含植被坡体稳定性的年际变化规律研究

doi:10.16843/j.sswc.2017.02.003

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (972 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract [Background] Effects of vegetation on slope stability are mainly embodied in two ways: a) the stress of weight and wind load caused by plants; b) the effects of plant roots reinforcement. The effects of plant species and growth stages on soil may change with time, which are difficult to measure and quantify due to existing technology. This paper aims to build a evaluation model that considers the plant growth and evaluates the safety factors of the slope under different layouts with different types of plants. [Methods] A growth model of individual-plant was used to obtain the inter-annual variation characteristics of plants. Meanwhile, height, DBH, canopy and number of root properties such as root quantity, branching patterns, and root inclinations were measured and discussed. Weight, wind load, and root reinforcement were also calculated in this paper. Finally, a modified equation was used to calculate the factors of safety of different vegetated slopes. [Results] Results showed that weight, wind load, and plants roots resulted in large impacts on slope stability. Slopes with Platycladus orientalis (L.) Franco, Vitex negundo var. heterophylla might enhance 46.8% and 54.9% compared to bare slope, reaching to the top 1.549 and 1.817 from the 30^th year to 50^th year respectively. After that, the safety factors of vegetated slopes tended to stabilize during the later growth. The effect of weight and wind load weakened slope stability. The influence of weight decreased safety factors about 0.1% and 0.7%, and the roots had decreased safety factors about 5.9% and 5.8%. [Conclusions] Based on the results, this paper concludes that the weight of plants and wind load may reduce safety factors, but root presents positive effect on slope stability. With the changes of years, effects of plant weight on slope stability mainly remain unchanged in the whole growth period. However, effects of root and wind load may increase during the early growth stage and then remain unchanged during the later stage. When evaluating vegetated slope stability, effects of plant weight, roots and wind load cannot be ignored or the safety factor may be overestimated or underestimated. In addition, the results provide reference to a reasonable layout in protecting slope and may be conducive to the ecological engineering construction.

Key words： slope stability evaluation model root reinforcement safety factors

Received: 10 November 2016

PACS:

S157.1

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	DING Xuekun
	ZHANG Shouhong
	WANG Yujie
	WANG Yunqi
	LI Yunpeng

Cite this article:

DING Xuekun,ZHANG Shouhong,WANG Yujie, et al. On the inter-annual variability of vegetated slope stability[J]. SSWC, 2017, 15(2): 18-24.

URL:

http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.02.003 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I2/18

[1]	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,2008:15. CHEN Lihua, YU Xinxiao, SONG Weifeng, et al. Root reinforcement of soil [M]. Beijing: Science Press, 2008:15.
[2]	张超波, 蒋静, 陈丽华. 植物根系固土力学机制模型[J]. 中国农学通报,2012,31:1. ZHANG Chaobo, JIANG Jing, CHEN Lihua. Review on the models of mechanical mechanism of soil reinforcement by plant roots [J]. Chinese Agricultural Science Bulletin, 2012, 31:1.
[3]	周云艳, 陈建平, 王晓梅. 植物根系固土护坡机理的研究进展及展望[J]. 生态环境学报, 2012, 21(6): 1171. ZHOU Yunyan, CHEN Jianping, WANG Xiaomei. Progress of study on soil reinforcement mechanisms by root and its expectation [J]. Ecology and Environmental Sciences, 2012, 21(6):1171.
[4]	周云艳. 植物根系固土机理与护坡技术研究[D].中国地质大学,2010:40. ZHOU Yunyan. Study on mechanism of soil reinforcement by roots and slope protection technology [D]. China University of Geosciences, 2010:40.
[5]	STOFFELS A, VAN S J. The main problems in sample plots [J]. Ned Boschb Tijdschr, 1953, 25: 190.
[6]	BROWN C B, SHEU M S. Effects of deforestation of slopes [J]. Journal of the Soil Mechanics and Foundations Division, 1975, 101(2): 147.
[7]	ANSELIN L. Exploring spatial data with GeoDaTM: a workbook [J]. Urbana, 2004, 51: 61801.
[8]	HSI G, NATH J H. Wind drag within simulated forest canopies [J]. Journal of Applied Meteorology, 1970, 9(4): 592.
[9]	COUTTS M P. Root architecture and tree stability [J]. Plant and soil, 1983, 71(1/2/3): 171.
[10]	COUTTS M P, NIELSEN C C N, NICOLL B C. The development of symmetry, rigidity and anchorage in the structural root system of conifers [J]. Plant and Soil, 1999, 217(1/2): 1.
[11]	KHUDER H, STOKES A, DANJON F, et al. Is it possible to manipulate root anchorage in young trees? [J]. Plant and Soil, 2007, 294(1/2): 87.
[12]	GRAY D H, BARKER D. Root-soil mechanics and interactions [J]. Riparian Vegetation and Fluvial Geomorphology, 2004: 113.
[13]	ODEN J T, RIPPERGER E A. Mechanics of elastic structures [M]. Hemisphere Pub. Corp., 1981.
[14]	WALDRON L J. The shear resistance of root-permeated homogeneous and stratified soil [J]. Soil Science Society of America Journal, 1977, 41(5): 843.
[15]	WRIGHT S G, DUNCAN J M. Soil strength and slope stability [M]. John Wiley & Sons, 2005.
[16]	BISHOP A W. The use of the slip circle in the stability analysis of slopes [J]. Geotechnique, 1955, 5(1): 7.
[17]	GREENWOOD J R. SLIP4EX–A program for routine slope stability analysis to include the effects of vegetation, reinforcement and hydrological changes [J]. Geotechnical & Geological Engineering, 2006, 24(3): 449.
[18]	GREENWOOD J R. Design approach for slope repairs and embankment widening [C]. Reinforced Embankments Symposium. 1989: 51.
[19]	陈英, 杨华, 李伟, 等. 北京地区侧柏人工林标准木生长过程研究[J]. 西北林学院学报, 2012, 27(5): 153. CHEN Ying, YANG Hua, LI Wei, et al. Standard tree growth of Platycluadus orientalis plantation in Beijing [J]. Journal of Northwest Forestry University, 2012, 27(5): 153.
[20]	陈英. 北京山区侧柏人工林生长模型及合理密度研究[D]. 北京林业大学, 2013:31. CHEN Ying. Research on growth model and stand reasonable density of Platycladus orientalis plantation in Beijing mountain area [D]. Beijing Forestry University, 2013:31.
[21]	张春霞. 水土保持灌木——荆条的生物生态学特性初步研究[D]. 北京林业大学, 2007:32. ZHANG Chunxia. Study on bioecological characteristics of soil and water conservation shurb-Vitex negundo [D]. Beijing Forestry University, 2007:32.
[22]	包昱峰, 高甲荣, 何明月, 等. 密云水库集水区荆条灌丛年龄结构研究[J]. 林业资源管理, 2008(6): 67. BAO Yufeng, GAO Jiarong, HE Mingyue, et al. Study on age structure of Vitex negundo community in Miyun reservoir watershed [J]. Forest Resources Management, 2008(6): 67.