水对桃坪冰水堆积物抗剪强度的影响
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- 英文论文题名：The effects of water on shear strength of glaciofluvial deposits in Taoping Area
- 论文作者：祁昊 ; 冯文凯 ; 陈建峰 ; 郭小鹏 ; 叶敏
- 英文论文作者：QI Hao ; FENG Wenkai ; CHEN Jianfeng ; Department of Geotechnical Engineering ; Tongji University ; State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection ; Chengdu University of Technology ; Key laboratory of Geotechnical and Underground Engineering of Ministry of Education ; Tongji University
- 年：2017
- 作者机构：同济大学地下建筑与工程系;成都理工大学地质灾害防治与地质环境保护国家重点实验室;同济大学岩土及地下工程教育部重点实验室;
- 论文关键词：冰水堆积物 ; 含水率 ; 抗剪强度 ; 吸力 ; 微观结构
- 英文论文关键词：glaciofluvial deposits ; water content ; shear strength ; suction ; microstructure
- 会议召开时间：2017-04-18
- 会议录名称：2017年第九届边坡工程大会论文集
- 语种：中文
- 分类号：TU4
- 学会代码：ZJKC
- 会议名称：2017年第九届边坡工程大会
- 会议地点：中国浙江宁波
- 主办单位：中国建筑学会工程勘察分会
- 学会名称：中国建筑学会工程勘察分会
- 页数：7
- 文件大小：1019k
- 原文格式：D
- 会议级别：全国
摘要
为探究水对桃坪冰水堆积物抗剪强度的影响规律,取原状土样进行了6种不同含水率条件下的不固结不排水三轴剪切试验,并探讨了该类特殊土体强度变化的微观机理。含水率对桃坪冰水堆积物的抗剪强度有着显著的影响,其饱和时的黏聚力和内摩擦角比天然含水率情况分别降低40.0%和29.5%。冰水堆积物强度衰减机理包括吸力对抗剪强度强度贡献弱化,粘土矿物吸水膨胀,微观结构损伤,其主要表现为:土中吸力随含水率增大而迅速降低,其抑制土颗粒相对滑动的能力降低;浸水后,粘土矿物吸水膨胀,颗粒间孔隙增大,其微观形态由絮凝状变为层状或分散状。针对桃坪堆积体上广泛存在的浅层滑坡,应开展堆积区降雨量动态监测、优化改进灌溉方式以及加强坡体表部排水设施建设等工作。
In order to investigate the influence of water on shear strength of glaciofluvial deposits in Taoping area, unconsolidated undrained triaxial shear tests of original samples were conducted in six different water content conditions. And the microcosmic mechanism of the change of the strength of the special soil was discussed. Water content has a significant effect on the shear strength of the breccia soil in Taoping deposit. When it was saturated, the cohesion and internal friction angle were 40.0% and 29.5%lower than that in the case of natural water content. The micro-mechanism of strength's attenuation can be summarized as the weakening contribution of suction to shear strength, the swelling of clay minerals and the damage of microstructure, which's mean performances are as follow. First, the suction in the soil decreases rapidly with the increase of water content, which causes the ability to suppress the relative sliding of soil particles is reduced. Then, the clay minerals swell after absorbing water, causing its intergranular pores to increase and its form turns from flocculent to layered or dispersed. Aiming at the shallow landslides which are widespread on the slope, it is necessary to carry out dynamic monitoring of rainfall in the accumulation area, to optimize the irrigation method and to strengthen the construction of the drainage system.
In order to investigate the influence of water on shear strength of glaciofluvial deposits in Taoping area, unconsolidated undrained triaxial shear tests of original samples were conducted in six different water content conditions. And the microcosmic mechanism of the change of the strength of the special soil was discussed. Water content has a significant effect on the shear strength of the breccia soil in Taoping deposit. When it was saturated, the cohesion and internal friction angle were 40.0% and 29.5%lower than that in the case of natural water content. The micro-mechanism of strength's attenuation can be summarized as the weakening contribution of suction to shear strength, the swelling of clay minerals and the damage of microstructure, which's mean performances are as follow. First, the suction in the soil decreases rapidly with the increase of water content, which causes the ability to suppress the relative sliding of soil particles is reduced. Then, the clay minerals swell after absorbing water, causing its intergranular pores to increase and its form turns from flocculent to layered or dispersed. Aiming at the shallow landslides which are widespread on the slope, it is necessary to carry out dynamic monitoring of rainfall in the accumulation area, to optimize the irrigation method and to strengthen the construction of the drainage system.
引文
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[2].王献礼.西南山区冰水堆积物的工程地质特性及灾害效应研究[D].北京:中国地质科学院,2009.Wang Xian-li.Engineering Geological Properties and Relevant Geohazards of Glacial Deposits from Southwest Mountains of China[M].Beijing:Chinese Academy of Geological Sciences,2009.(in Chinese)
[3].Clague John J,Evans Stephen G.Geologic Framework of Large Historic Landslides in Thompson River Valley,British Columbia.Environmental&Engineering Geoscience August,2003,Volume 9,Issues 3,Pages 201-212.
[4].Springman S M,Jommi C,Teysseire P.Instabilities on moraine slopes induced by loss of suction[J].Geotechnique,2003,53(1):3-10.
[5].张永双,曲永新,王献礼,等.中国西南山区第四纪冰川堆积物工程地质分类探讨[J].工程地质学报,2009,17(5):581-589.Zhang Yong-shuang,Qu Yong-xin,Wang Xian-li,et al.On the engineering geological classification of quaternary Glacial deposits in southwestern mountain area of China[J].Journal of Engineering Geology,2009,17(5):581-589.(in Chinese)
[6].涂国祥,黄润秋,邓辉,等.某巨型冰水堆积体强度特性大型常规三轴试验[J].山地学报,2010,28(2):147-153.Tu Guo-xiang,Huang Run-qiu,Deng Hui.Discussion about the evolution and the geoengineering problems of an outwash deposits,Lantsang[J].Journal Of Mountain Science,2009,27(1):54-62.(in Chinese)
[7].刘云鹏,黄润秋,邓辉.库岸再造对雅泸高速公路岗子上隧道进口岸坡的影响[J].工程地质学报,2011,19(3):417-427.Liu Yun-peng,Huang Run-qiu,Deng Hui.Influence of reservoir bank reconstruction on portal bank slope of Gangzishang tunnel in Yahu Expressway[J].Journal of Engineering Geology,2011,19(3):417-427.(in Chinese)
[8].冯俊德,李建国,汪稔,等.云南某铁路冰碛土大型直剪强度特性试验研究[J].岩土力学,2008,29(12):3205-3210.Feng Jun-de,Li Jian-guo,WANG Ren,et al.Large scale direct shear test on strength behavior of railway moraine soils in Yunnan[J].Rock and Soil Mechanics,2008,29(12):3205-3210.(in Chinese)
[9].杨帆.欢喜坡大型堆积体工程地质特征及稳定性研究[D].成都:成都理工大学,2012.Yang Fan.Research on Characteristics of the engineering geological and stability of Huanxi-po giant glacial till[D].Chengdu:Chengdu University of Technology,2012.(in Chinese)
[10].黄家华.四川理县桃坪冰水堆积体强度特性研究[D].成都:成都理工大学,2016.Huang Jia-hua.Study on strength characteristics of Taoping outwash deposit in Li County,Sichuan Province[D].Chengdu:Chengdu University of Technology,2016.(in Chinese)
[11].刘顺青,洪宝宁,朱俊杰,等.粉状和砾状煤系土的水敏感性及边坡稳定性分析[J].科学技术与工程,2016,16(8):0143-0150.Liu Shun-qing,Hong Bao-ning,Zhu Jun-jie,et al.Study on the Water Sensitivity of Powered and Rudaceous Soil of Coal Measure Strata and Slope Stability Analysis[J].Science Technology and Engineering,2016,16(8):0143-0150.(in Chinese)
[12].曾琳洁.基于SWCC的小岐村冰碛堆积体斜坡强度及稳定性研究[D].成都:成都理工大学,2014.Zeng Lin-jie.Intensity And stability Study of the Xiao Qi Village Glacial Till Slope Based on SWCC[D].Chengdu:Chengdu University of Technology,2014.(in Chinese)
[13].李骅锦,冯文凯,许强,等.四川理县小歧村冰碛物角砾土抗剪强度特性研究[J].人民长江,2015,46(12):37-41.Li Hua-jin,Feng Wen-kai,Xu Qiang,et al.Study on shear strength properties of moraine breccia soil at Xiaoqi Village of Lixian County[J].Yangtze River,2015,46(12):37-41.(in Chinese)
[14].刘艳华,龚壁卫,苏鸿.非饱和土的水土特征曲线研究[J].工程勘察,2002,(3):8-11.Liu Yan-hua,Gong Bi-wei,Su Hong.Study on soil water characteristic curve of unsaturated soil[J].Geotechnical Investigation&Surveying,2002,(3):8-11.(in Chinese)
[15].孟长江.非饱和土土水特征曲线与强度的试验研究及其应用[D].大连:大连理工大学,2006.Meng Chang-jiang.Test study on the soil water characteristic curve and strength of unsaturated soils and application[D].Dalian:Dalian University of Technology,2014.(in Chinese)
[16].迟广成,肖刚,伍月,等.X射线粉晶衍仪在大理岩鉴定与分类中的应用[J].岩矿测试,2014,05:698-705.Chi Guang-cheng,Xiao Gang,Wu Yue,et al.The application of X-ray powder diffraction to marble definition and classification[J].Rock and Mineral Analysis,2014,05:698-705.(in Chinese)
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