紫色土坡耕地埂坎水分衰减下土压力非线性分布

罗华进; 韦杰; 孙宇辉

doi:10.13961/j.cnki.stbctb.2019.06.022

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紫色土坡耕地埂坎水分衰减下土压力非线性分布

试验研究

- 紫色土坡耕地埂坎水分衰减下土压力非线性分布
- Non-linear Distribution of Soil Pressure Under Water Attenuation on Purple Soil Sloping Farmland Bunds
- 水土保持通报 2019年39卷第6期页码：149-154
- 作者机构：
  
  1. 重庆师范大学地理与旅游学院,重庆,401331
  2. 三峡库区地表过程与环境遥感重庆市重点实验室,重庆,401331
- 作者简介：
- 基金信息：
  
  重庆市杰出青年科学基金“三峡库区坡耕地埂坎优势流及失稳判据研究”（cstc2019jcyjjqX0025）;重庆市教委科技项目“紫色土坡耕地埂坎裂隙发育及其失稳机制研究”（KJZD-K201800502）
- DOI：10.13961/j.cnki.stbctb.2019.06.022
  中图分类号：
- 纸质出版：2019
- 稿件说明：
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罗华进, 韦杰, 孙宇辉. 紫色土坡耕地埂坎水分衰减下土压力非线性分布[J]. 水土保持通报, 2019,39(6):149-154.

Luo Huajin, Wei Jie, Sun Yuhui. Non-linear Distribution of Soil Pressure Under Water Attenuation on Purple Soil Sloping Farmland Bunds[J]. Bulletin of Soiland Water Conservation, 2019, 39(6): 149-154.
罗华进, 韦杰, 孙宇辉. 紫色土坡耕地埂坎水分衰减下土压力非线性分布[J]. 水土保持通报, 2019,39(6):149-154. DOI： 10.13961/j.cnki.stbctb.2019.06.022.

Luo Huajin, Wei Jie, Sun Yuhui. Non-linear Distribution of Soil Pressure Under Water Attenuation on Purple Soil Sloping Farmland Bunds[J]. Bulletin of Soiland Water Conservation, 2019, 39(6): 149-154. DOI： 10.13961/j.cnki.stbctb.2019.06.022.

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。

Abstract

[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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