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Driving force planning in shield tunneling based on Markov decision processes

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Science China(Technological Sciences) 2012年第4期55卷 1022-1030页

作者： HU XiangTao HUANG YongAn YIN ZhouPing XIONG YouLun State Key Laboratory of Digital Manufacturing Equipment&Technology Huazhong University of Science&TechnologyWuhan 430074China

In shield tunneling, the control system needs very reliable capability of deviation rectifying in order to ensure that the tunnel trajectory meets the permissible criterion. To this goal, we present an approach that adopts Markov decision process (MDP) theory to plan the driving force with explicit representation of the uncertainty during excavation. The shield attitudes of possi- ble world and driving forces during excavation are scattered as a state set and an action set, respectively. In particular, an evaluation function is proposed with consideration of the stability of driving force and the deviation of shield attitude. Unlike the deterministic approach, the driving forces based on MDP model lead to an uncertain effect and the attitude is known only with an imprecise probability. We consider the case that the transition probability varies in a given domain estimated by field data, and discuss the optimal policy based on the interval arithmetic. The validity of the approach is discussed by comparing the driving force planning with the actual operating data from the field records of Line 9 in Tianjin. It is proved that the MDP model is reasonable enough to predict the driving force for automatic deviation rectifying.

关键词： shield tunneling Markov decision process automatic deviation rectifying interval arithmetic driving force planning

Risks analysis of large diameter slurry shield tunneling in urban area

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Underground Space 2023年第6期13卷 281-300页

作者： Yi Zeng Pierre Guy Atangana Njock Wang Xiong Xiao-Long Zhang Shui-Long Shen Shanghai Tunnel Engineering&Rail Transit Design and Research Institute Shanghai 200235China Department of Civil and Environmental Engineering College of EngineeringShantou UniversityShantouGuangdong 515063China MOE Key Laboratory of Intelligence Manufacturing Technology Department of Civil and Environmental EngineeringCollege of EngineeringShantou UniversityShantouGuangdong 515063China

The construction of super-large tunnels generates various safety risks that can hamper the tunneling process and cause severe damages if not properly *** paper presents a case study on the identification and management of geological and environmental risks during the construction of the largest(a diameter of 15.8 m)slurry shield tunnel in *** ground conditions and settlement control were identified among the most challenging owing to a large area of mixed ground conditions,11 fault zones and tunneling under residential areas and the city’s Metro Lines 1 and *** response to the severity of these risks and challenges,novel monitoring systems,ground treatment,and safety management technologies were successfully implemented throughout the tunneling ***,a technical framework was proposed in this study to serve as a risk management guidance for analogous tunneling operations.

关键词： Large diameter Risks shield tunneling Fault zones Geohazard mitigation

Numerical study on 3D effect and practical design in shield tunneling

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Underground Space 2019年第3期4卷 201-209页

作者： Hossain Md.Shahin Teruo Nakai Tetsuo Okuno Islamic University of Technology GazipurBangladesh Geo-Research Institute Japan Nagoya Institute of Technology NagoyaJapan Shimizu Corporation TokyoJapan

In practice,different design methods are used in solving geotechnical problems depending on the type of issue such as the tunneling,braced excavation,or bearing capacity of a foundation,that is,the basic mechanism of the design method differs depending on the problems even for the same ground.A numerical analysis using the finite element method has recently become familiar owing to an improved computing performance;however,it is not widely used in the design of geotechnical problems including tunnel excavation owing to the reliability of the constitutive model of the ground *** a constitutive model of soils can properly express the properties of the ground material,a numerical analysis will play a vital role in solving the geotechnical *** this paper,the current state of a numerical analysis and its applicability in tunnel design are ***,the simulation of the ground behavior during tunnel excavation is carried out using sandy and clay ground parameters for shallow and deep tunnel *** paper is mainly focused on the effects of tunnel excavation under three-dimensional(3D)conditions,as well as the current design ***-linear 2D and 3D finite element analyses have been conducted,in which the elastoplastic sub-loading tij model has been used as a constitutive model of the *** performance and acceptability of the constitutive model have already been proven to reproduce the results of various model tests on different geotechnical problems such as the tunneling,braced excavation,and bearing capacity of a foundation,as well as the measured field *** was found that a 2D finite element analysis where the rate of stress release is considered,can be used for the prediction of the ground deformation and surface settlement;however,it does not provide rational information in the prediction of tunnel lining forces such as the stress,bending moment,and axial force,which emphasize the necessity of a 3D analysis with a proper cons

关键词： shield tunneling Finite element analysis 3D effect

On the critical particle size of soil with clogging potential in shield tunneling

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 477-485页

作者： Shuying Wang Zihao Zhou Pengfei Liu Zhao Yang Qiujing Pan Weizhong Chen School of Civil Engineering Central South UniversityChangsha410075China CCCC Second Harbor Engineering Company Ltd. Wuhan430040China Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhan430071China

shield tunneling is easily obstructed by clogging in clayey strata with small soil ***,soil clogging rarely occurs in strata with coarse-grained ***,a critical particle size of soils should exist,below which there is a high risk of soil clogging in shield *** determine the critical particle size,a series of laboratory tests was carried out with a large-scale rotary shear apparatus to measure the tangential adhesion strength of soils with different particle sizes and water *** was found that the tangential adhesion strength at the soilesteel interface gradually increased linearly with applied normal *** the particle size of the soil specimen was less than 0.15 mm,the interfacial adhesion force first increased and then decreased as the water content gradually increased;otherwise,the soil specimens did not manifest any interfacial adhesion *** amount of soil mass adhering to the steel disc was positively correlated with the interfacial adhesion force,thus the interfacial adhesion force was adopted to characterize the soil clogging risk in shield *** critical particle size of soils causing clogging was determined to be 0.15 ***,the generation mechanism of interfacial adhesion force was explored for soils with different particle sizes to explain the critical particle size of soil with clogging risk in shield tunneling.

关键词： shield tunneling Soil clogging Adhesion Critical particle size

Parameter identification and pressure control of dynamic system in shield tunneling using least squares method

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Journal of Coal Science & Engineering(China) 2010年第3期16卷 256-261页

作者： LI Shou-ju CAO Li-juan SHANGGUAN Zi-chang LIU Bo State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Institute of Mechanical Engineering Dalian Ocean University Dalian 116024 China

An estimation approach using least squares method was presented for identificationof model parameters of pressure control in shield *** state equation ofthe pressure control system for shield tunneling was analytically derived based on themass equilibrium principle that the entry mass of the pressure chamber from cutting headwas equal to excluding mass from the screw *** randomly observed noise wasnumerically simulated and mixed to simulated observation values of system *** numerical simulation shows that the state equation of the pressure control system forshield tunneling is reasonable and the proposed estimation approach is effective even ifthe random observation noise *** robustness of the controlling procedure is validatedby numerical simulation results.

关键词： parameter identification least squares method state equation shield tunneling

Experimental study on the pressure control of soil chamber in shield tunneling

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Journal of Coal Science & Engineering(China) 2013年第3期19卷 414-420页

作者： Qiang ZHANG Shou-Ju LI Li-Juan CAO Institute of Mechanical Engineering Liaoning Technical University Fuxin 123000 China State Key Lab. of Structural Analysis of Industrial Equipment Dalian University of Technology Dalian 116024 China China National Coal Mining Equipment Co. Ltd. Beijing 100011 China Institute of Mechanical Engineering Dalian Ocean University Dalian 116023 China

A mathematical model of the soil pressure system in shield tunneling was proposed to optimize soil pressure control in the soil chamber, based on the constitutive relationship between strain and stress. The desired pressure is determined by using the finite element method. A linear quadratic constant state tracking problem was considered over an infinite time interval. The optimal control law was derived by differentiating the Hamilton function with respect to system input. In order to verify the effectiveness of the proposed mathematical model and optimal control law, an experimental study on the pressure control of the soil chamber in shield tunneling was conducted in a laboratory. The experiment results show that soil pressure in the soil chamber in shield tunneling can be accurately controlled.

关键词： optimal control soil pressure shield tunneling mathematical model experimental investigation

Prediction of Disc Cutter Life During shield tunneling with AI via the Incorporation of a Genetic Algorithm into a GMDH-Type Neural Network

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Engineering 2021年第2期7卷 238-251页

作者： Khalid Elbaz Shui-Long Shen Annan Zhou Zhen-Yu Yin Hai-Min Lyu Department of Civil and Environmental Engineering College of EngineeringShantou UniversityShantou 515063China Key Laboratory of Intelligence Manufacturing Technology Ministry of EducationShantou UniversityShantou 515063China Discipline of Civil and Infrastructure School of EngineeringRoyal Melbourne Institute of TechnologyMelbourneVIC 3000Australia Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Internet of Things for Smart City University of MacaoMacaoChina

Disc cutter consumption is a critical problem that influences work performance during shield tunneling processes and directly affects the cutter change *** study proposes a new model to estimate the disc cutter life(Hf)by integrating a group method of data handling(GMDH)-type neural network(NN)with a genetic algorithm(GA).The efficiency and effectiveness of the GMDH network structure are optimized by the GA,which enables each neuron to search for its optimum connections set from the previous *** the proposed model,monitoring data including the shield performance database,disc cutter consumption,geological conditions,and operational parameters can be *** verify the performance of the proposed model,a case study in China is presented and a database is adopted to illustrate the excellence of the hybrid *** results indicate that the hybrid model predicts disc cutter life with high *** sensitivity analysis reveals that the penetration rate(PR)has a significant influence on disc cutter *** results of this study can be beneficial in both the planning and construction stages of shield tunneling.

关键词： Disc cutter life shield tunneling Operational parameters GMDH-GA

Machine learning-based automatic control of tunneling posture of shield machine

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1153-1164页

作者： Hongwei Huang Jiaqi Chang Dongming Zhang Jie Zhang Huiming Wu Gang Li Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghaiChina Department of Geotechnical Engineering Tongji UniversityShanghaiChina Shanghai Tunnel Engineering Co. Ltd.ShanghaiChina

For a tunnel driven by a shield machine,the posture of the driving machine is essential to the construction quality and environmental ***,the machine posture is controlled by the experienced driver of shield machine by setting hundreds of tunneling parameters *** learning(ML)algorithm is an alternative method that can let the computer to learn from the driver’s operation and try to model the relationship between parameters ***,in this paper,three ML algorithms,***-layer perception(MLP),support vector machine(SVM)and gradient boosting regression(GBR),are improved by genetic algorithm(GA)and principal component analysis(PCA)to predict the tunneling posture of the shield machine.A set of the parameters for shield tunneling is extracted from the construction site of a Shanghai *** total,53,785 pairwise data points are collected for about 373 d and the ratio between training set,validation set and test set is 3:1:*** pairwise data point includes 83 types of parameters covering the shield posture,construction parameters,and soil stratum properties at the same *** test results show that the averaged R2 of MLP,SVM and GBR based models are 0.942,0.935 and 0.6,*** the automatic control for the posture of shield tunnel is illustrated with an application example of the proposed *** proposed method is proved to be helpful in controlling the construction quality with optimized construction parameters.

关键词： shield tunneling Machine learning(ML) Construction parameters Optimization

Analysis of a tunnel failure caused by leakage of the shield tail seal system

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Underground Space 2020年第2期5卷 105-114页

作者： Chao Yu Annan Zhou Jun Chen Arul Arulrajah Suksun Horpibulsuk State Key Laboratory of Ocean Engineering Department of Civil EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Discipline of Civil and Infrastructure Engineering School of EngineeringRoyal Melbourne Institute of Technology(RMIT)Victoria 3001Australia Department of Civil and Construction Engineering Swinburne University of TechnologyVictoria 3122Australia School of Civil Engineering and Center of Excellence in Innovation for Sustainable Infrastructure DevelopmentSuranaree University of TechnologyNakhon Ratchasima 30000Thailand

This paper presents an analysis of a tunnel failure accident during shield tunnel construction on Foshan Metro Line 2 in *** failure is caused by the leakage of the multilayer seal system,which consists of several brush seals at the tail of the *** different failure modes for the multilayer seal system are discussed.A simple structural analysis of the brush seals is then conducted,and failure mode 4(failure due to brush seal deformation)is identified as a major reason for the Foshan tunnel accident.A finite element method(FEM)analysis is employed to validate the conclusions drawn from the simple structural analysis of the brush seals.

关键词： Leakage shield tunneling Brush seals Finite element