Risk analysis for tunnelling ground movement assessments

Devriendt, M

doi:10.1680/geng.2009.163.3.109

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…When the new and old structures are relatively close, the excavation of the tunnel will cause the rock and soil around the existing structure. Disturbances will cause stress redistribution of surrounding rocks, which may easily cause safety accidents such as the decline or even destruction of the bearing capacity of structures, ground subsidence, and pipe network fractures [11][12][13]. (2) Due to the complex relationship between rail transit transfers and rail transit sections, the mutual influence is large, which makes the design and construction difficult [14,15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Structural Form and Excavation Model of Urban Metro Cross Transfer Station with Super Large Cross Section and Shallow Excavation

Lin

Chen

Yang

et al. 2020

Advances in Civil Engineering

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The construction of urban underground cross-interchange transfer subway stations often encounters the difficulties of shallow-buried, different surrounding rock, large spans and heights, congested road traffic, and surrounding buildings sensitive to the construction sequence. Therefore, there is a need for an underground project that controls the stability of underground space and ground subsidence. Based on the construction difficulties of a certain station (the maximum excavation area over 760 m2), this paper conducts a comprehensive selection design of the structure, construction mechanics response, and control technology of this type of interchange station structure and construction excavation. First of all, based on the design experience of large-scale underground transfer transportation engineering and taking full consideration of the stratum conditions, an “arch-wall” cross transfer structure method is proposed. The refined numerical analysis shows that the structure can fully utilize the stratum conditions to reduce the ground surface settlement. Then, in view of the stability of surrounding rock during the construction of a large section, based on the traditional large section excavation method, a construction method of “cross rock beam + heading method” was proposed. In order to verify the effect of the construction method, the three-dimensional detailed numerical model was used to simulate the construction conditions, and the mechanical response characteristics and displacement changes of surrounding rock under each excavation step are explored. Simultaneous interpreting with the traditional large section excavation method, the results show that the new method has advantages in controlling the stability of the surrounding rock. Meanwhile, in order to ensure the safe construction of the project, the self-developed multifunctional engineering test system for traffic tunnels is used to carry out a large-scale physical model experiment to simulate the entire process of the “arch-wall” cross transfer structure construction response characteristics. By analyzing the data of measuring points, the results show that the structure form and the excavation method cause the ground surface settlement, stress, and structural forces meet the requirements for safe construction. Finally, the station can be safely constructed under the new structure form and construction method. Therefore, the structure form and method proposed in this paper can be adapted to the large-scale underground structure under construction in complex environments.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Structural Form and Excavation Model of Urban Metro Cross Transfer Station with Super Large Cross Section and Shallow Excavation

Lin

Chen

Yang

et al. 2020

Advances in Civil Engineering

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“…These movements propagate throughout the soil mass and may have a detrimental effect on buildings and services. Devriendt (2010) detailed the design requirements during potential damage assessment of a proposed tunnelling project. The author stated that stage 1 is the identification of the significant settlements.…”

Section: Introductionmentioning

confidence: 99%

Twin-tunnelling-induced ground movements in clay

Divall

Goodey

2015

Proceedings of the Institution of Civil Engineers - Geotechnica

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This is the published version of the paper.This version of the publication may differ from the final published version. Modern tunnelling methods aim to reduce ground movements arising from the construction process. In clay strata the usual method of construction is by tunnel boring machine, which allows close control of the tunnelling process; however, any movements have the potential to cause damage to existing structures at, and below, the ground surface. The construction of underground rail systems often comprises two tunnels running in opposite directions. Permanent repository linkCommon practice for assessing construction-generated movements around these tunnels is to make predictions based upon individual tunnel construction and utilise superposition to generate a total deformation profile. This approach does not take into account the strain-or stress-dependent effects between tunnel constructions. A delay may result in unanticipated ground movements generated by the construction of the second tunnel. The effect of this delay on the ground movements arising between the first and the second tunnel construction process was investigated in a series of plane strain centrifuge tests. The ground movements at and below the surface were monitored and were assessed against superposition-based predictions for surface settlement with the outcomes highlighting some inconsistencies. A procedure for predicting both surface and subsurface vertical settlement profiles in the plane transverse to the advancing tunnels in clay is suggested.

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