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Deformation control criterion of shield tunnel under lateral relaxation of soft soil

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 780-795 doi: 10.1007/s11709-023-0944-3

Abstract: However, deformation control standards for such situations have not been clearly defined.Subsequently, a deformation control criterion is established.The LRS is simulated by linearly reducing the loads applied to the lateral sides of the segment structureBased on the mechanical pattern of the segment structure and the acoustic emission, the deformation responseof a segment can be classified into three stages: elastic and quasi-elastic, damage, and rapid deformation

Keywords： shield tunnel     lateral relaxation of soil     deformation control criterion of segment structure     model    

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Deformation Rate Ratio Criterion (DRRC) and Its Verification in Maoshan Tunnel Excavation

Li Shihui,Song Jun

Strategic Study of CAE 2002, Volume 4, Issue 6,   Pages 85-91

Abstract: Advance the basis for the hypothesis of deformation rate ratio criterion (DRRC) and the method for obtainingthe threshold of this criterion, and enumerate five typical cases for the application of this criterion

Keywords： open complex giant system     cave-in accident     deformation rate ratio criterion     typical information method    

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Shield Driven Tunneling in the Complex Layer：Direction Control of Shield and Preventing Segment Crack

Tan Zhongsheng,Hong Kairong,Wan Jianglin,Wang Mengshu

Strategic Study of CAE 2006, Volume 8, Issue 12,   Pages 92-96

Abstract: So it is difficult to excavate successfully and control the tunneling direction and shield tunnelingFurthermore, it is also difficult to prevent segment crack and local failure and dislocation of segmentIn order to control the tunneling direction and shield tunneling attitude more successfully, the reasonThe main cause of segment crack and local failure of segment, were also studied with numerical simulation, and methods to control segment crack were brought forward.

Keywords： mixed ground     tunnel     attitude control     segment crack     segment dislocation    

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Study on anti crack design method for laminating crack at bottom slab in closure segment

Lin Haifeng,Zhang Dongdong and Zhao Qilin

Strategic Study of CAE 2012, Volume 14, Issue 5,   Pages 106-112

Abstract: the phenomenon of laminating crack while tensioning the pre-stressed cables at bottom slab in closure segmentcriteria under biaxial stress is more applicable to anti-crack design than the maximum tensile stress criterionfor closure segment of box girder bridges.established and the transverse and vertical stress between pre-stressed tendons at bottom slab in closure segment

Keywords： bridge engineering     bottom slab     finite element method     failure criterion     biaxial stress    

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Bending failure performance of a shield tunnel segment based on full-scale test and numerical analysis

Frontiers of Structural and Civil Engineering   Pages 1033-1046 doi: 10.1007/s11709-023-0973-y

Abstract: This study focuses on the bending failure performance of a shield tunnel segment.A full-scale test was conducted to investigate deformation and failure characteristics.little effect on the cracking load but significantly influenced the failure and ultimate loads of the segmentIt is suggested that in the reinforcement design of the subway segment, the reinforcement ratio and theuse the reinforcement and exert the design strength, thereby improving the bearing capacity of the segment

Keywords： shield tunnel     bearing capacity     failure mechanism     segment reinforcement    

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Optimization of spatial structure designs of control rod using Monte Carlo code RMC

Frontiers in Energy 2021, Volume 15, Issue 4,   Pages 974-983 doi: 10.1007/s11708-021-0769-5

Abstract: Control rod is the most important approach to control reactivity in reactors, which is currently a clusterMoreover, the lifetime of the control rod is challenged due to the high reactivity worth loss resultedmixed rod, radially moderated rod, and composite control rod with small-sized pins.The control rod worth and effective absorption cross section of these designs are computed using theFor the spatially mixed rod, rare-earth absorbers are combined with B4C in spatial structure

Keywords： control rod     optimized spatial structure     neutronic performance     burnup stability    

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PID neural network control of a membrane structure inflation system

Qiushuang LIU, Xiaoli XU

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 4,   Pages 418-422 doi: 10.1007/s11465-010-0117-7

Abstract: Because it is difficult for the traditional PID algorithm for nonlinear time-variant control objectsto obtain satisfactory control results, this paper studies a neuron PID controller.The PID controller is used to control a nonlinear time-variant membrane structure inflation system.Results show that the neural network PID controller can adapt to the changes in system structure parametersand fast track the changes in the input signal with high control precision.

Keywords： PID     neural network     membrane structure    

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Manufacturing technique and performance of functionally graded concrete segment in shield tunnel

Baoguo MA, Dinghua ZOU, Li XU

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 1,   Pages 101-104 doi: 10.1007/s11709-009-0011-8

Abstract: The quality of segment is very important to the service life of shield tunnel.functionally graded materials was introduced to design and produce the functionally graded concrete segment

Keywords： shield tunnel     functionally graded concrete segment (FGCS)     manufacturing technology     performance    

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A redundantly actuated PRPRP radial mechanism in the segment erector of a shield machine for synchronizationcontrol

Wanghui BU, Zhenyu LIU, Jianrong TAN, Jin CHENG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 4,   Pages 463-467 doi: 10.1007/s11465-011-0225-z

Abstract:

The shield machine is a heavy construction machine for tunnel excavation, and the segment erectorIt is difficult to achieve precise control in the 6-DOF (degree of freedom) erector in the 2-DOF 5-barHence, this paper proposes a redundantly actuated PRPRP radial mechanism for the segment erector.synchronization of the two driving hydraulic cylinders along the radial direction based on the mechanical structure

Keywords： redundant actuation     parallel mechanisms     five-bar mechanisms     segment erectors     shield machines    

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Drive system design and error analysis of the 6 degrees of freedom segment erector of shield tunneling

Hu SHI, Guofang GONG, Huayong YANG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 369-376 doi: 10.1007/s11465-011-0223-1

Abstract:

Focusing on a segment erector of a shield-tunneling machine developed with 6 degrees of freedom (DOF) and controlled by electro-hydraulic proportional systems, the kinematics of the segment erection processthe position and attitude error model, considering a number of factors such as the hydraulic drive, controlFormulas for calculating the position and attitude error of the grip hand of the segment erector areerror analysis, providing a foundation for practical designing, manufacturing, and assembling of the segment

Keywords： shield tunneling machine     segment erector     kinematics     position and attitude precision    

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Vibration control of a structure using Magneto-Rheological grease damper

Shinya SUGIYAMA, Tomoki SAKURAI, Shin MORISHITA

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3,   Pages 261-267 doi: 10.1007/s11465-013-0268-4

Abstract:

This paper describes an application study of Magneto-Rheological (MR) grease damper to a structureFurthermore, vibration response of a three-story model structure equipped with MR grease damper was investigated

Keywords： vibration control     damper     smart material     Magneto-Rheological (MR) grease     MR fluid    

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Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Strategic Study of CAE 2006, Volume 8, Issue 10,   Pages 66-70

Abstract:

The closed-loop feedback structure of PID generalized predictive control (PID - GPC) is proposed,then small-gain criterion is used to obtain a sufficient condition for the robust stability of PID -

Keywords： predictive control     robustness     frequency domain     small-gain criterion     PID control    

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The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1200-1213 doi: 10.1007/s11709-019-0546-2

Abstract: Special attention is paid to failure mode and structural performance (bearing capacity, deformation,Moreover, segment joints with MSSF are also tested to evaluate the effects of MSSF on the failure modeand structural performance of the segment joints.A \ /-type crack pattern is always observed before the final failure of the segment joints.The segment joint with MSSF shows higher ultimate bearing capacity and toughness compared to segment

Keywords： shield tunneling     structural synthetic fiber concrete     hand hole     segment joint     ultimate bearing capacity    

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Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 478-490 doi: 10.1007/s11709-015-0317-7

Abstract: This paper presents a simple and efficient approach for predicting the plastic limit loads in cracked plane-strain structures. We use two levels of mesh repartitioning for the finite element limit analysis. The master level handles an adaptive primal-mesh process through a dissipation-based indicator. The slave level performs the subdivision of each triangle into three sub-triangles and constitutes a dual mesh from a pair of two adjacent sub-triangles shared by common edges of the primal mesh. Applying a strain smoothing projection to the strain rates on the dual mesh, the incompressibility constraint and the flow rule constraint are imposed over the edge-based smoothing domains and everywhere in the problem domain. The limit analysis problem is recast into the compact form of a second-order cone programming (SOCP) for the purpose of exploiting interior-point solvers. The present method retains a low number of optimization variables. It offers a convenient way for designing and solving the large-scale optimization problems effectively. Several benchmark examples are given to show the simplicity and effectiveness of the present method.

Keywords： cracked structure     limit analysis     von Mises criterion     edge-based strain smoothing     second-order cone programming    

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Experimental research on ductile fracture criterion in metal forming

Song YU, Weiming FENG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 308-311 doi: 10.1007/s11465-011-0233-z

Abstract:

Ductile fracture criterion is key limitation parameter in material forming.Accuracy predicting surface and internal failure in plastic deformation process affects on the technologyproviding the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion

Keywords： ductile fracture criteria     metal forming process     material experiment     stress triaxiality    

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Title Author Date Type Operation

Deformation control criterion of shield tunnel under lateral relaxation of soft soil

Journal Article

Deformation Rate Ratio Criterion (DRRC) and Its Verification in Maoshan Tunnel Excavation

Li Shihui,Song Jun

Journal Article

Shield Driven Tunneling in the Complex Layer：Direction Control of Shield and Preventing Segment Crack

Tan Zhongsheng,Hong Kairong,Wan Jianglin,Wang Mengshu

Journal Article

Study on anti crack design method for laminating crack at bottom slab in closure segment

Lin Haifeng,Zhang Dongdong and Zhao Qilin

Journal Article

Bending failure performance of a shield tunnel segment based on full-scale test and numerical analysis

Journal Article

Optimization of spatial structure designs of control rod using Monte Carlo code RMC

Journal Article

PID neural network control of a membrane structure inflation system

Qiushuang LIU, Xiaoli XU

Journal Article

Manufacturing technique and performance of functionally graded concrete segment in shield tunnel

Baoguo MA, Dinghua ZOU, Li XU

Journal Article

A redundantly actuated PRPRP radial mechanism in the segment erector of a shield machine for synchronizationcontrol

Wanghui BU, Zhenyu LIU, Jianrong TAN, Jin CHENG

Journal Article

Drive system design and error analysis of the 6 degrees of freedom segment erector of shield tunneling

Hu SHI, Guofang GONG, Huayong YANG

Journal Article

Vibration control of a structure using Magneto-Rheological grease damper

Shinya SUGIYAMA, Tomoki SAKURAI, Shin MORISHITA

Journal Article

Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Journal Article

The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

Journal Article

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Journal Article

Experimental research on ductile fracture criterion in metal forming

Song YU, Weiming FENG

Journal Article