Experiment study on the effect of arbor species planting on slope protection effect
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摘要:
近年来, 植被护坡作为一种生态友好型支护方式越来越多地被应用到斜坡支护工程中, 故如何科学地种植植被以充分发挥其护坡效果具有重要的研究意义。为此, 以乔木为研究对象, 结合3D打印技术制备乔木根系模型, 通过自行设计的滑坡模型试验系统, 开展了系统物理模型试验, 对3种根系排布方式与3种根系间距下乔木的护坡效果进行了研究。结果表明: ①在乔木根系支护下, 抗滑力峰值增大, 达到峰值的时间延长, 峰后抗滑力衰减程度降低。②对抗滑力的改善效果方面, 反拱型排布>正拱型排布>直线型排布>无根系支护。根系间距
S =1.5D (D 为根系间最大水平距离,D =7cm)与S =2.0D 对抗滑力的改善效果接近,S =2.5D 时抗滑力峰值最大。③就根系排布方式而言, 反拱型排布对坡体位移的改善效果最为明显, 正拱型排布与直线型排布对位移的改善效果接近; 就根系间距而言,S =2.5D 对坡体位移的改善效果最为明显,S =1.5D 与S =2.0D 对坡体位移的改善效果接近。④直线型排布下坡体滑动范围增大, 正拱型排布与反拱型排布则能有效限制坡体变形。根系间距对坡体变形场的影响不大。综上可知, 在乔木护坡工程中可通过控制乔木的排布方式与根系间距来提升其护坡效果。Abstract:Vegetation slope protection has become more popular in recent years as an environmentally friendly support approach for slope protection projects. Thus, it's critical to study how to properly plant vegetation to maximize its slope protection effect. As a result, this work uses arbor as the research object and 3D printing technology to construct a model of the arbor root. The slope protection effect of arbor was studied by using a self-designed landslide model test system and conducting systematic physical model tests with three different root arrangement modes and three different root spacings. The results reveal that: ①With tree roots supporting the slope, the peak value of anti-sliding force increases, the time to reach the peak value of anti-sliding force is substantially delayed, and anti-sliding force attenuation is reduced. ②Anti-arch arrangement>positive arch arrangement>linear arrangement>no root support in terms of anti-sliding force improvement.
S =1.5D (root coverage rangeD =7 cm) has a similar improved impact toS = 2.0D , whileS =2.5D has the highest peak value of anti-sliding force. ③In terms of the root arrangement mode, the anti-arch arrangement has the most obvious improvement effect on the slope displacement, while the positive arch arrangement and linear arrangement are close in terms of the improvement effect on the displacement. In terms of the root spacing,S =2.5D has the most obvious improvement effect on the slope displacement, whileS =1.5D andS =2.0D are close in terms of the improvement effect on the slope. ④Under the linear arrangement, the slope's sliding range expands, whereas the positive arch and anti-arch arrangements effectively limit slope deformation. Root spacing has no obvious effect on the slope deformation field.In conclusion, managing the arrangement mode of trees and root spacing in the vegetation protection project can increase the slope protection effect.-
Key words:
- arbor species /
- arrangement mode /
- root spacing /
- slope protection effect /
- physical model experiment
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图 7 不同排布方式抗滑力-时间曲线
Figure 7. Anti-sliding force with time curves of three root arrangement modes and no root support
图 8 不同根系间距抗滑力-时间曲线
Figure 8. Anti-sliding force with time curves of three root spacings and no root support
图 10 不同排布方式坡体位移-时间曲线
Figure 10. Slope displacement with time curves of three root arrangement modes and no root support
图 11 不同根系间距坡体位移-时间曲线
Figure 11. Slope displacement with time curves of three root spacings and no root support
图 12 第2 520s时不同排布方式变形场
Figure 12. Deformation field of different root arrangement modes at 2 520 s
图 13 第2 520 s不同根系间距变形场(D=7 cm)
Figure 13. Deformation field of different root spacings at 2 520 s(D=7 cm)
表 1 试验用土物理力学性质指标
Table 1. Physical mechanics of soil samples
wL/% wP/% IP ρ/(g·cm-3) ω/% c/kPa φ/(°) 21.4 12.6 8.8 1.77 14.0 11.0 19.4 注：wL为液限；wP为塑限；IP为塑性指数；ρ为密度；ω为含水率；c为内聚力；φ为内摩擦角 
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表 2 试验方案(D=7 cm)
Table 2. Testing scheme (D=7 cm)
试验工况 排布方式 根系间距/cm 1 无根系 2 直线型 1.5D(10.5 cm) 3 正拱型 1.5D(10.5 cm) 4 反拱型 1.5D(10.5 cm) 5 直线型 1.5D(10.5 cm) 6 直线型 2.0D(14.0 cm) 7 直线型 2.5D(17.5 cm)
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