Oedometer expansion and direct shear tests on vetiver root-reinforced expansive soil with different water contents
ZHOU Cheng1, 2, LU Yong-zhen1, HUANG Yue-hua1
1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; 2. Key Lab of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources , Nanjing Hydraulic Research Institute, Nanjing 210024, China
Abstract:Oedometer expansion and direct shear tests are conducted on expansive soil with various initial water contents. Expansive force and shear strength of the samples with/without vetiver roots with different initial water contents are measured. The expensive force and shear strength with respect to reinforcement of vetiver roots are investigated. It is illustrated that vetiver root can increase shear strength and be used as flexible reinforcement to control expansive deformation and release expensive force of expansive soil with a degree of saturation under rainfall.
周成, 路永珍, 黄月华. 香根草加固不同含水率膨胀土的侧限膨胀和直剪试验[J]. 岩土工程学报, 2016, 38(z2): 30-35.
ZHOU Cheng, LU Yong-zhen, HUANG Yue-hua. Oedometer expansion and direct shear tests on vetiver root-reinforced expansive soil with different water contents. Chinese J. Geot. Eng., 2016, 38(z2): 30-35.
[1] GENS A, ALONSO E. A framework for the behavior of unsaturated expansive clays[J]. Canadian Geotechnical Journal. 1992, 29(6): 1013-1032. [2] CHO S E, LEE S R. Instability of unsaturated soil slopes due to infiltration[J]. Computers and Geotechnics, 2001, 28(3): 185-208. [3] SOROCHAN E A. Use of piles in expansive soils[J]. Soil Mechanics and Foundation Engineering, 1974, 11(l): 33-38. [4] MUZAHIM Al-Mukhtar, SUHAIL Khattab, ALCOVER Jean-Francois. Microstructure and geotechnical properties of lime-treated expansive clayey soil[J]. Engineering Geology, 2012, 39: 17-27. [5] COKCA E. Use of class C fly ashes for the stabilization of an expansive soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 27(7): 568-573. [6] 杨 俊, 黎新春, 张国栋, 等. 风化砂改良膨胀土机理及边坡稳定性分析[J]. 江苏大学学报(自然科学版), 2014, 35(5): 600-604. (YANG Jun, LI Xin-chun, ZHANG Guo-dong, et al. Improving mechanism of expansive soil by weathered sand and slope stability analysis[J]. Journal of Jiangsu University, 2014, 35(5): 600-604. (in Chinese)) [7] 肖 杰, 杨和平, 符 浩, 等. 膨胀土边坡加筋作用的对比模型试验[J]. 中国公路学报, 2014, 27(7): 24-31. (XIAO Jie, YANG He-ping, FU Hao, et al. Comparison model test on effect of geogrid reinforcement for expansive soil slope[J]. China Journal of Highway and Transport, 2014, 27(7): 24-31. (in Chinese)) [8] VISWANADHAM B V S, PHANIKUMAR B R, MUKHERJEE Rahul V. Swelling behavior of a geofiber-reinforced expansive soil[J]. Geotextiles and Geomembranes, 2009, 27(1):73-76. [9] LIU Si-hong, YANG Lu, WENG Li-ping, et al. Field study of treatment for expansive soil/rock channel slope with soilbags[J]. Geotextiles and Geomembranes, 2015, 43(4): 283-292. [10] WANG Liu-jiang, LIU Si-hong, ZHOU Bin. Experimental study on the inclusion of soilbags in retaining walls constructed in expansive soils[J]. Geotextiles and Gomembranes, 2015, 43(1): 89-96. [11] LIU Si-hong, BAI Fu-qing, WANG Yi-sen, et al. Treatment for expansive soil channel slope with soilbags[J]. Journal of Aerospace Engineering, 2013, 26(4): 657-666. [12] ROERING J J, SCHMIDT K M, STOCK J D, et al. Shallow landsliding, root rein-forcement, and the spatial distribution of trees in the Oregon Coast Range[J].Canadian Geotechnical Journal, 2003, 40(2): 237-253. [13] GRAY D H, SOTIR R. Biotechnical stabilization of highway cut slope[J]. Journal of Geotechnical Engineering, 1992, 118(9): 1395-1409. [14] WU T H, KOKESH C M, TRENNER B R. Use of live poles for stabilization of a shallow slope failure[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2014, 140(10): 1-13. [15] WU T H, WATSON A. In situ shear tests of soil blocks with roots[J]. Canadian Geotechnical Journal, 1998, 35(4): 579-590. [16] MICKOVSKI S B, BRANSBY M F, BENGOUGH A G, et al. Resistance of simple plant root systems to uplift loads[J]. Canadian Geotechnical Journal, 2010, 47(1): 78-95.