干湿循环作用下改良铁尾矿强度特性试验研究
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摘要
为研究道路工程中固化剂改良铁尾矿的耐干湿循环能力,文章以无侧限抗压强度为评价指标,用水泥、土凝岩改良铁尾矿,经历干湿循环后测其强度,对单因素试验、均匀设计试验结果进行分析。结果表明:在干湿循环作用下,两种固化剂改良铁尾矿强度均随循环次数增加而衰减,经过5次循环后强度衰减变慢,土凝岩改良铁尾矿耐干湿循环能力较优;两种固化剂改良铁尾矿强度随着养护龄期的增加而增长,养护14d后增长幅度明显降低,强度逐渐趋于稳定;增加固化剂掺量及提高压实度均能使改良铁尾矿强度明显提升,且对土凝岩改良铁尾矿强度提升幅度较高;养护龄期、固化剂掺量、压实度对两种固化剂改良铁尾矿强度影响显著,而干湿循环次数对强度影响不显著。
In order to study the drying-wetting cycles resistance of the stabilized iron tailings by curing agents in road engineering,in this paper,the unconfined compressive strength is used as the evaluation index,stabilizing iron tailings with cement and soil stabilizer.The strength after experiencing dry and wet cycles are tested,and single factor test and uniform design test results are analyzed.The results show that under the action of drying-wetting cycles,the strength of the stabilized iron tailings of the two types of curing agents attenuate with the increase of the number of cycles.After five cycles,the strength decays slowly,and the soil stabilizer stabilized iron tailings has better resistance to dry-wet cycles.The strength of two curing agents stabilized iron tailings improve with the increase of curing time.After 14 days of curing,the increase rate is significantly reduced,and the strength becomes stable gradually.Increasing the amount of curing agent and increasing the degree of compaction can improve the strength of the stabilize iron tailings,and the improvement of the strength of the improved soil stabilizer stabilize iron tailings is higher.The curing time,the amount of curing agent and the degree of compaction have significant effects on the strength of the two curing agents stabilized iron tailings,while the number of dry and wet cycles has no significant effect on the strength.
In order to study the drying-wetting cycles resistance of the stabilized iron tailings by curing agents in road engineering,in this paper,the unconfined compressive strength is used as the evaluation index,stabilizing iron tailings with cement and soil stabilizer.The strength after experiencing dry and wet cycles are tested,and single factor test and uniform design test results are analyzed.The results show that under the action of drying-wetting cycles,the strength of the stabilized iron tailings of the two types of curing agents attenuate with the increase of the number of cycles.After five cycles,the strength decays slowly,and the soil stabilizer stabilized iron tailings has better resistance to dry-wet cycles.The strength of two curing agents stabilized iron tailings improve with the increase of curing time.After 14 days of curing,the increase rate is significantly reduced,and the strength becomes stable gradually.Increasing the amount of curing agent and increasing the degree of compaction can improve the strength of the stabilize iron tailings,and the improvement of the strength of the improved soil stabilizer stabilize iron tailings is higher.The curing time,the amount of curing agent and the degree of compaction have significant effects on the strength of the two curing agents stabilized iron tailings,while the number of dry and wet cycles has no significant effect on the strength.
引文
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[15]孙吉书,陈朝霞,肖田,等.石灰粉煤灰稳定铁尾矿碎石的路用性能研究[J].武汉理工大学学报,2012,34(3):59-62.
[16]刘晶磊,王一峰,王奥运,等.土壤固化剂改良铁尾矿路用性能研究[J].公路,2018,63(4):24-29.
[2]刘文化,杨庆,唐小微,等.交通荷载作用下非饱和土的动力特性试验研究[J].防灾减灾工程学报,2015,35(2):263-269.
[3]A S Alhomoud,A A Basma,A I H Malkawi,et al.Cyclic Swelling Behavior of Clays[J].Journal of Geotechnical Engineering,1995,121(7):562-565.
[4]H Nowamooz,E Jahangir,F Masrouri.Volume Change Behaviour of a Swelling Soil Compacted at Different Initial States[J].Engineering Geology,2013,153(2):25-34.
[5]赵明龙,王建华,梁爱华.干湿循环对水泥改良土疲劳强度影响的试验研究[J].中国铁道科学,2005,26(2):25-28.
[6]刘义虎,杨果林,黄向京.干湿循环作用下水对膨胀土路基破坏机理的试验研究[J].中外公路,2006,(3):30-35.
[7]吕海波,曾召田,赵艳林,等.膨胀土强度干湿循环试验研究[J].岩土力学,2009,30(12):3797-3802.
[8]A Kampala,S Horpibulsuk,N Prongmanee,et al.Influence of Wet-dry Cycles on Compressive Strength of Calcium Carbide Residue-fly Ash Stabilized Clay[J].Journal of Materials in Civil Engineering,2014,26(4):633-643.
[9]王天,翁兴中,张俊,等.干湿循环条件下复合固化砂土抗压强度试验研究[J].铁道科学与工程学报,2017,14(4):721-729.
[10]L M Zanko,H B Niles,J A Oreskovich.Mineralogical and Microscopic Evaluation of Coarse Taconite Tailings from Minnesota Taconite Operations[J].Regulatory Toxicology and Pharmacology,2008,52(1):S51-S65.
[11]R Velasquez,M Turos,K H Moon,et al.Using Recycled Taconite as Alternative Aggregate in Asphalt Pavements[J].Construction and Building Materials,2009,(23):3070-3078.
[12]王晶.铁尾矿在国内外道路工程中的应用[J].环境与发展,2014,26(7):51-55,100.
[13]荣海,汪建,周志华,等.铁尾矿在公路工程中的应用[J].矿业工程,2007,(5):52-54.
[14]王琰.无机结合料稳定铁尾矿砂的疲劳及冻融循环特性的试验研究[D].大连理工大学,2009.
[15]孙吉书,陈朝霞,肖田,等.石灰粉煤灰稳定铁尾矿碎石的路用性能研究[J].武汉理工大学学报,2012,34(3):59-62.
[16]刘晶磊,王一峰,王奥运,等.土壤固化剂改良铁尾矿路用性能研究[J].公路,2018,63(4):24-29.