Abstract Based on the analysis of squeezing of weak rock under high in situ pressure, as a basic concept for dealing with squeezing problem, the“yielding principle”is pointed out in the paper, and relevant techniques for deformation releasing under a constant resistance are introduced moreover. Meanwhile the function difference between prestress anchorage cables and untensioned rock bolts are discussed and appraised. In other hand, for dealing with residual deformation, a suggestion is to arrange high deformation (compressible) fillings between the primary support and the extrados of the second lining in order to flexibly choose the timing of the second lining.
Abstract：
Based on the analysis of squeezing of weak rock under high in situ pressure, as a basic concept for dealing with squeezing problem, the“yielding principle”is pointed out in the paper, and relevant techniques for deformation releasing under a constant resistance are introduced moreover. Meanwhile the function difference between prestress anchorage cables and untensioned rock bolts are discussed and appraised. In other hand, for dealing with residual deformation, a suggestion is to arrange high deformation (compressible) fillings between the primary support and the extrados of the second lining in order to flexibly choose the timing of the second lining.
WANG Jianyu
.“Resistance”or“Yielding”?Discussion on the Basic Concept for Dealing with Rock Squeezing Problems[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(3): 1-7
2024, Vol. 61 