土压平衡盾构土体改良泡沫剂的试验研究
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摘要
文章根据土压平衡盾构隧道施工土体改良泡沫剂的技术要求,针对土压盾构所用泡沫剂的配方进行了研究。研究过程中,利用高速搅拌法对常见的表面活性剂进行了优选,确定以SDS为主发泡剂,用AES对SDS进行复配,试验结果表明,当SDS/AES复配比例为6∶4、总浓度为3 g·L~(-1)时,向体系中加入浓度为0.2 g·L~(-1)的表面活性类稳泡剂十二醇和0.04 g·L~(-1)的高分子聚合物类稳泡剂阳离子瓜尔胶,对该发泡体系具有很好的稳泡效果。由此得出经济、环保、发泡性能和稳泡性能良好的泡沫剂实验室配方,并进行了浓缩调整,得到了稳定均一的泡沫剂成品配方为6.82%SDS+4.51%AES+0.57%十二醇+0.2%阳离子瓜尔胶+87.9%水。新型泡沫剂的性能指标和经济性均优于国内外同类产品。
In light of the technical requirements of soil mass conditioning for EPB shield tunnel construction, re-search of a new foaming agent formula is conducted. A high-speed mixing method is adopted to choose the propersurface active agent, SDS is determined as the main foaming agent, and SDS is formulated again using AES. The testresults indicate that good foam stabilizing effects are obtained if the foam stabilizer dodecanol with a concentrationof 0.2 g·L~(-1) and cationic guar gum with a concentration of 0.04 g·L~(-1) of high molecular polymer are added when theSDS/AES proportion is 6∶4 and the general concentration is 3 g·L~(-1). An economical and environment friendly labo-ratory formula for a foam agent with good foamability and stability is determined, a concentration adjustment is con-ducted, and the following formula for the finished foam agent is established: 6.82%SDS+4.51%AES+0.57% dodeca-nol +0.2% cationic guar gum +87.9% water. Compared with other products at home and abroad, this new type offoam agent is an improvement in terms of performance index and economy.
In light of the technical requirements of soil mass conditioning for EPB shield tunnel construction, re-search of a new foaming agent formula is conducted. A high-speed mixing method is adopted to choose the propersurface active agent, SDS is determined as the main foaming agent, and SDS is formulated again using AES. The testresults indicate that good foam stabilizing effects are obtained if the foam stabilizer dodecanol with a concentrationof 0.2 g·L~(-1) and cationic guar gum with a concentration of 0.04 g·L~(-1) of high molecular polymer are added when theSDS/AES proportion is 6∶4 and the general concentration is 3 g·L~(-1). An economical and environment friendly labo-ratory formula for a foam agent with good foamability and stability is determined, a concentration adjustment is con-ducted, and the following formula for the finished foam agent is established: 6.82%SDS+4.51%AES+0.57% dodeca-nol +0.2% cationic guar gum +87.9% water. Compared with other products at home and abroad, this new type offoam agent is an improvement in terms of performance index and economy.
引文
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[7]许有俊,文中坤,闫履顺,等.土压平衡矩形顶管施工土体改良泡沫剂试验研究[J].铁道建筑,2015,(3):137-141.XU Youjun,WEN Zhongkun,YAN Lvshun,et al.Study of Foaming Agent for Earth Pressure Balanced Rectangular Pipe Jacking Construction[J].Railway Engineering,2015,(3):137-141.
[8]LIU Dianzhong,HE Shuming,LI Ying.Discussion of Foam Concrete Foaming Agent[J].Wall Material Innovation and Energy Saving in Buildings,2013,(8):39-41.
[9]郭志伟,徐昌学,路遥,等.泡沫起泡性、稳定性及评价方法[J].化学工程师,2006,(4):51-54.GUO Zhiwei,XU Changxue,LU Yao,et al.Foamability and Stability of Foam and Means of Evaluating[J].Chemical Engineer,2006,(4):51-54.
[10]刘常旭,等.表面活性剂发泡体系的实验室研究[J].精细石油化工进展,2007,8(1):7-10.LIU Changxu,et al.Laboratory Study of Surfactant Foaming System[J].Advance in Fine Petrochemicals,2007,8(1):7-10.
[11]史晓婉,许永和.用于盾构施工的泡沫材料优化设计[J].建筑施工,2015,36(4):444-446.SHI Xiaowan,XU Yonghe.Optimal Design of Foamed Material Used in Shield Construction[J].Building Construction,2015,36(4):444-446.
[12]刘大鹏.新型泡沫对土压平衡盾构土体改良作用效果评[D].北京:中国地质大学,2012.LIU Dapeng.The Appraisal of Improving the Soil Conditioning of EPBS with New Foam[D].Beijing:China University of Geosciences,2012.
[2]闫鑫,龚秋明,姜厚停.土压平衡盾构施工中泡沫改良砂土的试验研究[J].地下空间与工程学报,2010,6(3):449-453.YAN Xin,GONG Qiuming,JIANG Houting.Soil Conditioning for Earth-Pressure Balanced Shields Excavation in Sand Layers[J].Chinese Journal of Underground Space and Engineering,2010,6(3):449-453.
[3]魏康林.土压平衡盾构施工中泡沫和膨润土改良土体的微观机理分析[J].现代隧道技术,2007,44(1):73-77.WEI Kanglin.Micro-mechanism Analysis for the Soil Improvement by Foam and Bentonite in EPB Shield Tunneling[J].Modern Tunnelling Technology,2007,44(1):73-77.
[4]潘国灵,江涛,刘佳明,等.泡沫在盾构隧道施工中的应用[J].低温建筑技术,2011,(9):102-104.PAN Guoling,JIANG Tao,LIU Jiaming,et al.Application of Foam in the Construction of Shield Tunnel[J].Low Temperature Architecture Technology,2011,(9):102-104.
[5]唐卓华,徐前卫,杨新安,等.富水砂层盾构掘进碴土改良技术[J].现代隧道技术,2016,53(1):153-158.TANG Zhuohua,XU Qianwei,YANG Xin′an,et al.Soil Conditioning Technology for Shield Tunnelling in a Water-Rich Sandy Stratum[J].Modern Tunnelling Technology,2016,53(1):153-158.
[6]朱俊易.土压平衡盾构中土体改良泡沫剂实验研究[D].北京:中国地质大学,2009.ZHU Junyi.Experimental Research on Foam Agent in EPB Shield with Soil Conditioning[D].Beijing:China University of Geosciences,2009.
[7]许有俊,文中坤,闫履顺,等.土压平衡矩形顶管施工土体改良泡沫剂试验研究[J].铁道建筑,2015,(3):137-141.XU Youjun,WEN Zhongkun,YAN Lvshun,et al.Study of Foaming Agent for Earth Pressure Balanced Rectangular Pipe Jacking Construction[J].Railway Engineering,2015,(3):137-141.
[8]LIU Dianzhong,HE Shuming,LI Ying.Discussion of Foam Concrete Foaming Agent[J].Wall Material Innovation and Energy Saving in Buildings,2013,(8):39-41.
[9]郭志伟,徐昌学,路遥,等.泡沫起泡性、稳定性及评价方法[J].化学工程师,2006,(4):51-54.GUO Zhiwei,XU Changxue,LU Yao,et al.Foamability and Stability of Foam and Means of Evaluating[J].Chemical Engineer,2006,(4):51-54.
[10]刘常旭,等.表面活性剂发泡体系的实验室研究[J].精细石油化工进展,2007,8(1):7-10.LIU Changxu,et al.Laboratory Study of Surfactant Foaming System[J].Advance in Fine Petrochemicals,2007,8(1):7-10.
[11]史晓婉,许永和.用于盾构施工的泡沫材料优化设计[J].建筑施工,2015,36(4):444-446.SHI Xiaowan,XU Yonghe.Optimal Design of Foamed Material Used in Shield Construction[J].Building Construction,2015,36(4):444-446.
[12]刘大鹏.新型泡沫对土压平衡盾构土体改良作用效果评[D].北京:中国地质大学,2012.LIU Dapeng.The Appraisal of Improving the Soil Conditioning of EPBS with New Foam[D].Beijing:China University of Geosciences,2012.