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[1]SONG Lu,ZHU Haili,LI Guorong,et al.Comparative Research for Two Experimental Methods to Determine Soil-Root Composite Shear Strength[J].Research of Soil and Water Conservation,2016,23(04):282-287.

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Comparative Research for Two Experimental Methods to Determine Soil-Root Composite Shear Strength

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 04 Page number: 282-287 Column: Public date: 2016-04-28

Title:: Comparative Research for Two Experimental Methods to Determine Soil-Root Composite Shear Strength

Author(s):: SONG Lu¹, ZHU Haili^1,2, LI Guorong¹, WANG Tao¹, CHEN Wenting¹; 1. Department of Geological Engineering, Qinghai University, Xi’ning 810016, China;
2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xi’ning 810008, China

Keywords:: In-situ vane shear test; direct shear test; shear strength; vegetation coveraye; water content

CLC:: TU411.7

DOI:: -

Abstract:: In order to determine the shear strength of soil-root composite more effectively and conveniently, and decrease the surface damage area, shear tests were carried out with different vegetation coverage and different water contents by using reformed in-situ vane shear apparatus and direct shear apparatus respectively on the campus of Qinghai University. The experimental results showed that the average cohesion of soil-root composites ranges from 20.39 kPa to 36.49 kPa under same water content by direct shear test, while the average shear strength of soil-root composites ranges from 35.92 kPa to 102.36 kPa through in-situ vane shear test. Then the average cohesion of soil-root composites ranges from 32.46 kPa to 23.32 kPa under same vegetation coverage by direct shear apparatus, while the average shear strength ranges from 109.7 kPa to 68.12 kPa by in-situ vane shear test. The results of two test methods both showed that the shear strength of soil-root composite increased with the increase of vegetation coverage, and decreased with increase of water content. The soil-root composite shear strength of in-situ vane shear test was higher than that of the direct shear test, the average increment reached to 94.23%. The main reasons for making differences between the two methods are due to various shear mode, shear failure area, the number of roots available to shear and damage degree. In situ vane shear test can reflect the change pattern more accurately and visually in the process of landslide because soil-root composites were destroyed completely and the soil structure and root distribution were not destroyed compared with the direct shear test.

References:: [1] 周德培,张俊云.植被护坡工程技术[M].北京:人民交通出版社,2003.
[2] 谭少华,汪益敏.高速公路边坡生态防护技术研究进展与思考[J].水土保持研究,2004,11(3):81-84.
[3] 孔东莲,郭小平,赵廷宁.植被护坡技术研究[J].水土保持研究,2007,14(1):69-71.
[4] 刘小燕.根系土的工程性状研究及其在生态边坡稳定分析中的应用[D].江西赣州:江西理工大学,2014.
[5] Niu J T, Liu Z Y, Jin C. Physical and numerical simulation of materials processing[M]. Switzerland:Trans Tech Publications Inc.,2008:1210-1216.
[6] 言志信,宋云,江平,等.植被护坡中植物根和岩土相互作用的力学分析[J].应用数学和力学,2010,31(5):585-590.
[7] 卢海静,王磊,翟国良,等.植物根-土复合体原位剪切试验研究现状及其进展[J].中国水土保持,2013(7):42-46.
[8] Frydman S, Operstein V. Numerical simulation of direct shear of root-reinforced soil[J]. Ground Improvement,2001,5(1):41-48.
[9] 周云艳,陈建平,王晓梅.植物须根固土护坡的复合材料理论研究[J].武汉理工大学学报,2010,32(18):103-107.
[10] 陈丽华,余新晓,宋维峰,等.林木根系固土力学机制[M].北京:科学出版社,2008.
[11] 格日乐,张成福,蒙仲举,等.3种植物根-土复合体抗剪特性对比分析[J].水土保持学报,2014,28(2):85-90.
[12] 程洪,颜传盛,李建庆,等.草本植物根系的固土机制模式与力学试验研究[J].水土保持研究,2006,13(1):62-65.
[13] 胡其志,周一鹏,肖本林,等.根土复合体的抗剪强度研究[J].湖北工业大学学报,2011,26(2):101-104.
[14] 刘艳丽,王全九,杨婷,等.植物叶片截留特征分析[J].水土保持研究,2015,22(4):143-154.
[15] 佘冬立,刘营营,邵明安,等.黄土坡面不同植被冠层降雨截留模型模拟效果及适用性评价[J].农业工程学报,2012,28(16):115-120.
[16] 余新晓.森林植被减弱降雨侵蚀能量的数理分析[J].水土保持学报,1988,2(2):24-30.
[17] 胡夏嵩,李国荣,朱海丽,等.寒旱环境灌木植物根-土相互作用及其护坡力学效应[J].岩土力学与工程学报,2009,28(3):613-620.
[18] Gray D H, Ohashi H. Mechanics of fiber reinforcement in sand[J]. Journal of Geotechnical Engineering,1983,109(3):335-353.
[19] 格日乐,左志严,蒙仲举,等.杨柴根系提高土体抗剪特性的研究[J].水土保持学报,2014,28(4):72-77.
[20] 陈昌富,刘怀星,李亚平.草根加筋土的室内三轴试验研究[J].岩土力学,2007,18(10):2041-2045.
[21] 冀晓东,陈丽华,张超波.林木根系对土壤的增强作用与机理分析[J].中国水土保持,2009(10):19-21.
[22] Wu T H, Beal P E, Lan C. In-situ shear test of soil-root systems[J]. Journal of Geotechnical Engineering,1988,114(12):1376-1394.
[23] 周云艳,陈建平,杨倩,等.植物根系固土护坡效应的原位测定[J].北京林业大学学报,2010,32(6):66-70.
[24] Micheli E R, Kirchner J W. Effects of wet meadow riparian vegetation on streambank erosion. 2. Measurements of vegetated bank strength and consequences for failure mechanics[J]. Earth Surface Processes and Landforms,2002,27(7):687-697.
[25] 陈昌富,刘怀星,李亚平.草根加筋土的护坡机理及强度准则试验研究[J].中南公路工程,2006,31(2):14-17.
[26] 赵惇廉.西宁市山地崩塌、滑坡灾害及其防治对策[J].青海环境,2004,4(1):29-31.
[27] 余芹芹,乔娜,卢海静,等.植物根系对土体加筋效应研究[J].岩石力学与工程学报,2012,31(Z1):3216-3223.
[28] 余芹芹,胡夏嵩,李国荣,等.寒旱环境灌木植物根-土复合体强度模型试验研究[J].岩石力学与工程学报,2013,32(5):1020-1031.
[29] 李国荣,胡夏嵩,毛小青,等.青藏高原东北部黄土区草本与灌木植物根-土相互作用力学机理及其模型研究[J].中国水土保持,2013(7):37-41.
[30] 张兴玲,胡夏嵩.青藏高原东北部黄土区草本植物根系加筋土的抗剪特性[J].水土保持通报,2013,33(4):185-188.
[31] 孟高头.土体原位测试机理、方法及其工程应用[M].北京:地质出版社,1997.

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