基于影响带观测的加筋土坡稳定性分析

胡幼常; 靳少卫; 宋亮; 毛爱民; 刘杰

doi:10.11779/CJGE201702005

基于影响带观测的加筋土坡稳定性分析 English Version

1. 武汉理工大学交通学院,湖北武汉 430063;
2. 新疆维吾尔自治区交通规划勘察设计研究院,新疆乌鲁木齐 830006

详细信息

作者简介:
胡幼常（1961- ）,男,博士,副教授,主要从事岩土工程方面的教学和研究工作。E-mail: huyouchang@163.com。

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出版历程
- 发布日期: 2017-03-24

Stability analysis of reinforced soil slopes based on observation of reinforcement-effected strip

1. School of Transportation, Wuhan University of Technology, Wuhan 430063, China;
2 Xinjiang Transportation Planning Survey and Design Institute, Urumqi 830006, China

摘要

摘要: 为了观测土工格栅加筋影响带的范围,采用特制的一侧透明的拉拔盒,共对6种不同级配的粗粒土分别完成了4种法向压力下的拉拔试验。通过预埋于土中用大头针尖制作并包裹于导线皮中的位移观测点,直接观测了土工格栅在粗粒土中拉拔引起的土粒位移,发现格栅的拉拔会带动其上一定厚度范围内的土体发生移动,这个范围称之为加筋影响带。试验发现平均粒径d₅₀>0.83 mm的粗粒土中,土工格栅加筋影响带的厚度δ与试样的法向压力没有关联,主要与土粒级配有关,当d₅₀<1.05 mm时,δ随d₅₀的增大有较显著的增加;而当d₅₀>1.05 mm后,这种趋势明显减缓;特别是当d₅₀>1.65 mm后,二者呈良好的线性递增关系。基于这一试验结果,提出了考虑加筋影响带的加筋土坡稳定性分析方法,简称影响带法。在这一方法中,认为土工格栅的加筋作用相当于增加了加筋影响带内土的黏聚力,而内摩擦角不变。从而将加筋土坡简化为成层土坡,使计算大为简化。而计算得到的加筋土坡稳定安全系数在加筋层距不大于0.6 m,且格栅抗拉强度大于20 kN/m时,与有限元强度折减法的计算结果符合良好。
- 加筋影响带 /
- 土工格栅 /
- 拉拔试验 /
- 位移观测 /
- 加筋土坡 /
- 稳定性分析
Abstract: In order to observe the effected strip of geogrid-reinforcement, a series of geogrid pull-out tests are conducted in a test box which has one Plexiglas wall, applied 4 different vertical pressures on each specimen prepared respectively with 6 granular soils, with each having a different particle gradation. Through the Plexiglas wall, the displacements of the soil particles are observed with the help of the embedded marks which are the pinpoints wrapped by rubber wire coat. The displacements are found of the soil particles in the region from the top surface of the geogrid up to a certain height in the soil mass. This region is herein referred to as the reinforcement-effected strip. It is demonstrated that δ, the depth of the geogrid-effected strip, is related to the particle gradation rather than to the vertical pressure loaded on the specimen while d₅₀, the average diameter of soil particles, is greater than 0.83 mm. As d₅₀ gets larger, δ increases rapidly when d₅₀ is less than 1.05 mm and increases slowly when d₅₀ is greater than 1.05 mm. Especially, while d₅₀ is greater than 1.65 mm, δ has a good linear increasing relationship with d₅₀. Based on the test results, a method considering the reinforcement-effected strip, RESM for short here, is suggested to analyze the stability of a reinforced soil slope, in which the function of a geogrid reinforcement is assumed just only to increase the cohesion of the soil within the reinforcement-effected strip. Therefore, a reinforced soil slope is regarded as a layered soil slope in RESM, leading to a more simple stability analysis of a reinforced soil slope. The safety factors calculated by RESM are approximately equal to those by the strength reduction method while the reinforcement spacing is not greater than 0.6 m and the geogrid tensile strength is greater than 20 kN/m.
- reinforcement-effected strip /
- geogrid /
- pull-out test /
- displacement observation /
- reinforced soil slope /
- stability analysis

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参考文献(16)

[1]	JTG/T D32—2012 公路土工合成材料应用技术规范[S]. 2012. (JTG/T D32—2012 Technical specifications for application of geosynthetics in highway[S]. 2012. (in Chinese))
[2]	GB/T 50290—2014 土工合成材料应用技术规范[S]. 2014. (GB/T 50290—2014 Technical code for application of geosynthetics[S]. 2014. (in Chinese))
[3]	介玉新, 李广信. 有限元法在加筋土结构设计中应用的必要性和可行性[J]. 长江科学院院报, 2014, 31(3): 34-38. (JIE Yu-xin, LI Gung-xin. Necessity and feasibility of FEM in the design of reinforced soil structure[J]. Journal of Yangtze River Scientific Research Institute, 2014, 31(3): 34-38. (in Chinese))
[4]	郑颖人, 赵尚毅, 李安洪, 等. 有限元极限分析法及其在边坡工程中的应用[M]. 北京: 人民交通出版社, 2011: 11-12, 16. (ZHENG Ying-ren, ZHAO Shang-yi, LI An-hong, et al. FEM limit analysis and its application in slope engineering[M]. Beijing: China Communications Press, 2011: 11-12, 16. (in Chinese))
[5]	包承纲. 土工合成材料界面特性的研究和试验验证[J]. 岩石力学与工程学报, 2006, 25(9): 1735-1744. (BAO Cheng-gang. Study on interface behavior of geosynthetics and soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(9): 1735-1744. (in Chinese))
[6]	丁金华, 包承纲, 丁红顺. 土工格栅与膨胀岩界面相互作用的拉拔试验研究[C]// 第2届全国岩土与工程学术大会论文集. 北京: 科学出版社, 2006: 442-449. (DING Jin-hua, BAO Cheng-gang, DING Hong-shun. Pull-out test study on the interaction between geogrid and swelling rock[C]// Proceedings of the 2nd Chinese Conference on Geotechnical Engineering. Beijing: China Science Press, 2006: 442-449. (in Chinese))
[7]	张嘎, 张建民. 粗粒土与结构接触面单调力学特性的试验研究[J]. 岩土工程学报, 2004, 26(1): 21-25. (ZHANG Ga, ZHANG Jian-min. Experimental study on monotonic behavior of interface between soil and structure[J]. Chinese Journal of Geotechnical Engineering, 2004, 26(1): 21-25. (in Chinese))
[8]	张嘎, 张建民. 土与土工织物接触面力学特性的试验研究[J]. 岩土力学, 2006, 27(1): 51-55. (ZHANG Ga, ZHANG Jian-min. Experimental study on behavior of interface between soil and geotextile[J]. Rock and Soil Mechanics, 2006, 27(1): 51-55. (in Chinese))
[9]	陈建峰, 李辉利, 柳军修, 等. 土工格栅与砂土的细观界面特性研究[J]. 岩土力学, 2011, 32(增刊1): 66-71. (CHEN Jian-feng, LI Hui-li, LIU Jun-xiu, et al. Mesoscopic study of interface properties of geogrid-reinforced soil[J]. Rock and Soil Mechanics, 2011, 32(S1): 66-71. (in Chinese))
[10]	张嘎. 粗粒土与结构接触面静动力学特性及弹塑性损伤理论研究[D]. 北京: 清华大学, 2002. (ZHANG Ga. Static and dynamic behaviors for intact face between granular soil and structure[D]. Beijing: Tsinghua University, 2002. (in Chinese))
[11]	包承纲. 土工合成材料应用原理与工程实践[M]. 北京：中国水利水电出版社,2008: 191-193. (BAO Cheng-gang. The principle and application of geosynthetics in engineering[M]. Beijing: China Water & Power Press, 2008: 191-193. (in Chinese))
[12]	李广信. 高等土力学[M]. 清华大学出版社,2004: 326-341. (LI Gang-xin. Advanced soil mechanics[M]. Beijing: Tsinghua University Press, 2004: 326-341. (in Chinese))
[13]	李广信. 岩土工程50讲——岩坛漫话[M]. 2版. 北京: 人民交通出版社, 2010: 93-95. (LI Gang-xin. 50 lectures on geotechnical engineering—Informal discussions in the geotechnical circles[M]. 2nd ed. Beijing: China Communications Press, 2010: 93-95. (in Chinese))
[14]	介玉新, 秦晓艳, 金鑫, 等. 加筋高边坡的稳定分析[J]. 岩土工程学报, 2012, 34(4): 660-666. (JIE Yu-xin, QIN Xiao-yan, JIN Xin, et al. Stability of high reinforced soil slopes[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(4): 660-666. (in Chinese))
[15]	YANG Z. Strength and deformation characteristic of reinforced sand[D]. Calif: University of California, 1972.
[16]	唐善祥, 杜亮, 刘力, 等. 加筋土挡墙工程图集[M]. 2版. 北京: 人民交通出版社, 2015. (TANG Shan-xiang, DU Liang, LIU Li, et al. Drawings of reinforced soil retaining walls[M]. 2nd ed. Beijing: China Communications Press, 2015. (in Chinese))

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