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=7 cm)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。
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 antisliding force improvement.S=1.5D(root coverage range D=7 cm)has a similar improved impact to S=2.0D,while S=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,while S=1.5D and S=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.
作者
姜彤
黄坤
薛雷
李龙飞
丁昊
王昊宇
Jiang Tong;Huang Kun;Xue Lei;Li Longfei;Ding Hao;Wang Haoyu(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;CAS Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2022年第6期233-241,共9页
Bulletin of Geological Science and Technology
基金
国家自然科学基金重大项目(42090052)
中国科学院A类战略性先导科技专项(XDA23090402)。
关键词
乔木
排布方式
根系间距
护坡效果
物理模型试验
arbor species
arrangement mode
root spacing
slope protection effect
physical model experiment
作者简介
姜彤(1973-),男,教授,主要从事岩土工程及滑坡灾害失稳机理方面的研究。E-mail:jiangtong@ncwu.edu.cn;通信作者:薛雷(1983-),男,副研究员,主要从事崩滑灾害失稳机理及其预测方面的研究。E-mail:xuelei@mail.iggcas.ac.cn。
