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ground settlement and tunnel response due to twin-curved shield tunnelling in soft ground with small clear distance

Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3122-3135页

作者： Yao Hu Haoran Tang Yinggang Xu Huayang Lei Peng Zeng Kai Yao Yabo Dong State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China Research Center of Tunneling and Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing100044China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu610059China School of Civil Engineering Tianjin UniversityTianjin300350China School of Qilu Transportation Shandong UniversityJinan250002China Power China Sinohydro Bureau 7 Co. Ltd.Chengdu610213China

Twin curved tunnels are often encountered in shield tunnelling,where significant complexities in densely exploited underground space are *** this study,the ground settlement and tunnel deformation due to twin-curved shield tunnelling in soft ground were investigated using numerical simulation and field *** curvature radii of twin curved tunnels and subsequent effects of tunnel construction were considered to reveal the tunnelling effect on ground surface settlement and tunnel *** results show that the settlement trough yields one offset towards inside of curved shield *** location of settlement trough and maximum settlement were affected by curvature radius but except for the shape and width of settlement *** parallel twin-curved shield tunnelling could increase the offset of existing settlement trough and maximum ***,an empirical prediction of surface settlement trough due to twin-curved shield tunnelling with same tunnel diameters in soft clay was proposed,which was applicable to curvature radius less than 800 ***,a minimum radius of 600 m of curvature tunnel was proposed in terms of allowable convergence deformation of *** result could provide guidance on safety evaluation for twin curved shield tunnelling construction.

关键词： Shield tunnelling Curvature radius ground settlement Tunnel deformation Numerical simulation

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Analytical solutions of ground settlement induced by yaw in a space curved shield tunnel

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Underground Space 2023年第6期13卷 86-103页

作者： Jiannan Xie Pengfei Li Mingju Zhang Fei Jia Shaohua Li Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of TechnologyBeijing 100124China China Railway No.3 Engineering Group No.4 Engineering Co. Ltd.Beijing 102300China China Railway 15th Bureau Group Co. Ltd.Shanghai 200070China

This paper aims to provide the analytical solutions of the ground settlement for a space curved shield tunnel in the case of yaw *** inducements include ground loss and construction loads,and two corresponding analytical models have been proposed in this ***-dimensional image theory has been adopted to calculate the ground settlement due to ground *** parameters are introduced into the calculation model to deduce the relevant laws of the ground *** on modified Mindlin solutions,analytical models are established to calculate the ground settlement induced by construction loads,such as the frontal additional thrust,axial friction of shield shell,and the grouting *** method of calculating the position of the shield machine in the ground is refined,and the influence area of construction loads from the shield machine is ***,the obtained solutions are validated by a numerical model and field ***,a comparison reveals that the proposed model is the composition of three classical analytical models,thus it excels them in solving the problem ***,parametric analyses of yaw are conducted to examine yaw angle and pitch angle on ground *** proposed model can effectively predict ground settlement caused by the spatial linear shield tunneling process.

关键词： Shield tunnel Space line Yaw excavation ground loss Construction load ground settlement

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ground settlement during tunneling in groundwater drawdown environment-Influencing factors

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Underground Space 2016年第1期1卷 20-29页

作者： Chungsik Yoo School of Civil Architectural Engineering and Landscape ArchitectureSungkyunkwan University2066 Seoboo RoJan-An GuSuwonKyong-Gi Do 16419Republic of Korea

In this paper,the results of a parametric study on groundwater drawdown-induced surface settlement during tunneling in waterbearing ground are presented.A calibrated stress–pore pressure coupled finite element model was adopted for the parametric *** results were analyzed to establish the relationships between key design issues,such as the ground surface settlement and groundwater drawdown,and influencing *** artificial neural network(ANN)-based sensitivity analysis was performed to obtain insight into the relative importance of the influencing *** results indicated that the primary influencing factors on the settlement development are the thickness and stiffness of the soil layer within the drawdown zone and the lining permeability,while the initial void ratio and the permeability of the soil layer were considered secondary influencing *** implications and findings of the study are discussed.

关键词： Conventional tunneling ground settlement groundwater Finite element method Stress-pore pressure coupled analysis

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Analytical solutions to ground settlement induced by ground loss and construction loadings during curved shield tunneling

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2021年第4期22卷 296-313页

作者： Shao-hua LI Ming-ju ZHANG Peng-fei LI Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education Beijing University of TechnologyBeijing 100124China China Railway 15th Bureau Group Co. Ltd.Shanghai 200070China

This paper focuses on the ground settlement induced by the construction of a curved shield *** loss and construction loadings are the two factors causing ground settlement,and two corresponding analytical models were ***,the ground settlement due to ground loss was analyzed based on 3D image ***"integrative gap at shield tail"(IGST)and overcutting gap of a curved tunnel were ***,the ground settlement due to construction loadings was analyzed by modifying Mindlin's *** additional thrust,frictional force,and grouting pressure were ***,a case study and a parameter analysis were ***,the obtained solutions were compared with a classical analytical solution,numerical simulations,and monitored *** proposed model could effectively predict the ground settlement in-duced during curved shield tunneling.

关键词： Curved tunnel Image theory Mindlin's solution ground loss ground settlement

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Centrifuge modeling of tunneling-induced ground surface settlement in sand

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Underground Space 2019年第4期4卷 302-309页

作者： Hu Lu Jiangwei Shi Yu Wang Rong Wang Shenzhen Polytechnic No.7098 Liu Xian AvenueNanshan DistrictShenzhenChina Key Laboratory of Geomechanics and Embankment Engineering of the Ministry of Education Geotechnical Research InstituteHohai University1 Xikang RoadNanjing 210098China Department of Architecture and Civil Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina China Harbour Engineering Company Ltd. No.9Chunxiu RoadDongzhi GateDongcheng DistrictBeijingChina

Stress changes in the soil induced by tunnel excavation may cause excessive ground ***,high-quality experimental data on ground settlement due to tunnel excavation are *** this study,centrifuge tests are conducted to investigate the threedimensional ground surface settlement,considering different intersection angles and cover-to-tunnel diameter *** results indicate that the major influence zone along the longitudinal direction on the ground surface settlement is±1.25D,where D is the tunnel *** the monitoring section is perpendicular to the tunneling direction,the transverse ground settlement due to the tunnel excavation is symmetrical with respect to the tunnel *** contrast,an asymmetric ground settlement profile is observed when the monitoring section intersects the tunneling direction at an angle of 60.Applying a Gaussian curve to fit the ground surface settlement curve,the width parameter,K(i.e.,the distance between the tunnel centerline and the inflection point of the settlement trough to the tunnel burial depth),varies from 0.33 to *** ground surface settlement induced by twin tunnel excavation can be captured reasonably by superimposing two identical Gaussian *** the cover to tunnel diameter ratios(C/D)are 1.5 and 2.7,the maximum ground surface settlements are 0.67%of D and 0.35%of D,*** is clear that the maximum ground surface settlement decreases with an increase in the C/D ratio.

关键词： ground settlement Centrifuge modeling Intersection angle Cover-to-tunnel diameter Three-dimensional

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Novel pipe-roof method for a super shallow buried and large-span metro underground station

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Underground Space 2022年第1期7卷 134-150页

作者： Bo Lu Jiachao Dong Wen Zhao Xi Du Cheng Cheng Qian Bai Zhiguo Wang Mingcheng Zhao Jianyong Han School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China The School of Civil and Environmental Engineering University of New South WalesSydney 2052Australia The First Company of China Eighth Engineering Division Ltd Jinan 250014China School of Civil Engineering Shandong Jianzhu UniversityJinan 250101China

To address the inadequacies of traditional pipe-roof methods,the steel support cutting pipe method(SSCP)—a novel pipe-roof method that improves construction security and underground space usage—is *** further explore the applications of SSCP,its design scheme ought to be *** failure mode and mechanical behaviors of the SSCP were investigated through laboratory ***,a series of finite element models(FEMs)was established to study the deformation ***,the parameters of the steel support of the proposed structure were optimized using fuzzy *** results indicated the ultimate bearing capacity to be 366.8 kN,and the specimen began to yield when the external load reached 70%of the ultimate *** lon-gitudinal spacing of the steel supports,transverse steel support size,and vertical steel support size had significant effect on the vertical deformation of the steel support and the ground ***,the optimal combination of steel supports for the SSCP structure was obtained.

关键词： Steel support cutting pipe method ground settlement Deformation characteristics Fuzzy mathematical theory Parameter optimization

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Feasibility study on sinkhole monitoring with fiber optic strain sensing nerves

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 3059-3070页

作者： Yuxin Gao Honghu Zhu Liang Qiao Xifeng Liu Chao Wei Wei Zhang School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China Institute of Earth Exploration and Sensing Nanjing UniversityNanjing210023China

Anthropogenic activity-induced sinkholes pose a serious threat to building safety and human life ***-time detection and early warning of sinkhole formation are a key and urgent problem in urban *** paper presents an experimental study to evaluate the feasibility of fiber optic strain sensing nerves in sinkhole *** the artificial neural network(ANN)and particle image velocimetry(PIV)techniques,a series of model tests have been performed to explore the relationship between strain measurements and sinkhole development and to establish a conversion model from strain data to ground *** is demonstrated that the failure mechanism of the soil above the sinkhole developed from a triangle failure plane to a vertical failure plane with increasing collapse ***,the soil-embedded fiber optic strain sensing nerves allowed deformation monitoring of the ground soil in real ***,the characteristics of the measured strain profiles indicate the locations of sinkholes and the associated shear *** on the strain data,the ANN model predicts the ground settlement ***,micro-anchored fiber optic cables have been proven to increase the soil-to-fiber strain transfer efficiency for large deformation monitoring of ground collapse.

关键词： Sinkhole Geotechnical monitoring Distributed fiber optic sensing(DFOS) Artificial neural network(ANN) ground settlement Soil arching Micro-anchor

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Observed response of maglev structure undercrossed by three shield tunnels in soft soil

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Underground Space 2022年第4期7卷 636-661页

作者： Dong-Mei Zhang Xiao-Chuang Xie Zhong-Kai Huang Mao-Zhu Peng Hong-Xin Zhu Key Laboratory of Geotechnical and Underground Engineering Ministry of EducationTongji UniversityShanghai 200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Centre for Offshore Foundation Systems University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009Australia Shanghai Municipal Engineering Design Institute(Group)Co. Ltd.China

This paper investigates the response of a maglev structure to three under-crossing tunnels of the Shanghai Metro Line *** minimal distance between the tunnels and pile groups of the maglev structure is only 1.5 m,thus the deformations of the maglev structure are strictly controlled for the serviceability of the operating maglev *** displacements of maglev piers and ground settlements during different tunnelling stages are monitored with an automatic measuring *** on the observed data,the ground settlement trough and displacements of maglev piers caused by the three shield tunnelling procedures are analyzed and *** maximal ground settlement after the completion of the three tunnelling procedures is -43 *** operate the existing maglev safely,practical construction control methods are applied,including synchronous grouting,adjustment of the shield status,shield-advancing speed control,and stabilisation of the soil chamber *** these countermeasures,the tunnel-induced deformations of maglev piers are well below the predefined *** piers heave under the strict deformation criterion of 2.0 *** crossing project is finally completed without interruptions of the maglev operations by monitoring the *** presented project is a valuable example for the evaluation of shield tunnelling effects on the adjacent maglev structures and establishes criteria for similar projects in the future.

关键词： Maglev Multi-crossing Shield tunnelling ground settlement Pier displacement

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Drainage-induced ground response in a twin-tunnel system through analytical prediction over the seepage field

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Underground Space 2022年第3期7卷 408-418页

作者： Cheng-wei Zhu Wei Wu Hong-wei Ying Xiao-nan Gong Pan-pan Guo Research Center of Coastal and Urban Geotechnical Engineering HangzhouChina Institut fur Geotechnik Universitat fur BodenkulturFeistmantelstrasse 4A-1180 ViennaAustria Institute of Geotechinical Engineering Hohai UniversityNanjingChina

Leakage-induced hydraulic and ground responses in a twin-tunnel system are analyzed via the proposed analytical solution on the seepage *** seepage continuity conditions are rigorously satisfied at the interface between the ground and the tunnel lining,in terms of both water pressure and seepage *** analytical solution is verified by comparing the results of numerical simulations.A detailed parametric analysis is carried out to explore the effect of tunnels’spatial layouts and degraded waterproof facilities on leakageinduced hydraulic and ground response,including head decline,water inflow and ground surface *** results show that the often used single tunnel model tends to overestimate the pore pressure on the lining along with water inflow into the tunnel,and underestimate the leakage-induced ground settlement.

关键词： Twin tunnel Leakage Head decline Water inflow ground settlement

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Environmentally sustainable groundwater control during dewatering with barriers:A case study in Shanghai

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Underground Space 2021年第1期6卷 12-23页

作者： Zhi-Fei Xie Shui-Long Shen Arul Arulrajah Suksun Horpibulsuk Department of Civil Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Civil and Environmental Engineering Shantou UniversityShantouChina Key Laboratory of Intelligent Manufacturing Technology(Shantou University) Ministry of EducationShantouGuangdong 515063China 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 a case study on groundwater control and environmental protection during a deep excavation of the foundation pit for the Liyang Road Station of Metro Line 10 in Shanghai.A three-dimensional finite element simulation model was constructed to quantify the effects of a dewatering process on the environment around the excavation *** understand the decrease in the groundwater level around the foundation pit,the ground settlement and groundwater level were *** the excavation,environmental protection methods were used in the design of the optimal watering system to check its detrimental environmental *** effects of the diaphragm wall and horizontal barrier system were analyzed by varying their insertion depths and the resulting changes in the ground settlement and groundwater level were *** was found that increasing the insertion depth of the diaphragm wall reduced settlement near the excavation site but increased the construction *** diaphragm wall used in combination with a horizontal barrier was found to be effective in arresting the decrease in groundwater level and reducing settlement around the excavation site.

关键词： Dewatering Horizontal barrier Diaphragm wall ground settlement Drawdown Confined water

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