1. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, CTGU, Yichang 443002, China; 2. Collaborative Innovation Center for Geo-hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China; 3. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China; 4. Guiyang Engineering Corporation Limitied of Powerchina, Guiyang 550081, China
Abstract:The shear characteristics of base material soil-rock interface are studied by means of in-situ shear tests by using the homemade shear apparatus under various interfacial roughnesses and root densities of Indigofera amblyantha. The test results reveal that the shear stress-displacement of the base material soil-rock interface is characterized by typical shear softening. Under the reinforced effect of roots on base material soil and its anchorage effect on soil-rock interface in the tests, the rooted samples exhibit rough fractured shear failure plane. The contribution of roots to improving the interfacial peak shear strength, peak shear displacement and residual shear strength is significant. According to the comparison, it is found that the contribution differences are small for the same root area ratio (RAR) to improving the intrfacial peak shear strength under different roughnesses. For a small RAR, the contribution ratio of roots is lower than that of interfacial roughness. As RAR increases, however, the effect of roots on improving the interfacial peak shear strength is more obvious, the contribution ratio of roots thus increases significantly.
丁瑜, 夏振尧, 许文年, 杨奇. 根系作用下的基材土-岩接触面原位剪切试验研究[J]. 岩土工程学报, 2016, 38(11): 2107-2113.
DING Yu, XIA Zhen-yao, XU Wen-nian, YANG Qi. In-situ shear tests on base material soil-rock interface interacted by roots. Chinese J. Geot. Eng., 2016, 38(11): 2107-2113.
[1] 张俊云, 周德培, 李绍才. 岩石边坡生态护坡研究简介[J]. 水土保持通报, 2000, 20(4): 36~38. (ZHANG Jun-yun, ZHOU De-pei, LI Shao-cai. Brief introduction of study on slope eco-engineering for rock slope protection[J]. Bulletin of Soil and Water Conservation, 2000, 20(4): 36-38. (in Chinese)) [2] 许文年, 叶建军, 周明涛, 等. 植被混凝土护坡绿化技术若干问题探讨[J]. 水利水电技, 2004, 35(10): 50-51. (XU Wen-nian, YE Jian-jun, ZHOU Ming-tao, et al. Several problems of vegetation for protecting slope using vegetation-growing concrete[J]. Water Resources and Hydropower Engineering, 2004, 35(10): 50-51. (in Chinese)) [3] 刘黎明, 邱卫民, 许文年, 等. 传统护坡与生态护坡比较与分析[J]. 三峡大学学报(自然科学版), 2007, 29(6): 528-532. (LIU Li-ming, QIU Wei-min, XU Wen-nian, et al. Discussion on tranditional slope protection and ecological slope protection technology[J]. Journal of China Three Gorges University (Natural Sciences), 2007, 29(6): 528-532. (in Chinese)) [4] 王晓梅, 陈建平, 董道军. 喷射厚层基材植被护坡效果分析[J]. 湖北农业科学, 2009, 48(4): 891-893. (WANG Xiao-mei, CHEN Jian-ping, DONG Dao-jun. Analysis of effects on vegetation slope protection technology of thick layer backing[J]. Hubei Agricultural Science, 2009, 48(4): 891-893. (in Chinese)) [5] 夏振尧, 许文年, 王乐华. 植被混凝土生态护坡基材初期强度特性研究[J]. 岩土力学, 2011, 32(6): 1719-1724. (XIA Zhen-yao, XU Wen-nian, WANG Le-hua. Research on characteristics of early strength of ecological slope-protected base material of vegetation-growing concrete[J]. Rock and Soil Mechanics, 2011, 32(6): 1719-1724. (in Chinese)) [6] 蔡显杨. 植被混凝土基材与岩体接触面力学特性试验研究[D]. 宜昌: 三峡大学, 2012. (CAI Xian-yang. Experimental staudy on Mechanical characteristics of interface of vegetation-growing concrete base material & rock mass[D]. Yichang: China Three Gorges University, 2012. (in Chinese)) [7] 胡黎明, 濮家骝. 土与结构物接触面物理力学特性试验研究[J]. 岩土工程学报, 2001, 23(4): 431-435. (HU Li-ming, PU Jia-liu. Experimental study on mechnical characteristics of soil-structure interface[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(4): 431-435. (in Chinese)) [8] 陆桂红, 杨 顺, 王 钧, 等. 植物根系固土力学机理非的研究进展[J]. 南京林业大学学报(自然科学版), 2014, 38(2): 156-161. (LU Gui-hong, YANG Shun, WANG Jun, et al. The mechanism of plant roots reinforcement on soil[J]. Journal of Nanjing Forestry University (Natural Sciences Edition), 2014, 38(2): 156-161. (in Chinese)) [9] SCHMIDT K M, ROERING J J, STOCK J D, et al. Root cohesion varibility and shallow landslide susceptibbility in the Oregen Coast Range[J]. Canadian Geotechnical Journal, 2001, 38: 995-1024. [10] SCIPPA G S, DI MICHELE M, DI IORIO A, et al. The response of spartium juuceum roots to slope: anchorage and gene factors[J]. Annals of Botany, 2006, 97: 857-866. [11] 李绍才, 孙海龙, 杨志荣, 等. 坡面岩体-基质-根系互作的力学特性[J]. 岩石力学与工程学报, 2005, 24(12): 2074-2081. (LI Shao-cai, SUN Hai-long, YANG Zhi-rong, et al. Interactional mechanical characteristics of rock-substrate-root system[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(12): 2074-2081. (in Chinese)) [12] 赵丽兵, 张宝贵, 苏志珠. 草本植物根系增强土壤抗剪切强度的量化研究[J]. 中国生态农业学报, 2008, 16(3): 718-722. (ZHAO Li-bing, ZHANG Bao-gui, SU Zhi-zhu. Quantitative analysis of soil anti-shearing strength enhancement by the root systems of herb plants[J]. Chinese Journal of Eco-agriculture, 2008, 16(3): 718-722. (in Chinese)) [13] 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]. 岩石力学与工程学报, 2009, 28(3): 614-620. (HU Xia-song, LI Guo-rong, ZHU Hai-li, et al. Research on interaction between vegetation root and soil for slope protection and its mechanical effect in cold and arid environments[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(3): 614-620. (in Chinese)) [14] 丁 瑜, 杨 奇, 夏振尧, 等. 生态护坡基材土-岩接触面原位剪切试验研究[J]. 岩土力学, 2015, 36(增刊2): 383-388. (DING Yu, YANG Qi, XIA Zhen-yao, et al. Experimental study of base material soil-rock interface in ecological slope protection by in-situ shear test[J]. Rock and Soil Mechanics, 2015, 36(S2): 383-388. (in Chinese))