紫色土坡耕地不同规格土坎稳定性分析
Stability analysis of different scale soil bunds on purple soil sloping farmlands
查看参考文献27篇
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文摘
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土坎稳定性对其发挥水土保持效益具有重要意义,分析紫色土坡耕地土坎规格对稳定性的影响可为三峡库区乃至长江上游紫色土区坡耕地整治、中低产田改造等工程中土坎规划设计和建造提供依据。根据野外调查结果,设定0.8、1.0、1.2和1.4 m 4种高度和50°、60°、70°和80° 4种外边坡坡度共组合成16种规格土坎。通过直剪试验获取紫色土埂坎土壤抗剪强度参数,利用极限平衡分析法计算稳定性系数、响应面分析法建立稳定性系数与高度和外边坡坡度响应模型。结果表明:土坎外边坡坡度一定时,稳定性系数随高度增加呈非线性衰减;高度一定时,稳定性系数随外边坡坡度变陡总体呈降低趋势。总体来看,土坎高度和外边坡坡度对其稳定性的影响极为显著(P < 0.01),但二者的交互效应对稳定性的影响不显著。研究规格范围内,土坎潜在滑动面最不稳定的土体条块基底抗剪力均大于运动剪切力。土坎稳定性系数随着运动剪切力和右侧剪切力的增加呈降低趋势,而基底法向力和右侧法向力变化对土坎稳定性系数没有明显影响。结合紫色土坎的稳定性特征、三峡库区紫色土坡耕地的条件和农民耕作的便利性,土坎高为1.0~ 1.2 m,外边坡约60°较为适宜。 |
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其他语种文摘
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[Background]Bunds are embankments constructed across the slope and along the contour, and play a key role in controlling soil erosion on sloping farmlands. Recently,it is unclear yet of the relationship between soil bund stability and scales. The aim of this work is to provide a basis for soil bund planning and design in the purple sloping farmland consolidation and lower-yield field reconstruction projects in the Three Gorges Reservoir area and even the upper Yangtze River,by revealing the purple soil bund stability response to scales. [Methods]We carried out field investigation,laboratory test, simulation and response surface analysis to reveal the stability of soil bunds under different height and slope conditions. We defined 4 levels of height (0.8,1.0,1.2,and 1.4 m at intervals of 0.2 m) and 4 levels of slope (50°,60°,70°,and 80° at intervals of 10°),a total of 16 soil bunds. The limit equilibrium analysis was adopted to calculate the stability coefficients,and the response surface analysis was adopted to build the model of purple soil bund stability responses to the bund size. [Results]The minimum of stability coefficient was 3.526,which indicated that all soil bunds defined in the present study were stable. When the outside slope was constant,the soil bund stability coefficients displayed a nonlinear reduction with the height increasing; however,when the height was constant,the soil bund stability coefficients decreased generally along with the outside slope,the average reduction was greater than 10% at each increasing interval under these two changing patterns. Overall,both the height and the outside slope had significant influences on the stability of soil bunds (P < 0.01),while the interactive effect was not significant. Regression equation fitted by height,outside slope and their quadratic terms of soil bund can be used for describing the relationship between stability and scales perfectly, the adjustment determination coefficient and variation coefficient were 93% and 5.88,respectively. The potential sliding surface of soil bund was characterized by a shear resistance force greater than the moving shear force. With an increasing of the base shear mobility force and the right side normal force,the soil bund stability coefficient showed a decreasing trend,with no noticeable change trend along with the base normal force and the right side shear force change. [Conclusions]The reasonable scale is 1.0 ~ 1.2 m of height and 60° of outside slope while considering purple soil bund stability features,slopping farmland conditions and ease for farmers to cultivate. |
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来源
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中国水土保持科学（中英文）
,2018,16(5):1-9 【核心库】
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DOI
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10.16843/j.sswc.2018.05.001
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关键词
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土坎规格
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稳定性
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紫色土
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坡耕地
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极限平衡分析
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地址
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1.
中国科学院水利部成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都, 610041
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重庆师范大学地理与旅游学院, 重庆, 401331
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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2096-2673 |
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学科
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农业基础科学 |
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基金
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国家自然科学基金
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重庆市基础与前沿研究计划项目
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文献收藏号
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CSCD:6369746
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参考文献 共
27
共2页
|
|
1.
韦杰. 紫色土坡耕地埂坎土壤抗剪性能对含水率的响应.
农业工程学报,2016,32(20):153
|
被引
12
次
|
|
|
|
|
2.
Wei W. Global synthesis of the classifications,distributions,benefits and issues of terracing.
Earth-Science Reviews,2016,159:388
|
被引
30
次
|
|
|
|
|
3.
薛萐. 黄土高原丘陵区坡改梯后的土壤质量效应.
农业工程学报,2011,27(4):310
|
被引
26
次
|
|
|
|
|
4.
焦菊英. 黄土丘陵区不同降雨条件下水平梯田的减水减沙效益分析.
水土保持学报,1999,5(3):59
|
被引
12
次
|
|
|
|
|
5.
Gallart F. Hydrological processes and their seasonal controls in a small Mediterranean mountain catchment in the Pyrenees.
Hydrology & Earth System Sciences,2002,6(3):527
|
被引
2
次
|
|
|
|
|
6.
Hammad A A. Effects of stonewalled terracing techniques on soil-water conservation and wheat production under Mediterranean conditions.
Environmental Management,2004,34(5):701
|
被引
7
次
|
|
|
|
|
7.
Vancampenhout K. Stone bunds for soil conservation in the northern Ethiopian highlands: Impacts on soil fertility and crop yield.
Soil & Tillage Research,2006,90(1):1
|
被引
9
次
|
|
|
|
|
8.
刘晓燕. 黄土丘陵沟壑区水平梯田减沙作用研究.
水利学报,2014,45(7):793
|
被引
30
次
|
|
|
|
|
9.
Adimassu Z. Effect of soil bunds on runoff,soil and nutrient losses and crop yield in the central highlands of Ethiopia.
Land Degradation & Development,2012,25(6):554
|
被引
15
次
|
|
|
|
|
10.
Amare T. Combined effect of soil bund with biological soil and water conservation measures in the northwestern Ethiopian highlands.
Ecohydrology & Hydrobiology,2014,14(3):192
|
被引
14
次
|
|
|
|
|
11.
Monsieurs E. Effects of drainage ditches and stone bunds on topographical thresholds for gully head development in North Ethiopia.
Geomorphology,2015,234(104/105):193
|
被引
1
次
|
|
|
|
|
12.
高霞. 陕南秦巴山区PP织物袋梯田筑坎土压力分布研究.
水土保持通报,2013,33(6):37
|
被引
5
次
|
|
|
|
|
13.
葛逸群. 砂质山区土坎梯田埂坎稳定性分析.
中国水土保持,1999(7):30
|
被引
3
次
|
|
|
|
|
14.
陈万铃. 紫色砂泥岩区梯地土坎稳定性及利用效益研究.
中国水土保持,1994(9):28
|
被引
1
次
|
|
|
|
|
15.
张宏. 紫色土抗剪强度差异分析及土坎优化设计.
西南大学学报(自然科学版),2015,37(5):31
|
被引
2
次
|
|
|
|
|
16.
顾再柯. 适合贵州非石质山区坡耕地整治的两种实用技术.
中国水土保持,2007(3):40
|
被引
1
次
|
|
|
|
|
17.
邵龙潭.
新编土力学教程,2013:192
|
被引
1
次
|
|
|
|
|
18.
刘杰. 简单边坡的稳定性分析.
岩土力学,2002,23(6):714
|
被引
8
次
|
|
|
|
|
19.
朱大勇. 简化Bishop法严格性的论证.
岩石力学与工程学报,2007,26(3):455
|
被引
14
次
|
|
|
|
|
20.
戴自航. 土坡稳定分析简化Bishop法的数值解.
岩土力学,2002,23(6):760
|
被引
17
次
|
|
|
|
|
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