|本期目录/Table of Contents|

[1]王章琼,白俊龙,叶张颜.过量石灰对细粒土改良效果“负效应”机理的宏-细观试验研究[J].武汉工程大学学报,2020,42(03):316-320.[doi:10.19843/j.cnki.CN42-1779/TQ.201901015]
 WANG Zhangqiong,BAI Junlong,YE Zhangyan.Mechanism of Negative Effect of Excessive Lime Addition on Improvement of Fine Grained Soil by Macro-Microscopic Test[J].Journal of Wuhan Institute of Technology,2020,42(03):316-320.[doi:10.19843/j.cnki.CN42-1779/TQ.201901015]
点击复制

过量石灰对细粒土改良效果“负效应”机理的宏-细观试验研究(/HTML)
分享到:

《武汉工程大学学报》[ISSN:1674-2869/CN:42-1779/TQ]

卷:
42
期数:
2020年03期
页码:
316-320
栏目:
资源与环境工程
出版日期:
2023-03-14

文章信息/Info

Title:
Mechanism of Negative Effect of Excessive Lime Addition on Improvement of Fine Grained Soil by Macro-Microscopic Test
文章编号:
1674 - 2869(2020)03 - 0316 - 05
作者:
王章琼1白俊龙1叶张颜2
1. 武汉工程大学土木工程与建筑学院,湖北 武汉 430074;2. 恩施市公路管理局,湖北 恩施 445000
Author(s):
WANG Zhangqiong1BAI Junlong1YE Zhangyan2
1. School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430074, China;2. Enshi Municipality Highway Bureau, Enshi 445000, China
关键词:
土质改良石灰微观结构细粒土扫描电子显微镜
Keywords:
soil improvement lime microstructure fine grained soil scanning electron microscope
分类号:
TU411.91
DOI:
10.19843/j.cnki.CN42-1779/TQ.201901015
文献标志码:
A
摘要:
石灰是常用的特殊土改良材料,但掺量过大时反而导致改良土力学性质的劣化。为研究石灰掺量对细粒土改良效果“负效应”的产生机理,制备石灰掺杂质量分数为0%、3%、5%、7%、9%、11%的改良红砂岩残积土试样,分别养护28、60 d后进行无侧限抗压试验、扫描电子显微镜试验,获得无侧限抗压强度与石灰掺量和养护龄期的关系,以及不同石灰掺量改良土试样的微观结构特征。结果表明:对于本文试验中红砂岩残积土,无侧限抗压强度对应的最优石灰掺量为11%;石灰掺加质量分数不高于11%时,石灰充填在土颗粒孔隙中,起胶结土颗粒的作用,无侧限抗压强度提高;石灰掺加质量分数达到13%时,充填的石灰厚度过大,土颗粒“悬浮”在石灰之中,对承受轴向荷载的贡献大大减弱。
Abstract:
Lime is commonly used as the material to improve special soil,however,excessive amount of lime may deteriorate mechanical properties of improved soil. To study the mechanism of the effect of lime amount on the improvement of fine grained soil,the modified residual soil of red sandstone samples with lime mass fractions of 0,3%,5%,7%,9% and 11% were prepared. The samples were tested by the unconfined compression and scanning electron microscopy respectively after conservation of 28 d or 60 d. The relationship between unconfined compressive strength,lime amount and curing age,as well as the microstructure characteristics of modified soil samples were obtained. The result shows that the maximum unconfined compressive strength is achieved with 11% of lime amount,and lime is found to be filled in the pores of soil particles and cements the soil particles with less than 11% of lime amount,which increases the unconfined compressive strength. However,the filling lime is too thick with 13% of lime amount,thus the soil particles are "suspended" in lime,reducing axial load of soil particles.

参考文献/References:

[1] 宋金华,林园皓. 冻融循环条件下石灰改良土路基回弹模量研究[J]. 重庆交通大学学报(自然科学版),2019,38(12):76-80. [2] CHENG Y Z,WANG S,LI J, et al. Engineering and mineralogical properties of stabilized expansive soil compositing lime and natural pozzolans [J]. Construction and Building Materials,2018,187:1031-1038. [3] 李自立,陈志波,胡屏,等. 粉煤灰与石灰改良花岗岩残积土压缩特性研究[J]. 水利与建筑工程学报,2019,17(1):82-86. [4] 朱墨沙,璩继立. 建筑垃圾碎末和石灰粉对上海黏土抗压强度的影响[J]. 水资源与水工程学报,2018,29(5):229-235. [5] MANASSEH J,OLUFEMI A I. Effect of lime on some geotechnical properties of igumale shale [J]. Electronic Journal of Geotechnical Engineering,2008,13(6):1-12. [6] 阮波,彭学先,马超,等. 玻璃纤维加筋石灰土无侧限抗压强度试验研究[J]. 铁道科学与工程学报,2018,15(9):2246-2251. [7] 王章琼,高云,沈雷,等. 石灰改性红砂岩残积土工程性质试验研究[J]. 工程地质学报,2018,26(2):416-421. [8] 符策岭,曾召田,莫红艳,等. 石灰改良膨胀土的工程特性试验研究[J]. 广西大学学报(自然科学版),2019,44(2):524-533. [9] 王勇,李国芬,黄凯健,等. 水泥/石灰对滨海盐渍路基土性能的影响[J]. 南京林业大学学报(自然科学版),2014,38(5):165-169. [10] 李儒天. 不同改性材料改良膨胀土无侧限抗压强度的比较试验研究[J]. 三峡大学学报(自然科学版),2014,36(3):56-60. [11] 庄心善,余晓彦. 石灰-玄武岩纤维改性膨胀土强度特性的试验研究[J]. 土木工程学报,2015,48(增刊1):166-170. [12] 高晓波,阮波,田晓涛,等. 贵州地区石灰改良膨胀土无侧限抗压强度的试验研究[J]. 铁道科学与工程学报,2014,11(6):68-71. [13] NUNES C, M?COV? P, FRANKEOV ? D, et al. Influence of linseed oil on the microstructure and composition of lime and lime-metakaolin pastes after a long curing time[J]. Construction and Building Materials,2018,198:787-796. [14] BOZBEY I,GARAISAYEV S. Effects of pulverization quality on lime stabilization of an expansive clay[J]. Environment and Earth Science,2010,60(6):1137-1151. [15] 章敏. 钙矾石形成引起石灰改良土膨胀研究[J]. 铁道建筑,2019,59(7):102-104,108. [16] 钟园,丁峰,廖奇麟,等. 恩施红层砂岩细粒土工程特性对比的试验研究[J]. 武汉工程大学学报,2017,39(1):64-68.

相似文献/References:

备注/Memo

备注/Memo:
收稿日期:2019-01-16基金项目:湖北省教育厅科技计划项目(B2017058)作者简介:王章琼,博士,副教授。E-mail: wzqcug@163.com引文格式:王章琼,白俊龙,叶张颜. 过量石灰对细粒土改良效果“负效应”机理的宏-细观试验研究[J]. 武汉工程大学学报,2020,42(3):316-320.
更新日期/Last Update: 2020-07-09