泥水盾构圆砾地层开挖面泥膜闭气过程试验研究
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摘要
针对武汉越江地铁泥水盾构在江中高渗透性圆砾地层带压开舱时泥膜闭气问题,开展不同配比泥浆渗透-成膜-闭气试验,测试泥浆成膜及闭气过程中泥膜性质及内部孔压变化.结果表明,泥浆密度的增大会使闭气前后泥膜压缩量及闭气值逐渐增大,而泥膜含水率、孔隙比及渗透系数逐渐减小;小密度泥浆(≤1.1 g/cm~3)形成的泥膜在小于0.2 MPa气压下被击穿,表现为圆孔透气,且内部孔压降低明显;大密度泥浆(1.15～1.2 g/cm~3)形成的泥膜均能在0.4 MPa气压下保持稳定.对本工程而言,可采用密度为1.15～1.20 g/cm~3的膨润土-黏土混合泥浆并渗透成膜8 h的方案,以满足带压开舱时开挖面稳定性要求.
Focusing on the problem of retaining gas pressure of filter cake when opening chamber under pressure by slurry shield in composite strata of round gravel with high permeability in Wuhan cross-river subway,a series of permeability-filter cake forming-airproof experiments with different ratio were carried out to test the properties of filter cake and the changes of inner pore pressure during the process of filter cake formation and airproof. The results showed that,with the increase of slurry's density,the amount of compression as well as the airproof value of filter cake were increased gradually,while the water content,pore ratio and permeability coefficient were decreasd gradually before and after the process of airproof. The filter cake formed by less dense slurry(no more than 1.1 g/cm~3)was broken down under the pressure in less than 0.2 MPa of showing the hole was breathable and the pore pressure inside the filter cake was decreased significantly. While the filter cake formed by the slurry with high density(1.15-1.2 g/cm~3)was confirmed to be stable under the pressure of 0.4 MPa. In view of this project,the plan of mixing slurry of bentonite and clay with a density of 1.15-1.20 g/cm~3 and infiltrating into filter cake for 8 hours was adopted in order to meet the requirement of excavation face's stability when opening chamber under pressure.
Focusing on the problem of retaining gas pressure of filter cake when opening chamber under pressure by slurry shield in composite strata of round gravel with high permeability in Wuhan cross-river subway,a series of permeability-filter cake forming-airproof experiments with different ratio were carried out to test the properties of filter cake and the changes of inner pore pressure during the process of filter cake formation and airproof. The results showed that,with the increase of slurry's density,the amount of compression as well as the airproof value of filter cake were increased gradually,while the water content,pore ratio and permeability coefficient were decreasd gradually before and after the process of airproof. The filter cake formed by less dense slurry(no more than 1.1 g/cm~3)was broken down under the pressure in less than 0.2 MPa of showing the hole was breathable and the pore pressure inside the filter cake was decreased significantly. While the filter cake formed by the slurry with high density(1.15-1.2 g/cm~3)was confirmed to be stable under the pressure of 0.4 MPa. In view of this project,the plan of mixing slurry of bentonite and clay with a density of 1.15-1.20 g/cm~3 and infiltrating into filter cake for 8 hours was adopted in order to meet the requirement of excavation face's stability when opening chamber under pressure.
引文
[1]袁大军,沈翔,刘学彦,等.泥水盾构开挖面稳定性研究[J].中国公路学报,2017,30(8):24-37.
[2]闵凡路,柏煜新,刘来仓,等.盾构刀具切削研究进展及非正常磨损实例分析[J].中国公路学报,2018,31(10):47-58.
[3]陈健,刘红军,闵凡路,等.盾构隧道刀具更换技术综述[J].中国公路学报,2018,31(10):36-46.
[4]朱伟,闵凡路,姚占虎,等.盾构隧道开舱技术现状及实例[J].现代隧道技术,2015,52(1):9-18.
[5]刘成,陆杨,吕伟华,等.砂性地层中盾构泥浆粗粒材料对成膜效果的影响[J].中国公路学报,2018,31(9):104-111.
[6] WATANABE T,YAMAZAKI H. Giant size slurry shield is a success in Tokyo[J]. Tunnels and Tunneling,1981,13(2):13-17.
[7] FRITZ P. Additives for slurry shields in highly permeable ground[J]. Rock Mechanics and Rock Engineering,2007,40(1):81-95.
[8] HEINZ A. Modified bentonite suspensions for geotechnical construction methods in high permeability ground[D]. Zurich,Switzerland:Swiss Federal Institute of Technology ETH,2006.
[9]程展林,吴忠明,徐言勇.砂基中泥浆盾构法隧道施工开挖面稳定性试验研究[J].长江科学院院报,2001,18(5):53-55.
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[11]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):141-146.
[12]闵凡路,魏代伟,姜腾,等.泥浆在地层中的渗透性试验研究[J].岩土力学,2014,35(10):2801-2806.
[13]白云,孔祥鹏,廖少明.泥水盾构泥膜动态形成机制研究[J].岩土力学,2010,31(S2):19-24.
[14]闵凡路,徐静波,宋航标,等.反压条件下泥水盾构开挖面致密性评价试验[J].中国公路学报,2017,30(8):216-221.
[15]王俊,何川,封坤,等.砂卵石地层中大断面泥水盾构泥膜形态研究[J].现代隧道技术,2014,51(6):108-115.
[16]闵凡路,朱伟,魏代伟.泥水盾构泥膜形成时开挖面地层孔压变化规律研究[J].岩土工程学报,2013,35(4):722-727.
[17]姜腾,夏鹏举,闵凡路.泥浆性质对泥水盾构泥膜闭气性影响试验研究[J].现代隧道技术,2016,53(2):134-140.
[18]王超,朱伟,闵凡路,等.压气条件下泥膜进气值测量试验研究[J].隧道建设,2019,39(4):626-632.
[19]张宁,姚占虎,朱伟,等.泥水盾构带压开舱时泥膜性质对其闭气性的影响研究[J].现代隧道技术,2015,52(4):62-67.
[20]张宁,朱伟,闵凡路,等.泥水盾构带压开舱时泥膜的微观孔隙及渗透性研究[J].岩土工程学报,2017,39(3):495-500.
[2]闵凡路,柏煜新,刘来仓,等.盾构刀具切削研究进展及非正常磨损实例分析[J].中国公路学报,2018,31(10):47-58.
[3]陈健,刘红军,闵凡路,等.盾构隧道刀具更换技术综述[J].中国公路学报,2018,31(10):36-46.
[4]朱伟,闵凡路,姚占虎,等.盾构隧道开舱技术现状及实例[J].现代隧道技术,2015,52(1):9-18.
[5]刘成,陆杨,吕伟华,等.砂性地层中盾构泥浆粗粒材料对成膜效果的影响[J].中国公路学报,2018,31(9):104-111.
[6] WATANABE T,YAMAZAKI H. Giant size slurry shield is a success in Tokyo[J]. Tunnels and Tunneling,1981,13(2):13-17.
[7] FRITZ P. Additives for slurry shields in highly permeable ground[J]. Rock Mechanics and Rock Engineering,2007,40(1):81-95.
[8] HEINZ A. Modified bentonite suspensions for geotechnical construction methods in high permeability ground[D]. Zurich,Switzerland:Swiss Federal Institute of Technology ETH,2006.
[9]程展林,吴忠明,徐言勇.砂基中泥浆盾构法隧道施工开挖面稳定性试验研究[J].长江科学院院报,2001,18(5):53-55.
[10]韩晓瑞,朱伟,闵凡路,等.泥浆性质对泥水盾构开挖面泥膜形成质量影响[J].岩土力学,2008,29(S):288-292.
[11]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):141-146.
[12]闵凡路,魏代伟,姜腾,等.泥浆在地层中的渗透性试验研究[J].岩土力学,2014,35(10):2801-2806.
[13]白云,孔祥鹏,廖少明.泥水盾构泥膜动态形成机制研究[J].岩土力学,2010,31(S2):19-24.
[14]闵凡路,徐静波,宋航标,等.反压条件下泥水盾构开挖面致密性评价试验[J].中国公路学报,2017,30(8):216-221.
[15]王俊,何川,封坤,等.砂卵石地层中大断面泥水盾构泥膜形态研究[J].现代隧道技术,2014,51(6):108-115.
[16]闵凡路,朱伟,魏代伟.泥水盾构泥膜形成时开挖面地层孔压变化规律研究[J].岩土工程学报,2013,35(4):722-727.
[17]姜腾,夏鹏举,闵凡路.泥浆性质对泥水盾构泥膜闭气性影响试验研究[J].现代隧道技术,2016,53(2):134-140.
[18]王超,朱伟,闵凡路,等.压气条件下泥膜进气值测量试验研究[J].隧道建设,2019,39(4):626-632.
[19]张宁,姚占虎,朱伟,等.泥水盾构带压开舱时泥膜性质对其闭气性的影响研究[J].现代隧道技术,2015,52(4):62-67.
[20]张宁,朱伟,闵凡路,等.泥水盾构带压开舱时泥膜的微观孔隙及渗透性研究[J].岩土工程学报,2017,39(3):495-500.