海水环境下盾构泥浆性能试验研究
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摘要
为解决泥水盾构在海水地层中掘进时的泥浆配制问题,以苏埃通道工程为依托,采用室内试验的研究方法,进行淡水泥浆和海水泥浆的性能对比试验和海水渗入淡水泥浆试验,以及海水泥浆的不同添加剂和固相材料配比试验,并开展淡水泥浆在海水地层环境中的成膜试验,得到以下结论:1)无添加剂时淡水基浆中膨润土比例宜取为18%～24%,对于质量分数为30%的基浆可通过添加纯碱来降低黏度; 2)随着膨润土含量的增加,不同海水渗入量对淡水泥浆胶体率的影响降低、对黏度的影响提高; 3) HPMC可提高海水泥浆的胶体率,降低离析速率,但会使泥浆黏度增大; 4)固相比例不变时,加入黏土可改善膨润土与HPMC反应黏度过大的问题,但会提高海水泥浆的滤失量; 5) 18%比例的膨润土淡水泥浆在苏埃通道工程海水环境下的砂性地层中成膜效果较好。
In order to determine the mixing proportions of slurry during slurry shield tunneling under seawater formation environment,the laboratory tests,including performance comparison test between fresh water slurry and seawater slurry,seawater infiltrating fresh water slurry test,different mixing proportion test with additives and solid phase materials,and filter cake formation test of fresh water slurry under seawater formation environment,are conducted.The test results show that:(1) The appropriate bentonite proportion of fresh water slurry without additive should be 18% to 24%,and the viscosity can be reduced by adding carbonate for slurry concentration of 30%.(2) With the increase of bentonite content,the effect of seawater infiltration capacities on slurry colloid fraction decreases and that on viscosity increases.(3) Hydroxy propyl methyl cellulose(HPMC) can increase the seawater slurry colloid fraction and the slurry viscosity,and reduce the segregation rate.(4) When the solid phase ratio is fixed,the addition of clay can solve the problem of excessive viscosity caused by reaction of bentonite and HPMC,but will also increase the filter loss of seawater slurry.(5) The film-forming effect of fresh water slurry with bentonite content of 18% under seawater environment of Su'ai Tunnel is good.
In order to determine the mixing proportions of slurry during slurry shield tunneling under seawater formation environment,the laboratory tests,including performance comparison test between fresh water slurry and seawater slurry,seawater infiltrating fresh water slurry test,different mixing proportion test with additives and solid phase materials,and filter cake formation test of fresh water slurry under seawater formation environment,are conducted.The test results show that:(1) The appropriate bentonite proportion of fresh water slurry without additive should be 18% to 24%,and the viscosity can be reduced by adding carbonate for slurry concentration of 30%.(2) With the increase of bentonite content,the effect of seawater infiltration capacities on slurry colloid fraction decreases and that on viscosity increases.(3) Hydroxy propyl methyl cellulose(HPMC) can increase the seawater slurry colloid fraction and the slurry viscosity,and reduce the segregation rate.(4) When the solid phase ratio is fixed,the addition of clay can solve the problem of excessive viscosity caused by reaction of bentonite and HPMC,but will also increase the filter loss of seawater slurry.(5) The film-forming effect of fresh water slurry with bentonite content of 18% under seawater environment of Su'ai Tunnel is good.
引文
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[14]孙晓娜,李勇萍,罗敏.浅谈海水泥浆及其与淡水泥浆的区别[J].江西建材,2014(13):68.SUN Xiaona,LI Yongping,LUO Min.Discussion on difference between sea water slurry and fresh water slurry[J].Jiangxi Building Materials,2014(13):68.
[15]闵凡路,姜腾,魏代伟,等.泥水盾构带压开舱时泥浆配制及泥膜形成实验研究[J].隧道建设,2014,34(9):857.MIN Fanlu,JIANG Teng,WEI Daiwei,et al.Experimental study of preparation and filter membrane formation of slurry during hyperbaric operation in tunneling by slurry shield[J].Tunnel Construction,2014,34(9):857.
[2]毛志坚,林海,高超.超大直径桩海水造浆的工艺研究与应用[J].公路,2006(6):210.MAO Zhijian,LIN Hai,GAO Chao.Research and application of seawater slurry preparation technology for super-large diameter piles[J].Highway,2006(6):210.
[3]袁大军,李兴高,李建华,等.北京地下直径线泥水盾构泥浆特性参数确定[J].建筑技术,2009,40(3):279.YUAN Dajun,LI Xinggao,LI Jianhua,et al.Determination of mud and water characteristic parameters of slurry shield of Beijing underground straight rail transit line[J].Architecture Technology,2009,40(3):279.
[4]FRITZ P.Additives for slurry shields in highly permeable ground[J].Rock Mechanics and Rock Engineering,2007,40(1):81.
[5]魏代伟,朱伟,闵凡路.砂土地层泥水盾构泥膜形成时间及泥浆压力转化率的试验研究[J].岩土力学,2014(2):423.WEI Daiwei,ZHU Wei,MIN Fanlu.Experimental study of forming time of filter cake and conversion rate of slurry pressure in slurry shield in sand stratum[J].Rock and Soil Mechanics,2014(2):423.
[6]叶伟涛,王靖禹,付龙龙,等.福州中粗砂地层泥水盾构泥浆成膜特性试验研究[J].岩石力学与工程学报,2018,37(5):1260.YE Weitao,WANG Jingyu,FU Longlong,et al.Laboratory test and characteristic of filter film formation of slurry shield in medium-coarse sand stratum in Fuzhou[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(5):1260.
[7]闵凡路,徐静波,杜佳芮,等.大直径泥水盾构砾砂地层泥浆配制及成膜试验研究[J].现代隧道技术,2015,52(6):141.MIN Fanlu,XU Jingbo,DU Jiarui,et al.Experimental study of the slurry preparation and filter cake formation for a large-diameter slurry shield in gravel and sand stratum[J].Modern Tunnelling Technology,2015,52(6):141.
[8]王中文,刘宏波,蔡爱杰.海水泥浆在沿海地区钻孔灌注桩中的应用[J].桥梁建设,2001(6):46.WANG Zhongwen,LIU Hongbo,CAI Aijie.Application of seawater slurry for bored piles in the coastland[J].Bridge Construction,2001(6):46.
[9]刘晶晶,李天生,王伟.钻孔灌注桩海水泥浆材料的试验研究[J].岩土工程技术,2016,30(4):163.LIU Jingjing,LI Tiansheng,WANG Wei.The experimental study of materials of sea water slurry for bored pile[J].Geotechnical Engineering Technique,2016,30(4):163.
[10]高超.港珠澳大桥桩基工程海水泥浆配制技术[J].中国市政工程,2015(5):47.GAO Chao.The preparation technology of sea mud about pile project in the Hong Kong-Zhuhai-Macau Bridge[J].China Municipal Engineering,2015(5):47.
[11]崔溦,黄小龙,李永杰.陆丰核电海底排水隧道泥水盾构泥浆配比试验研究[J].水电能源科学,2018,36(6):125.CUI Wei,HUANG Xiaolong,LI Yongjie.Experimental study of preparation of slurry for slurry shields about the bottom of sea drainage tunnel in Lufeng[J].Water Resources and Power,2018,36(6):125.
[12]杜佳芮,闵凡路,姚占虎,等.海水侵入条件下泥水盾构泥浆及泥膜性质变化试验研究[J].隧道建设(中英文),2018,38(7):1182.DU Jiarui,MIN Fanlu,YAO Zhanhu,et al.Experimental study of property change of slurry and filter cake of slurry shield under seawater intrusion[J].Tunnel Construction,2018,38(7):1182.
[13]蒋龙.砂卵石地层泥水盾构泥浆材料选择及配比优化分析[D].北京:北京交通大学,2014.JIANG Long.Mud materials selection in slurry shield and ratio optimization analysis used for sandy cobble ground[D].Beijing:Beijing Jiaotong University,2014.
[14]孙晓娜,李勇萍,罗敏.浅谈海水泥浆及其与淡水泥浆的区别[J].江西建材,2014(13):68.SUN Xiaona,LI Yongping,LUO Min.Discussion on difference between sea water slurry and fresh water slurry[J].Jiangxi Building Materials,2014(13):68.
[15]闵凡路,姜腾,魏代伟,等.泥水盾构带压开舱时泥浆配制及泥膜形成实验研究[J].隧道建设,2014,34(9):857.MIN Fanlu,JIANG Teng,WEI Daiwei,et al.Experimental study of preparation and filter membrane formation of slurry during hyperbaric operation in tunneling by slurry shield[J].Tunnel Construction,2014,34(9):857.