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Field measurement and analysis of asymmetric shallow buried twin tunnels with ultra small spacing

Wang Yunlong,Tan Zhongsheng,Chen Ying

Strategic Study of CAE 2012, Volume 14, Issue 11,   Pages 24-28

Abstract:

The ultra-small spacing tunnel of Jiaozhou Bay seabed tunnel in Qingdao is took for example; the surrounding rock pressure features and support force are analyzed through the field measurement. Results show that the surrounding rock pressure and support force of the after-excavation tunnel are larger than others of the tunnel. This result is different from the theoretical predictions and experimental results of most of the small spacing symmetry tunnel. To alleviate these problems effectively, support parameters are adjusted opportunely; the radial support capacity of the after-excavation tunnel is enhanced, and reinforcement measures of rock pillar are made at the same time. The monitoring results show that the stability of the after-construction tunnel has been effectively controlled, which provides useful reference for the design and construction of similar tunnels with small spacing.

Keywords： tunnel     ultra-small spacing     asymmetric     shallow-buried     field measurement    

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Key construction technology of shallow-buried large span highway tunnel through rich water soft soil

Zhao Licai

Strategic Study of CAE 2015, Volume 17, Issue 1,   Pages 81-87

Abstract: reinforcement technology+cross-located right next door after disassembly type excavation technology in shallow-buriedprocessing， make the deformation of surrounding rock control， successfully passed the construction of shallow-buried

Keywords： shallow buried； rich water soft soil； tunnel； pipe； reinforcement； cross-located right next door after    

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Construction optimization of shallow-buried tunnel in gravel strata based on controlling settlement of

Yu Jun,Liu Songyu and Gong Xiaonan

Strategic Study of CAE 2013, Volume 15, Issue 10,   Pages 97-102

Abstract: stability of surrounding rock is closely connected with the settlement of the crown during construction of shallow-buriedThe result showed that the crown settlement easily took place during excavation of shallow tunnel and

Keywords： gravel     surrounding rock of tunnel     numerical analysis     construction optimization     crown settlement     site monitoring    

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Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich

Wan Fei,Tan Zhongsheng,Yang Sensen,Ma Dong

Strategic Study of CAE 2014, Volume 16, Issue 8,   Pages 45-53

Abstract:

Shallow buried section under river valley of Guan Jiao tunnel has doneThese research results can provide theoretical basis and underlying date for support scheme for Shallowburied tunnel under river valley, and have high referential value for design and construction decision-making

Keywords： Tunnel project     Shallow buried under river valley     Weak wall rock     Support scheme     Field monitoring    

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Full-mechanized caving mining technology of extremely thick and hard coal-seam with hard roof in shallowburied depth

Zhang Zhongwen,Wu Jinan

Strategic Study of CAE 2011, Volume 13, Issue 11,   Pages 107-112

Abstract: mining with high recovery ratio would be realized by lengthening mining face and adding mining height in shallowburied hard coal-seam with hard roof.

Keywords： shallow buried depth     hard coal-seam with hard roof     top-coal caving difficulty degree     full-mechanized    

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Analysis of mechanical behaviors of big pipe-roof for shallow buried large-span tunnel

Li Jian,Tan Zhongsheng,Yu Yu,Ni Lusu

Strategic Study of CAE 2011, Volume 13, Issue 9,   Pages 92-96

Abstract:

A series of research on mechanical behaviors of big pipe-roof in shallow

Keywords： shallow burying mining     undercrossing construction     loess tunnel     pipe-roof     deformation monitoring    

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Safety assessment for buried drainage box culvert under influence of underground connected aisle blasting

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 2,   Pages 191-204 doi: 10.1007/s11709-022-0906-1

Abstract: The vibration response evolution law of the buried drainage box culvert under blasting vibration wasof the box culvert, and PPV of the surface, it is proposed that the surface control velocity of the buried

Keywords： drainage box culvert     underpass blasting     dynamic response     numerical simulation     safety assessment    

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Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured

Mahdi IZADI, Khosrow BARGI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1105-1119 doi: 10.1007/s11709-019-0539-1

Abstract: The present study investigates the mechanical behavior of a new generation of buried pipelines, dubbedThe present study has assessed 3-D numerical models of two kinds of buried textured pipelines, with 6

Keywords： buried pipeline     textured pipeline     local buckling    

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Mechanical responses of multi-layered ground due to shallow tunneling with arbitrary ground surface load

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 745-762 doi: 10.1007/s11709-023-0935-4

Abstract: analytical model based on complex variable theory is proposed to investigate ground responses due to shallowThe present model is superior to the classical model for analyzing ground responses of shallow tunnelingthus, it can be used with assurance to estimate the ground movement and surface building safety of shallow

Keywords： analytical model     mechanical response     multi-layered ground     shallow tunneling     ground surface load    

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Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 147-168 doi: 10.1007/s11709-019-0587-6

Abstract: polyethylene fittings in joining polyethylene gas pipes which are electrofused onto the pipe ends and buriedBuried polyethylene pipelines in the natural gas industry, can be imposed by sever loadings includingAlthough the buried pipe is imposed to the maximum values of stresses, the PE100 socket is more sensitivefour studied patch arrangements show significant reinforcing effects on the defected section of the buriedMeanwhile, the defected buried medium density polyethylene gas pipe and its saddle fused patch can resist

Keywords： Ansys software     polyethylene     buried pipelines     polyethylene joints     polyethylene patches     peak von Mises    

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Comparison of shallow tunneling method with pile and rib method for construction of subway station in

Sina AMIRI; Ali Naghi DEHGHAN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 6,   Pages 704-717 doi: 10.1007/s11709-021-0746-4

Abstract: In the present study, a comparison between the new shallow tunneling method (STM) and the traditional

Keywords： shallow tunneling method     pile and rib method     ground surface settlement     subway station construction    

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Centrifuge experiments for shallow tunnels at active reverse fault intersection

Mehdi SABAGH, Abbas GHALANDARZADEH

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 731-745 doi: 10.1007/s11709-020-0614-7

Abstract: Tunnels extend in large stretches with continuous lengths of up to hundreds of kilometers which are vulnerable to faulting in earthquake-prone areas. Assessing the interaction of soil and tunnel at an intersection with an active fault during an earthquake can be a beneficial guideline for tunnel design engineers. Here, a series of 4 centrifuge tests are planned and tested on continuous tunnels. Dip-slip surface faulting in reverse mechanism of 60-degree is modeled by a fault simulator box in a quasi-static manner. Failure mechanism, progression and locations of damages to the tunnels are assessed through a gradual increase in Permanent Ground Displacement (PGD). The ground surface deformations and strains, fault surface trace, fault scarp and the sinkhole caused by fault movement are observed here. These ground surface deformations are major threats to stability, safety and serviceability of the structures. According to the observations, the modeled tunnels are vulnerable to reverse fault rupture and but the functionality loss is not abrupt, and the tunnel will be able to tolerate some fault displacements. By monitoring the progress of damage states by increasing PGD, the fragility curves corresponding to each damage state were plotted and interpreted in related figures.

Keywords： reverse fault rupture     continuous tunnel     geotechnical centrifuge     ground surface deformations     fragility curves    

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Strategic Thinking on Shallow-water Oil and Gas Exploration in Offshore China

Ke-qiang Wu,Jian-yong Xu,Bo Kang

Frontiers of Engineering Management 2016, Volume 3, Issue 4,   Pages 349-355 doi: 10.15302/J-FEM-2016056

Abstract: offshore China has made great achievements, and as the important areas of offshore exploration, the shallowTherefore, for effective exploration of shallow-water oil and gas in offshore China, it is necessaryresearch projects in the fields of China’s offshore stratigraphic-lithologic reserves, Paleogene reserves, buried-hill

Keywords： offshore China     shallow-water oil and gas exploration     strategic thinking     challenge     countermeasure    

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Control concept and countermeasures for shallow lakes' eutrophication in China

JIN Xiangcan, LU Shaoyong, HU Xiaozhen, JIANG Xia, WU Fengchang

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 3,   Pages 257-266 doi: 10.1007/s11783-008-0063-3

Abstract: Research on lake eutrophication in China began in the early 1970s, and many lakes in China are now known to be in meso-eutrophic status. Lake eutrophication has been showing a rapidly increasing trend since 2000. Investigations show that the main reasons for lake eutrophication include a fragile lake background environment, excessive nutrient loading into lakes, excessive human activities, ecological degeneration, weak environmental protection awareness, and lax lake management. Major mechanisms resulting from lake eutrophication include nutrient recycling imbalance, major changes in water chemistry (pH, oxygen, and carbon), lake ecosystem imbalance, and algal prevalence in lakes. Some concepts for controlling eutrophication should be persistently proposed, including lake catchment control, combination of pollutant source control with ecological restoration, protection of three important aspects (terrestrial ecology, lake coast zone, and submerged plant), and combination of lake management with regulation. Measures to control lake eutrophication should include pollution source control (i.e., optimize industrial structural adjustments in the lake catchment, reduce nitrogen and phosphorus emission amounts, and control endogenous pollution) and lake ecological restoration (i.e. establish a zone-lake buffer region and lakeside zone, protect regional vegetation, utilize hydrophytes in renovation technology); countermeasures for lake management should include implementing water quality management, identifying environmental and lake water goals, legislating and formulating laws and regulations to protect lakes, strengthening publicity and the education of people, increasing public awareness through participation in systems and mechanic innovations, establishing lake region management institutions, and ensuring implementation of governance and management measures.

Keywords： excessive     participation     prevalence     lakeside     Research    

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Research on Demarcating Method for Deep Tunnel and Shallow Tunnel in Soil

Zhao Zhanchang,Xie Yongli

Strategic Study of CAE 2005, Volume 7, Issue 10,   Pages 84-86

Abstract:

Directed against the demarcating problems of deep tunnel and shallow tunnel in exiting methods, the

Keywords： soil tunnel     deep tunnel and shallow tunnel     demarcating method    

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Title Author Date Type Operation

Field measurement and analysis of asymmetric shallow buried twin tunnels with ultra small spacing

Wang Yunlong,Tan Zhongsheng,Chen Ying

Journal Article

Key construction technology of shallow-buried large span highway tunnel through rich water soft soil

Zhao Licai

Journal Article

Construction optimization of shallow-buried tunnel in gravel strata based on controlling settlement of

Yu Jun,Liu Songyu and Gong Xiaonan

Journal Article

Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich

Wan Fei,Tan Zhongsheng,Yang Sensen,Ma Dong

Journal Article

Full-mechanized caving mining technology of extremely thick and hard coal-seam with hard roof in shallowburied depth

Zhang Zhongwen,Wu Jinan

Journal Article

Analysis of mechanical behaviors of big pipe-roof for shallow buried large-span tunnel

Li Jian,Tan Zhongsheng,Yu Yu,Ni Lusu

Journal Article

Safety assessment for buried drainage box culvert under influence of underground connected aisle blasting

Journal Article

Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured

Mahdi IZADI, Khosrow BARGI

Journal Article

Mechanical responses of multi-layered ground due to shallow tunneling with arbitrary ground surface load

Journal Article

Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Journal Article

Comparison of shallow tunneling method with pile and rib method for construction of subway station in

Sina AMIRI; Ali Naghi DEHGHAN

Journal Article

Centrifuge experiments for shallow tunnels at active reverse fault intersection

Mehdi SABAGH, Abbas GHALANDARZADEH

Journal Article

Strategic Thinking on Shallow-water Oil and Gas Exploration in Offshore China

Ke-qiang Wu,Jian-yong Xu,Bo Kang

Journal Article

Control concept and countermeasures for shallow lakes' eutrophication in China

JIN Xiangcan, LU Shaoyong, HU Xiaozhen, JIANG Xia, WU Fengchang

Journal Article

Research on Demarcating Method for Deep Tunnel and Shallow Tunnel in Soil

Zhao Zhanchang,Xie Yongli

Journal Article