基于扰动状态概念理论的固化淤泥一维压缩模型
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摘要
采用低碳、环保的镁质水泥对淤泥进行固化处理,研究了不同龄期下固化淤泥一维压缩特性。采用新型环刀制样方法,开展了镁质水泥固化淤泥的一维压缩实验研究。结果表明:固化淤泥的压缩曲线与结构性土变化趋势类似,固化淤泥的ln(1+e)–lgσ′v曲线存在一个明显的拐点(结构屈服应力),且随着龄期的增长,固化淤泥的结构屈服应力逐渐增大。基于扰动状态概念理论,提出了能反应固化淤泥强化与弱化并存的一维压缩模型,试验验证了该模型可以较好预测任意龄期下固化淤泥的一维压缩特性。
The low-carbon, environmental-friendly magnesia cement is used to solidify the silt, and the compression characteristics of the solidified silt at different ages are investigated based on the one-dimensional compression tests. A series of one-dimensional compression tests on the magnesia cement-cured silt under different curing ages are carried out using a new ring knife sample preparation method. It is found that there exists an obvious inflection point, structural yield stress, on the ln(1+e)-lgσ′v curve, which is similar to structural soils. Moreover, the structural yield stress of the solidified silt increases gradually with the increase of the curing age. Furthermore, an one-dimensional compression model to characterize the strengthening and weakening properties coexisted in the magnesia cement-solidified silt is proposed based on the concept of disturbed state. The experimental results show that the proposed model can reproduce well the one-dimensional compression characteristics of the solidified silt at any age.
The low-carbon, environmental-friendly magnesia cement is used to solidify the silt, and the compression characteristics of the solidified silt at different ages are investigated based on the one-dimensional compression tests. A series of one-dimensional compression tests on the magnesia cement-cured silt under different curing ages are carried out using a new ring knife sample preparation method. It is found that there exists an obvious inflection point, structural yield stress, on the ln(1+e)-lgσ′v curve, which is similar to structural soils. Moreover, the structural yield stress of the solidified silt increases gradually with the increase of the curing age. Furthermore, an one-dimensional compression model to characterize the strengthening and weakening properties coexisted in the magnesia cement-solidified silt is proposed based on the concept of disturbed state. The experimental results show that the proposed model can reproduce well the one-dimensional compression characteristics of the solidified silt at any age.
引文
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[10]朱剑锋,饶春义,庹秋水,等.硫氧镁水泥复合固化剂加固淤泥质土的试验研究[J].岩石力学与工程学报,2019,38(增1):3206-3213.(ZHU Jian-feng,RAO Chun-yi,TUO Qiu-shui,et al.Experimental study on the properties of the organic soil solidified by the composite magnesium oxysulfate cementcuring agent[J].Chinese Journal of Rock Mechanics and Engineering,2019,38(S1):3206-3213.(in Chinese))
[11]BUTTERFIELD R.A natural compression law for soils[J].Géotechnique,1979,29(4):469-480.
[12]LEROUEIL S,TAVENAS F,LE BIHAN J P.Propriétés caractéristiques des argiles de l’est du Canada[J].Canadian Geotechnical Journal,1983,20:681-705.
[2]徐日庆,邵玉芳.温州半岛工程海堤淤泥质地基加固试验研究[J].浙江大学学报(农业与生命科学版),2005,31(4):475-478.(XU Ri-qing,SHAO Yu-fang.Experimental study on treating the silty foundation of sea dike in Wenzhou Peninsula construction project[J].Journal of Zhejiang University(Agric&Life Sci),2005,31(4):475-478.(in Chinese))
[3]丁建文,吴学春,李辉,等.疏浚淤泥固化土的压缩特性与结构屈服应力[J].工程地质学报,2012,20(4):627-632.(DING Jian-wen,WU Xue-chun,LI Hui,et al.Compression properties and structure yield stress for solidified soil composing of dredged clays[J].Journal of Engineering Geology,2012,20(4):627-632.(in Chinese))
[4]王宏伟,王东星,贺扬.MgO改性淤泥固化土压缩特性试验[J].中南大学学报(自然科学版),2017,48(8):2133-2141.(WANG Hong-wei,WANG Dong-xing,HE Yang.Experimental study on compressibility behavior of solidified dredged sludge with reactive MgO[J].Journal of Central South University(Science and Technology),2017,48(8):2133-2141.(in Chinese))
[5]黄英豪,朱伟,周宣兆,等.固化淤泥压缩特性的试验研究[J].岩土力学,2012,33(10):2923-2928.(HUANGYing-hao,ZHU Wei1,ZHOU Xuan-zhao,et al.Experimental study of compressibility behavior of solidified dredged material[J].Rock and Soil Mechanics,2012,33(10):2923-2928.(in Chinese))
[6]HORPIBULSUK S,LIU M D,LIYANAPATHIRANA D S,et al.Behaviour of cemented clay simulated via the theoretical framework of the Structured Cam Clay model[J].Computers and Geotechnics,2010,37:1-9.
[7]朱剑锋,徐日庆.考虑扰动影响修正Duncan-Chang模型的二次开发[J].岩土工程学报,2015,37(增刊1):84-88.(ZHU Jian-feng,XU Ri-qing.Secondary development of modified Duncan-Chang model considering disturbance[J].Chinese Journal of Geotechnical Engineering,2015,37(S1):84-88.(in Chinese))
[8]LIU M D,CARTER J P,DESAI C S,et al.Analysis of the compression of structured soils using the disturbed state concept[J].International Journal for Numerical and Analytical Methods in Geomechnics,2000,24:723-735.
[9]UNLUER C,AL-TABBAA A.Impact of hydrated magnesium carbonate additives on the carbonation of reactive Mg Ocements[J].Cement and Concrete Research,2013,54:87-97.
[10]朱剑锋,饶春义,庹秋水,等.硫氧镁水泥复合固化剂加固淤泥质土的试验研究[J].岩石力学与工程学报,2019,38(增1):3206-3213.(ZHU Jian-feng,RAO Chun-yi,TUO Qiu-shui,et al.Experimental study on the properties of the organic soil solidified by the composite magnesium oxysulfate cementcuring agent[J].Chinese Journal of Rock Mechanics and Engineering,2019,38(S1):3206-3213.(in Chinese))
[11]BUTTERFIELD R.A natural compression law for soils[J].Géotechnique,1979,29(4):469-480.
[12]LEROUEIL S,TAVENAS F,LE BIHAN J P.Propriétés caractéristiques des argiles de l’est du Canada[J].Canadian Geotechnical Journal,1983,20:681-705.