| 一种气泡轻质土路基受载-破坏模型试验 |
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| 引用本文： | 杨琪,张友谊,刘华强,秦华.一种气泡轻质土路基受载-破坏模型试验[J].岩土力学,2018,39(9):3121-3129. |
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| 作者姓名： | 杨琪 张友谊 刘华强 秦华 |
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| 作者单位： | 1. 西南科技大学 土木工程与建筑学院，四川 绵阳 621010；2. 四川省交通运输厅交通勘察设计研究院，四川 成都 610017 |
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| 基金项目： | 四川省交通科技项目（No.2015B1-6）。 |
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| 摘 要： | 针对某原型工程采用的新型气泡轻质填土路基，通过室内相似模型试验和UDEC数值模拟相结合分析的手段，研究该气泡轻质土路基在受载-破坏过程中的变形特征和受力破坏机制，得到了该过程中路基内部的应变变化、应力分布以及沉降变形规律等数据。研究表明：该种气泡轻质土路基在受载-破坏过程中，内部老路基首先发生变形，当荷载达到175 kPa后，中层左侧轻质土路基内部最先发生塑性变形直至破坏；轻质土路基与老路基交接处易受老路基沉降变形与轻质土路基破坏变形的共同作用而产生弯剪破坏裂缝，最终导致路基失稳；该气泡轻质土路基受载-破坏模式是一个由内而外的从弹性变形到塑性屈服，最终发生弯剪破坏的过程，即先局部破坏再整体失稳；纵向上老路基的应力传递比轻质土路基小；一定荷载范围（小于100 kPa）内，路基变形程度与路基深度成反比。
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| 关 键 词： | 气泡轻质填土路基 变形特征 破坏机制 数值模拟 |
| 收稿时间： | 2016-11-08 |
Model test on load-failure of a foamed lightweight soil subgrade |
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| YANG Qi,ZHANG You-yi,LIU Hua-qiang,QIN Hua.Model test on load-failure of a foamed lightweight soil subgrade[J].Rock and Soil Mechanics,2018,39(9):3121-3129. |
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| Authors: | YANG Qi ZHANG You-yi LIU Hua-qiang QIN Hua |
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| Institution: | 1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; 2. Sichuan Communication Survey and Design Institute, Chengdu, Sichuan 610017, China |
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| Abstract: | Based on model experiment and UDEC simulation combined analysis method, the deformation characteristics and damage mechanism in the process of load-failure of a new type foamed lightweight soil subgrade were studied. The variation of strain, stress distribution and the law of deformation in the process were obtained. The results show that in the process of load-failure of the lightweight soil subgrade, the inner old roadbed is first to deform. When the load reached 175 kPa, plastic deformation firstly occurs in the middle of the subgrade at the left side. The junction between lightweight soil subgrade and old subgrade is easily affected by the interaction between old subgrade settlement deformation and new subgrade failure deformation, resulting in bending shear failure crack, and finally causing damage. The foamed lightweight soil subgrade load-failure mode is from inside to outside with elastic deformation to plastic yield, finally to shear failure (local damage to overall instability). In the longitudinal direction, the stress transfer of the old roadbed is smaller than that of the lightweight soil roadbed. Within a certain load range (less than 100 kPa), the deformation of the subgrade is inversely proportional to the depth of the subgrade. |
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| Keywords: | foamed lightweight soil subgrade deformation characteristics failure mechanism simulation |
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