摘要
在工程建设过程中常产生水土流失现象,影响边坡的稳定性。水土保持护坡工程对于恢复和构建良好的生态环境有着重要的价值。植生袋因其制作简单、施工方便、植物生长效果好等优点,逐步用于路基边坡的生态防护。天然黄麻制成的植生袋具有突出的环保性与经济性。为探究黄麻植生带基本物理和力学性能及其在实际工程中的稳定性,本研究对植生袋的常用麻布材料进行密度、拉伸与撕裂强度的物理与力学性能测试,并结合路基边坡的条件分析黄麻植生袋在路基边坡上的稳定性。结果表明:黄麻布的基本性能满足国家标准对植生袋的性能要求。在强降雨的饱和条件下,黄麻植生袋稳定性不足,须采用加固措施;基于锚杆的抗拔稳定性,建立锚杆挂网加固的黄麻植生袋稳定性评估方法,结合实例说明锚杆挂网对于增强黄麻植生袋在路基边坡的稳定性非常有效。
[Background]In the process of engineering construction,soil erosion often occurs,which affects the stability of the slope.Soil and water conservation slope protection project is important for restoring and building a good ecological environment.The plant bag made of natural jute has outstanding environmental protection and economy.The jute fiber can provide nutrients for plants after decomposition.There are few studies on the stability analysis of the bag itself,and the planting bag itself is more prone to be damaged under heavy rainfall.Therefore,the stability analysis is crucial.[Methods]In order to explore the basic physical and mechanical properties of jute planting bag and its stability in practical engineering,the physical and mechanical properties of density,tension and tear of common jute cloth materials for planting bag were tested.Based on the basic assumptions,the stabilities of jute planting bags under natural conditions and heavy rainfall conditions were calculated according to the force balance method and the conditions of subgrade slope,and the evaluation method of bag stability was proposed by calculating the stability coefficient.[Results]1)The average tensile strength of the two types of jute cloth were 14.7 kN/m and 22.2 kN/m,the average elongation at break were 6.1%and 10.7%,and the average tearing strength were 0.35 kN/m and 0.56 kN/m,respectively.The basic performance met the performance requirements of national standards for planting bags.2)Under the condition of force equilibrium,the stability coefficient of jute planting bags under natural conditions was 1.51,thus the stability of jute planting bags on the subgrade slope was good.The stability coefficient was 0.52 under the saturated condition of heavy rainfall,which was insufficient.3)The jute planting bags were reinforced by anchor mesh.The pull-out safety coefficient of the anchor was 1.58,therefore the jute planting bags were of good stability.[Conclusions]The basic performance of jute cloth meets the performance requirements of national standards for planting bags.Under the saturated condition of heavy rainfall,the stability of jute planting bag is insufficient,and reinforcement methods should be adopted.Based on the pullout stability of anchor rod,the stability evaluation method of jute planting bags reinforced by anchor mesh is established.Combined with examples,it is proved that anchor mesh is very effective to enhance the stability of jute planting bags on subgrade slope.
作者
刘昆珏
刘问
刘明西
樊旭
LIU Kunjue;LIU Wen;LIU Mingxi;FAN Xu(Yunnan Construction Investment Holding Group Co.,Ltd.,650000,Kunming,China;School of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China)
出处
《中国水土保持科学》
CSCD
北大核心
2022年第6期67-73,共7页
Science of Soil and Water Conservation
基金
云南省交通运输厅科技项目“高寒生态脆弱山区困难立地条件下公路边坡生态修复技术研究”([2018]39)。
关键词
路基边坡
力学性能
稳定性
锚杆挂网加固
黄麻植生袋
subgrade slope
mechanical performance
stability
anchor mesh reinforcement
jute planting bag
