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1.江苏科技大学 土木工程与建筑学院,江苏 镇江 212000
2.河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098
MEI Ling (1982- ), PhD, associate professor, main research interest: slope engineering, E-mail: mling530@163.com.
Received:12 January 2021,
Published:25 February 2023
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MEI Ling, CHEN Yuxiang, WANG Lei, et al. Experimental analysis on the ratio of green spraying substrate composed of dredging soil[J]. Journal of Civil and Environmental Engineering, 2023, 45(1): 135-144.
MEI Ling, CHEN Yuxiang, WANG Lei, et al. Experimental analysis on the ratio of green spraying substrate composed of dredging soil[J]. Journal of Civil and Environmental Engineering, 2023, 45(1): 135-144. DOI: 10.11835/j.issn.2096-6717.2021.059.
航道疏浚土与日俱增,利用疏浚土配制喷播基质用于坡面绿化,可以实现疏浚土的资源化利用。以疏浚土为主要试验材料,采用L
25
(5
3
)正交试验设计,在疏浚土中添加不同比例的聚丙烯酰胺(PAM)、高分子吸水性树脂(SAP)、稻草秸秆进行改良,并种植高羊茅进行盆栽试验,测定各试验组的物理结构特征、水分特征、化学性质、高羊茅出苗率等指标,分析PAM、SAP、稻草秸秆对疏浚土的影响,通过主成分分析法综合评价,得到基于疏浚土配制绿化喷播基质的配比。结果表明:在疏浚土中加入SAP能显著改善疏浚土的孔隙特性,降低土壤容重,提高疏浚土的持水能力;适量的PAM可以提高疏浚土中铵态氮的保留量,促进高羊茅种子的发芽,过量的PAM会抑制高羊茅种子的发芽;秸秆能显著提高疏浚土的养分含量,降低疏浚土的pH值;基质的最佳配比为每kg疏浚土内添加SAP 6 g、PAM 0.5 g、秸秆35 g。
The dredged soil of waterway is increase day by day
and the utilization of dredged soild to make spray seeding matrix for slope greening can realize the resource utilization of dredged soil. The L
25
(5
3
) orthogonal test design was adopted with dredged soil as the main test material
and different proportions of PAM
SAP and straw were added to the dredged soil for improvement
and tall fescue was planted for pot experiment. The physical structure characteristics
moisture characteristics
chemical properties and tall fescue emergence rate of each test group were measured. The effects of PAM
SAP and rice straw on the dredged soil were analyzed. Through the comprehensive evaluation of the principal component analysis method
the ratio of the green spraying substrate based on the dredged soil was obtained. The results show that adding SAP to the dredged soil can significantly improve the pore characteristics of the dredged soil
reduce the soil bulk density
and increase the water holding capacity of the dredged soil; an appropriate amount of PAM can increase the retention of ammonium nitrogen in the dredged soil and promote tall fescue seeds. Excessive PAM will inhibit the germination of tall fescue seeds; straw can significantly increase the nutrient content of the dredged soil and reduce the pH value of the dredged soil; the optimal ratio of the substrate is 6 g of sap
0.5 g of PAM and 35 g of straw per kg of dredged soil.
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