基于边坡稳定的黄土梯田优化设计

doi:10.16843/j.sswc.2020.04.003

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Abstract [Background] Terrace is an important soil and water conservation and agricultural measure in the Loess Plateau of China. Due to the implementers of terrace are mostly farmers, the section of terrace is arbitrary, and the quality of terrace might be poor, the landslide disaster of terrace occurs frequently in this area. Therefore, it is of a great theoretical and practical significance to study how to optimally design the section of terrace under the premise of ensuring slope stability in the Loess Plateau. [Methods] On the basis of field investigation and indoor geotechnical test, the section and soil mechanical parameters of loess terraces were obtained, and the finite element simulation model of stability analysis of loess terraces under rainfall conditions was established by using the general finite element software ABAQUS. The model was used to calculate the safety factor (F_s) of level terrace, alternate terrace, and original slope (control) under different rainfall conditions (rainfall infiltration intensity (20-40 mm/h), rainfall duration (24-168 h), and multi-factorial covariance analysis was carried out to obtain the main factors affecting the stability of loess terrace. The orthogonal test design was used to calculate the range for the slope of ridge, slope of ground, field width of three level terrace design parameters, and combined with the grey correlation method to conduct a secondary correction of the range, in order to get the sensitivity of the design parameters and optimize the design scheme. [Results] 1)The main factors affecting the stability of loess terrace was: duration of rainfall > slope of ground > rainfall infiltration intensity > type of terrace. The stability of level terrace and alternate terrace were significantly higher than that of the original slope, but the stability difference between level terrace and alternate terrace was not significant. 2) The sensitivity of the three design parameters to safety factor (F_s) was as follows: slope of ground (0.081) > field width (0.007) > slope of ridge (0.001). The sensitivity of slope of ground to safety factor was 12 times than that of the field width and 81 times than that of the slope of ridge, and the sensitivity of the field width to safety factor was 7 times more than that of the slope of ridge. 3) Under the level of design parameters, the optimal design scheme of terrace was as follows: slope of ground=18°, slope of ridge=65°, and field width=9 m. [Conclusions] Rainfall is an important factor affecting the stability of loess terrace. When level terrace are designed under rainfall conditions, the smaller the slope of ground is, the better the stability is, but the best combination can be determined only after the range analysis of the field width and slope of ridge. When the slope of ground cannot be changed, special attention should be paid to the design of the field width in order to make the loess terrace more stable.

Key words： slope stability orthogonal test optimized design range analysis loess terrace

Received: 02 September 2019

PACS:

S157.2

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	Articles by authors
	LIU Jiali
	TIAN Jia
	ZHENG Tiantian
	LI Yalong
	YANG Penghui
	WANG Baoying
	JIN Xuejuan

Cite this article:

LIU Jiali,TIAN Jia,ZHENG Tiantian, et al. Optimized design of loess terrace based on slope stability[J]. SSWC, 2020, 18(4): 21-28.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.04.003 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I4/21

[1]	马良瑞, 梅再美. 梯田断面设计与优化研究[J]. 贵州科学, 2012, 30(2):45. MA Liangrui, MEI Zaimei. A study of terrace cross section and its optimal design[J]. Guizhou Science, 2012, 30(2):45.
[2]	温永福. 极端降雨条件下黄土区梯田边坡稳定性模拟试验研究[D]. 陕西杨凌: 西北农林科技大学, 2018:1. WEN Yongfu. Experimental research of the stability of terrace slopes in loess area under extreme rainfall[D]. Yangling, Shaanxi: Northwest A & F University, 2018:1.
[3]	岳自慧, 眭克仁, 刘平, 等. 宁南山区坡改梯作物产量变化规律研究[J]. 中国水土保持, 2017(9):56. YUE Zihui, XU Keren, LIU Ping, et al. Study on change rule of terracing crop yield of the mountain area in southern Ningxia[J]. Soil and Water Conservation in China, 2017(9):56.
[4]	李梦华, 石云, 马永强, 等. 基于面向对象的黄土丘陵沟壑区梯田信息提取研究[J]. 测绘与空间地理信息, 2019, 42(5):50. LI Menghua, SHI Yun, MA Yongqiang, et al. Terrace information extraction in loess hilly-gully region landscape based on object-oriented classification method[J]. Geomatics & Spatial Information Technology, 2019, 42(5):50.
[5]	程圣东, 杭朋磊, 李鹏, 等. 陕南土石山区坡改梯对坡面稳定性的影响[J]. 水土保持研究, 2018, 25(5):157. CHENG Shengdong, HANG Penglei, LI Peng, et al. Effects of terracing on the slope stability in the rocky mountain area of southern Shaanxi province[J]. Research of Soil and Water Conservation, 2018, 25(5):157.
[6]	杨柳, 郝仕龙, 范云鹏. 豫西南土坎水平梯田田坎稳定性分析[J]. 水土保持研究, 2018, 25(1):282. YANG Liu, HAO Shilong, FAN Yunpeng. Analysis of the ridge stability of level terrace in southwest Henan province[J]. Research of Soil and Water Conservation, 2018, 25(1):282.
[7]	孙凡. 土水特征对降雨条件下黄土边坡稳定性的影响研究[D]. 西安: 西安理工大学, 2019:1. SUN Fan. Study on influence of soil water characteristics on stability of loess slope under rainfall conditions[D]. Xi'an: Xi'an University of Technology, 2019:1.
[8]	DYSON A P, TOLOOIYAN A. Optimization of strength reduction finite element method codes for slope stability analysis[J]. Innovative Infrastructure Solutions, 2018, 3(1):38.
[9]	陈勇, 杨贝贝. 基于ABAQUS的非饱和边坡流-固耦合分析[J]. 地下空间与工程学报, 2016, 12(4):938. CHEN Yong, YANG Beibei. The fluid-solid analysis of unsaturated slope based on ABAQUS[J]. Chinese Journal of Underground Space and Engineering, 2016, 12(4):938.
[10]	叶帅华, 时轶磊. 降雨入渗条件下多级黄土高边坡稳定性分析[J].工程地质学报, 2018, 26(6):1648. YE Shuaihua, SHI Yilei. Stability analysis of multistage high slope with loess under rainfall infiltration[J]. Journal of Engineering Geology, 2018, 26(6):1648.
[11]	CHINKULKIJNIWAT A, YUBONCHIT S, HORPIBULSUK S, et al. Hydrological responses and stability analysis of shallow slopes with cohesionless soil subjected to continuous rainfall[J]. Can. Geotech. J., 2016, 53(12):2001.
[12]	KUMAR S S, MIDHA V K. Influence of slope angle and rainfall intensity on the runoff erosion control performance of woven geomesh[J]. Journal of Natural Fibers, 2017(1):1.
[13]	温永福, 高鹏, 穆兴民, 等.极端降雨作用下陕北梯田边坡稳定性分析[J].水土保持研究, 2018, 25(4):365. WEN Yongfu, GAO Peng, MU Xingmin,et al. Analysis on the stability of slope in northern Shaanxi under extreme rainfall[J]. Research of Soil and Water Conservation, 2018, 25(4):365.
[14]	中华人民共和国水利部. GB/T50123—1999土工试验方法标准 [S]. 北京: 中国计划出版社, 1999:110. Ministry of Water Resources of the People's Republic of China. GB/T50123—1999 Standard for soil test [S]. Beijng: China Planning Press, 1999:110.
[15]	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.
[16]	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, 2011:61. YI Shaoji. Sensitivity analysis and model verification of slope stability based on ABAQUS[D]. Kunming:Kunming University of Science and Technology, 2011:61.
[17]	李娜. 陕北地区降雨诱发黄土滑坡的机理研究[D]. 西安: 西安建筑科技大学, 2017:30. LI Na. Study on trigger mechanism between rainfall and loess landslide in northern Shaanxi province[D]. Xi'an: Xi'an University of Architecture and Technology, 2017:30.
[18]	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.
[19]	侯文萃, 辛全才. 基于改进正交设计的黄土边坡稳定影响因素敏感性分析[J]. 土工基础, 2016, 30(2):209 HOU Wenxui, XIN Quancai.Loess slope stability analysis using improved orthogonal method[J]. Soil Engineering and Foundation, 2016, 30(2):209.
[20]	聂兵其, 汤明高, 邵山, 等. 基于灰色关联法的涉水边坡稳定性影响因素敏感性分析[J]. 长江科学院院报, 2019, 36(1):123. NIE Bingqi, TANG Minggao, SHAO Shan, et al.Sensibility analysis of influencing factors of reservoir slope stability based on grey correlation[J]. Journal of Yangtze River Scientific Research Institute, 2019, 36(1):123.
[21]	周东升, 杨凤芸. 基于正交试验的边坡稳定性影响因素敏感度分析[J]. 煤炭技术, 2018, 37(1):147. ZHOU Dongsheng, YANG Fengyun. Sensitivity analysis of influencing factors in slope stability analysis based on orthogonal test[J]. Coal Technology, 2018, 37(1):147.
[22]	李英华, 张明媛, 袁永博. 基于正交设计的基坑开挖放坡稳定影响因素敏感性分析[J]. 土木工程与管理学报, 2017, 34(1):113. LI Yinghua, ZHANG Mingyuan, YUAN Yongbo. Sensitivity analysis of the influence factors on slope excavation[J]. Journal of Civil Engineering and Management, 2017, 34(1):113.
[23]	赵永虎, 刘高, 毛举, 等. 基于灰色关联度的黄土边坡稳定性因素敏感性分析[J]. 长江科学院院报, 2015, 32(7):94. ZHAO Yonghu, LIU Gao, MAO Ju,et al. Sensitivity analysis for the stability of loess slope based on grey correlation degree[J]. Journal of Yangtze River Scientific Research Institute, 2015, 32(7):94.