复合地层泥水盾构环流关键参数选择探析
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摘要
为研究复合地层泥水盾构泥水环流参数选择的问题,结合狮子洋隧道盾构工程,采用泥浆临界沉淀流速计算方法计算软弱地层和软硬不均地层所需的泥浆送、排量,并运用费祥俊模型试验公式进行验算。由于复合地层地质条件的复杂性,泥水盾构环流参数的影响因素较多,结合以上计算结果分析不同地层特性对泥浆送、排量的影响。研究结果表明:1)2种方法的泥浆送、排量计算结果相差不大,证明泥浆临界沉淀流速计算方法具有准确性和合理性;2)在软硬不均地层进行泥水盾构施工时,应加大泥浆送、排量,以减少输送颗粒在排浆管内滑移、平动,同时减少舱内积碴和泥浆管的磨损。研究结果可为复合地层下的泥水盾构施工提供参考。
In order to study the parameter selection for slurry circulation system of slurry shield in complex strata,the calculation method of critical flow velocity of mud are adopted to calculate delivery and discharge volume of slurry required for soft ground stratum and hard and soft strata by taking Shiziyang Shield Tunnel for example; and the Fei Xiangjun model test formula is used to verified the results. And then the influence of different formation characteristics on delivery and discharge volume of slurry is analyzed by calculation results. The results show that:( 1) The results of mud flow obtained by the two methods are almost the same,so as to prove the accuracy and rationality of the calculation methods.( 2) The delivery and discharge volume of slurry should be increased to make muck transport smoothly in slurry pipe,and reduce wear of slurry pipe when tunneling in hard and soft strata. The results can provide reference for the construction of slurry shield in composite strata of similar projects in the future.
In order to study the parameter selection for slurry circulation system of slurry shield in complex strata,the calculation method of critical flow velocity of mud are adopted to calculate delivery and discharge volume of slurry required for soft ground stratum and hard and soft strata by taking Shiziyang Shield Tunnel for example; and the Fei Xiangjun model test formula is used to verified the results. And then the influence of different formation characteristics on delivery and discharge volume of slurry is analyzed by calculation results. The results show that:( 1) The results of mud flow obtained by the two methods are almost the same,so as to prove the accuracy and rationality of the calculation methods.( 2) The delivery and discharge volume of slurry should be increased to make muck transport smoothly in slurry pipe,and reduce wear of slurry pipe when tunneling in hard and soft strata. The results can provide reference for the construction of slurry shield in composite strata of similar projects in the future.
引文
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[12]张兴荣.管道水力输送[M].北京:中国水利水电出版社,1998.ZHANG Xingrong.Pipeline hydraulic conveying[M].Beijing:China Water&Power Press,1998.
[2]王瑞斌.泥水平衡盾构进、排浆系统技术[J].隧道建设,2004,24(6):27.WANG Ruibin.Technology for slurry injection and discharge system of slurry shield[J].Tunnel Construction,2004,24(6):27.
[3]秦邦江,夏毅敏.泥水盾构泥浆环流系统管路压力损失分析与计算[J].液压气动与密封,2016(7):52.QIN Bangjiang,XIA Yimin.The differential pressure analysis and calculation of pipeline circulation system in slurry shield[J].Hydraulics Pneumatics&Seals,2016(7):52.
[4]黄波,李晓龙,陈长江.大直径泥水盾构复杂地层长距离掘进过程中的泥浆管路磨损研究[J].隧道建设,2016,36(4):490.HUANG Bo,LI Xiaolong,CHEN Changjiang.Study of abrasion of slurry pipe of large-dmeter slurry shield boring in complex strata[J].Tunnel Construction,2016,36(4):490.
[5]曾垂刚.泥水盾构泥浆循环技术的探讨[J].隧道建设,2009,29(2):162.ZENG Chuigang.Discussion on slurry circulation technology of slurry shield machine[J].Tunnel Construction,2009,29(2):162.
[6]夏毅敏,王洋,吴遁,等.泥水盾构环流系统管道输送特性[J].中南大学学报(自然科学版),2017,48(11):2889.XIA Yimin,WANG Yang,WU Dun,et al.Transport characteristics of shield slurry system[J].Journal of Central South University(Science and Technology),2017,48(11):2889.
[7]曹斌,徐心一,夏建新.水力输送管道中粗颗粒运动状态变化及其判别[J].应用基础与工程科学学报,2016,24(4):672.CAO Bin,XU Xinyi,XIA Jianxin.Movement status change of coarse particlesand and its discriminant parameter in hydraulic transporting pipeline[J].Journal of Basic Science and Engineering,2016,24(4):672.
[8]曹斌,夏建新,黑鹏飞,等.复杂形态管道中粗颗粒水力输送的临界条件研究[J].金属矿山,2012(3):27.CAO Bin,XIA Jianxin,HEI Pengfei,et al.Study of critical conditions of coarse grains in pipeline hydraulic transport with the complex form[J].Metal Mine,2012(3):27.
[9]周知进,刘爱军,夏毅敏,等.颗粒组分特性对扬矿硬管输送速度的影响[J].中南大学学报(自然科学版),2011,42(9):2692.ZHOU Zhijin,LIU Aijun,XIA Yimin,et al.Influence of particles component propreties on transporting speed in lifting pipeline[J].Journal of Central South University(Science and Technology),2011,42(9):2692.
[10]苏志学,蒲晓波,贺开伟,等.泥水平衡盾构泥浆泵选型设计研究[J].装备制造技术,2015(3):87.SU Zhixue,PU Xiaobo,HE Kaiwei,et al.Selection and design on slurry pump of slurry shield machine[J].Equipment Manufacturing Technology,2015(3):87.
[11]张宁川.泥水盾构主机推进速度与泥浆系统能力的匹配[J].隧道建设,2007,27(6):7.ZHANG Ningchuan.Matching between thrust speed of main shield machine and capacity of slurry system[J].Tunnel Construction,2007,27(6):7.
[12]张兴荣.管道水力输送[M].北京:中国水利水电出版社,1998.ZHANG Xingrong.Pipeline hydraulic conveying[M].Beijing:China Water&Power Press,1998.
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