用固化剂GX08加固杭州海湖相软土的强度特性研究
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摘要
为了验证固化剂GX08加固杭州海湖相软土的效果及考察有机质对水泥固化的不利影响,对固化土的强度特性进行了试验研究。结果表明,有机质的添加会显著阻碍固化土强度的增长,而固化剂GX08能有效增强固化土的强度;固化土强度与有机质含量存在二次函数关系,与水泥掺量呈线性关系,与固化剂GX08掺量和龄期都以对数函数的形式相关;将总灰水比C/W用于固化土强度模型的建立,通过对试验数据的分析与整理,建立了同时考虑固化土中有机质含量、水泥掺量、固化剂掺量和龄期影响的固化土综合强度预测模型。最后对模型进行了推广使用,验证了模型的适用性。
To validate the stabilization effect of stabilizing agent GX08 treating the marine and lacustrine soft soil in Hangzhou, and to investigate the adverse influence of organic matter on cementing soft soil, unconfined compressive strength(UCS) tests are performed on stabilized soils. Test results indicate that organic matter significantly hinder the growth of the strength of stabilized soil, whereas stabilizing agent GX08 can effectively enhance the strength of the stabilized soil. The results show that the strength of stabilized soil is well correlated with organic matter content as a form of quadratic function, and it is correlated linearly with cement content, and both are correlated as the form of logarithmic function with stabilizing agent GX08 content and curing time. The total cement/water is applied to the establishment of the stabilized soil strength model. Based on the analysis of tests data, a predict model, considering the influences of organic matter content, cement content, stabilizing agent content and curing time on the strength of stabilized soil, is proposed to predict strength development. Finally, the model is to be promoted to use, so as to verify the applicability of the model.
To validate the stabilization effect of stabilizing agent GX08 treating the marine and lacustrine soft soil in Hangzhou, and to investigate the adverse influence of organic matter on cementing soft soil, unconfined compressive strength(UCS) tests are performed on stabilized soils. Test results indicate that organic matter significantly hinder the growth of the strength of stabilized soil, whereas stabilizing agent GX08 can effectively enhance the strength of the stabilized soil. The results show that the strength of stabilized soil is well correlated with organic matter content as a form of quadratic function, and it is correlated linearly with cement content, and both are correlated as the form of logarithmic function with stabilizing agent GX08 content and curing time. The total cement/water is applied to the establishment of the stabilized soil strength model. Based on the analysis of tests data, a predict model, considering the influences of organic matter content, cement content, stabilizing agent content and curing time on the strength of stabilized soil, is proposed to predict strength development. Finally, the model is to be promoted to use, so as to verify the applicability of the model.
引文
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[2]顾明光,龚日祥,颜铁增,等.杭州上泥盆统西湖组露头层序地层研究[J].华南地产与矿产,2009(1):8-13.GU Ming-guang,GONG Ri-xiang,YAN Tie-zeng,et al.Study on outcrop sequence stratigraphy of the upper devonian Xihu formation in Hangzhou[J].Geology and Mineral Resources of South China,2009(1):8-13.
[3]林春明,黄志诚,朱嗣昭.杭州湾沿岸平原晚第四纪沉积特征和沉积过程[J].地质学报,1999,73(2):120-130.LIN Chun-ming,HUANG Zhi-cheng,ZHU Si-shao.Late Quaternary sedimentary characteristics and processes in the Hangzhou Bay coastal plain[J].Acta Geologica Sinica,1999,73(2):120-130.
[4]HORPIBULSUK S,RACHAN R,SUDDEEPONG A.Assessment of strength development in blended cement admixed Bangkok clay[J].Construction and Building Materials,2011,25:1521-1531.
[5]HORPIBULSUK S,SHIBUYA S,FUENKAJORN K,et al.Assessment of engineering properties of Bangkok clay[J].Canadian Geotechnical Journal,2007,44:173-187.
[6]AZUMA K,OHISHI K,ISHIII T.Application of FGC deep mixing to the brace excavation[C]//Proceedings of Soft Ground Engineering in Coastal Areas.Leiden:[s.n.],2003:223-232.下转第1554页
[7]SHENBAGA R K,VASANT G.H.Compressive strength of cement stabilized fly ash-soil mixtures[J].Cement and Concrete Research.1999(29):673-677.
[8]FILZ G M,HODGES D K,WEATHERBY D E,et al.Standardized definitions and laboratory procedures for soil-cement specimens applicable to the wet method of deep mixing[J].Innovations in Grouting and Soil Improvement,2005:1-13.
[9]HORPIBULSUK S,NORIHIKO M,NAGARAJ T S,Clay-water/cement ratio identity for cement admixed soft clays[J].Journal of Geotechnical and Geoenvionmental Engineering,2005,131(2):187-192.
[10]储诚富,洪振舜,刘松玉.用似水灰比对水泥土无侧限抗压强度的预测[J].岩土力学,2005,26(4):645-649.CHU Cheng-fu,HONG Zhen-shun,LIU Song-yu.Prediction of unconfined compressive strength of cemented soils with quasi-water-cement ratio[J].Rock and Soil Mechanics,2005,26(4):645-649.
[11]NARENDRA B,SIVAPULLAIAH P,SURESH S,et al.Prediction of unconfined compressive strength of soft grounds using computational intelligence techniques:A comparative study[J].Computers and Geotechnics,2006,33(3):196-208.
[12]HARVEY R,HARRIS P,HERBERT E,et al.Natural organic matter and the formation of calcium-silicatehydrates in lime-stabilized smectites:A thermal analysis study[J].Thermochimica Acta,2010,505(1-2):106-113.
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