黏合剂与纤维组合对喷播基质材料抗剪性能及植物生长的影响
Effect of different binder and fiber combinations on shear resistance of substrate and plant growth of spray seeding
张传耀 1胡兴波 2叶康军 2赵斌 2徐金鹏 3李金波 4宋桂龙4
作者信息
- 1. 北京林业大学草业与草原学院,北京 100083
- 2. 北京市首发天人生态景观有限公司,北京 102600
- 3. 宁夏华硕生态农业科技有限公司,宁夏 银川 753000
- 4. 北京林业大学草业与草原学院,北京 100083;国家林业草原运动场与护坡草坪工程技术研究中心,北京 100083
- 折叠
摘要
[目的]明确添加"黏合剂+植物纤维"对客土喷播初期基质抗剪性能和植物生长的影响,为工程实践提供参考.[方法]采用环刀法、直接剪切法和模拟坡面法,选择聚丙烯酰胺(PAM)和聚乙烯醇(PVA)2种黏合剂与棕榈纤维(PF)、椰丝纤维(CF)、剑麻纤维(SF)、木纤维(WF)4种植物纤维,探究黏合剂和纤维两两组合下喷播基质的孔隙度、抗剪性能及植被生长特征.[结果]1)PAM+SF组合孔隙度表现最优,其总孔隙度和毛管孔隙度显著高于CK(P<0.05),分别是CK的1.26倍和1.37倍;2)添加PAM能够提高纤维-土复合体的抗剪强度,PAM+CF和PAM+SF组合内摩擦角显著大于CK和其他处理组(P<0.05),分别是CK的1.71倍和1.88倍,PAM+PF组合内聚力显著高于CK(P<0.05),是CK的1.14倍.3)PVA+SF组合的植物生长状况最优,总生物量与根冠比显著大于CK(P<0.05).[结论]添加PAM的组合能够提高喷播基质的抗剪性能;2种黏合剂相比,添加PAM的组合抗剪强度优于添加PVA的组合.并且喷播基质的抗剪性能变化由黏合剂和植物纤维共同影响.添加"黏合剂+植物纤维",对植被生长恢复友好.
Abstract
[Objective]To investigate the effect of adding"binder + plant fiber"on the shear performance and plant growth of the substrate during the early stages of guest soil spraying,and to provide reference for engineering practice.[Method]The ring knife method,direct shear method and simulated slope method were employed.Two binders,Polyacrylic amide(PAM)and Polyvinyl alcohol(PVA),and four plant fibers,palm fiber(PF),coconut fi-ber(CF),sisal fiber(SF)and wood fiber(WF),were selected.The porosity,shear resistance and vegetation growth characteristics of sprayed substrates were investigated under the two combinations of binder and fiber.[Result]The results showed that(1)PAM+SF exhibited the highest porosity,with total and capillary porosity significantly higher than CK(P<0.05),at 1.26 and 1.37 times higher than those of CK,respectively;(2)Addition of PAM enhanced the shear strength of the fiber-soil composite,with internal friction angles of PAM+CF and PAM+SF significantly higher than those of CK and other treatment groups(P<0.05),at 1.71 and 1.88 times higher than those of CK,re-spectively,while the cohesion of PAM+PF combination was significantly higher than that of CK(P<0.05),at 1.14 times higher than that of CK;(3)PVA+SF combination showed the best plant growth condition,with total biomass to root crown ratio significantly greater than CK(P<0.05).[Conclusion]Combining with PAM can im-prove the shear resistance of the sprayed substrate;PAM exhibited better shear strength compared to PVA.Shear re-sistance of sprayed substrates was influenced by both binder and plant fiber.The"binder + plant fiber"combination promotes vegetation growth recovery.
关键词
客土喷播/黏合剂/植物纤维/孔隙度/抗剪强度/植物生长Key words
spray seeding/polymeric adhesives/plant fibers/porosity/shear strength/plant growth引用本文复制引用
基金项目
北京市首发天人生态景观有限公司科研项目(2022HXKFCXY001)
出版年
2024
NETL
NSTL
万方数据