Abstract
Segmental tunnel is common in subway tunnel engineering, which is at risk of being attacked by terrorists’ bombing and accidental explosions. Due to the discreteness of segmental tunnel lining, it’s difficult to model its dynamic response to internal blast loading. In this paper, a simplified equivalent model was proposed to model the segmental tunnel lining’s vibration response to axisymmetric internal blast loading. This model can account for joints’ reduction of lining’s sectional rigidity, and concentrations of stress and strain on joints can be calculated. This research may aid in protective design and hardening measures for critical part of subway tunnels of segmental lining structure.
Highlights
Past 20 years witnessed a drastic increase in terrorist bombing attacks on subway systems in many big cities worldwide [1]
In the designing codes of segmental tunnel lining, natural hazards including seismic events and man-made disturbances like fires, etc., are generally accounted for in the designing procedure, whereas blast loading was seldom considered for civilian tunnels [2]
Where h, h are thicknesses, are Young’s moduli, is the radii of the tunnel, the subscript refers to joint bolt, while refers to concrete segment, are dimensionless ratio coefficients
Summary
Past 20 years witnessed a drastic increase in terrorist bombing attacks on subway systems in many big cities worldwide [1]. Karinski et al Recently, on the basis of matrix mechanics method, Ngoc Anh Do et al [7, 8] studied the behaviour of segmental linings under pseudo-static seismic loading Most of these researches are for loads from outside, i.e. static loads from rock or soil strata weights and water pressure, or seismic loading which can be treated as equivalent static loading. Matteo Colombo et al [9, 10] studied internal blast effects on segmental tunnel with equivalent beam elements modelling ring joints and linear elastic springs to simulate ground-lining interaction, which showed that under internal blast pressure the lining is subjected to tensile force in circumferential direction. This research may aid in explosion hazard assessment and protective design of some critical subway tunnels
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