[1]董辉,罗潇,史超,等.气阻作用下堆积碎石土渗透规律[J].山地学报,2015,(03):365.
　DONG Hui,LUO Xiao,et al.Seepage Regulation of Aggregate Gravel Soil under the Effect of Air Entrapment[J].Mountain Research,2015,(03):365.
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气阻作用下堆积碎石土渗透规律()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2015年03期
页码:
365
栏目:
山地灾害
出版日期:
2015-06-01

文章信息/Info

Title:
Seepage Regulation of Aggregate Gravel Soil under the Effect of Air Entrapment
作者:
董辉;罗潇;史超;罗有为;
湘潭大学土木工程与力学学院;湘潭大学流变力学研究所;
Author(s):
DONG Hui; LUO Xiao; SHI Cao; LUO Youwei
1.College of Civil Engineering and Mechanics，Xiangtan University，Xiangtan 411105，Hunan，China; 2.Institute of Rheological Mechanics，Xiangtan University，Xiangtan 411105，Hunan，China
关键词:
碎石土; 滑坡; 渗透规律; 气阻作用; 雨强
Keywords:
gravel soil; landslide; seepage regulation; air entrapment effects; rainfall intensity
分类号:
P642.11
文献标志码:
A
摘要:
降雨过程中,堆积碎石土渗透特性改变是触发滑坡等灾害的主要因素。碎石土中封闭气泡阻碍水相流动,从而对雨水入渗产生影响。通过自制渗流沉降综合测试仪,进行入渗试验,探究不同雨强(1.2 mm/min、1.6mm/min、2.0 mm/min)下,碎石土的渗透规律与沉降变形。通过Seep/w软件耦合Air/w软件进一步分析不同雨强下气阻作用对湿润锋迁移速度的影响。结果表明:入渗深度-时间曲线存在阶梯状趋势,即湿润锋迁移速度首先随表层土含水率的突增迅速增加至最大值(约30~40 mm/min),然后随气压的增加缓慢减小,最后湿润锋迁移速度随气压减小略微增大,湿润锋平均迁移速率(无积水状态)随雨强的增大趋...
Abstract:
During the rainfall，the main factor for triggering landslides and other disasters is the changing of aggregate gravel soil permeability. Specifically，the entrapped air in gravel soils impedes aqueous phase flow，thus will have an effect on the rainwater permeability. The experiment of infiltration under different rainfall intensity (1.2 mm/min，1.6 mm/min，2.0 mm/min)，investigates the permeability of gravel soil and sedimentation deformation by our own infiltration and sedimentation integrated tester. Then，further research will focus on the relationship between the air entrapment impact with different rainfall intensity and wetting front migration rate through Seep/w and Air/w soft wares. The results show that：there is stepladder trend between wetting front and time curve. More specifically，wetting front migration rate will rapidly increase with the sudden increase of the topsoil moisture to a maximum (30~40 mm/min approximately)，then will slowly decrease with increased pressure. Finally the wetting front migration rate will slightly increase with the decreased pressure. The average rate of wetting front migration (without hydrops water) approach linear growth with the increased rainfall intensity. Development of soil settlement deformation passes through three stages：slow growth，sharply rises and gradually stagnation. The minimum time (approximately 50 min) for sharp morph and sedimentation of gravel soil with the rainfall intensity is 2.0 mm/min. There is a negative linear correlation between the permeability coefficient of gravel soil and the dry density.

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备注/Memo

备注/Memo:
收稿日期(Received date)：2014-08-13；修回日期（Accepted）：2014-10-11。
基金项目（Foundation item）：国家自然科学基金资助项目（No. 51108397；No. 51308485）；湖南省自然科学
基金项目（12JJ4006）。[Funded by National Natural Science Foundation of China (Grant No. 51108397, 51308485) and Natural Science Foundation of Hunan Province (Grant No. 12JJ4006).]
作者简介（Biography）：董辉（1976-），男，博士，副教授，研究方向：环境地质灾害，[Dong Hui, male, Ph D, associate professor, majoring in environment geology hazard.] E-mail: aneurin.h.d@gmail.com
更新日期/Last Update: 1900-01-01