【摘要】：石油污染土物理力學(xué)性質(zhì)較差,改善其強(qiáng)度是實(shí)現(xiàn)工程再利用的前提。以濱海地區(qū)石油污染鹽漬土為研究對(duì)象,采用石灰粉煤灰進(jìn)行固化處置,借助無(wú)側(cè)限抗壓強(qiáng)度試驗(yàn),量化固化效果及各個(gè)因素的影響程度。結(jié)果表明:石灰粉煤灰聯(lián)合固化可使石油污染土的抗壓強(qiáng)度大幅提高,12%石灰+20%粉煤灰固化石油污染土的強(qiáng)度滿(mǎn)足《公路路基設(shè)計(jì)規(guī)范》(JTG D30—2015)中關(guān)于二級(jí)公路上下路堤及地基土置換的抗壓強(qiáng)度要求,且控制石油污染水平8%以?xún)?nèi)時(shí),可滿(mǎn)足高速公路、一級(jí)公路上下路堤中抗壓強(qiáng)度指標(biāo)要求;固化石油污染土的應(yīng)力 應(yīng)變曲線(xiàn)由直線(xiàn)加載、非線(xiàn)性上升及下降3個(gè)階段組成,破壞模式呈應(yīng)變軟化型,隨石油污染水平加劇,塑性變形部分增強(qiáng);固化土的強(qiáng)度隨石油污染水平加劇而下降,石油污染減緩固化反應(yīng)速率,弱化石灰 粉煤灰 土顆粒間固化作用;對(duì)于石油污染水平為0~12%的鹽漬土,適宜耦合條件為:12%石灰+22%粉煤灰,養(yǎng)護(hù)齡期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.
【作者單位】： 河北工業(yè)大學(xué)土木工程學(xué)院;河北工業(yè)大學(xué)河北省土木工程技術(shù)研究中心;河北工業(yè)大學(xué)能源與環(huán)境工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(41272335,51409079) 河北省自然科學(xué)基金資助項(xiàng)目(E2014202104)~~
【分類(lèi)號(hào)】：TU448

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