[1]邵 勇*,刘 瑾,杭 丹,等.水溶性稳定剂改良砂土的水理特性研究[J].江苏水利,2021,(04):1-7.
　SHAO Yong*,LIU Jin,HANG Dan,et al.Study on water physical properties of sandy soil improved by water-soluble stabilizer[J].JIANGSU WATER RESOURCES,2021,(04):1-7.
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水溶性稳定剂改良砂土的水理特性研究()
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《江苏水利》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2021年04期
页码:
1-7
栏目:
水利工程建设
出版日期:
2021-04-30

文章信息/Info

Title:
Study on water physical properties of sandy soil improved by water-soluble stabilizer
文章编号:
1007-7839(2021)04-0001-07
作者:
邵 勇1; 2*;  刘 瑾3;  杭 丹2;  孙少锐3;  王 颖3;  魏继红3
1.江苏省水利工程建设局, 江苏 南京 210085; 2.江苏省太湖治理工程建设管理局, 江苏 常州 213000; 3.河海大学 地球科学与工程学院, 江苏 南京 211100
Author(s):
SHAO Yong1; 2*;  LIU Jin3;  HANG Dan2;  SUN Shaorui3;  WANG Ying3;  WEI Jihong3
1.Water Conservancy Project Construction Bureau of Jiangsu Province, Nanjing 210029, China; 2.Jiangsu Province Taihu Governance Project Construction Administration, Changzhou 213000, China; 3.School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
关键词:
水溶性稳定剂;  砂土;  渗透系数;  保水特性;  改良机理
Keywords:
water-soluble stabilizer;  sandy soil;  permeability coefficient;  water retention properties;  improvement mechanism
分类号:
TV443
文献标志码:
B
摘要:
针对砂土结构松散、易冲刷等特性,采用水溶性稳定剂对其改良。通过常水头、变水头渗透试验和保水性试验,研究了不同稳定剂含量改良后砂土的渗透特性和保水特性,并根据扫描电镜对其改良机理进行了分析。结果表明,稳定剂的含量和试样密度对改良砂土的水理特性具有重要影响; 在常水头渗透试验中,改良砂土的初始出水时间随稳定剂含量和密度的增加逐渐减小,且当稳定剂含量达到3%后,改良砂土不再有水流出; 改良砂土的渗透系数随试样密度的增加显著减小,且与稳定剂含量几乎保持指数减小关系,当稳定剂含量达到3%后,渗透系数趋近于0; 稳定剂改良后的砂土具有良好的保水特性,保水性能随稳定剂含量的增加保持增加趋势。随着水分的挥发,稳定剂在砂土颗粒之间形成网状膜,能够填充砂土内部孔隙,使得松散的砂土颗粒连接成为一体,有效提高砂土的抗渗性能,且在砂土表层能够形成固化层,有效减小土体内部水分流失,达到良好的保水效果。
Abstract:
In view of the property of loose structure and easy erosion of sandy soils, water-soluble stabilizer was used to improve it. The permeability and water retention properties of sandy soils modified by different stabilizer contents were studied through constant head, variable head permeability test and water retention test, and the improvement mechanism was analyzed by SEM. The results showed that the content of stabilizer and the sample density could have important influence on the water properties of modified sandy soil. In the constant head permeability test, the initial effluent time of modified sandy soil gradually decreased with the increase of stabilizer content and density. When the stabilizer content reached 3%, the modified sandy soil would no longer flow out. The permeability coefficient of the modified sandy soil decreased significantly with the increase of sample density, and almost maintained an exponential decrease relation with the stabilizer content. When the stabilizer content reached 3%, the permeability coefficient approached 0. Sandy soil modified by stabilizer had good water retention property, which increasing with the increase of stabilizer content. As water evaporated, the stabilizer formed a network film between the sand particles, which could fill the internal pores of the sand and connect the loose sand particles into one, effectively improving the impermeability of the sand, and forming a solidified layer on the surface of the sand, effectively reducing the internal water loss of the soil and achieving a good water retention effect.

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备注/Memo

备注/Memo:
收稿日期:2020-10-19
基金项目:江苏省水利科技项目(2017010)
作者简介:邵勇(1979— ),男,高级工程师,博士,研究方向为水工结构。Email:46875561@qq.com
更新日期/Last Update: 2021-04-20