石灰粉煤灰联合固化石油污染滨海盐渍土的力学特性
发布时间：2018-10-19 13:57
【摘要】：石油污染土物理力学性质较差,改善其强度是实现工程再利用的前提。以滨海地区石油污染盐渍土为研究对象,采用石灰粉煤灰进行固化处置,借助无侧限抗压强度试验,量化固化效果及各个因素的影响程度。结果表明:石灰粉煤灰联合固化可使石油污染土的抗压强度大幅提高,12%石灰+20%粉煤灰固化石油污染土的强度满足《公路路基设计规范》(JTG D30—2015)中关于二级公路上下路堤及地基土置换的抗压强度要求,且控制石油污染水平8%以内时,可满足高速公路、一级公路上下路堤中抗压强度指标要求;固化石油污染土的应力 应变曲线由直线加载、非线性上升及下降3个阶段组成,破坏模式呈应变软化型,随石油污染水平加剧,塑性变形部分增强;固化土的强度随石油污染水平加剧而下降,石油污染减缓固化反应速率,弱化石灰 粉煤灰 土颗粒间固化作用;对于石油污染水平为0~12%的盐渍土,适宜耦合条件为:12%石灰+22%粉煤灰,养护龄期28 d。
[Abstract]:The physical and mechanical properties of petroleum contaminated soil are poor, and the improvement of its strength is the premise of engineering reuse. Taking the petroleum contaminated saline soil in coastal area as the research object, lime fly ash was used for curing treatment, and the curing effect and the influence degree of each factor were quantified by the unconfined compressive strength test. The results show that the compressive strength of petroleum contaminated soil can be greatly improved by combined solidification of lime and fly ash, and the strength of 12% lime 20% fly ash solidified petroleum contaminated soil can meet the second grade highway in the Design Code for Highway subgrade (JTG D30-2015). Requirements of compressive strength for replacement of upper and lower embankments and foundation soil, When the oil pollution level is less than 8%, it can meet the requirement of compressive strength index in expressway and first grade highway, and the stress-strain curve of solidified petroleum contaminated soil consists of three stages: linear loading, nonlinear rising and decreasing. The failure mode is strain softening type, the plastic deformation is partly enhanced with the increase of oil pollution level, the strength of solidified soil decreases with the increase of oil pollution level, and the solidification reaction rate is slowed down by oil pollution. For salinized soil with 0 ~ 12% oil pollution, the suitable coupling conditions are: 12% lime 22% fly ash, 28 days curing age.
【作者单位】： 河北工业大学土木工程学院;河北工业大学河北省土木工程技术研究中心;河北工业大学能源与环境工程学院;
【基金】：国家自然科学基金资助项目(41272335,51409079) 河北省自然科学基金资助项目(E2014202104)~~
【分类号】：TU448
本文编号：2281338
[Abstract]:The physical and mechanical properties of petroleum contaminated soil are poor, and the improvement of its strength is the premise of engineering reuse. Taking the petroleum contaminated saline soil in coastal area as the research object, lime fly ash was used for curing treatment, and the curing effect and the influence degree of each factor were quantified by the unconfined compressive strength test. The results show that the compressive strength of petroleum contaminated soil can be greatly improved by combined solidification of lime and fly ash, and the strength of 12% lime 20% fly ash solidified petroleum contaminated soil can meet the second grade highway in the Design Code for Highway subgrade (JTG D30-2015). Requirements of compressive strength for replacement of upper and lower embankments and foundation soil, When the oil pollution level is less than 8%, it can meet the requirement of compressive strength index in expressway and first grade highway, and the stress-strain curve of solidified petroleum contaminated soil consists of three stages: linear loading, nonlinear rising and decreasing. The failure mode is strain softening type, the plastic deformation is partly enhanced with the increase of oil pollution level, the strength of solidified soil decreases with the increase of oil pollution level, and the solidification reaction rate is slowed down by oil pollution. For salinized soil with 0 ~ 12% oil pollution, the suitable coupling conditions are: 12% lime 22% fly ash, 28 days curing age.
【作者单位】： 河北工业大学土木工程学院;河北工业大学河北省土木工程技术研究中心;河北工业大学能源与环境工程学院;
【基金】：国家自然科学基金资助项目(41272335,51409079) 河北省自然科学基金资助项目(E2014202104)~~
【分类号】：TU448
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