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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

37卷

期数:

2020年05期

页码:

182-192

栏目:

出版日期:

2020-09-30

文章信息/Info

Title:

Diffusion Characteristics of Grouting Slurry in Sandy Stratum

文章编号:

1673-2049(2020)05-0182-11

作者:

周 峰¹,许 勇¹,朱 锐²,宋 著¹,翟德志³,牟育敏¹

1. 南京工业大学 交通运输工程学院,江苏 南京 210009; 2. 南京水利科学研究院 岩土工程研究所,江苏 南京 210029; 3. 中国建筑西南勘察设计研究院有限公司,四川 成都 610052

Author(s):

ZHOU Feng¹, XU Yong¹, ZHU Rui², SONG Zhu¹, ZHAI De-zhi³, MOU Yu-min¹

1. School of Transportation Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China; 2. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, Jiangsu, China; 3. China Southwest Geotechnical Investigation &

关键词:

渗透注浆;  线性回归;  浆液扩散半径;  强度

Keywords:

permeation grouting;  linear regression;  slurry diffusion radius;  strength

分类号:

TU473.1

DOI:

10.19815/j.jace.2019.11083

文献标志码:

A

摘要:

对南京地区河砂采用筛孔分别为5,2,0.5,0.2 mm 的筛网筛分后,分为不同粒径的砂土,以渗透系数为控制指标,根据试验需要对所用河砂进行配比,模拟出4种砂砾土层。通过对自行研制的一种渗透注浆装置进行室内模拟注浆试验,研究了4种不同颗粒级配的砂样在不同注浆量、水灰比、注浆压力等影响因素下浆液的扩散特性,并在此基础上进行多元线性回归分析。结果表明:浆液扩散半径主要影响因素的主次顺序为注浆压力、渗透系数、水灰比; 注浆量主要影响因素的顺序为注浆压力、渗透系数、水灰比; 结核体强度主要影响因素的顺序为水灰比、渗透系数、注浆压力; 结合试验结果拟合得到了浆液扩散半径、注浆量、结核体强度与渗透系数、浆液水灰比、注浆压力之间的定量关系式; 砂性地层中的浆液扩散半径存在有效半径,为初始半径的75%～80%; 对于在砂性地层中的浆液扩散行为,具有多种浆液扩散模式并存的可能; 所得结论可供类似工程借鉴与参考。

Abstract:

The river sand in Nanjing area was divided into sand with different particle sizes after sieving through the screens with 5, 2, 0.5 and 0.2 mm mesh holes, respectively. According to the needs of the test and taking the permeability coefficient as the control index, the river sand used was proportioned to simulate four kinds of gravel soil layers. The indoor simulation grouting test was carried outthrough a self-developed infiltration grouting device, and the diffusion characteristics of slurry under the influence factors of different grouting amounts, water cement ratios and grouting pressures of four kinds of sand samples with different particle grading were studied. On this basis, the multiple linear regression analysis was carried out. The results show that the main influencing factors of the slurry diffusion radius are grouting pressure, permeability coefficient and water cement ratio; the main influencing factors of grouting volume are grouting pressure, permeability coefficient and water cement ratio; the main influencing factors of the strength of the nodule are water cement ratio, permeability coefficient and grouting pressure; the slurry diffusion radius, grouting volume and grouting pressure are obtained by combining the experimental results. The quantitative relationship between core strength and permeability coefficient, water cement ratio of slurry and grouting pressure is obtained; the effective radius of slurry diffusion radius in sand formation is about 75%-80% of the initial radius; the slurry diffusion behavior in sand formation has the possibility of coexistence of multiple slurry diffusion modes. The test results can be used for reference in similar projects.

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相似文献/References:

[1]郑传峰,王磊,焦晓磊.淤泥质软粘土剪切蠕变方程及流变参数研究[J].建筑科学与工程学报,2011,28(03):101.
　ZHENG Chuan-feng,WANG Lei,JIAO Xiao-lei.Research on Shear Creep Equation and Rheological Parameters of Sludge Soft Clay[J].Journal of Architecture and Civil Engineering,2011,28(05):101.

备注/Memo

备注/Memo:

收稿日期:2019-11-21
基金项目:国家自然科学基金项目(51778287)
作者简介:周 峰(1979-),男,江苏阜宁人,教授,工学博士,E-mail: zhoufeng@njtech.edu.cn。
通信作者:许 勇(1994-),男,江苏南通人,工学硕士研究生,E-mail:xuyong1301@126.com。

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更新日期/Last Update: 2020-10-15