Tunnelling-induced ground settlements in a groundwater drawdown environment – A case history

Yoo, Chung-Sik; Lee, YongJoo; Kim, Sang‐Hwan; Kim, Hong-Taek

doi:10.1016/j.tust.2012.01.002

Cited by 53 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The solutions based on that the surrounding rock permeability decreased under non-supporting excavation condition, and these results were verified through on-site measurements and numerical simulation [5]. Yoo et al revealed the direct relationship between the water level and the surface subsidence by a three-dimensional finite element model for coupling analysis of the stress and the pore pressure [6].…”

Section: Introductionmentioning

confidence: 86%

Evolution Characteristic Analysis of Pressure - arch of a Double - arch Tunnel in Water - rich Strata

Li¹,

Wang²,

Zou³

et al. 2016

JESTR

View full text Add to dashboard Cite

It is of importance to analyze the morphological characterization, the evolution process and the skewed effect of pressure-arch of a double-arch tunnel in the water-rich strata. Taking a buried depth 80 m double-arch tunnel as an example, a computational model of the double-arch tunnel was built by using FLAC3D technique. Then considering some aspects including groundwater conditions, tunnel depth, construction sequences and permeability coefficients, the coupling effect of stress field and seepage field in the pressure-arch of the double-arch tunnel was analyzed. The results show that the thickness of the pressure-arch induced by step-by-step excavation and display a step-descent skewed distribution from the left to the right of the double-arch tunnel. The permeability coefficient has a significant influence on the shape and the skewed effect of the pressure arch. The excavation of the bench method has a better arching condition than that of the expanding method. The abtained results provide a basic reference for the rock reinforcement design and safety construction of double-arch tunnels in the water-rich strata.

show abstract

Section: Introductionmentioning

confidence: 86%

Evolution Characteristic Analysis of Pressure - arch of a Double - arch Tunnel in Water - rich Strata

Li¹,

Wang²,

Zou³

et al. 2016

JESTR

View full text Add to dashboard Cite

show abstract

“…Researches regarding the effects of water drawdown on the stability of slopes and dams have been done by Viratjandr and Michalowski [4], Yan et al [5], Wang et al [6], Gao et al [7], Song et al [8] Brinkgreve et al [9] and Zieba et al [10]. The limited number of studies on this subject include Atkinson and Mair [11], Bowers et al [12], Addenbrooke [13], Shin et al [2], Anagnostou [14,1], Yoo et al [15], Moon and Fernandez [16], Wanga and Wang [17], Yoo et al [18], Shen et al [19] Xu et al [20], Alonso and Pinyol [21] and Yoo [3,22]. Yoo et al [18] reported an important case study about ground surface settlements during tunnelling.…”

Section: Figure 1 Ground Settlement Affected By Rapid Drawdown Durinmentioning

confidence: 99%

“…The limited number of studies on this subject include Atkinson and Mair [11], Bowers et al [12], Addenbrooke [13], Shin et al [2], Anagnostou [14,1], Yoo et al [15], Moon and Fernandez [16], Wanga and Wang [17], Yoo et al [18], Shen et al [19] Xu et al [20], Alonso and Pinyol [21] and Yoo [3,22]. Yoo et al [18] reported an important case study about ground surface settlements during tunnelling. Yoo [22] focused on the interaction between tunneling and groundwater during tunneling in water-bearing ground.…”

Section: Figure 1 Ground Settlement Affected By Rapid Drawdown Durinmentioning

confidence: 99%

Study on the Rapid Drawdown and Its Effect on Portal Subsidence of Heybat Sultan Twin Tunnels in Kurdistan-Iraq

2017

View full text Add to dashboard Cite

The excavation of tunnels below the water table causes variations in the hydraulic level, pore pressure and effective stresses. In this regard, rapid drawdown is considered as a destructive phenomenon as to the change in the flow regime which has mostly been studied for the reservoirs of embankment dams. The rapid drawdown occurred at the upstream shell of the dam gives rise to increase in the pore pressure at the upstream shell. This is as a result of the incompliance between the water loss inside the shell and the reservoir water level. Hence, it would be more likely to have instability and sliding at the upstream slope on account of decrease in the effective stress. Lack of sufficient studies performed on this matter in tunnelling projects on the one hand and the knowledge on the most important parameter for decreasing the destructive effects of this phenomenon on the other hand necessitates performing further studies on this matter. To this end, the reasons for the occurrence as well as the affecting parameters were studied by modelling the large subsidence of the inlet portal of Heybat Sultan twin tunnels located in Kurdistan-Iraq making use of the variations of the groundwater boundary conditions under Phase2 code. The modelling results depict the importance of the drawdown rate and the permeability coefficient of the surrounding rock mass. In the interim, the rapid loss in the hydraulic gradient caused by the drainage of a considerable volume of precipitations into the tunnels led to the rapid decrease in the pore pressure and increase in the effective stresses up to total stress. This has resulted in the consolidation settlement in the tunnel portal.

show abstract

“…Shen et al [22] proposed that groundwater infiltration was responsible for the long-term settlement of tunnels. Yoo et al [23] found that excessive surface settlement and large settlement affecting the zone were caused by groundwater drawdown. Shen and Xu [24] established a numerical model analyzing the relationships among land subsidence, groundwater withdrawal volume, and groundwater level to predict land subsidence due to groundwater withdrawal.…”

Section: Introductionmentioning

confidence: 99%

Modification of Peck Formula to Predict Ground Surface Settlement of Twin Tunnels in Low Permeability Soil

Tang

Liang

Liu

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Accurate prediction of surface settlement induced by tunnel excavation is significant for preventing damage to existing structures under complex geological conditions. The Peck formula is currently considered as an efficient solution for surface settlement prediction. This paper proposes a modified Peck formula considering geological conditions to improve the accuracy of surface settlement prediction of twin tunnels. The asynchronization of the sinking rate and stability of the vault settlement and surface settlement within the river-affected area may attribute to the groundwater drawdown caused by cofferdam construction on the river. A modified Peck formula is put forward with soil permeability and width-controlling parameters involved. There is a small settlement at the center of the twin tunnels, making the settlement trough upward buckling, which is like a “W” shape. This situation can be accurately predicted by the modified formula with a significantly increased adjusted R-square. The modified formula can accurately predict the surface settlement of tunnels excavated in low permeability soil layers with a permeability coefficient between 10−4 cm/s and 10−7 cm/s, especially in the groundwater drawdown environment. The reliability of the modified Peck formula is verified by other cases in Nanjing and Singapore.

show abstract

Tunnelling-induced ground settlements in a groundwater drawdown environment – A case history

Cited by 53 publications

References 10 publications

Evolution Characteristic Analysis of Pressure - arch of a Double - arch Tunnel in Water - rich Strata

Evolution Characteristic Analysis of Pressure - arch of a Double - arch Tunnel in Water - rich Strata

Study on the Rapid Drawdown and Its Effect on Portal Subsidence of Heybat Sultan Twin Tunnels in Kurdistan-Iraq

Modification of Peck Formula to Predict Ground Surface Settlement of Twin Tunnels in Low Permeability Soil

Contact Info

Product

Resources

About