压气条件下泥膜进气值测量试验研究
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摘要
在压气条件下,进气是泥膜透气失效的起始点。为测量并研究泥膜在气压下的进气压力值(进气值),通过自制的试验装置,在不同压气条件下对3种泥膜进行进气值测量试验。试验结果表明:1)由闭气排水与固结排水的差值可以辨别泥膜是否进气,得到泥膜进气值; 2)采用泥膜特征孔径D_(90)/2代入推导公式可近似计算泥膜进气值; 3)泥膜在不同压气条件下进气值不同,增压速率越低,泥膜进气值越大; 4)在较快和较慢的增压速率下存在进气值变化趋于稳定的现象,最大进气值为最小值的2倍以上。
Under air pressure, air inflow is the starting point for the failure of filter cake. In order to measure and study air-entry value(AEV) of filter cake under air pressure, through self-made test device, the measurement of the AEV of three kinds of filter cakes under different pressure conditions is carried out. The results show that:(1) The difference value between air-closed draining and consolidation drainage can be used to distinguish whether air inflow happens or not, and AEV of filter cake can be obtained.(2) AEV can be approximately calculated by substituting the characteristic pore diameter D_(90)/2 into the derivation formula.(3) AEV of filter cake is different under different air pressure conditions, the lower the rate of pressurization, the larger the AEV is.(4)The change of AEV at a faster and slower rate of pressurization rate tends to be stable, the maximum AEV is more than two times the minimum.
Under air pressure, air inflow is the starting point for the failure of filter cake. In order to measure and study air-entry value(AEV) of filter cake under air pressure, through self-made test device, the measurement of the AEV of three kinds of filter cakes under different pressure conditions is carried out. The results show that:(1) The difference value between air-closed draining and consolidation drainage can be used to distinguish whether air inflow happens or not, and AEV of filter cake can be obtained.(2) AEV can be approximately calculated by substituting the characteristic pore diameter D_(90)/2 into the derivation formula.(3) AEV of filter cake is different under different air pressure conditions, the lower the rate of pressurization, the larger the AEV is.(4)The change of AEV at a faster and slower rate of pressurization rate tends to be stable, the maximum AEV is more than two times the minimum.
引文
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[15] 解迎革,王国栋,薛绪掌,等.土壤进气值和发泡点测定方法的研究[J].西北农林科技大学学报(自然科学版),2005,33(9):108.XIE Yingge,WANG Guodong,XUE Xuzhang,et al.Measurement of air entry value and bubbling point of soils[J].Journal of Northwest A & F University (Natural Science Edition),2005,33(9):108.
[2] 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.ZHU Wei,MIN Fanlu,YAO Zhanhu,et al.Technical status and case study of intervention in the shield chamber[J].Modern Tunnelling Technology,2015,52(1):9.
[3] KOYAMA Y.Present status and technology of shield tunneling method in Japan[J].Tunnelling & Underground Space Technology Incorporating Trenchless Technology Research,2003,18(2):145.
[4] ERRENKNECHT E H M,BAPPLER K.Compressed air work with tunnel boring machines[C]//Underground Space:The 4th Dimension of Metropolises.London:Talyor & Francis Group,2007:1175.
[5] 吴忠善,杨钊,杨擎.超大直径泥水盾构带压进舱换刀技术研究与应用[J].隧道建设,2014,34(7):673.WU Zhongshan,YANG Zhao,YANG Qing.Research on and application of technologies for cutting tool replacement under hyperbaric condition in super-large diameter slurry shield boring[J].Tunnel Construction,2014,34(7):673.
[6] MIN Fanlu,ZHU Wei,LIN Cheng,et al.Opening the excavation chamber of the large-diameter size slurry shield:a case study in Nanjing Yangtze River Tunnel in China[J].Tunnelling and Underground Space Technology,2015,46(10):18.
[7] 姜腾,朱伟,闵凡路,等.泥水盾构开舱时的泥膜闭气性能及改性方法[J].地下空间与工程学报,2014,10(3):504.JIANG Teng,ZHU Wei,MIN Fanlu,et al.Airproof capability and modification of the filter cake in slurry shield[J].Chinese Journal of Underground Space and Engineering,2014,10(3):504.
[8] 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.JIANG Teng,XIA Pengju,MIN Fanlu.Experimental study of the influence of slurry properties on the airtightness of the filter cakes of slurry shields[J].Modern Tunnelling Technology,2016,53(2):134.
[9] 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.ZHANG Ning,YAO Zhanhu,ZHU Wei,et al.Effects of filter cake charateristics on airtightness during hyperbaric intervention in slurry shield tunnelling[J].Modern Tunnelling Technology,2015,52(4):62.
[10] 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.ZHANG Ning,ZHU Wei,MIN Fanlu,et al.Study of filter cake to its microscopic pores and permeability during opening chamber under high pressure in slurry shield[J].Chinese Journal of Geotechnical Engineering,2017,39(3):495.
[11] GENUCHTEN V M T.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44(5):892.
[12] FREDLUND D G,XING Anqing.Equations for the soil-water characteristic curve[J].Canadian Geotechnical Journal,1994,31(4):521.
[13] 郑海亮,陈家军,杨建,等.基于水气二相流原理确定陶土头进气值、发泡点[J].水文地质工程地质,2009,36(2):123.ZHENG Hailiang,CHEN Jiajun,YANG Jian,et al.Determination of the air entry value and bubbling value of a ceramic cup based on two-phase flow mechanism in porous media[J].Hydrogeology & Engineering Geology,2009,36(2):123.
[14] 姚海林.关于基质吸力及几个相关问题的一些思考[J].岩土力学,2005,26(1):67.YAO Hailin.Some considerations about the concept of matric suction and questions related to matric suction[J].Rock and Soil Mechanics,2005,26(1):67.
[15] 解迎革,王国栋,薛绪掌,等.土壤进气值和发泡点测定方法的研究[J].西北农林科技大学学报(自然科学版),2005,33(9):108.XIE Yingge,WANG Guodong,XUE Xuzhang,et al.Measurement of air entry value and bubbling point of soils[J].Journal of Northwest A & F University (Natural Science Edition),2005,33(9):108.