The influence of in‐plane restraint on the point load resistance of fiber reinforced shotcrete

Fiber Reinforced Shotcrete (FRS) is an essential element of ground control in many types of underground structure. It has been found to be an important aid to the improvement of safety in underground spaces and is a highly effective method of ground control across a wide range of ground conditions....

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Bibliographic Details
Published in:Structural concrete : journal of the FIB 2021-02, Vol.22 (1), p.476-490
Main Authors: Reid, Stuart Grant, Bernard, Erik Stefan
Format: Article
Language:English
Subjects:
Compressive membrane action
Compressive strength
concrete
Constraints
crack widths
Elastic analysis
Fiber reinforced materials
fibers
Flexural strength
Ground based control
Linings
Load resistance
shotcrete
Sprayed concrete
Struts
Tornadoes
Underground structures
Yield line method
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Summary:Fiber Reinforced Shotcrete (FRS) is an essential element of ground control in many types of underground structure. It has been found to be an important aid to the improvement of safety in underground spaces and is a highly effective method of ground control across a wide range of ground conditions. However, the design of FRS linings remains problematic and uncertainty exists regarding the true load capacity of linings, especially with regard to out‐of‐plane load resistance. Most existing methods utilize either an elastic method of analysis or Yield Line theory to estimate load resistance, but these methods fail to account for the beneficial effect that in‐plane restraint has on load resistance. To address this short‐coming, the present research describes an experimental programme to examine the effect of Compressive Membrane Action (CMA) on the out‐of‐plane load capacity of shotcrete panels. The results demonstrate that the in‐plane restraint against dilation around a localized failure in a wall could contribute to at least a doubling of out‐of‐plane load resistance compared to estimates based on standard unrestrained beam and panel tests. Results of the experimental study have been used to develop an approximate mathematical model that describes the observed behavior with regard to the flexural strength enhancement associated with membrane compression and the contribution to load resistance associated with the development of inclined membrane struts and arching action.
ISSN:1464-4177
1751-7648
DOI:10.1002/suco.201900471