水位骤降环境土工织物加固土坡的离心模型试验

张嘎, 罗方悦, 刘扬, 王爱霞

清华大学学报(自然科学版) ›› 2017, Vol. 57 ›› Issue (7) : 728-731,737.

PDF(1619 KB)
PDF(1619 KB)
清华大学学报(自然科学版) ›› 2017, Vol. 57 ›› Issue (7) : 728-731,737. DOI: 10.16511/j.cnki.qhdxxb.2017.25.029
水利水电工程

水位骤降环境土工织物加固土坡的离心模型试验

  • 张嘎, 罗方悦, 刘扬, 王爱霞
作者信息 +

Centrifuge model test of geotextile-reinforced soil slopes during drawdown

  • ZHANG Ga, LUO Fangyue, LIU Yang, WANG Aixia
Author information +
文章历史 +

摘要

土工织物是土石坝堤和土坡的常用加固手段,其在水位骤降环境下对土坡的加固机理尚未阐明。该文进行了水位骤降离心模型试验,观测了土工织物加固土坡与素土坡的变形破坏过程。试验结果表明:土工织物显著减小了土坡的位移并提高了土坡稳定性;土工织物存在着与水位变化无关的分界点,其内侧和外侧分别表现为约束土坡变形和被土坡约束的不同性质;土工织物通过其与土坡的相互作用,将土坡内部的约束传递到坡外部,使土坡的变形分布更均匀,阻碍了“变形局部化发展到一定程度”这一滑裂面形成的前提条件的发生。

Abstract

Geotextiles are widely used to reinforce embankments and soil slopes. However, the geotextile reinforcement mechanism during drawdown is not well understood. Centrifuge model tests were conducted to observe the deformation and failure of geotextile-reinforced and unreinforced slopes during drawdown. The test shows that the geotextile significantly reduces the deformation and increases the slope stability. The slope deformation is restricted by the geotextile for water levels lower then a critical point and anchored by the geotextile at higher levels. The geotextile transmitted the interior restriction to the exterior of the slope via the soil-geotextile interaction. Thus, the deformation was more uniformly distributed. The geotextile delayed deformation localization, the precondition for slope failure.

关键词

土坡 / 水位骤降 / 土工织物 / 加固 / 离心模型试验

Key words

soil slope / drawdown / geotextile / reinforcement / centrifuge model test

引用本文

导出引用
张嘎, 罗方悦, 刘扬, 王爱霞. 水位骤降环境土工织物加固土坡的离心模型试验[J]. 清华大学学报(自然科学版). 2017, 57(7): 728-731,737 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.029
ZHANG Ga, LUO Fangyue, LIU Yang, WANG Aixia. Centrifuge model test of geotextile-reinforced soil slopes during drawdown[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(7): 728-731,737 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.029
中图分类号: TU42   

参考文献

[1] 廖红建, 盛谦, 高石夯, 等. 库水位下降对滑坡体稳定性的影响 [J]. 岩石力学与工程学报, 2005, 24(19):3454-3458.LIAO Hongjian, SHENG Qian, GAO Shihang, et al. Influence of drawdown of reservoir water level on landslide stability [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(19):3454-3458. (in Chinese) [2] Jian W X, Xu Q, Yang H F, et al. Mechanism and failure process of Qianjiangping landslide in the Three Gorges Reservoir, China [J]. Environmental Earth Sciences, 2014, 72(8): 2999-3013. [3] 杨春宝, 朱斌, 孔令刚, 等. 水位变化诱发粉土边坡失稳离心模型试验 [J]. 岩土工程学报, 2013, 35(7): 1261-1271.YANG Chunbao, ZHU Bin, KONG Linggang, et al. Centrifugal model tests on failure of silty slopes induced by change of water level [J]. Chinese Journal of Geotechnical Engineering, 2013, 35(7): 1261-1271. (in Chinese) [4] Jia G W, Zhan T L T, Chen Y M, et al. Performance of a large-scale slope model subjected to rising and lowering water levels [J]. Engineering Geology, 2009, 106(1-2): 92-103. [5] 唐晓松, 郑颖人, 唐辉明, 等. 水库滑坡变形特征和预测预报的数值研究 [J]. 岩土工程学报, 2013, 35(5): 940-947.TANG Xiaosong, ZHENG Yingren, TANG Huiming, et al. Numerical researches on deformation characteristics and prediction of reservoir landslides [J]. Chinese Journal of Geotechnical Engineering, 2013, 35(5): 940-947. (in Chinese) [6] Thusyanthan N I, Madabhushi S P G, Singh S. Tension in geomembranes on landfill slopes under static and earthquake loading-centrifuge study [J]. Geotextiles and Geomembranes, 2007, 25(2): 78-95. [7] Kelln C, Sharma J, Hughes D, et al. Deformation of a soft estuarine deposit under a geotextile reinforced embankment [J]. Canadian Geotechnical Journal, 2007, 44(5): 603-617. [8] Viswanadham B V S, Knig D. Centrifuge modeling of geotextile-reinforced slopes subjected to differential settlements [J]. Geotextiles and Geomembranes, 2009, 27(2): 77-88. [9] Zornberg J G, Sitar N, Mitchell J K. Performance of geosynthetic reinforced slopes at failure [J]. Journal Geotechnical and Geoenvironmental Engineering, 1998, 124(8): 670-683. [10] Wang L P, Zhang G, Zhang J M. Centrifuge model tests of geotextile-reinforced soil embankments during an earthquake [J]. Geotextiles and Geomembranes, 2011, 29(3): 222-232. [11] Luo F Y, Zhang G. Progressive failure behavior of cohesive soil slopes under water drawdown conditions [J]. Environmental Earth Sciences, 2016, 75(11): 973. [12] Zhang G, Hu Y, Zhang J M. New image analysis-based displacement-measurement system for geotechnical centrifuge modeling tests [J]. Measurement, 2009, 42(1): 87-96. [13] Zhang G, Wang L P. Integrated analysis of a coupled mechanism for the failure processes of pile-reinforced slopes [J]. Acta Geotechnica, 2016, 11(4): 941-952.

PDF(1619 KB)

Accesses

Citation

Detail

段落导航
相关文章

/