879.2025.03.005]
　ZHANG Chong,YUAN Sheng-yang,TIAN Kai-yuan,et al.Test on wetting influence on mechanical characteristics of coarse-grained mixed soil in Xinjiang area[J].Journal of Chang’an University (Natural Science Edition),2025,45(3):52-64.[doi:10.19721/j.cnki.1671-8879.2025.03.005]
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湿化对新疆地区粗粒混合土力学特性影响试验()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年3期
页码:
52-64
栏目:
道路工程
出版日期:
2025-05-31

文章信息/Info

Title:
Test on wetting influence on mechanical characteristics of coarse-grained mixed soil in Xinjiang area
文章编号:
1671-8879(2025)03-0052-13
作者:
张冲1; 2; 袁胜洋1; 2; 田凯元1; 2; 刘杰3; 刘学军4; 祁延录5; 刘先峰1; 2
(1. 西南交通大学 土木工程学院,四川 成都 610031; 2. 西南交通大学 高速铁路线路工程教育部重点实验室,四川 成都 610031; 3. 新疆交通规划勘察设计研究院有限公司,新疆 乌鲁木齐 830006; 4. 新疆建筑科学研究院(有限责任公司),新疆 乌鲁木齐 830002; 5. 新疆铁道勘察设计院有限公司,新疆 乌鲁木齐 830011)
Author(s):
ZHANG Chong1; 2;  YUAN Sheng-yang1; 2;  TIAN Kai-yuan1; 2;  LIU Jie3;  LIU Xue-jun4; QI Yan-lu5;  LIU Xian-feng1; 2
关键词:
道路工程;  粗粒混合土;  试验研究;  力学特性
Keywords:
road engineering;  coarse-grained mixed soil;  test research;  mechanical property
分类号:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.03.005
文献标志码:
A
摘要:
为了探究浸水湿化对新疆地区粗粒混合土的力学特性影响,以吐鲁番地区的砾质土为研究对象,针对采用等比例缩尺法缩尺后的复配粗粒混合土开展击实与三轴试验,分析不同含水率粗粒混合土击实后的颗粒破碎量,研究湿化对粗粒混合土的剪切变形、孔隙比、抗剪强度等力学指标的影响规律。研究结果表明:粗粒混合土在击实后的颗粒破碎量随含水率的增加而逐渐减小,天然含水率为2%左右时有最大颗粒破碎量; 破碎可能性在颗粒粒径小于5 mm后显著降低。所有试样在剪切中均表现为先剪缩后剪胀的体应变发展规律,且剪胀性随围压增大逐渐降低; 由于水膜的润滑作用,湿化后土体的剪胀性进一步减小,当围压达到150 kPa后,湿化土样在剪切结束时的总体变接近于0; 试样的弹性模量随围压增大近似线性增长,剪胀角减小显著,泊松比略有减小; 湿化后不同围压下试样弹性模量发生衰减,且衰减值相近,剪胀角因水分作用进一步降低,但土体的泊松比受围压及湿化作用影响较小; 粗粒混合土的黏聚力随着土体湿化没有明显变化,而内摩擦角减小了约15%; 土骨架湿化后的强度衰减更多源于水分降低了粗颗粒之间的滑动摩擦。研究成果可为深入探究粗粒混合土的湿陷机理及本构关系、分析粗颗粒混合土质地基的稳定性提供参考。
Abstract:
In order to investigate the influence of wetting on the mechanical properties of coarse-grained mixed soil in Xinjiang region, the gravelly soil in Turpan area was taken as the research object, and compaction and triaxial test were carried out on the mixed coarse-grained soil after scaled by equal proportion scaling method. The particle breakage of coarse-grained mixed soil with different moisture contents was analyzed. The effects of wetting on the shear deformation, pore ratio, shear strength and other mechanical indexes of coarse-grained mixed soil were studied. The results show that the particle breakage rate of coarse-grained mixed soil in compaction decreases with the increase of water content, and there is the maximum particle breakage when the natural water content is about 2%. The possibility of breakage decreases significantly after the particle size is less than 5mm. All specimens show the development law of volumetric strain of contraction first and then dilatancy in shear, while the dilatancy gradually decreases with the increase of confining pressure. Due to the lubrication of water film, the dilatancy of the soil after wetting is further reduced. When the confining pressure reaches 150 kPa, the overall volumetric strain of the wetted soil sample at the end of the shear is close to 0. The elastic modulus of the sample increases approximately linearly with the increase of confining pressure, the dilatancy angle decreases significantly, and the Poisson's ratio decreases slightly. After wetting, the elastic modulus of the sample attenuates under different confining pressures, and the attenuation values are similar. The dilatancy angle is further reduced due to water action, but the Poisson's ratio of the soil is less affected by confining pressure and wetting. The cohesion of coarse-grained mixed soil does not change significantly with soil wetting, while the internal friction angle decreases by about 15%. The strength attenuation of soil skeleton after wetting is more due to the fact that water reduces the sliding friction between coarse particles. The research results can provide a reference for further exploring the collapsibility mechanism and constitutive relationship of coarse-grained mixed soil and analyzing the stability of foundation.1 tab, 17 figs, 37 refs.

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备注/Memo

备注/Memo:
收稿日期:2024-12-17
基金项目:国家自然科学基金项目(52168066)
作者简介:张 冲(1995-),男,湖北宜昌人,工学博士研究生,E-mail:civilzc@my.swjtu.edu.cn。
通信作者:袁胜洋(1987-),男,四川泸州人,副教授,工学博士,E-mail:shengyang.yuan@swjtu.edu.cn。
更新日期/Last Update: 2025-05-30