新型盾构分散剂评价装置及泥饼分解特性研究  

New Shield Dispersing Agent Evaluation Device and Mud Cake Decomposition Characteristics

作　　者：谢志恒 宋向荣[2] 宋相帅 何熊 XIE Zhiheng;SONG Xiangrong;SONG Xiangshuai;HE Xiong(CCCC Urban Investment Holding Co.,Ltd.,Guangzhou,Guangdong511458,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei430040,China;CCCC(Guangzhou)Construction Co.,Ltd.,Guangzhou,Guangdong511466,China)

机构地区：[1]中交城市投资控股有限公司,广东广州511458 [2]中交第二航务工程局有限公司,湖北武汉430040 [3]中交(广州)建设有限公司,广东广州511466

出　　处：《施工技术(中英文)》2025年第2期148-153,共6页Construction Technology

基　　金：湖北省重点研发计划项目(2023DJC007);中交集团青创项目(RP2022014214)。

摘　　要：盾构在黏性地层中掘进时,易发生堵塞,在刀盘和刀具上形成泥饼,常采用分散剂分解泥饼。为分析泥饼分解特性,以广州地区泥质粉砂岩为研究对象,研制泥饼压制装置和分解仪,通过泥饼分解试验分析分散剂和膨润土对泥饼分解的影响规律。研究表明:泥饼在水中分解分为初始阶段、快速分解阶段、稳定阶段。在初始阶段泥饼先吸水再分解,分解质量总体变化较小;在快速分解阶段,泥饼分解质量快速增大;在稳定阶段,泥饼分解质量基本不再增加。采用分散剂溶液浸泡泥饼能显著提高泥饼分解速率,分散剂浓度越高,分解速率越高,且在泥饼分解初始阶段泥饼质量不会增加。泥饼在膨润土溶液中分解时,泥饼分解质量先逐渐减小然后趋于稳定,且泥饼分解质量为负值,即泥饼质量增加,这表明膨润土的存在能显著抑制泥饼分解。When shield tunneling in viscous formations,blockage is prone to occur,resulting in the formation of mud cakes on the cutterhead and cutting tools.Dispersing agents are often used to decompose the mud cakes.To analyze the decomposition characteristics of mud cakes,taking the muddy siltstone in the Guangzhou area as the research object,a mud cake pressing device and a mud cake decomposition instrument are developed,and the influence of dispersing agent and bentonite on the decomposition of mud cakes through mud cake decomposition experiments is analyzed.Research shows that the decomposition of mud cake in water can be divided into initial stage,rapid decomposition stage,and stable stage.In the initial stage,the mud cake absorbs water first and then decomposes,the overall change in the quality of mud cake decomposition is relatively small.During the rapid decomposition stage,the quality of mud cake decomposition increases rapidly.In the stable stage,the quality of mud cake decomposition basically does not increase.Soaking the mud cake in a dispersing agent solution can significantly improve the decomposition rate of the mud cake.The higher the concentration of dispersing agent,the higher the decomposition rate of the mud cake,and the mud cake quality will not increase in the initial stage of mud cake decomposition.When the mud cake decomposes in a bentonite solution,the decomposition mass of the mud cake gradually decreases and then tends to stabilize,and the decomposition mass of the mud cake is negative,that is,the mud cake mass increases,which indicates that the presence of bentonite can significantly inhibit the decomposition of the mud cake.

关 键 词：盾构 泥饼 试验 分散剂 膨润土 分解 

分 类 号：U455[建筑科学—桥梁与隧道工程]