石灰改性石油污染盐渍土的力学特性  

Strength and deformation characteristics of oil-contaminated inshore saline soil solidified with lime

作　　者：佟利辉 李敏 李达 王宸 TONG Lihui;LI Min;LI Da;WANG Chen(Hebei Construction Group Corporation Limited,Baoding,Hebei 071400,China;School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Hebei Research Center of Civil Engineering Technology,Tianjin 300401,China)

机构地区：[1]河北建设集团股份有限公司,河北保定071400 [2]河北工业大学土木与交通学院,天津300401 [3]河北省土木工程技术研究中心,天津300401

出　　处：《河北工业大学学报》2021年第4期87-94,共8页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(E2018202274);国家自然科学基金(51409079);天津市自然科学基金(17JCZDJC39200)。

摘　　要：以实现石油污染土的工程再利用为目的,借助无侧限抗压强度试验,探索石灰改性石油污染滨海盐渍土的强度分布规律。结果表明:石灰改性有助于提高石油污染土的抗压强度和抗变形性能,10%石灰改性污染土的无侧限抗压强度最小值为764 kPa,能够满足《公路路面基层施工技术规范》(TJJ034—2000)中二级和二级以下公路底基层强度标准(500 kPa)。石灰改性污染土的峰值应变平均值为2.04%,小于石油污染土的峰值应变(3%);石灰改性石油污染土的抗压强度随含油量的增加先增大再稳定后减小,随石灰掺量及养护龄期的增加而增大;经石灰改性处置,污染土的破坏模式由塑性大变形破坏转为脆性开裂破坏,且随养护龄期、石灰掺量及含油量的增加,土样裂缝宽度增大且边缘更加不规则;含油率对改性反应进程影响较小,且存在临界石油含量作用点,对于0~20%石油污染盐渍土,适宜石灰掺量为10%,养护龄期依旧为21 d。In order to achieve the engineering reuse of oil-contaminated soil,an unconfined compression strength test was carried out to study the strength distribution of oil contaminated saline soil solidified with lime.Results indicated that:(i)Compressive strength and anti-deformation behavior of oil contaminated soil can be effectively improved by lime solidification,and the minimum value was 764 kPa as lime content of 10%.It can meet the strength standard level of two and below grade road base(500 kPa)in the“Technical Specifications for Construction of Highway Pavement Base”(TJJ034—2000).The average value of peak strain was less than oil-contaminated soil,it is 2.04%as lime content of 10%.(ii)Compressive strength of oil-contaminated soil solidified with lime increase firstly,then remain stable and decrease with the increase of oil content.The effect of lime content and curing days increase continually.(iii)Failure for oil-con⁃taminated saline soil solidified with lime change from plastic mode to brittle mode.Besides that,the width and irregulari⁃ty cracks are intensified with increase of curing days,lime content and oil content.(iv)There is little effect of oil contami⁃nation on solidification reaction process,and a critical point of oil contamination exists.The optimum of lime content and curing days for the soil with oil content of 0-20%is 10%and 21 respectively.

关 键 词：石油污染土 石灰改性 无侧限抗压强度 抗变形特性 滨海盐渍土 

分 类 号：TU443[建筑科学—岩土工程]