Effect of the nozzle structure of the large-diameter slurry shield cutterhead on the scouring characteristics

2020 ◽  
Vol 42 (4) ◽  
Author(s):  
Xuemeng Xiao ◽  
Yimin Xia ◽  
Xintong Mao ◽  
Yang Wang ◽  
Zhongyu Fang ◽  
...  
Keyword(s):  
Large Diameter ◽  
Slurry Shield ◽  
Nozzle Structure

Pile and pile group response to tunnelling using a large diameter slurry shield – Case study in Shanghai

2014 ◽  
Vol 59 ◽  
pp. 21-43 ◽  
Author(s):  
Chao Liu ◽  
Zixin Zhang ◽  
Richard A. Regueiro
Keyword(s):  
Large Diameter ◽  
Pile Group ◽  
Group Response ◽  
Slurry Shield

scholarly journals Realization of Super-Large-Diameter Slurry Shield Passing through Settlement-Sensitive Area Based on Unreinforced Disturbance Control Technology

2022 ◽  
Vol 2022 ◽  
pp. 1-9
Author(s):  
Dongshuang Liu ◽  
Xinrong Liu ◽  
Zuliang Zhong ◽  
Yafeng Han ◽  
Fei Xiong ◽  
...  
Keyword(s):  
Water Pressure ◽  
Large Diameter ◽  
High Density ◽  
Control Technology ◽  
Construction Process ◽  
Sensitive Areas ◽  
Excavation Process ◽  
Complex Construction ◽  
Slurry Shield ◽  
Subway Tunnels

Due to the complex construction conditions of shield tunnels, ground disturbance is inevitable during the construction process, which leads to surface settlement and, in serious cases, damage to surrounding buildings (structures). Therefore, it is especially important to effectively control the constructive settlement of subway tunnels when crossing settlement-sensitive areas such as high-density shantytowns. Based on the project of Wuhan Metro Line 8 Phase I, the shield of Huangpu Road Station-Xujiapang Road Station interval crossing high-density shantytowns, we study the disturbance control technology of oversized diameter mud and water shield crossing unreinforced settlement-sensitive areas during the construction process. By optimizing the excavation parameters and evaluating the ground buildings, the excavation process can be monitored at the same time, and the water pressure, speed, and tool torque required during the excavation during the construction process can be finely adjusted; the control of tunneling process parameters can provide reference and basis for analyzing the construction control of large-diameter shield through old shantytowns.

scholarly journals Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large-Diameter Slurry Shield Tunneling

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Lei Kou ◽  
Jinjie Zhao ◽  
Fanglei Lian ◽  
Ronghu Miao
Keyword(s):  
Fractal Dimension ◽  
Large Diameter ◽  
Test Results ◽  
Shield Tunneling ◽  
Mud Cake ◽  
Filtration Loss ◽  
Pore Area ◽  
Mud Filtration ◽  
Slurry Shield ◽  
Penetration Tests

Multiple soil layers may be exposed simultaneously on the excavated surface of a large-diameter slurry shield. To study the formation and characteristics of mud filtration cake on the excavation surface during large-diameter slurry shield tunneling, penetration tests of mud slurries in different soils were carried out using a self-made device, and the microstructures of different mud filtration cakes were observed using scanning electron microscopy. The test results showed that there were three categories of filling forms for mud slurries permeating the soils: mud filtration cake, mud cake + permeation zone, and permeation zone; correspondingly, there were three types of filtration loss, which was mainly affected by the specific gravity of mud slurry. Finally, the porosity and the fractal dimension for the pore area of the mud filtration cake were calculated, and it is found that the fractal dimension of pore area is beneficial to classify the type of mud filtration cake.

The Analysis of Stratum Settlement for a Large Diameter Slurry Shield Obliquely Under-Passing Embankment of the Yangtze River

2014 ◽  
Vol 919-921 ◽  
pp. 895-901 ◽  
Author(s):  
Zhou Yun Jiang ◽  
Jie Yu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Yangtze River ◽  
Large Diameter ◽  
Three Dimensional ◽  
The Yangtze River ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Slurry Shield ◽  
Element Method

Displacement caused by tunnel excavation soil may cause the deformation of the buildings or structures nearby and even cause disaster. On the background of a large diameter slurry shield obliquely Under-passing embankment of The Yangtze River. First of all, three dimensional finite element method is used to make a dynamic analysis of the embankment settlement. And the result is compared with the measured values, the accuracy of the finite element method was verified. Then, the stratum settlement of embankment is analyzed under different cross Angle and depth of tunnel. Some useful conclusions are drawn, which can provide some useful reference for similar engineering of tunnel under-passing embankment.

scholarly journals Risk Analysis and Control Measures for Slurry Shield Tunneling Diagonally under an Urban River Embankment

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yu Liang ◽  
Xiangyu Chen ◽  
Junsheng Yang ◽  
Linchong Huang
Keyword(s):  
Large Diameter ◽  
Fine Sand ◽  
Urban River ◽  
Control Measures ◽  
Additional Stress ◽  
Shield Tunneling ◽  
Cross River ◽  
Sand Stratum ◽  
Slurry Shield ◽  
River Embankment

The construction of urban cross-river tunnels usually requires passing under river embankments, which inevitably disturbs the embankment substratum and causes ground deformation. Previous engineering cases have shown that embankment settlement is greater than ordinary surface settlement and that uneven settlement results in cracks of in the embankment, reducing the embankment stability. Based on a cross-river tunnel project in China, the construction risks caused by the additional stress on the embankment substratum, asymmetrical embankment load, and shield tunneling in saturated fine sand are analyzed during a large-diameter slurry shield tunneling below an urban river embankment diagonally. Additionally, relevant risk control measures, such as slurry pressure, jacking thrust setting, and driving velocity in the saturated fine sand stratum, are evaluated. The results show that during shield tunneling under a diagonal urban river embankment, the additional stress and asymmetrical load effects should be considered, and the shield slurry pressure and jacking thrust should be adjusted according to the distance between the cutter head and the embankment. Furthermore, based on settlement monitoring data, the driving velocity of the shield should be reasonably adjusted in a timely manner to avoid disturbing the fine sand stratum below the embankment.

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