Evaluation of Seismic Performance for Tunnel Retrofit Project

Law, Hubert; Lam, Ignatius Po

doi:10.1061/(asce)1090-0241(2003)129:7(575)

Cited by 18 publications

(4 citation statements)

References 2 publications

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“…There are many stability analysis methods of key block, such as stereographic projection diagram method, body proportion orthogyaphic projection method and key block theory proposed by Shi et al 1 . In order to effectively solve the stable reliability problem of key block, researchers have proposed various theories, modes and solutions in recent years 2–11 . Considering present research, the stability factor of key block without supporting measures can easily be solved by analytical solution.…”

Section: Introductionmentioning

confidence: 93%

GPR‐MCS model of reliability analysis of key blocks and its engineering application

Wang

et al. 2021

Num Anal Meth Geomechanics

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Reasonable rock bolting schemes for potentially unstable blocks should be proposed and optimized in order to prevent rockfall hazard during tunnel construction. However, the reliability index of key block caused by uncertainty of geometric and mechanics parameters is not easy to be obtained by numerical simulation. Since the performance function of stability analysis of supporting key block is too complex, it is also difficult to calculate the reliability by using analytical and graphic methods rapidly. In this paper, the Gaussian process regression (GPR) model was established instead of the explicit function of key block. The safety factor of supporting key block calculated by UnWedge procedure was taken as the sample output of response model. With the GPR model coupling Monte Carlo Simulation (GPR‐MCS), the failure probability of key block could be predicted rapidly. The reliability of key block with different supporting schemes were analyzed, and the optimization of support parameters for key block was also carried out. It has direct meaning to prevention and control of dangerous key block during tunnel construction.

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Section: Introductionmentioning

confidence: 93%

GPR‐MCS model of reliability analysis of key blocks and its engineering application

Wang

et al. 2021

Num Anal Meth Geomechanics

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“…This situation should be taken into consideration in the design. Information about concrete lining that used to this study was obtained from [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23] theoretical, analytical and experimental studies. These studies guided the study.…”

Section: Introductionmentioning

confidence: 99%

Structural Retrofitting of Existing Stone Siphon by Internally Concrete Lining

2023

International Conference on Innovative Academic Studies

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Nowadays, the devastating effects of natural disasters and methods of protection from these effects are very popular. In the field of civil engineering, the issue of protecting structures against natural disasters has always been on the agenda. For this reason, research on the protection of all building types against natural disasters is of vital importance. It seems that stone siphons, especially those used for irrigation purposes, are negatively affected by earthquakes. As a result of this situation, problems are encountered in accessing water and flowing water. Post-disaster modal performance levels of stone siphons should be examined and as a result, appropriate retrofitting techniques should be applied according to the structure type, damage and regional conditions. Various retrofitting methods are available to increase the seismic performance and stiffness of stone siphons. The retrofitting method with concrete lining also stands out as an alternative, simple and popular. For all these reasons, this study focused on retrofitting stone siphon with concrete lining. A stone siphon model was created with the finite element method and modal analysis was performed. Then, the same model was retrofitted with concrete lining and modal analysis was performed. When the results obtained were compared, it was seen that retrofitting with concrete lining significantly increased the stone siphon rigidity. In light of all these findings, it is recommended to retrofit concrete lining for stone siphons.

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“…With continuous modifications and improvements, twodimensional (2-D) DDA has been more efficient and suitable to cover practical engineering problems of rockfall, 4-7 landslide, [8][9][10][11][12][13][14][15][16] tunneling and mining, [17][18][19][20][21] cavern and underground opening, [22][23][24][25][26][27] masonry structure, [28][29][30] fracture propagation, 31,32 rock blasting [33][34][35] and many others. [36][37][38][39][40][41][42] However, the applications of 2-D DDA are inappropriate to many practical problems because the majority of discontinuities are not always perpendicular to the cross-section of the model.…”

Section: Introductionmentioning

confidence: 99%