透水性基床级配碎石填料强度变形特性试验研究

doi:10.13722/j.cnki.jrme.2021.0004

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摘要空隙结构良好的级配碎石因其良好的渗透性而逐渐用作透(排)水性基床结构层，但合理地控制和优化其在交通荷载重复作用下的强度和累积变形特性是亟待解决的关键问题之一。采用基于颗粒堆积理论提出的石砂比(G/S)指标设计7种不同的透水性级配以及用于对比的常规级配，分别开展室内击实试验和单调加载三轴试验研究级配对压实和强度特性的影响；通过控制剪应力比(SSR)设计重复加载三轴试验的不同围压和循环偏应力组合，研究级配对回弹模量、阻尼比和累积塑性变形等的影响。试验结果表明：不同级配试样的峰值偏应力存在差异，围压越大差异越明显，抗剪强度主要受内摩擦角控制；随加载次数增加，回弹模量迅速增大，阻尼比迅速下降，两者均在1 000次左右趋于平缓；不同级配试样的初始阻尼比、回弹模量和轴向累积塑性应变随剪应力比的增大而增大，剪应力比较高(SSR≥0.7)时差异越大；G/S = 1.6～1.8时透水性级配碎石处于稳定的骨架结构状态，干密度、抗剪强度、回弹模量、阻尼比和累积塑性变形等均最优。可为透水性基床级配碎石的高效利用和可持续推广提供理论依据和技术参考。

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	于群丁1
	2
	王萌1
	肖源杰1
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	华文俊1
	王小明1
	王卫东1
	3
	陈晓斌1
	3

关键词 ：岩石力学, 三轴试验, 透水性基床, 抗剪强度, 回弹模量, 阻尼比, 累积塑性应变

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.

Key words： rock mechanics triaxial test permeable base shear strength resilient modulus damping ratio accumulated plastic strain

引用本文:

于群丁1，2，王萌1，肖源杰1，3，华文俊1，王小明1，王卫东1，3，陈晓斌1，3. 透水性基床级配碎石填料强度变形特性试验研究[J]. 岩石力学与工程学报, 2022, 41(3): 614-630.
YU Qunding1，2，WANG Meng1，XIAO Yuanjie1，3，HUA Wenjun1，WANG Xiaoming1，WANG Weidong1，3，CHEN Xiaobin1，3. Experimental investigation of strength and deformation characteristics of unbound permeable base materials. , 2022, 41(3): 614-630.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0004 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I3/614

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