Excavation-induced deformation and damage evolution of deep tunnels based on a realistic stress path

Sun, Qihao; Ma, Feifei; Guo, Jie; Zhao, Haijun; Li, Guang; Liu, Shuaiqi; Duan, Xueliang

doi:10.1016/j.compgeo.2020.103843

Cited by 35 publications

(5 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, Lin et al [10][11][12][13] studied the vibration characteristics and regularities of the wall and middle rock of the existing operating tunnel through insite blasting tests. In addition, Sun et al [14] studied characteristics of the deformation evolution of surrounding rock and the stress of supporting structure in the construction process of the new tunnel through the insite monitoring measurements. Moreover, Yang et al [15] compared the deformation and mechanical properties of surrounding rock during the construction of new and expanded tunnels through numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Dynamic Response of In Situ Blasting Expansion of Large Cross‐Section Tunnel with Small Net Distance

Zhang

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Based on the Damaoshan Highway Tunnel Reconstruction and Expansion Project, the dynamic response of adjacent tunnels during the blasting excavation of existing tunnels is analyzed by using the LS_DYNA finite element software, and the blasting vibration response and lining stress change in the blasting process are studied. Taking the particle peak vibration speed as the criterion, the traffic safety of the adjacent operating tunnels is determined. Moreover, the stress changes of the adjacent tunnel lining caused by blasting excavation are studied through the maximum principal stress. The results show that the particle peak vibration speed on the front explosion side is significantly greater than that on the back explosion side, and the maximum particle peak vibration speed on the road surface is 13 cm/s, which is greater than the allowable safety standard. Besides, the maximum principal stress on the front explosion side is about 1.5 times of that on the back explosion side, showing a “quasi-bias” phenomenon. Therefore, it is recommended to control the operation of the tunnel during the blasting process and especially focus on monitoring the vibration responses and stress changes of the lining of the operating tunnel during the construction period.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Dynamic Response of In Situ Blasting Expansion of Large Cross‐Section Tunnel with Small Net Distance

Zhang

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…4) Proximity of existing structures: construction projects involve deep excavation works that can cause serious damage to existing buildings surrounding the project due to ground deformation, settlement, or subsidence. Additional forces are generated in the supports and their connections, as well as additional deformation and displacement [27], [28], [29]. In order to ensure the stability of existing buildings [29], [30], one must understand the identification of soil and seepage water conditions, foundation types of neighboring buildings, and define the requirements for adequate functional and technical solutions; 5) Site security: Construction site accidents can be caused by managers involved in project planning and the management of workers and can also occur due to unsafe works, work pressure, and the inadequate cost of the project to carry out quality works in the planned time [2], [31], [32], [33].…”

Section: ) Geology Geotechnics and Hydrogeology Of The Sitementioning

confidence: 99%

Study of the Factors Affecting the Quality and Safety of Deep Excavations in Urban Areas of Casablanca-Settat Province-Morocco

Ghizlane¹,

Ouadif²,

Bahi³

2022

Int. J. Adv. Sci. Eng. Inf. Technol.

View full text Add to dashboard Cite

Understanding the project environment is essential in managing the works and controlling the risks associated with deep excavations in urban areas. The study was carried out on 33 risks related to the project site (SR) and the company (CR). The projects concerned are located in the Casablanca region. A structured survey questionnaire was sent to 100 project managers, researchers, and construction management experts to attract relevant data, which resulted in a relatively high response rate of 54%. This paper applies the principal component analysis (PCA) method to reduce the original data variables and identify risk factors associated with deep excavations. Spearman rank correlation tests show a good consensus among respondents to corroborate the results further. The PCA results in four principal factors (SR) accounting for 68% of the variance explained. Site geology, geotechnics, and hydrogeology account for 32% of the environmental and social impacts of excavation (17%), natural hazards (10%), and proximity to existing structures (8%). Moreover, four main factors (CR) explain about 72% of all the factors analyzed; non-security of the works (32%), non-quality of project staff (18%), project cost overrun (14%), and non-quality of excavation works (9%). These results are useful for critical thinking in planning excavation projects in urban areas. This study provides the urban development community with valuable information to reassess risk factors and realign project management strategies to ensure the quality and safety of deep excavations.

show abstract

“…In addition, the brittle failure process was observed in in-situ tests in the deep tunneling (e.g., the Mine-by Experiment conducted by the AECL’s Underground Research Laboratory in Canada (Martini et al 1997 ), the KAERI underground research tunnel in Korea (Kwon et al 2009 ) and the Äspö Pillar Stability Experiment by the Äspö Hard Rock Laboratory in Sweden (Andersson et al 2009 ). Laboratory experiments (Haimson 2007 ; Labiouse et al 2014 ; Labiouse and Vietor 2014 ; Yang et al 2018 ; Li et al 2019 ) and theoretical and numerical simulations (Perras et al 2010 ; Perras and Diederichs 2016a , b ; Vazaios et al 2019a , b ; Sun et al 2021 ) were also conducted to explore the failure mechanism of the surrounding rocks. The lateral pressure coefficient can affect the shape and the dimension of the EDZ (Bai-quan et al 2015 ).…”

Section: Introductionmentioning

confidence: 99%

“…However, the in-situ tests were commonly limited due to the high costs and the technique issues (Hartkorn 1997 ; Feng et al 2018 ). Also, the existing laboratory experimental methods cannot reproduce the tunnels’ real stress loading/unloading path (Sun et al 2021 ), especially for those excavated by D&B. The overloading tests were often conducted on the specimens with a prefabricated circular hole (Pan et al 2020 ; Yi et al 2020 ; Gong et al 2022a , b ; Zhang et al 2022 ) or by excavating a hole in an intact rock mass under pre-stress (Yang et al 2018 ; Li et al 2019 ; Abierdi and Xiang 2020 ; Zhu et al 2020 ; Xiang et al 2021 ; Askaripour et al 2022 ; Gong et al 2022a , b ; Hao et al 2022 ; Zhu et al 2022a , b ).…”

Section: Introductionmentioning

confidence: 99%

Dynamic failure characteristics of surrounding rocks under different lateral pressure coefficients in deep tunnel transient excavation

Yao

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

View full text Add to dashboard Cite

A novel transient unloading testing system was adopted to simulate the transient excavation of tunnels under different lateral pressure coefficients (k0). The results show that the transient excavation of a tunnel induces significant stress redistributions and concentrations, particle displacements and vibrations to the surrounding rocks. The decrease of k0 enhances the dynamic disturbance of transient tunnel excavation, and especially when k0 = 0.4 and 0.2, the tensile stress can be observed on the top of the tunnel. The peak particle velocity (PPV) of the measuring points on the top of the tunnel decreases with the increasing distance between the tunnel boundary and measuring point. The transient unloading wave is generally concentrated on lower frequencies in the amplitude-frequency spectrum under the same unloading conditions, especially for lower k0 values. In addition, the dynamic Mohr–Coulomb criterion was used to reveal the failure mechanism of a transient excavated tunnel by involving the loading rate effect. It is found that the excavation damaged zone (EDZ) of the tunnel is dominated by the shear failure, and the number of the shear failure zones increases with the decrease of k0. The EDZ of tunnels after transient excavations varies from ring-shape to egg-shape and X-type shear with the decrease of k0. The evolution of the EDZ induced by the transient unloading is associated with k0, i.e., the shear failure of surrounding rocks mainly occurs in the stress redistribution stage under high k0 (1.0–0.7), while the dramatic destruction of surrounding rocks is more prone to occur after the transient unloading process when k0 ≤ 0.6.

show abstract

Excavation-induced deformation and damage evolution of deep tunnels based on a realistic stress path

Cited by 35 publications

References 56 publications

Numerical Analysis for Dynamic Response of In Situ Blasting Expansion of Large Cross‐Section Tunnel with Small Net Distance

Numerical Analysis for Dynamic Response of In Situ Blasting Expansion of Large Cross‐Section Tunnel with Small Net Distance

Study of the Factors Affecting the Quality and Safety of Deep Excavations in Urban Areas of Casablanca-Settat Province-Morocco

Dynamic failure characteristics of surrounding rocks under different lateral pressure coefficients in deep tunnel transient excavation

Contact Info

Product

Resources

About