[1]谢凯,余宏明,彭祖武,等.河南省栾川县泥石流源地土大直剪试验[J].山地学报,2013,(06):738.
　XIE Kai,YU Hongming,PENG Zuwu,et al.Large Scale Direct Shear Test of Debris Flow Source Soil in Luanchuan of Henan[J].Mountain Research,2013,(06):738.
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河南省栾川县泥石流源地土大直剪试验()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2013年06期
页码:
738
栏目:
山地灾害
出版日期:
2013-01-01

文章信息/Info

Title:
Large Scale Direct Shear Test of Debris Flow Source Soil in Luanchuan of Henan
作者:
谢凯;余宏明;彭祖武;李科;王硕楠;陈鹏宇;
中国地质大学（武汉），湖北 武汉 430074
Author(s):
XIE Kai; YU Hongming; PENG Zuwu; LI Ke; WANG Shuonan; CHEN Pengyu
China University of Geosciences，Wuhan 430074，China
关键词:
泥石流固体物源; 大直剪试验; 饱水情况; 抗剪强度
Keywords:
debris flow solid source materials; large scale direct shear test; watersaturated circumstances; shear strength
分类号:
P642，TU41
文献标志码:
A
摘要:
栾川县泥石流为降雨型泥石流,降水对泥石流源地土的强度影响较大。对栾川县自然泥石流土样(沟谷型、坡面型)和人为泥石流土样(矿渣)分别在天然含水量、快速饱和、饱和3 h条件下进行大型直接剪切试验,得到抗剪强度指标c、φ和强度包线与含水量的关系,以及不同含水状态剪应力与位移关系。结果表明,除矿渣粘粒含量太少,c值趋近于0外,矿渣φ和其他土样c、φ在天然含水量到饱和状态是明显降低的,饱和状态下剪应力-水平位移曲线有明显的波动,并在饱和3 h后,土样的抗剪强度进一步小幅度降低。一定条件下的前期降雨对泥石流的发生贡献很大。前期降雨充足,源地土体快速饱水,土体的抗剪强度明显降低,在重力和径流冲蚀作用下易破坏...
Abstract:
Most of debris flows are rainfall induced in Luanchuan of Henan，China. The rainfall has a greater impact on the strength of debris flow source region soil. The soil samples of natural debris flow（Gullies, Hillslopes） and artificial debris flow (Slag) in Luanchuan are tested with large scale direct shear apparatus under the condition of natural water content, rapid saturation and saturation for 3 hours. The relationship between c, φ, strength envelope and water content, and the relationship between shearing stress and horizontal displacement under the condition of different water content are obtained. The results show that, excepting the c of soil sample of slag with little clay tending to be 0, the φ of slag sample and other soil samples’ c and φ are decreased under the condition of water content from nature to saturation. The curve of shear streehorizontal displacement has a obvious fluctuation in saturated condition. After saturated for 3 hours, the shear strength of the soil samples has a slight reduction. A certain condition of antecedent precipitation contributes a lot to the occurrence of debris flow. With the adequate antecedent precipitation, debris flow source region soil saturate rapidly, and shear strength has a significant drop that the soil is damaged by the action of gravity and erosion of runoff, taken away by surface water flow. As the rain continues, the shear strength of soil further reduces, and the risk of debris flow occurrence increases. Finally, debris flow startup with different types of solid source materials is comprehensive analyzed.

备注/Memo

备注/Memo:
收稿日期(Received date)：2013-05-16；改回日期(Accepted) : 2013-07-09。
基金项目（Foundation item）：河南省国土资源厅2011年度“两权价款”地质科研项目（2011-622-23）, 河南省科技厅科技攻关计划项目（122102310477）。[2011 Geological Sciences Item of Henan Land and Resources Departments “The Cost of Prospecting Rights and Mining Rights”（2011-622-23）；Scientific Brainstorm Project of He'nan Science and Technology Department（122102310477）.]
作者简介（Biography）：谢凯（1990-），男（汉族），湖北仙桃人，硕士研究生，研究方向地质工程。[Xie Kai(1990-), Male (Han Population), Born in Xiantao city，Hubei Province，master student, research direction :geological engineering.] Tel: 15007169937，E-mail：xiekaicug@126.com *通信作者（Corresponding author）：余宏明(1952-)，男，硕士，教授，博士生导师，主要从事地质灾害分析与防治及岩土工程领域的教学与科研工作。[Yu Hongming(1952-),male, master, professor, Ph D supervisor, mainly engaged in teaching and research work of geological disasters analysis and prevention and geotechnical engineering.] E-mail: yuhongming55@sohu.com
更新日期/Last Update: 1900-01-01