An Empirical Estimation of Settlement-Time Relationship Due to Shield Tunneling in Gravelly Soils

2018 ◽  
pp. 310-322
Author(s):  
Yung-Show Fang ◽  
Lin-Yao Kuo ◽  
Chuo-Ming Lin ◽  
Ying-Chu Shih
Keyword(s):  
Empirical Estimation ◽  
Shield Tunneling ◽  
Time Relationship ◽  
Gravelly Soils ◽  
Settlement Time

Case Study of Long-Term Ground Settlements Induced by Slurry Shield Tunnelling

2011 ◽  
Vol 243-249 ◽  
pp. 3078-3081 ◽  
Author(s):  
Cun Gang Lin ◽  
Zhong Miao Zhang ◽  
Shi Ming Wu
Keyword(s):  
Careful Analysis ◽  
Soft Ground ◽  
Road Tunnel ◽  
Shield Tunneling ◽  
Shield Tunnelling ◽  
Slurry Shield ◽  
Settlement Time ◽  
Ground Settlements

The Qing-chun Road Cross-river Tunnel is the first road tunnel under the Qiantang River in Hangzhou, and it is also the first experiences of slurry shield tunnelling in Hangzhou soft ground. In order to ensure the safety of construction and reduction of environmental impacts while shield tunnelling, a comprehensive monitoring system was carried out during construction, which included ground settlements, displacements and deformations of installed linings and so on. In this paper, the long-term ground settlements induced by slurry shield tunnelling were described in detail, and careful analysis of monitoring ground settlements was made. This case study shows that: 1. The surface transverse consolidation settlements do not follow the Gaussian curve; usually the largest settlements exist above the centerline of the tunnel or nearby, from where settlements descend outwards. Due to consolidation, the surface settlement troughs widen with time.2. Shield tunneling in soft ground, the turning point in settlement-time curves or settlement rate-time curves can be chosen as the time divides the immediate and long-term consolidation settlements.

Surface Settlement Time Lag Induced by Shield Tunneling in Urban Sandy-Pebble Stratum

2013 ◽  
Vol 405-408 ◽  
pp. 1326-1329 ◽  
Author(s):  
Shuai Man
Keyword(s):  
Time Lag ◽  
Surface Settlement ◽  
Ground Settlement ◽  
Shield Tunneling ◽  
Segmental Lining ◽  
Settlement Time ◽  
Surface Collapse

This paper focuses on the surface settlement time lag caused by shield tunneling in sandy-pebble stratum in Chengdu. A surface collapse case during Chengdu metro construction was introduced and the mechanism of surface settlement time lag was analyzed. The process of the ground settlement was simulated using the UDEC software. It is found that: 1) over-excavation and the grouting failure are the root causes of surface settlement; 2) characteristics of the sandy-pebble stratum in Chengdu induce ground voids behind tunnel segmental lining; 3) the mechanism of surface settlement time lag can be explained by temporary ground arch in the sandy-pebble stratum.

scholarly journals Ground settlement due to shield tunneling through gravelly soils in Hsinchu

2016 ◽  
Vol 2 (42) ◽  
pp. 1501-1506
Author(s):  
Yung-Show Fang ◽  
Chuo-Ming Lin ◽  
Cheng Liu
Keyword(s):  
Ground Settlement ◽  
Shield Tunneling ◽  
Gravelly Soils

TIME RELATIONSHIP AND TRANSMISSION MODALITY IN A LEARNING TASK INVOLVING WORD-OBJECT PAIRS

1966 ◽  
Vol 23 (2) ◽  
pp. 615-622 ◽  
Author(s):  
DONALD J. MUELLER ◽  
ADRIAN P. VAN MONDFRANS ◽  
ADRIAN CHAN ◽  
ROBERT M. W. TRAVERS
Keyword(s):  
Learning Task ◽  
Time Relationship

scholarly journals A modular design method based on TRIZ and AD and its application to cutter changing robot

2021 ◽  
Vol 13 (7) ◽  
pp. 168781402110343
Author(s):  
Mei Yang ◽  
Yimin Xia ◽  
Lianhui Jia ◽  
Dujuan Wang ◽  
Zhiyong Ji
Keyword(s):  
Modular Design ◽  
Design Method ◽  
Idea Generation ◽  
Design Parameters ◽  
Problem Analysis ◽  
Concept Design ◽  
Functional Requirements ◽  
Shield Tunneling ◽  
Structural Hierarchy ◽  
And Performance

Modular design, Axiomatic design (AD) and Theory of inventive problem solving (TRIZ) have been increasingly popularized in concept design of modern mechanical product. Each method has their own advantages and drawbacks. The benefit of modular design is reducing the product design period, and AD has the capability of problem analysis, while TRIZ’s expertise is innovative idea generation. According to the complementarity of these three approaches, an innovative and systematic methodology is proposed to design big complex mechanical system. Firstly, the module partition is executed based on scenario decomposition. Then, the behavior attributes of modules are listed to find the design contradiction, including motion form, spatial constraints, and performance requirements. TRIZ tools are employed to deal with the contradictions between behavior attributes. The decomposition and mapping of functional requirements and design parameters are carried out to construct the structural hierarchy of each module. Then, modules are integrated considering the connections between each other. Finally, the operation steps in application scenario are designed in temporal and spatial dimensions. Design of cutter changing robot for shield tunneling machine is taken as an example to validate the feasibility and effectiveness of the proposed method.

scholarly journals Synchronization Control of a Dual-Cylinder Lifting Gantry of Segment Erector in Shield Tunneling Machine under Unbalance Loads

Machines ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 152
Author(s):  
Litong Lyu ◽  
Xiao Liang ◽  
Jingbo Guo
Keyword(s):  
Motion Tracking ◽  
Adaptive Robust Control ◽  
Synchronization Control ◽  
Small Range ◽  
Linear Motion ◽  
Shield Tunneling ◽  
Rotational Angle ◽  
High Level ◽  
Unbalanced Loads ◽  
Segment Erector

Segment assembling is one of the principle processes during tunnel construction using shield tunneling machines. The segment erector is a robotic manipulator powered by a hydraulic system to assemble prefabricated concrete segments onto the excavated tunnel surface. Nowadays, automation of the segment erector has become one of the definite developing trends to further improve the efficiency and safety during construction; thus, closed-loop motion control is an essential technology. Within the segment erector, the lifting gantry is driven by dual cylinders to lift heavy segments in the radial direction. Different from the dual-cylinder mechanism used in other machines such as forklifts, the lifting gantry usually works at an inclined angle, leading to unbalanced loads on the two sides. Although strong guide rails are applied to ensure synchronization, the gantry still occasionally suffers from chattering, “pull-and-drag”, or even being stuck in practice. Therefore, precise motion tracking control as well as high-level synchronization of the dual cylinders have become essential for the lifting gantry. In this study, a complete dynamics model of the dual-cylinder lifting gantry is constructed, considering the linear motion as well as the additional rotational motion of the crossbeam, which reveals the essence of poor synchronization. Then, a two-level synchronization control scheme is synthesized. The thrust allocation is designed to coordinate the dual cylinders and keep the rotational angle of the crossbeam within a small range. The motion tracking controller is designed based on the adaptive robust control theory to guarantee the linear motion tracking precision. The theoretical performance is analyzed with corresponding proof. Finally, comparative simulations are conducted and the results show that the proposed scheme achieves high-precision motion tracking performance and simultaneous high-level synchronization of dual cylinders under unbalanced loads.

Design and dimension optimization of cutter disassembly mechanism for shield tunneling machine

2021 ◽  
Author(s):  
Yimin Xia ◽  
Mei Yang ◽  
Zhiyong Ji ◽  
Lianhui Jia ◽  
Zixiong Zhou ◽  
...  
Keyword(s):  
Shield Tunneling ◽  
Shield Tunneling Machine ◽  
Tunneling Machine
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