W-OH材料砂土固结体抗水流冲击性能

doi:10.16843/j.sswc.2021.03.011

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Abstract [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 and there was a positively linear relationship with the critical flow velocity with different concentrations. Additionally, the impact of flow velocity on the solidified layer was significant, but the slope angle was less.[Conclusions] The results indicate that W-OH concentration has a significant effect on the impact resistance of solidified layer and W-OH can be used to solidify soil. This will provide a theoretical basis for the application of W-OH in the prevention and control of soil erosion.

Key words： W-OH solidification material water and soil conservation flow impact soil erosion

Received: 13 February 2020

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S157.2

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	LIANG Zhishui
	WU Zhiren
	ZHANG Lixin
	GAO Haiying

Cite this article:

LIANG Zhishui,WU Zhiren,ZHANG Lixin, et al. Resisting water impact performance of solidified sandy soil by W-OH[J]. SSWC, 2021, 19(3): 89-94.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2021.03.011 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2021/V19/I3/89

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