康琦 董晓明 任国杰

作者简介:康琦（1980玻，男，回族，安徽太和人，高级工程师，主要从事桥梁结构理论方面研究。E瞞ail:381657000@qq.comDOI：10.13476/j.cnki.nsbdqk.2014.04.032

摘要：采用低速台式自动平衡离心机，对新疆奎屯部死玛依高速公路路基填料的天然盐渍土进行室内离心模拟试验，探讨了含盐量、温度及离心力对该地区硫酸盐渍土溶陷变形的影响。研究结果表明：硫酸盐渍土的溶陷系数均随着离心加速度的增加而增加，与含盐量无关；当离心力小于300 kPa时，溶陷系数最敏感；当SO42埠量为2%时，对盐渍土的溶陷变形影响最大。通过非线性回归正交分析方法对5种工况试验数据进行分析，得出不同含盐量、不同温度的f～δ拟合公式，发现当离心力为300 kPa时，温度的变化对该地区的天然盐渍土的溶陷系数影响不大。研究成果可为类似盐渍土地区进行公路工程的设计与施工提供参考。

关键词：盐渍土；溶陷系数；离心试验；含盐量；离心力；SO42埠量；温度

中图分类号：U416.1文献标志码：A文章编号：16721683（2014）04014704

Melting Characteristics of Sulfuric Saline Soil in Kuike Region of Xinjiang

KANG Qi1,2,DONG Xiao瞞ing3,REN Guo瞛ie2

(1.Changan University,Xian 710064,China;2.CCCC First Highway Consultants Co.,Ltd.,

Xi'an 710068,China;3.Civil Engineering of Ludong University,Yantai,Shandong 264025)

Abstract:The low瞫peed table automatic balance centrifugewas used to perform the laboratory centrifuge simulation on the natural saline soil of the roadbed filling of Kuitun睰elamayi highway of Xinjiang and to investigate the impacts of sanity content,temperature,and centrifugal force on the melting deformation of sulfuric saline soil,The research result showed that (1) the melting coefficient of sulfuric saline soil increases with the increasing of centrifugal acceleration speed,and is unrelated to sanity content;(2) the melting coefficient is most sensitive when the centrifugal force is less than 300 kPa;and (3) the melting deformation is biggest when SO42 content is 2%,The nonlinear regression orthogonal analysis method was used to analyze the test data under five working conditions and to obtain the f~δ fitting formula of different sanity contents and temperatures,It suggested that the variation of temperature has insignificant impacts on the melting coefficient of natural saline soil when the centrifugal force is 300 kPa,The research results can provide reference for the design and construction of highway engineering in the similar saline soil area.

Key words:saline soil;melting coefficient;centrifugal test;sanity content;centrifugal force;SO42 content;temperature

盐渍土是指地表以下l m以内易溶盐含量大于0.5%的土。我国盐渍土占地面积大、分布广、类型多，不仅涉及内陆区域的新疆、青海、甘肃、内蒙古、宁夏、黑龙江、吉林等地，而且在沿海区域的江苏、山东、河北、辽宁等地也有分布［13］。大量试验［413］表明，当地基或路基盐渍土遇水后，土体中的易溶盐溶解，土体骨架结构遭破坏，在土体自重及附加应力下易产生较大的沉陷，因此盐渍土的溶陷变形一直都是公路工程中的主要病害之一。盐渍土中易溶盐的性质、含量、温度、荷载、浸水量、土层厚度及盐渍土的类别均对溶陷变形有重要影响［1417］。……