[1]杨寓友,王叶娇,程 岩.裂隙性对膨胀土抗剪强度的影响研究[J].西安建筑科技大学学报(自然科学版),2024,56(04):554-562.[doi:10.15986/j.1006-7930.2024.04.009]
　YANG Yuyou,WANG Yejiao,CHENG Yan.Research on the influence of fracture characteristics on shear strength of expansive soil[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2024,56(04):554-562.[doi:10.15986/j.1006-7930.2024.04.009]
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裂隙性对膨胀土抗剪强度的影响研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
56
期数:
2024年04期
页码:
554-562
栏目:
出版日期:
2024-08-28

文章信息/Info

Title:
Research on the influence of fracture characteristics on shear strength of expansive soil
文章编号:
1006-7930(2024)04-0554-09
作者:
杨寓友1; 王叶娇1; 程 岩2
(1.上海大学 力学与工程科学学院,上海 200444; 2.上海交通大学 船舶海洋与建筑工程学院,上海201100)
Author(s):
YANG Yuyou1; WANG Yejiao1; CHENG Yan2
(1.School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China; 2.School of Ocean and Civil Engineering,Shanghai Jiao Tong University, Shanghai 201100, China)
关键词:
膨胀土;  裂隙性;  抗剪强度;  黏聚力;  内摩擦角
Keywords:
expansive soil;  crack characteristics;  shear strength;  cohesion force;  internal friction angle
分类号:
TU443
DOI:
10.15986/j.1006-7930.2024.04.009
文献标志码:
A
摘要:
胀缩性、裂隙性是膨胀土的基本特性,膨胀土内部裂隙对边坡破坏有着巨大的影响,常引起工程事故.为研究裂隙性对膨胀土抗剪强度的影响,以南阳膨胀土作为研究对象,分别研究裂隙倾角、裂隙条数、裂隙形状等因素对膨胀土力学性质产生的影响.采用CT扫描试验观测了原状土内部裂隙发育情况; 通过对含有不同裂隙倾角、条数、形状以及不同裂隙间填充物情况的含裂隙土样进行直剪试验,分析裂隙性对膨胀土抗剪强度的影响.结果表明:裂隙的产生会破坏土体整体性,降低膨胀土抗剪强度; 裂隙条数增多,裂隙相互交汇会进一步降低土体强度; 膨胀土抗剪强度指标(黏聚力、内摩擦角)随裂隙面倾角的减小先减小后增大; 当裂隙面倾角为膨胀土破坏面倾角时其抗剪强度最低; 裂隙面倾角越接近破坏面倾角其抗剪强度越低,反之越高; 引入裂隙膨胀土黏聚力和内摩擦角的弱化度,建立了其抗剪强度指标随倾角变化的预测模型.
Abstract:
Swelling shrinkage and fissuring are the basic characteristics of expansive soil, and the internal cracks of expansive soil have a huge impact on slope failure, often causing engineering accidents. In order to study the influence of crack characteristics on the shear strength of expansive soil, Nanyang expansive soil is taken as the research object, and the effect of crack characteristics, such as dip angle, number and shape, on the mechanical properties of expansive soils were studied respectively. The CT scanning test was used to observe the development of internal cracks in undisturbed soil, and the influence of cracks on the shear strength of expansive soil was analyzed by direct shear test of fractured soil samples with different crack dip angles, numbers, shapes and fillers between different cracks. The experiment results show that the crack damages the integrity of the soil mass and decreases the shear strength. As cracks continue to develop, the intersection of cracks further damages the integrity of soils. The shear strength parameters of expansive soils(cohesion force and the interior friction angle)first decreases and then increases with the increasing crack dip angle. When the inclination angle of the fracture surface is the inclination angle of the failure surface of the expansive soil, the shear strength is the lowest. The closer the dip angle of the fracture surface is to the dip angle of the failure surface, the lower the shear strength is, and vice versa. The prediction model of shear strength index changing with dip angle is established by introducing the weakening degree of cohesion and internal friction angle of fractured expansive soil.

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相似文献/References:

[1]时伟,张亮,杨忠年,等.冻融循环条件下膨胀土力学特性试验研究[J].西安建筑科技大学学报(自然科学版),2019,51(04):480.[doi:10.15986/j.1006-7930.2019.04.003]
　SHI Wei,ZHANG Liang,YANG Zhongnian,et al.Experimental study on mechanical properties of expansive soilof artificial preparation under freeze-thaw cycle conditions[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2019,51(04):480.[doi:10.15986/j.1006-7930.2019.04.003]

备注/Memo

备注/Memo:
收稿日期:2023-04-06修回日期:2024-05-28
基金项目:国家自然科学基金(41702306)
第一作者:杨寓友(1997—),男,硕士生,主要从事非饱和土力学研究.E-mail:1025405701@qq.com
通信作者:王叶娇(1988-),女,博士,副教授,主要从事非饱和土力学研究.E-mail:yejiaowang@shu.edu.cn
更新日期/Last Update: 2024-08-28