Experimental Study on Deterioration of Interlayer Interface of Double-block Ballastless Track in Hygrothermal Environment
The interlayer interface between the track slab and supporting layer is a weak component of double-block ballastless track,which is inevitably deteriorated by hygrothermal environmental during the operation.Accurate e-valuation of the degradation of interlayer interfaces is of great significance to ensure the safe operation and optimize the structure design of double-block ballastless track.The performance deterioration of composite specimen of dou-ble-block ballastless track under different hygrothermal environments was studied by accelerated testing.The influ-ences of deterioration time and temperature on the splitting tensile strength,shear strength,and interlayer interface deterioration depth of the composite specimens were analyzed in detail.The results indicate that the deterioration depth of interlayer interface of double-block ballastless track is directly proportional to the square root of the deteri-oration time;The higher the temperature,the greater the deterioration rate;The longer the deterioration time,the lower both the splitting tensile strength and shear strength;Moreover,temperature would exacerbate the decrease in strength of composite specimens,and the deterioration effect of temperature on strength is more significant for a longer deterioration time;The relative strength of composite specimen of double-block ballastless track exhibits a linearly decreasing relationship with the deterioration depth of interlayer interface.
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