Drainage Design of Channel Land Consolidation Project in Gully Areas of Loess Hilly Region

Dou Shaohui; Gao Jianen; Li Xinghua; Gao Zhe; Liu Sixuan; Zhou Fanfan

doi:10.13961/j.cnki.stbctb.20200628.002

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Drainage Design of Channel Land Consolidation Project in Gully Areas of Loess Hilly Region

- Drainage Design of Channel Land Consolidation Project in Gully Areas of Loess Hilly Region
- Bulletin of Soiland Water Conservation Vol. 40, Issue 3, Pages: 310-316(2020)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所水利部水土保持生态工程技术研究中心, 陕西杨凌,712100
  3. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20200628.002
  CLC： S157.2
- Published：2020
- 稿件说明：
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Dou Shaohui, Gao Jianen, Li Xinghua, et al. Drainage Design of Channel Land Consolidation Project in Gully Areas of Loess Hilly Region[J]. Bulletin of Soiland Water Conservation, 2020, 40(3): 310-316.
DOI：

Dou Shaohui, Gao Jianen, Li Xinghua, et al. Drainage Design of Channel Land Consolidation Project in Gully Areas of Loess Hilly Region[J]. Bulletin of Soiland Water Conservation, 2020, 40(3): 310-316. DOI： 10.13961/j.cnki.stbctb.20200628.002.

摘要

[目的] 针对黄土丘陵沟壑区沟道土地整治工程新造地排水困难而引发的土地不均匀沉降、盐碱化、坝体管涌等灾害问题，探索沟道土地整治工程的排水设计方式，为今后相关领域的排水设计提供参考。[方法] 以陕西省延安市羊圈沟子流域为研究对象，基于小流域暴雨设计标准，结合室内试验结果和相关设计规范，设计一种碎石与盲沟相结合的排水方式，并通过后期原型观测验证工程设计。[结果] ①新造地排水设计3条截面均为1 m×0.5 m，长度分别为60，30，30 m，坡降为6%~10%的地下盲沟。盲沟用粒径50~80 mm的碎石填充，并用无纺土工布包裹，盲沟排水通过挡土坝收集于下游水窖并进行利用；②野外初步监测表明，在次降雨54.2 mm的情况下，对比无工程措施的沟道新造地，碎石盲沟排水工程可分别使新造地土壤含水率和电导率的增幅相对降低46.81%和3.61%。[结论] 碎石盲沟排水设计可有效缓解沟道新造地土壤的蓄水和盐碱化程度，从而提升沟道新造地的风险响应能力。

Abstract

[Objective] Considering the problems of uneven settlement

salinization

dam piping

and other disasters caused by the difficulty of new land reclamation and drainage in gully areas of loess hilly regions

the drainage design method of a channel land consolidation project was explored to provide reference for drainage design in related fields in the future.[Methods] The Yangjuangou subbasin in Yan'an City

Shaanxi Province

was taken as the study area

based on the design criteria of the stormwater in a small basin. Indoor experimental results were combined with related design specifications. The subsurface drainage method combined gravel and blind ditch

and it was verified by the engineering design through post prototype observation.[Results] ① The new land drainage design had three cross-sectional areas of 1 m×0.5 m

with lengths of 60

and 30 m

and a slope of 6%-10% of the underground blind ditches. The blind ditches were filled with gravel with particle size of 50-80 mm and wrapped with nonwoven geotextile. Blind ditch drainage was collected by the retaining dam in the downstream leeches and was utilized.② Initial monitoring in the field indicated that

in the case of a subrainfall of 54.2 mm

compared with the new land without any engineering measures

the gravel blind ditch drainage project could reduce the increase in soil moisture content and conductivity of new land by 46.81% and 3.61%

respectively.[Conclusion] The drainage design using gravel blind ditch could effectively alleviate the water storage and salinization degree of new land soil in the channel

thereby improving the risk-response capability.

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references

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