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Calculation method for the formation time of dynamic filter cake in slurry shield tunneling

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FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING 2024年第9期18卷 1337-1349页

作者： Yang, Yinzun Yuan, Dajun Du, Changyan Jin, Dalong Hao, Jun Beijing Jiaotong Univ Key Lab Minist Educ Urban Underground Engn Minist Educ Beijing 100044 Peoples R China Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China Mega Shield Engn co ltd China Railway Bur Grp 14 Nanjing 211800 Peoples R China

In slurry shield tunneling, the stability of tunnel face is closely related to the filter cake. The cutting of the cutterhead has negative impact on the formation of filter cake. This study focuses on the formation time of dynamic filter cake considering the filtration effect and rotation of cutterhead. Filtration effect is the key factor for slurry infiltration. A multilayer slurry infiltration experiment system is designed to investigate the variation of filtrate rheological property in infiltration process. Slurry mass concentration CL, soil permeability coefficient k, the particle diameter ratio between soil equivalent grain size and representative diameter of slurry particles d(10)/D-85 are selected as independent design variables to fit the computational formula of filtration coefficient. Based on the relative relation between the mass of deposited particles in soil pores and infiltration time, a mathematical model for calculating the formation time of dynamic filter cake is proposed by combining the formation criteria and formation rate of external filter cake. The accuracy of the proposed model is verified through existing experiment data. Analysis results show that filtration coefficient is positively correlated with slurry mass concentration, while negatively correlated with the soil permeability coefficient and the particle diameter ratio between soil and slurry. As infiltration distance increases, the adsorption capacity of soil skeleton to slurry particles gradually decreases. The formation time of external filter cake is significantly lower than internal filter cake and the ratio is approximately 3.9. Under the dynamic cutting of the cutterhead, the formation time is positively associated with the rotation speed of cutter head, while negatively with the phase angle difference between adjacent cutter arm. The formation rate of external filter cake is greater than 98% when d(10)/D-85 content or decreasing the diameter size

关键词： slurry infiltration filtration coefficient dynamic filter cake formation time rotation speed phase angle FACE STABILITY INFILTRATION SUSPENSIONS FILTRATION PARTICLES PRESSURE WATER FLOW

The Undersea Tunnel on Qingdao Metro Line 8

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Engineering 2018年第2期4卷 3-5页

作者： Weiguo He Peng Liu china railway liuyuan Group co. Ltd. Tianjin 300133 China

With a full length of 60.7 kin, Qingdao Metro Line 8 runs from Jiaozhou North railway Station in Jiaozhou City to Wusi Square in Shinan District. It has 15 stations in total, a type B six-car formation, and a maximum traveling speed of 120 km·h -1. Qingdao Metro Line 8 links the new Qingdao Station on the Jinan-Qingdao High-Speed railway with Qingdao Station on the QingdaoLianyungang railway; connects large traffic terminals such as Jiaozhou North railway Station, Qingdao Jiaodong International Airport, Qingdao North railway Station, and Wusi Square.

关键词：地铁工程施工施工管理中国

四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术研究

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中南大学学报:英文版 2023年第7期30卷 2360-2373页

作者：雷明锋石渊博唐钱龙孙宁新唐志辉龚琛杰 School of Civil Engineering Central South UniversityChangsha 410075China Key Laboratory of Engineering Structure of Heavy Haul railway Changsha 410075China Shandong Provincial communications Planning and Design Institute Group co. Ltd.Jinan 250031China china railway liuyuan Group co. Ltd.Tianjin 300308China

在密集的城市建筑环境中,在城市地下交通的大规模兴建过程中不可避免地会出现各类近接施工工程。依托一实际工程,针对四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术开展实践研究,总结提出了“两阶段法理论预测+主动控制与被动保... 详细信息

在密集的城市建筑环境中,在城市地下交通的大规模兴建过程中不可避免地会出现各类近接施工工程。依托一实际工程,针对四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术开展实践研究,总结提出了“两阶段法理论预测+主动控制与被动保护”的近接施工微扰动控制技术体系。该技术体系的核心内容包括:1)通过引入附加地层损失率,建立多线隧道近接施工时桩基变形的理论计算方法,实现近接施工对邻近建(构)筑物影响的工前预测。2)建立隧道-地层-桩基多元耦合模型,分析四线交叠盾构隧道施工全过程力学行为。3)结合工程实践经验,分别从主动控制和被动保护两方面提出依托工程的控制措施。在依托工程开挖完成过程中,邻近桥梁桩基变形得到有效控制,表明所提出的近接施工微扰动控制技术是合理可行的。

关键词：盾构隧道桥梁桩基下穿施工主动控制被动保护

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control of Sulfur content in the Production of Clean Steel in Panzhihua Steel

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Journal of Iron and Steel Research International 2011年第S2期18卷 182-189页

作者： YANG Sen-xiang ( Panzhihua Steel & vanadium co., ltd., PanGang Group, Panzhihua 617060, S ichuan, china) Panzhihua Steel & Vanadium co ltd PanGang Grp Panzhihua 617060 Sichuan Peoples R China

This article mainly introduced the process of clean steel with different ways in Panzhihua Steel based on high sulfur content hot metal. With the development and application of sulfur control technologies in hot metal pretreatment, converter steel-making and refining processes, Panzhihua Steel had achieved the production of clean steel such as 350km/h steel for high speed railway, electric steel, etc.

关键词： clean steel sulfur control high speed rail steel electric steel

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青岛地铁8号线海底隧道

Engineering 2018年第2期 11-16页

作者：贺维国刘鹏 china railway liuyuan Group co. Ltd.

1.工程概况青岛地铁8号线线路全长60.7 km,起点为胶州市胶州北站,终点为市南区五四广场,共设站15座,采用B型车6辆编组,最高行车速度为120 km·h–1。它连接新建的济青高铁青岛站、青连铁路青岛站,一路串起胶州北站、胶东国际机场、青岛... 详细信息

1.工程概况青岛地铁8号线线路全长60.7 km,起点为胶州市胶州北站,终点为市南区五四广场,共设站15座,采用B型车6辆编组,最高行车速度为120 km·h–1。它连接新建的济青高铁青岛站、青连铁路青岛站,一路串起胶州北站、胶东国际机场、青岛火车北站、五四广场等大型客流集散点,沿途经过胶州市、红岛经济区、李沧区、市北区、市南区等5个行政区或功能区,是连

关键词：海底隧道施工段青岛地铁带压进仓矿山法盾构施工

The signature analysis of summer Antarctic sea-ice distribution by ship-based sea-ice observation

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Research in cold and Arid Regions 2009年第4期1卷 300-306页

作者： ShuLin Tang 1,Ning Li 1,AnNan Jiang 2,XingRu Zhou 1 1.china railway 21st Bureau Group co.,ltd,Lanzhou 730000,china.2.Institute of Highway and Bridge,Dalian Maritime University,Dalian 116026,china. china railway 21st Bur grp co ltd Lanzhou 730000 Peoples R China Dalian Maritime Univ Inst Highway & Bridge Dalian 116026 Peoples R China

Based on the Chinese 19th National Antarctic Research Expedition,we carried out ship-based Antarctic sea-ice observa-tion on icebreaker Xue Long using Antarctic sea-ice process and climate (ASPeCt) criteria during austral ***-ice distribution data were obtained along nearly 6,500 km of the ship’s *** measurement parameters included sea-ice thickness,sea-ice concentration,snow thickness,and floe *** showed the presence of the large spatial varia-tions of the observed sea-ice ***-ice concentration varied between 0 and 80 percent and reached its peak value in Weddell Sea because of the specific dynamical process affecting in summer sea-ice *** are large areas of open water along the study *** ice and the upper snow thickness of the section varied between 10 cm and 210 cm and 2 cm and 80 cm,respectively,and each reaches its peak values near Amery ice *** floe size varied from less than 10 cm and the maximum of more than 2,000 km along the section.

关键词： Antarctic sea ice ship-based observation

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Overview of Design and construction Points Analysis for the Rotating continuous Girder Bridge

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Journal of Architectural Research and Development 2023年第5期7卷 86-94页

作者： Shuxue Zhang china railway liuyuan Group co. Ltd.Tianjin 300308China

With the advancement of the economy,the construction of roads and bridges has assumed a crucial role in the development of china’s highway transportation *** interplay between the design and construction technologies of road bridges is pivotal,as it directly impacts the subsequent operation and maintenance *** the design and construction techniques for continuous girder transitions have been progressively improving,challenges still *** paper takes the example of the continuous girder design for the T-structure(75 m+75 m)of the Xintai Highway Crossing Yanzhou-Shijiusuo railway Separation Interchange Project and delves into an analysis of the structural design calculations for the bridge transition,the transition structure’s design,and critical considerations during *** findings presented here can serve as a valuable reference for similar project designs.

关键词： Bridge design continuous girder Transformer bridge