泥浆和岩渣特性对泥水平衡盾构气垫舱岩渣排出规律影响研究  

Study on the Influence of Slurry and Rock Muck Characteristics on Rock Muck Discharge from the Air Cushion Chamber of Slurry Balance Shield Machine

作　　者：于文端 丁万涛 王承震[1] 孙腾云 郭晨涛 王志成[1] 王涵 YU Wenduan;DING Wantao;WANG Chengzhen;SUN Tengyun;GUO Chentao;WANG Zhicheng;WANG Han(China Railway 14th Bureau Group Co.,Ltd.,Jinan 250014;School of Qilu Transportation,Shandong University,Jinan 250012)

机构地区：[1]中铁十四局集团有限公司,济南250014 [2]山东大学齐鲁交通学院,济南250012

出　　处：《现代隧道技术》2024年第4期192-201,共10页Modern Tunnelling Technology

基　　金：国家自然科学基金面上项目(52278403);山东省自然科学基金(ZR2021ME135).

摘　　要：泥水平衡盾构机气垫舱内岩渣的快速排出对于保证施工安全和提高掘进效率至关重要,为探究不同泥浆和岩渣特性对岩渣排出的影响,基于CFD-DEM耦合计算方法并结合实际工程建立可以完整反映气垫舱内岩渣排出的数值计算模型,探究不同泥浆膨润土含量、岩渣直径(d)和形状系数(Sf)条件下岩渣排出规律,分析不同因素对结果影响的程度。结果表明:随着泥浆中膨润土含量从8%增加至16%时,岩渣排出率从10.0%增加至21.9%;直径大的岩渣更不易被排出,随着岩渣直径从20 mm增加至40 mm时,排出率从14.4%降低至7.9%,这归因于直径大的岩渣起动需要更高的泥浆流速;由于岩渣的滚动趋势随着形状系数的减小而降低,因此形状系数小的岩渣无法通过滚动的方式直接排出,当形状系数从1减小至0.6时,排出率降低了约59.5%。The rapid discharge of rock mucks from the air cushion chamber of a slurry balance shield machine is crucial for ensuring construction safety and improving tunneling efficiency.To explore the impact of different slurry and rock muck characteristics on rock muck discharge,a numerical calculation model that can fully reflect the dis⁃charge of rock mucks form the air cushion chamber was established based on the CFD-DEM coupling method and actual project.The study investigates the discharge patterns of rock mucks with varying bentonite content in the slurry,rock muck diameter(d),and shape factor(Sf),and analyzes the degrees of influence of these factors.The results show that as the bentonite content in the slurry increases from 8%to 16%,the rock muck discharge rate increases from 10.0%to 21.9%.Larger diameter rock mucks are more difficult to discharge;as the diameter increases from 20 mm to 40 mm,the discharge rate decreases from 14.4%to 7.9%,attributed to the higher slurry flow velocity re⁃quired to start movement of larger rock mucks.The rolling tendency of rock mucks decreases as the shape factor de⁃creases,thus rock mucks with smaller shape factors cannot be directly discharged by rolling mode.When the shape factor decreases from 1 to 0.6,the discharge rate drops by about 59.5%.The research results can provide guidance for assessing the discharge efficiency of rock mucks during slurry shield construction.

关 键 词：泥水平衡盾构 CFD-DEM 岩渣排出 膨润土泥浆 形状系数 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]