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当前位置: 首页 > 文章 > 紫色土坡耕地埂坎水分衰减下土压力非线性分布 水土保持通报 2019 (6) 149-154
Position: Home > Articles > Non-linear Distribution of Soil Pressure Under Water Attenuation on Purple Soil Sloping Farmland Bunds Bulletin of Soil and Water Conservation 2019 (6) 149-154

紫色土坡耕地埂坎水分衰减下土压力非线性分布

作  者：
罗华进;韦杰;孙宇辉
单  位：
重庆师范大学地理与旅游学院;三峡库区地表过程与环境遥感重庆市重点实验室
关键词：
土压力;埂坎;坡耕地;紫色土;三峡库区
摘  要：
[目的]揭示紫色土坡耕地埂坎土压力分布特征及其影响因素,为三峡库区乃至长江上游地区的紫色土坡耕地埂坎优化设计、建设与维护提供科学依据。[方法]采用土槽模拟试验,向土槽注水至土壤基本饱和,使用静态应变仪分层采集土压力,采用烘干法测量各层土壤水分含量,分析土壤水分衰减过程中土压力变化特征。[结果]①土压力随着土层深度的增加呈非线性分布,表现为土压力先随着土层深度的增加而增大,在距离试验土槽底部0.375 H左右达到最大,然后又随着土层深度的增加而减小。②试验条件下,土壤水分饱和后随着时间的变化呈近似线性衰减,并对土压力产生了显著影响(p<0.01),但不同土层间存在一定差异。③土层深度和土壤水分含量的交互效应对土压力的影响显著(p<0.01)。[结论]三峡库区紫色土坡耕地埂坎土压力呈非线性分布,土层深度和土壤水分含量及其交互效应对埂坎土压力均存在显著影响。
译  名：
Non-linear Distribution of Soil Pressure Under Water Attenuation on Purple Soil Sloping Farmland Bunds
作  者：
Luo Huajin;Wei Jie;Sun Yuhui;School of Geography and Tourism Science, Chongqing Normal University;Chongqing Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area;
关键词：
soil pressure;;bunds;;sloping farmlands;;purple soil;;the Thres Gorges reservoir
摘  要：
[Objective] The distribution characteristics of soil pressure on purple soil sloping farmlands bunds and its influencing factors were studied in order to provide basis for the optimal design, construction and maintenance of the purple soil sloping farmland bunds in the Three Gorges reservoir area and the upper reaches of the Yangtze River. [Methods] Using soil bin simulation test, water was injected into the soil bin until the soil was basically saturated. Soil pressure was determined by static strain gauge, and soil moisture content was measured by drying method to analyze the variation characteristics of soil pressure under water attenuation. [Results] ① The soil pressure presented a nonlinear distribution with the increase of soil depth, which showed that the soil pressure initially increased with the increase of soil depth, reached the maximum at about 0.375 H from the bottom of the test device, and subsequently decreased with the increasing soil depth. ② Under the experimental conditions, the change of soil moisture content presented an approximate linear attenuation with time, and had a significant impact on the soil pressure(p<0.01), but there were some differences among different soil layers. ③ The interaction effect of soil depth and soil moisture content on soil pressure was significant(p<0.01). [Conclusion] The distribution of soil pressure show a non-linear trend on purple-soil sloping farmlands bunds in the Three Gorges reservoir area, the soil depth, soil moisture content and their interactive effects have significant effects on the soil pressure.

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