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Progressive Failure Analysis of a Concrete Dam Anchored with Passive Rock Bolts

Division of Concrete Structures, Department of Civil and Architectural Engineering, KTH the Royal Institute of Technology, 100 44 Stockholm, Sweden
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Infrastructures 2020, 5(3), 28; https://doi.org/10.3390/infrastructures5030028
Received: 30 January 2020 / Revised: 6 March 2020 / Accepted: 7 March 2020 / Published: 10 March 2020
(This article belongs to the Special Issue Advances in Dam Engineering)
Passive rock bolts are commonly used to anchor concrete dams, and they may have a significant impact on stability-evaluations. However, these bolts are often omitted from dam safety analysis due to uncertainties regarding their condition and the size of displacements required in the dam-rock interface to mobilize significant bearing forces in the passive rock bolts. This paper address the latter question by studying the failure process of a small concrete dam anchored with rock bolts. Failure simulations were performed with the increased density method in a finite element model consisting of a dam, the corresponding part of the rock and rock bolts. Two types of approaches are used to simulate the anchorage of the rock bolts; a method where the anchorage to the rock is simulated using a fixed boundary condition; and a method where the anchoring of the bolts are modelled using springs. Depending on the method of analysis, the rock bolts contribute with 40–75% of the load-carrying capacity of the dam. The rock bolts increase the load-bearing capacity of the dam, partly through anchorage forces, but also by keeping the contact surface between rock and concrete together and thereby increase the shear capacity of the interface. View Full-Text
Keywords: passive rock bolt; concrete dam; progressive failure passive rock bolt; concrete dam; progressive failure
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MDPI and ACS Style

Hellgren, R.; Malm, R.; Ansell, A. Progressive Failure Analysis of a Concrete Dam Anchored with Passive Rock Bolts. Infrastructures 2020, 5, 28.

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