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[1]田 威,张旭东,贾 能,等.石英粉对抗疏力固化剂改良黄土力学性能的影响[J].建筑科学与工程学报,2021,38(02):60-68.[doi:10.19815/j.jace.2020.07087]
　TIAN Wei,ZHANG Xu-dong,JIA Neng,et al.Influence of Quartz on Mechanical Property of Modified Loess with Consolid System[J].Journal of Architecture and Civil Engineering,2021,38(02):60-68.[doi:10.19815/j.jace.2020.07087]
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石英粉对抗疏力固化剂改良黄土力学性能的影响(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
38卷
期数:
2021年02期
页码:
60-68
栏目:
出版日期:
2021-03-25

文章信息/Info

Title:
Influence of Quartz on Mechanical Property of Modified Loess with Consolid System
文章编号:
1673-2049(2021)02-0060-09
作者:
田 威1,张旭东1,贾 能1,李 腾1,许尚杰2
1. 长安大学 建筑工程学院,陕西 西安 710061; 2. 日喀则市水利局,西藏 日喀则 875000
Author(s):
TIAN Wei1, ZHANG Xu-dong1, JIA Neng1, LI Teng1, XU Shang-jie2
1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Xigaze Municipal Water Resources Bureau, Xigaze 875000, Xizang, China
关键词:
岩土工程;  抗疏力固化剂;  改良黄土;  单轴抗压强度;  石英粉
Keywords:
geotechnical engineering;  consolid system;  improved loess;  uniaxial compressive strength;  quartz powder
分类号:
TU411.3
DOI:
10.19815/j.jace.2020.07087
文献标志码:
A
摘要:
为了有效提高现有黄土的强度并解决改良黄土成本过高的问题,基于抗疏力固化剂改良黄土的性能及固化机理,首次提出在抗疏力固化剂改良黄土中掺入不同细度及不同掺量的石英粉(4, 200, 1 000目的造景废砂)进行改性增效。通过单轴抗压试验,在分析石英粉改良抗疏力固化剂改良黄土的最优配比基础上,讨论石英粉细度及掺量对改良黄土抗压强度、应力-应变曲线、破坏形态以及内摩擦角的影响,并结合扫描电镜探讨改良机理,进一步利用摩尔库仑强度理论分析双掺条件下黏聚力和内摩擦角的变化规律。研究结果表明:单掺石英粉和抗疏力固化剂都可以在一定程度上提高黄土强度,在2%掺量(质量分数)抗疏力固化剂改良黄土中掺入10%的200目石英粉可以显著提高黄土的抗压强度,通过扫描电镜试验观察得出抗疏力固化剂主要通过包裹黏聚200目石英粉形成的胶结体黏聚黄土中原有的骨架颗粒,以达到提高黄土强度的目的,且抗疏力固化剂和石英粉的掺入会同时影响改良黄土的刚度和变形性能; 不同粒径的石英粉对黄土的内摩擦角也有不同程度的影响。
Abstract:
In order to further improve the strength of the existing loess and solve the problem of high cost of loess improvement, based on the performance of modified loess with consolid system and its improvement mechanism, it was proposed for the first time that quartz powder with different fineness and content(the quartz powder used in the experiment comes from the waste sand of 40, 200 and 1 000 mesh)was added to improve the consolid system to improve the performance. Through uniaxial compression test, the optimal ratio of quartz powder in the modified loess with consolid system was determined, and the influences of the fineness and content of quartz powder on the compressive strength, stress-strain curve, failure pattern and internal friction angle of the improved loess were discussed. Combined with scanning electron microscope, the improvement mechanism was discussed, and the Mohr-Coulomb strength theory was further used to analyze the change rule of cohesive force and internal friction angle under the condition of double mixing. The study results show that the strength of loess can be improved by adding quartz powder and consolid system alone, and the compressive strength of loess can be significantly improved by adding 10%(mass fraction)and 200 mesh of quartz powder in the process of modified loess with 2% consolid system. Through scanning electron microscope test, it is concluded that the consolid system mainly adopts the skeleton particles in the original part of the cohesive loess formed by agglomerating 200 mesh of quartz powder to improve the loess strength. The addition of consolid system and quartz powder also affects the stiffness and deformation performance of the modified loess. In addition, quartz powder with different particle size also has different effects on the internal friction angle of loess.

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备注/Memo

备注/Memo:
收稿日期:2020-07-30
基金项目:国家自然科学基金项目(51579013); 中央高校基本科研业务费专项资金项目(300102289303,300102280106)
作者简介:田 威(1981-),男,陕西西安人,教授,博士研究生导师,工学博士,E-mail:tianwei@chd.edu.cn。
通信作者:张旭东(1995-),男,工学硕士研究生,E-mail:1006819192@qq.com。
更新日期/Last Update: 2021-03-20