W-OH材料砂土固结体抗水流冲击性能  

Resisting water impact performance of solidified sandy soil by W-OH

作　　者：梁止水[1] 吴智仁 张立欣 高海鹰[1] LIANG Zhishui;WU Zhiren;ZHANG Lixin;GAO Haiying(School of Civil Engineering, Southeast University, 210096, Nanjing, China;School of the Environment and Safety Engineering, Jiangsu University, 212013, Zhenjiang, Jiangsu,China;Inner Mongolia Kubuqi Desert Technology Research Institute, 017400, Ordos, Inner Mongolia, China)

机构地区：[1]东南大学土木工程学院,南京210096 [2]江苏大学环境与安全工程学院,江苏镇江212013 [3]内蒙古库布其沙漠技术研究院,内蒙古鄂尔多斯017400

出　　处：《中国水土保持科学》2021年第3期89-94,共6页Science of Soil and Water Conservation

基　　金：江苏省青年科学自然基金“干湿和冻融循环作用对W-OH材料固结砒砂岩的耐久性能影响机制研究”(BK20190348);国家重点研发计划课题“砒砂岩区生态安全保障技术”(2017YFC0504505);水利部水利技术示范项目“三峡库区坡耕地水土流失调控与资源高效利用技术集成与示范”(SF201905)。

摘　　要：W-OH是一种以水为固化剂的亲水性聚氨酯改性复合材料,可广泛用于荒漠化防治和水土保持,具有优异的抗风蚀和水蚀性能。为研究W-OH与砂土的固结体抗水流冲击效果,采用模拟水流冲击试验,研究在W-OH质量分数(3%、4%、5%、6%和7%)、坡度(0°、15°、30°、45°和60°)和水流冲击速度(4、5、6、7、8、9和10 m/s)条件下,W-OH固结体抗水流冲击的性能。结果表明:基于W-OH的砂土固结体有很好的抗水流冲击能力,坡度越大抗水流冲击能力越强,坡度为60°时的抗水流冲击时间是垂直冲击的11.3倍;W-OH质量分数越大抵抗水流冲击性越强,60°坡度下,7%质量分数W-OH土壤固结层的抗水流冲击破坏时间是3%垂直冲击的219倍;水流冲击时间设定为5 min,固结层冲击破坏时间随水流速度增加而减小,说明W-OH浓度对砂土固结体抗水流冲击效果的影响显著,且与固结层水流冲击破坏的临界水流流速呈正线性相关。同时水流速度对固结层的冲击影响较大,但坡度的影响较小。该结果将为W-OH材料在砂土侵蚀防治应用提供一定的理论基础。[Background]China is one of the countries facing the most serious soil erosion.Soil erosion is mainly caused by water erosion,which is mainly reflected in rain drop hitting and runoff erosion.The main control measures for this problem include forest and grass measures,engineering measures and farming measures.Recently,the measures of soil consolidation by materials have become a research trend because of their simple construction and remarkable soil consolidation effect,W-OH is a kind of hydrophilic polyurethane modified composite material,which is using water as curing agent.It can be applied for desertification control and water and soil conservation since it has excellent resistance to wind and rainfall erosion.The anti-scourability of the solidified consolidation layer has been studied in rainfall conditions but the flow impact performance is rarely reported now.[Methods]In order to study the effect of W-OH on the resisting flow impact performance of consolidated sandy soil,a simulated flow impact test was conducted under the conditions of W-OH concentration(3%,4%,5%,6%and 7%),slope angle(0,15°,30°,45°and 60°)and flow velocity(4,5,6,7,8,9 and 10 m/s).[Results]The solidified sandy soil based on W-OH had good resistance to water and splash erosion.The ability of splash resistance became stronger with the increase of the slope angle.The range of the flow impact resistance time did not change much when the slope angle was<45°.The range of the flow impact resistance greatly increased when the slope angle was>45°.Thus,the resisting performance at the slope angle of 60°was about 11.3 times of that in the condition of vertical impact.Additionally,the splash resistance increased significantly when the concentration of W-OH increased.The destruction time in the condition of 7%W-OH was about 219 times than that in the condition of 3%W-OH and vertical impact when the slope was fixed in 60°.Fixing the flow impact time as 5 min,the destruction time of solidified layer decreased with the increase of flow velocity an

关 键 词：W-OH 固结材料 水土保持 水流冲击 土壤侵蚀 

分 类 号：S157.2[农业科学—土壤学]