[1]LIU Sixuan,GAO Jianen,LI Wenzheng,et al.Effect of Slope Excavation on Anti-Erosion of Soil in Loess Hilly Region[J].Research of Soil and Water Conservation,2022,29(02):23-30.
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Effect of Slope Excavation on Anti-Erosion of Soil in Loess Hilly Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 02
Page number:
23-30
Column:
Public date:
2022-03-20
- Title:
- Effect of Slope Excavation on Anti-Erosion of Soil in Loess Hilly Region
- Keywords:
- loess hilly region; slope excavation; soil anti-erodibility; soil macroaggregates; soil organic carbon
- CLC:
- S157.2
- DOI:
- -
- Abstract:
- In order to expand agricultural and other economic land in the process of high-quality development of the Loess Plateau, a large number of slope excavation works affect the erosion resistance of soil on the slope, the excavated slope surface in the Yangjuangou watershed in Yan'an City was used as the object, and the unexcavated slope surface was used as a control, changes in time and space characteristics of soil erosion resistance of excavated slope were examined by field sampling and indoor sample measures. The results show that:(1)on the slope with excavation rate of 7%, as the slope position declines, the average weight diameter(MWD)of the soil aggregates and the organic carbon content of the excavated slope first increase and then decrease, and show the gradual increase trend on the control slope; the MWDs of the excavation slope in the downslope area and the excavation area reduceby 6%～8% and 58%～73%, respectively, compared with that in the middle slope area; the content of soil organic carbon significantly reduces by 8%～41% in the 0—80 cm soil layer in the downslope area, and by 10%～39% in 0—40 cm layer in the excavation area, respectively;(2)the KS value of soil erodibility decreases with the slope position, first decreases and then increases on the excavated slope, and gradually decreases on the control slope; compared with the middle slope area, the KS values of the downslope area and the excavation area increases by 4.8%～5% and 65%～109.7%, respectively;(3)the KS value of slope soil erodibility increases with the increase of the excavation rate, and the correlation of KS value with the organic carbon content decreases with the increase of the excavation rate; on the slope with an excavation rate of 7%, the annual change of the soil erosion resistance of the downslope area shows the significant decreasing trend. Therefore, in the later slope protection process of the excavated slope, not only should the protection of the stability of the excavation area be strengthened, but also attention to the reduction of soil erosion risk at the upper slope of the excavation area should be paid. These research results can provide scientific guidance and theoretical support for slope excavation engineering design and safety protection.
- References:
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Last Update:
2022-04-20