KCl溶液对安康膨胀土膨胀性影响的多因素耦合分析
摘要:进行了不同浓度KCl溶液改良安康膨胀土的自由膨胀率试验，分析了不同质量分数的KCl溶液对安康膨胀土膨胀性的影响，进一步对安康膨胀土的膨胀机理作深入的讨论。在自由膨胀率试验中，以加入质量分数为3%、6%、9%及12%KCl溶液的改性膨胀土为研究对象，结果表明：相比于素膨胀土，各浓度的KCl溶液均可以使膨胀土的自由膨胀率降低，土样的自由膨胀率随KCl浓度增大加呈现先降低后升高再降低的波动下降趋势。在3%、6%、9%的添加浓度下，变成弱膨胀潜势的膨胀土，在12%的添加浓度下自由膨胀率达到最低值33%，变为非膨胀土。根据试验结果，从晶层膨胀作用及对其抑制作用、孔隙间盐溶液浓度的变化对安康膨胀土膨胀特性的影响等方面出发，对形成膨胀率波动趋势的四种作用进行了研究，重点分析不同浓度区间内各种作用的主次关系，最后结合晶层扩张理论和渗透理论，提出了膨胀土的膨胀潜势影响关系表达式，并详细讨论了影响膨胀潜势的分项系数，各分项系数在不同浓度区间内的影响作用不同。该表达式可以合理解释安康膨胀土自由膨胀率呈现先下降后上升再下降的波动趋势变化，是由晶层膨胀作用及其抑制作用、孔隙间盐溶液浓度的变化等四种作用之间的相对强弱决定的，从而弥补了晶层扩张理论的不足。
Abstract:The free swelling ratio of modified Ankang expansive soil with KCl solution at different concentrations was tested;the effect of KCl solution with different mass fractions on the expansive soil was analyzed;and the swelling mechanism of Ankang expansive soil was further discussed.The free swelling ratio test of the modified expansive soil was conducted with different mass fractions of KCl solution,being 3%,6%,9%and 12%,respectively.The results show that comparing with the plain expansive soil,the KCl solution would reduce the free swelling ratio of theexpansive soil.With theincrease of KCl concentration,the free swelling ratio of the soil samples decreased at first,then increased and finally decreased again,showing an overall fluctuant decreasing tendency.Influenced by KCl solution with concentration of 3%,6%,and 9%,the free swelling ratio of expansive soil decreased and became weak expansion potential soil.The free swelling ratio of soil samples reached the lowest value being 33%due to theimpact of 12%KCl solution,and the expansive soil became non-expansive soil.According to the results,and focusing on the effect of the crystal layer expansion and its inhibition,as well as the concentration change of the salt solution between the pores on the expansion characteristics of the expansive soil,four effects on the fluctuation of the swelling ratio were studied,and the primary and secondary relationships of various effects in different concentration intervals were analyzed emphatically.Based on the theory of crystal layer expansion and the theory of permeability,the expression of the expansion potential of expansive soil was proposed.The partial coefficient which affects the expan-sion potential was discussed in details,showing that the effects of each partial coefficient in different concentration intervals are different.This expression could reasonably explain the change of the free swelling ratio of the expansive soil,which firstly decreased,then increased and finally decreased.It is determined that the fluctuant tendency is caused by the relative strength of the crystal layer expansion and its inhibition,as well as the concentration change of the salt solution between the pores.This theory is expected to make up the deficiency of the theory of the crystal layer expansion.
中文标题：
KCl溶液对安康膨胀土膨胀性影响的多因素耦合分析
Multi-factor Coupling Analysis of the Influence of KCl Solution on the Expansion of Ankang Expansive Soil
作者：
翟志刚,雷胜友,,袁文治,李思雨,陈雨菲,柳明宇
Zhai Zhigang,Lei Shengyou,,Yuan Wenzhi,Li Siyu,Chen Yufei,Liu Mingyu
作者简介:翟志刚，男，1997年生，呼和浩特人，在读本科生，主要从事岩土与隧道工程方向的研究。E-mail：1178470782@qq.com通讯作者:雷胜友，男，1965年生，陕西澄城人，博士，教授，博士生导师，研究方向为特殊土的改良、高速铁路地基处理。E-mail：1436885380@qq.com
通讯地址：
长安大学公路学院, 陕西西安 710064
SchoolofHighway,Chang'anUniversity,Xi'an710064,Shaanxi,China
中图分类号:TU411
doi:10.3969/j.issn.1007-2993.2019.05.002
出版物：岩土工程技术
收稿日期:2019-03-18
网络出版日期:2021-07-06
关键词:膨胀土,膨胀特性,KCl溶液,自由膨胀率,耦合
Key words:expansive soil,expansion characteristic,KCl solution,free swelling ratio,coupling
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基金项目：
基金项目: 大学生创新创业训练计划(201810710010；S201910710035；S201910710025)
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