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| Experimental investigation of strength and deformation characteristics of unbound permeable base materials |
| YU Qunding1，2，WANG Meng1，XIAO Yuanjie1，3，HUA Wenjun1，WANG Xiaoming1，WANG Weidong1，3，CHEN Xiaobin1，3 |
(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. Urban Rail and Underground Engineering Design and Research Institute，China Railway Siyuan Survey and Design Group Co.，Ltd.，Wuhan，Hubei 430063，China；3. MOE Key Laboratory of Engineering Structures of Heavy Haul Railway，Central South University，
Changsha，Hunan 410075，China) |
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Abstract Unbound aggregate permeable base(UPAB)materials with load-transmitting skeleton and pore structure are increasingly used due to their desired drainage performance，while how to control and optimize bearing capacity and permanent deformation of such layers under repeated applications of traffic loads remains a critical challenge to be resolved. In this study，seven different UPAB gradations were designed using the gravel to sand ratio(G/S) concept along with the conventional dense gradation as the baseline. The laboratory compaction tests and monotonic triaxial compression tests were conducted to investigate the effect of the gradation on the shear strength behavior of UPAB materials，whereas the effects of the gradation on the resilient modulus，the damping ratio and accumulated plastic deformation were studied by repeated load triaxial tests with different combinations of deviator and confining stress levels controlled by the shear stress ratio(SSR). The testing results indicate that the peak deviator stresses of specimens are different with varying gradations，and such difference becomes more significant as the confining pressure increases. The internal friction angle governs the shear strength of UPAB materials. As the number of load applications increases，the resilient modulus increases while the damping ratio decreases rapidly，and both attenuates around the 1 000-th load application. The initial damping ratio，the resilient modulus and the axial accumulative plastic strain of specimens with varying gradations increase with increasing the shear stress ratio(SSR)，and the inter-specimen differences become increasingly significant at relatively high SSR(≥0.7) levels. There exists an optimum G/S value of 1.6–1.8 that could yield the best performance in terms of achieved dry density，shear strength，resilient modulus and accumulative plastic strain. The findings could provide technical guidance and reference for cost-effective and sustainable use of UPAB materials in permeable pavements.
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2022, Vol. 41 
