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工程科学与技术:2019,51(1):112-120
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降雨强度与含石量对松散堆积体失稳影响研究
(1.西南科技大学 土木工程与建筑学院, 四川 绵阳 621010;2.工程材料与结构冲击振动四川省重点实验室, 四川 绵阳 621010;3.清华大学 水沙科学与水利水电工程国家重点实验室, 北京 100084)
Effect of Rainfall Intensity and Stone Content on the Instability of Quaternary Deposits
(1.School of Civil Eng. and Architecture, Southwest Univ. of Sci. and Technol., Mianyang 621010, China;2.Shock and Vibration of Eng. Materials and Structures Key Lab. of Sichuan Province, Mianyang 621010, China;3.State Key Lab. of Hydroscience and Eng., Tsinghua Univ., Beijing 100084, China)
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本文已被:浏览 1747次   下载 1129
投稿时间:2018-06-12    修订日期:2018-10-07
中文摘要: 地震、工程开挖及风化、侵蚀、搬运等地质作用形成大量的松散堆积体。堆积体中块石含量各异,在降雨诱发下失稳形成滑坡、泥石流等地质灾害,给当地居民生产生活和大型工程造成严重威胁。利用室内大型模型平台开展不同含石量和降雨强度的模型试验,分析含石量和降雨强度变化对松散堆积体变形失稳的影响。研究表明:降雨入渗过程中松散堆积体的体积含水率变化过程可分4个阶段。在Ⅰ阶段堆积体的含水率基本不变,Ⅱ阶段含水率快速增加,达到峰值后进入Ⅲ阶段,在此阶段中出现缓慢回落,降低到一定程度后进入Ⅳ阶段,此后体积含水率再次缓慢增大。含石量越大,相同降雨强度和时间时其体积含水率越小,后缘主张拉裂缝出现的时间越晚,对应的主张拉裂缝的宽度越小,坡体达到失稳破坏的时间越短。当降雨历时相同时,降雨强度越大,则体积含水率越大;降雨强度越大,松散堆积体失稳破坏时的体积含水率越高;不同降雨强度下,松散堆积体的体积含水率变化规律各不相同。降雨强度对松散堆积体的稳定性影响更加明显,降雨强度越大,松散堆积体的主张拉裂缝值越小,其主张拉裂缝出现时间、裂缝最大宽度、失稳时累积最大位移及失稳降雨历时降低越明显。研究结果为灾区松散堆积体降雨过程中失稳灾变的预测预报研究提供参考。
中文关键词: 松散堆石体  含石量  降雨强度  失稳
Abstract:The geological processes, including earthquake, engineering excavation, weathering, erosion and transport caused a large number of loose accumulation bodies. The stone content in these loose accumulation bodies were different, and the instability induced by rainfall leaded to geological disasters including landslides and debris flows, which seriously threaten the production and living of local residents and the operation of large projects. It is thus crucial to conduct the model tests of different stone content and rainfall intensity using the large scale model platform, and to analyze the influence of stone content and rainfall intensity on the deformation and instability of loose accumulation. The results showed that the evolution of volume water content could be divided into four stages during the rainfall process of loose accumulation. The moisture content almost remained unchanged in stageⅠ, and then increased rapidly in stageⅡ. In stage Ⅲ, the moisture content reached its peak value, and then lightly decreased; after this, the moisture content increase slowly in stage Ⅳ. The larger the rock content, the smaller the volume moisture content of the same rainfall intensity and time, and the earlier the tensile failure occurs at the back edge. The smaller width of the corresponding tensile failure, the shorter duration of the slope failure continues. When the rainfall duration was same, the greater the rainfall intensity, the greater the volume moisture content is. The higher the rainfall intensity, the higher the volume moisture content of the loose accumulation body. Under different rainfall intensities, the volume moisture content of loose accumulation body varies with each other. The stability influence of rainfall intensity on loose accumulation body was more obvious. The greater intensity of rainfall, the main tensile cracks of loose deposits were smaller, and the main tensile cracks time, the maximum crack width, and the instability of the maximum displacement cumulative rainfall duration decreased more significantly. The results would provide references for predicting the instability and calamity in loose accumulations during disaster area.
文章编号:201800672     中图分类号:P694    文献标志码:
基金项目:国家重点研发计划资助项目(2018YFC1505401);国家自然科学基金资助项目(41877524);四川省科技厅重点研发资助项目(2018SZ0345);清华大学水沙科学与水利水电工程国家重点实验室开放基金资助项目(sklhse-2016-D-04)
作者简介:韩培锋(1984-),男,讲师,博士.研究方向:工程地质灾害发生机理;岩土工程渗流.E-mail:hanpeifeng@yeah.net
引用文本:
韩培锋,樊晓一,田述军,张友谊.降雨强度与含石量对松散堆积体失稳影响研究[J].工程科学与技术,2019,51(1):112-120.
HAN Peifeng,FAN Xiaoyi,TIAN Shujun,ZHANG Youyi.Effect of Rainfall Intensity and Stone Content on the Instability of Quaternary Deposits[J].Advanced Engineering Sciences,2019,51(1):112-120.