| 低速缓动滑坡滑带土剪切蠕变特性 |
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| 引用本文： | 周静静,赵法锁,祝艳波,吴博,陈沛,宋飞,杨一帆.低速缓动滑坡滑带土剪切蠕变特性[J].中国地质灾害与防治学报,2020,31(1):107-112. |
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| 作者姓名： | 周静静 赵法锁 祝艳波 吴博 陈沛 宋飞 杨一帆 |
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| 作者单位： | 长安大学地质工程与测绘学院;西安科技大学高新学院 |
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| 基金项目： | 国家自然科学基金(41877247);国家重点研发计划项目(2017YFC0504700) |
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| 摘 要： | 滑带土的蠕变特性对低速缓动滑坡的形成演化过程起着控制性作用。本文选取典型的低速缓动滑坡—二庄科北区滑坡的滑带土为研究对象,在不同正应力水平作用下,通过对该滑带土的饱和试样进行直剪蠕变试验,研究了它的剪切蠕变特性。结果表明:该滑带土具有明显的蠕变特性,均包括瞬时变形、衰减蠕变和稳态蠕变3个阶段;随着剪切荷载的增大,衰减蠕变阶段及瞬时变形阶段的变形量均增大,衰减蠕变持续时间更长;其等时应力—应变曲线呈现出非线性特征,且曲线具有明显拐点;在长期荷载作用下出现强度损失,且正应力越大,强度损失越大;随着时间增大,衰减蠕变阶段的剪应变率越来越小,且剪应力越大,剪应变率越大;在蠕变破坏前的阶段,剪应变率随正应力增大而减小,即滑坡埋深越深,滑速越慢。
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| 关 键 词： | 低速缓动滑坡 滑带土 直剪蠕变试验 蠕变特性 剪应变率 |
Shear creep properties for sliding-zone soil of the slow-moving landslides |
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| ZHOU Jingjing,ZHAO Fasuo,ZHU Yanbo,WU Bo,CHEN Pei,SONG Fei,YANG Yifan.Shear creep properties for sliding-zone soil of the slow-moving landslides[J].The Chinese Journal of Geological Hazard and Control,2020,31(1):107-112. |
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| Authors: | ZHOU Jingjing ZHAO Fasuo ZHU Yanbo WU Bo CHEN Pei SONG Fei YANG Yifan |
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| Affiliation: | (College of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, China;Xi’an Kedagaoxin University,Xi’an, Shaanxi 710109,China) |
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| Abstract: | The creep properties of the slip zone soil play a controlling role in the formation and evolution of slow-moving landslides.In this paper,the slip zone soil of a typical slow-moving landslide,Erzhuangke north district landslide,was selected as the research object.In order to study its shear creep properties,the direct shear creep test for the saturated sample of the slip zone soil was carried out with different normal stress levels.The results show that the slip zone has obvious creep characteristics,including transient deformation,decay creep and steady creep.The deformation of the decay creep and transient deformation stage increases with the increase of shear load,and decay creep lasts longer.The isochronous stress-strain curve exhibits nonlinear characteristics,and it has anobvious inflection point.The strength loss occurs under the long-term load,and the larger the normal stress,the more the strength loss.The shear strain rate in the decay creep stage becomes smaller and smaller over time.And the shear strain rate increases with the increase of shear stress.The shear strain rate decreases with the increase of normal stress before the creep damage starts.That means,the deeper the landslide depth,the slower the slip speed. |
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| Keywords: | slow-moving landslides sliding-zone soil shear creep tests creep properties shear strain rate |
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