基于三轴剪切试验的改良垃圾土抗剪特性研究
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摘要
采用三轴剪切试验方法,分析比较三种不同掺量(20%、30%、40%)的二灰(水泥与粉煤灰掺比分别为2/8和3/7)作为固化剂掺入到垃圾土后得到的改良垃圾土的力学特性.试验结果表明:随二灰掺量的增加,改良垃圾土的抗剪切强度得到大幅度的提高;随养护龄期的增加,改良垃圾土的抗剪强度同样也得到很大程度的提高;由应力-应变关系可知,二灰掺量越大,模量越高,强度也越大;水泥与粉煤灰之比越大,模量也越高,强度也越大.二灰可以显著提高垃圾土的抗剪强度,在实际工程中具有一定的应用价值.
In this paper,by means of triaxial shear test,the mechanical properties of the improved municipal solid waste with three different amount of addition(20%,30%,40%)of cement fly-ash(cement and fly-ash ratio is 2/8 and 3/7 respectively)as curing agent were compared.The triaxial shear test results show that with the increase of the amount of cement fly-ash,the shear strength of the improved municipal solid wastes has been greatly improved.With the increase of curing period,the shear strength of improved municipal solid wastes will also be greatly increased.From the stress-strain relationship,it can be concluded that the greater the amount of cement fly-ash,the greater the modulus and the strength.Besides,the greater the ratio of cement to fly-ash,the greater the modulus and the strength.The cement fly-ash can significantly improve the shear strength of municipal solid waste,which has great value in practical engineering.
In this paper,by means of triaxial shear test,the mechanical properties of the improved municipal solid waste with three different amount of addition(20%,30%,40%)of cement fly-ash(cement and fly-ash ratio is 2/8 and 3/7 respectively)as curing agent were compared.The triaxial shear test results show that with the increase of the amount of cement fly-ash,the shear strength of the improved municipal solid wastes has been greatly improved.With the increase of curing period,the shear strength of improved municipal solid wastes will also be greatly increased.From the stress-strain relationship,it can be concluded that the greater the amount of cement fly-ash,the greater the modulus and the strength.Besides,the greater the ratio of cement to fly-ash,the greater the modulus and the strength.The cement fly-ash can significantly improve the shear strength of municipal solid waste,which has great value in practical engineering.
引文
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[2]Aghajani Mir M,Taherei Ghazvinei P,Sulaiman N M N,et al.Application of TOPSIS and VIKOR improved versions in a multi criteria decision analysis to develop an optimized municipal solid waste management model[J].Journal of Environmental Management,2016,166:109~115.
[3]孟爽,刘晓莎,祝松梅.模糊综合评判在城市生活垃圾处理方法选择中的应用[J].现代企业,2016(12):21~22.
[4]赵阳.城市固体废弃物动力特性试验研究[D].大连:大连理工大学,2010.
[5]孙秀丽,孔宪京,邹德高,李志华,周太全.城市固体垃圾应力-应变-时间关系试验研究[J].岩土力学,2011,32(08):2331~2335+2364.
[6]曹秋荣,施建勇.不同应力路径对垃圾土应力-应变关系的影响[J].水利与建筑工程学报,2013,11(04):8~12.
[7]赵燕茹.城市生活垃圾填埋体的力学特性及降解沉降研究[D].重庆:重庆大学,2014.
[8]李修磊,李金凤.城市生活垃圾土变形强度特性及其应力-应变模型[J].水文地质工程地质,2016,43(05):70~75+86.
[9]Zekkos D,Bray JD,Riemer MF.Drained response of municipal solid waste in large-scale triaxial shear testing[J].Waste Manag,2012,32(10):1873~1885.
[10]Na W.Utilization of portland cement and municipal solid waste incineration fly ash for solidification/stabilization of sewage sludge[J].Nature Environment&Pollution Technology,2015,14(1):141~144.
[11]李艳霞.黄土三轴剪切变形形态试验研究[D].扬凌:西北农林科技大学,2012
[12]刘霖,武鹏飞,姜金貂.改良垃圾土强度特性试验研究[J].低温建筑技术,2013,35(07):128~129.
[13]Shi H S,Wu K,Guo X L,et al.Preparation of sulphoaluminate cement from municipal solid waste incineration fly ash and its hydration properties[J].Journal of Building Materials,2011,14(6):730~735+751.
[14]Guo X L,Shi H S,Huang J B.Effects of Cement Additives on Alinite Cement-Based Materials from Municipal Solid Waste Incineration(MSWI)Fly Ash[J].Key Engineering Materials,2017,727:1046~1053.
[15]Sivakumar Babu G L,Reddy K R,Chouksey S K.Constitutive model for municipal solid waste incorporating mechanicalcreep and biodegradation-induced compression[J].Waste Manag,2010,30(1):11~22.
[16]Wu K,Shi H,Schutter G D,et al.Preparation of alinite cement from municipal solid waste incineration fly ash[J].Cement&Concrete Composites,2012,34(3):322~327.
[17]Karimpourfard M,Machado S L,Shariatmadari N,et al.A laboratory study on the MSW mechanical behavior in triaxial apparatus.[J].Waste Manag,2011,31(8):1807~1819.
[18]包建强,邢永明,刘霖.矿渣硅酸盐水泥改良垃圾土的强度试验研究[J].内蒙古科技与经济,2014(19):115~116.