| 受振动荷载扰动裂隙性黄土单轴压缩力学行为研究 |
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| 引用本文： | 许健,周立阳,胡科,李彦锋,武智鹏.受振动荷载扰动裂隙性黄土单轴压缩力学行为研究[J].岩土力学,2023,44(1):171-182. |
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| 作者姓名： | 许健 周立阳 胡科 李彦锋 武智鹏 |
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| 作者单位： | 1. 西安建筑科技大学 土木工程学院，陕西 西安 710055；2. 西安建筑科技大学 陕西省岩土与地下空间工程重点实验室，陕西 西安 710055 |
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| 基金项目： | 国家自然科学基金（No. 51878551）。 |
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| 摘 要： | 通过振动及单轴压缩试验，研究了受振动荷载扰动裂隙性黄土的单轴压缩力学行为。结果表明：裂隙性黄土的单轴压缩破坏模式表现为压裂破坏、滑移破坏、滑移-压裂复合破坏以及压剪破坏4种类型；振动扰动对单轴压缩条件下裂隙性黄土的破坏模式无显著影响，其破坏模式主要由初始裂隙的倾角控制。振动幅值和频率对裂隙性黄土应力-应变曲线的类型及特征无显著影响，不同振动参数条件下试样的应力-应变曲线均表现为应变软化型，且45°倾角试样的应力-应变曲线呈现出第二峰值强度高于第一峰值强度的“双峰”变化特征。单轴抗压强度随振动幅值和频率的增大均呈现出近似线性减小的变化规律；不同振动参数条件下试样单轴抗压强度随裂隙倾角增大近似呈现出“双V”变化特征。构建了受振动荷载扰动裂隙性黄土的二元介质本构模型，可较好预测其单轴压缩过程的应力-应变关系及单轴抗压强度。
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| 关 键 词： | 振动 裂隙性黄土 单轴压缩 二元介质本构模型 |
| 收稿时间： | 2022-03-07 |
Uniaxial compression behavior of fissured loess disturbed by vibration load |
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| XU Jian,ZHOU Li-yang,HU Ke,LI Yan-feng,WU Zhi-peng.Uniaxial compression behavior of fissured loess disturbed by vibration load[J].Rock and Soil Mechanics,2023,44(1):171-182. |
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| Authors: | XU Jian ZHOU Li-yang HU Ke LI Yan-feng WU Zhi-peng |
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| Institution: | 1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; 2. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China |
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| Abstract: | Uniaxial compression behavior of fissured loess after vibration was investigated by small-scale shaking table and uniaxial compression test. The test results show that the failure modes of fissured loess can be classified as four types, i.e. fracture failure, slip failure, coupled slip-fracture failure and compression-shear failure. The failure modes of fissured loess in uniaxial compression test are less affected by vibration, while it mainly controlled by fissure angle. Furthermore, vibration has little influence on the type and characteristic of the stress-strain curves, which constantly presents characteristics of strain softening. It is worth noting that the curves of loess samples with fissure angle of 45° show bimodal variation, and the second peak strength is generally larger than the first counterpart. The uniaxial compressive strength (UCS) approximately decreases linearly with growing vibration amplitude and frequency. With the increase of fissure angle, the UCS exhibits "double V" changes regardless of vibration parameters. A binary medium model is finally established, and it can well predict the stress-strain behavior and UCS of fissured loess after vibration. |
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| Keywords: | vibration fissured loess uniaxial compression binary medium constitutive model |
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