Influence of cement addition amount and maintenance duration on the erosion resistance for ecological restoration substrate
XIA Zhenyao1,2, HONG Huan1, GAO Feng1, SHAO Yanyan1, XIAO Hai1,2, YANG Yueshu1, LI Mingyi1, XU Wennian1,2
1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, 443002, Yichang, Hubei, China; 2. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, 443002, Yichang, Hubei, China
Abstract：[Background] Engineering construction can not only promote social and economic development, but also easily cause various environmental geological problems, especially many exposed slopes caused by traffic, mining, hydropower, and other engineering construction. Artificial ecological restoration is carried out to limit the negative effects, and the cement is usually added as binder into the ecological restoration substrate to improve its erosion resistance, however, the effects of cement addition amounts and maintenance duration on the erosion resistance for ecological restoration substrate are still unclear. [Methods] The amounts of different cement (0, 2%, 4%, 6% and 8%) were added to per 100 kg of the yellow brown soil with 6% organic materials and 4% habitat substrate modifier improver. The uniformly mixed materials were packed in a self-made ring knife (105 mm in diameter and 50 mm in height) to obtain a bulk density of 1.35 g/cm3 and maintenance with different durations (0, 7, 15, 30 and 45 d). The scouring experiment was conducted to obtain detachment capacity under the hydraulic conditions of slope 20° and runoff 25 L/min, and the stability of soil aggregate was also tested. [Results] 1) The detachment capacity of the ecological restoration substrate gradually reduced with the increasing of the maintenance duration under the same amount of cement addition. The detachment capacity of ecological restoration substrate was large within the first 15 d and the first 7 d at the 2%, 4% and at 6%, 8% of cement addition amounts, respectively. In addition, the detachment capacity of the ecological restoration substrate also decreased with the increasing of cement addition amount and was characterized by a rapid decrease followed by a gradual decrease under the same maintenance duration. 2) The power functions well described the relationship between the detachment capacity of ecological restoration substrate and the maintenance duration under different amount of cement addition (R2>0.789). And the relationship between the detachment capacity of ecological restoration substrate and the cement addition amount also described by power functions for different maintenance duration (R2>0.861). 3) The Mean Weight Diameter (MWD) and Geometric Mean Diameter (GMD) for the ecological restoration substrate aggregates showed significantly difference within 0-15 d maintenance duration while no significantly difference after then. The MWD and GMD for the ecological restoration substrate aggregates showed significant difference between with and without cement addition, and significant difference was found within the 6% of cement addition amount while no significant difference between 6% and 8% of cement addition amount existed for most maintenance duration. The relationship between the detachment capacity of ecological restoration substrate and MWD and GMD can be described by using the power function. [Conclusions] The detachment capacity suppresses while the aggregate stability enhances after the cement added into the ecological restoration substrate.
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2021, Vol. 19 
