用有限元法研究降雨对青海云杉林边坡稳定性的影响

doi:10.16843/j.sswc.2019.06.002

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摘要为研究降雨强度和降雨历时对贺兰山青海云杉林边坡稳定性的影响，通过三轴压缩、饱和渗透等土工试验获取青海云杉林边坡根土复合体的土力学参数，在此基础上建立基于有限元的贺兰山青海云杉林边坡稳定性计算模型。利用该模型分析了青海云杉林边坡与无林边坡（对照）的安全系数和破坏时间随降雨强度、降雨历时、边坡坡度的变化规律，拟合了降雨强度与边坡破坏时间的回归模型。通过降雨条件下青海云杉林边坡和无林边坡破坏时的最大位移、最大塑性应变的分析，量化了贺兰山青海云杉林增强降雨边坡稳定性的程度。研究结果表明：贺兰山青海云杉林与无林边坡的安全系数随降雨历时、降雨强度、边坡坡度的增加而减小。降雨条件下，青海云杉林边坡的破坏时间要显著高于无林边坡（平均高出48.61%），降雨强度与破坏时间的回归关系满足幂函数；青海云杉林的固土护坡作用随降雨强度的增加（从10 mm/h增加到25 mm/h）而减弱（从53.20%降低到45.70%），青海云杉林可以明显提高边坡破坏时的最大位移（提高224.42%）和最大塑性应变（提高95.28%）。综上，青海云杉林显著增强了降雨边坡的稳定性。

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	田佳
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	董亚宁

关键词 ：有限元法, 降雨强度, 边坡稳定, 根土复合体, 数值分析, 贺兰山

Abstract：[Background] Helan Mountain is an ecological barrier and water conservation area of Yinchuan Plain, and it is also a serious area of soil and water loss. The geological disasters, such as debris flow and shallow landslide caused by strong rain intensity, have caused huge economic, cultural and ecological losses in this area. Therefore, the study of slope stability under extreme weather is of great significance to the economic and social development in Helan Mountainous area.[Methods] In order to study the effect of rainfall intensity and duration on the slope stability of Picea crassifolia forest in Helan Mountain, the geomechanical parameters of the root-soil composite of P. crassifolia were obtained by triaxial compression, saturated infiltration and other geotechnical tests. On this basis, the stability calculation model of P. crassifolia forest slope in Helan Mountain was established based on finite element theory and software (ABAQUS). The finite element model for stability calculation of P. crassifolia forest slope was used to calculate the variation of safety factor (F_s) and the duration at failures (t_f) with the rainfall duration under different rainfall intensity (i=10-25 mm/h), and the intensity and duration at failures regression (ID) was fitted. Based on the analysis of maximum displacement (U_max) and maximum plastic strain (PEMAG_max) during the slopes without and with trees failure induced by the rainfall, the degree of slope stability improvement by the root-soil composite of P. crassifolia forest in Helan Mountain was quantified.[Results] 1) The safety factors of the slopes without and with trees decreased with the increase of rainfall duration, rainfall intensity and slope grade. The duration at failures of P. crassifolia forest slope under rainfall was significantly longer than that of the slope without trees (the average increase was 48.61%), and the regression relation between rainfall intensity and duration at failures satisfied the power function (The ID regression model:i=262.4t_f^-0.998, R²=0.999 6 (slope without trees); i=328.7t_f^-0.945, R²=0.999 (slope with trees)). 2) Under rainfall conditions, because of the effect of vegetation, the growth rate of duration at failures were 53.20% (i=10 mm/h), 50.57% (i=15 mm/h), 44.96% (i=20 mm/h) and 45.70% (i=25 mm/h) respectively and the average was 48.61%, however, the effect of root reinforcement on the slope decreased from 53.20% to 45.70%. The P. crassifolia forest obviously increased the maximum displacement U_max (224.42±80.29)% and the maximum plastic strain PEMAG_max(95.28±33.74)% when the slope failed.[Conclusions] The ID regression model, the maximum displacement and the maximum plastic strain of slopes without and with trees are obtained under rainfall, which prove that the P. crassifolia forest in Helan Mountain significantly enhances the slope stability.

Key words： finite element method rainfall intensity stability of slope root-soil composite numerical analysis Helan Mountain

收稿日期: 2018-10-23

PACS:

S157.2

基金资助:国家自然科学基金“贺兰山水土保持功能乔木根系锚固土壤作用与数值模拟研究”（31560232），“宁夏河东沙地典型防护林树种水分来源及水分利用策略研究”（31760236）

作者简介: 田佳(1982-),男,博士,副教授。主要研究方向:水土保持。E-mail:yuhudie63@qq.com

引用本文:

田佳, 韩磊, 金学娟, 许玲玲, 王晓燕, 董亚宁. 用有限元法研究降雨对青海云杉林边坡稳定性的影响[J]. 中国水土保持科学, 2019, 17(6): 11-18.
TIAN Jia, HAN Lei, JIN Xuejuan, XU Lingling, WANG Xiaoyan, DONG Yaning. Effect of rainfall on slope stability of Picea crassifolia forest based on finite element method in Qinghai. SSWC, 2019, 17(6): 11-18.

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http://journal12.magtechjournal.com/Jweb_stbc/CN/10.16843/j.sswc.2019.06.002 或 http://journal12.magtechjournal.com/Jweb_stbc/CN/Y2019/V17/I6/11

[1]	宁贵财, 尚可政, 王式功, 等. 贺兰山对银川一次致灾暴雨过程影响的数值模拟[J]. 中国沙漠, 2015, 35(2):464. NING Guicai, SHANG Kezheng, WANG Shigong, et al. Numerical simulation of terrain effects of the Helan Mountain on a rainstorm process in Yinchuan, Ningxia, China[J]. Journal of Desert Research, 2015, 35(2):464.
[2]	杨淑萍, 孙银川, 尤志宇, 等. 宁夏地质灾害气象条件的初步研究[J]. 新疆气象, 2005, 28(6):7. YANG Shuping, SUN Yinchuan, YOU Zhiyu, et al. A preliminary study of Ningxia on meteorological conditions geological disasters[J]. Bimonthly of Xinjiang Meteorology, 2005, 28(6):7.
[3]	魏晓, 孙峰华. 宁夏水土保持及区划研究[J]. 水土保持研究, 2005, 12(6):119. WEI Xiao, SUN Fenghua. Study on soil and water conservation of Ningxia and its division[J]. Research of Soil and Water Conservation, 2005, 12(6):119.
[4]	LIN Derguey, HUANG Borshun, LIN Shinhwei. 3-D numerical investigations into the shear strength of the soilroot system of Makino bamboo and its effect on slope stability[J]. Ecological Engineering, 2010, 36(8):992.
[5]	CHOK Y H, JAKSA M B, KAGGWA W S, et al. Assessing the influence of root reinforcement on slope stability by finite elements[J]. Geo-Engineering, 2015, 6(12):13.
[6]	KOKUTSE N K, TEMGOUA A G, KAVAZOVIC Z. Slope stability and vegetation:Conceptual and numerical investigation of mechanical effects[J]. Ecological Engineering, 2016, 86(1):146.
[7]	MICKOVSKI S B, STOKES A, van BEEK R, et al. Simulation of direct shear tests on rooted and non-rooted soil using finite element analysis[J]. Ecological Engineering, 2011, 37(10):1523.
[8]	MAO Zhun, YANG Ming, BOURRIER F, et al. Evaluation of root reinforcement models using numerical modelling approaches[J]. Plant and Soil, 2014, 381(1/2):249.
[9]	易绍基. 基于ABAQUS的边坡稳定敏感性分析及模型验证[D]. 昆明:昆明理工大学, 2011:20. YI Shaoji. Sensitivity analysis and model verification of slope stability based on ABAQUS[D]. Kunming:Kunming University of Science and Technology, 2011:20.
[10]	RAHARDJO H, ONG T H, REZAUR R B, et al. Response parameters for characterization of infiltration[J]. Environmental Earth Sciences, 2010, 60(7):1369.
[11]	YUBONCHIT S, CHINKULKIJNIWAT A, HORPIBULSUK S, et al. Influence factors involving rainfall-induced shallow slope failure:numerical study[J]. International Journal of Geomechanics, 2017, 17(7):387.
[12]	CHINKULKIJNIWAT A, YUBONCHIT S, HORPIBULSUK S, et al. Hydrological responses and stability analysis of shallow slopes with cohesionless soil subjected to continuous rainfall[J]. Canadian Geotechnical Journal, 2016, 53(12):2001.
[13]	赵晓春, 刘建军, 任军辉, 等. 贺兰山4种典型森林类型凋落物持水性能研究[J]. 水土保持研究, 2011, 18(2):107. ZHAO Xiaochun, LIU Jianjun, REN Junhui, et al. Study on water-holding capacity of litter in four forest types of Helan Mountain[J]. Research of Soil and Water Conservation, 2011, 18(2):107.
[14]	胡欣. 湿陷性黄土路基水分场及其变形特性数值分析[D]. 重庆:重庆交通大学, 2016:10. HU Xin. The numerical analysis on moisture field and deformation characteristics of collapsible loess subgrade[D]. Chongqing:Chongqing Jiaotong University, 2016:10.
[15]	谢仁海. 渠天祥, 钱光谟. 构造地质学[M]. 徐州:中国矿业大学出版社, 2007:25. XIE Renhai. QU Tianxiang, QIAN Guangmu. Tectonic geology[M]. Xuzhou:China University of Mining and Technology Press, 2007:25.
[16]	田佳, 及金楠, 钟琦, 等. 贺兰山云杉林根土复合体提高边坡稳定性分析[J]. 农业工程学报, 2017, 33(20):144. TIAN Jia,JI Jinnan,ZHONG Qi,et al. Analysis on improvement of slope stability in root-soil composite of Picea crassifolia forest in Helan Mountain[J]. Transactions of the CSAE, 2017, 33(20):144.
[17]	及金楠, 张志强, 郭军庭, 等. 黄土高原刺槐和侧柏根系固坡的有限元数值模拟[J]. 农业工程学报, 2014, 30(19):146. JI Jinnan, ZHANG Zhiqiang, GUO Junting, et al. Finite element numerical simulation of Black Locust (Robinia pseudoacacia) and Arborvitae (Platycladus orientalis) roots on slope stability on Loess Plateau of China[J]. Transactions of the CSAE, 2014, 30(19):146.
[18]	田佳, 曹兵, 及金楠, 等. 花棒根土复合体直剪试验的有限元数值模拟与验证[J]. 农业工程学报, 2015, 31(16):152. TIAN Jia, CAO Bing, JI Jinnan, et al. Numerical simulation of direct shear test for root-soil composite of Hedysarum scoparium using a finite element method[J]. Transactions of the CSAE, 2015, 31(16):152.
[19]	JI Jinnan, KOKUTSE N, GENET M, et al. Effect of spatial variation of tree root characteristics on slope stability. A case study on Black Locust (Robinia pseudoacacia) and Arborvitae (Platycladus orientalis) stands on the Loess Plateau, China[J]. Catena, 2012, 92:139.
[20]	费康,张建伟. ABAQUS在岩土工程中的应用[M]. 北京:中国水利水电出版社,2013:223. FEI Kang, ZHANG Jianwei. Application of ABAQUS in geotechnical engineering[M]. Beijing:China Water Conservancy Press, 2013:223.
[21]	李宁, 许建聪. 基于ABAQUS的三维边坡降雨入渗模块的开发及其应用[J]. 岩土工程学报, 2015, 37(4):668. LI Ning, XU Jiancong. Development and application of three-dimensional rainfall infiltration module based on ABAQUS[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4):668.
[22]	李宁,刘冠麟,许建聪,等. 降雨条件下边坡有限元强度折减法计算平台开发及其应用[J]. 水文地质工程地质, 2018, 45(3):63. LI Ning, LIU Guanlin, XU Jiancong, et al. Development of shear strength reduction analysis under rainfall conditions method and its for slope stability application[J]. Hydrogeology and Engineering Geology, 2018, 45(3):63.