大应变下干燥橡胶砂动力特性试验研究

doi:10.13722/j.cnki.jrme.2016.0193

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摘要橡胶颗粒–砂混合物(橡胶砂)作为一种廉价耗能材料应用广泛，但关于其在大应变幅值范围内的模量和阻尼比特性的研究较少。本文应用循环单剪试验，对7种配比的干燥橡胶砂在4种固结压力下的动剪模量和阻尼比特性进行研究，得到其在10－3～10－1应变幅值范围的变化规律。结果表明，橡胶砂在大应变下：(1) 动剪模量相对于纯砂动剪模量衰减，衰减系数随着橡胶含量的增大而降低，随着动应变幅值的增大而减小。(2) 阻尼比相对于纯砂阻尼比呈增大趋势，增大系数随着橡胶含量的增大而增大，随着应变幅值的增大而减小。(3) 固结压力对橡胶砂相对于纯砂动剪模量衰减系数影响较小，但对阻尼比增大系数影响较明显，表现为固结压力越高，阻尼比增大越多，随着动剪应变幅值增大，固结压力对阻尼比影响减小。(4) 循环次数对橡胶砂动剪模量和阻尼比影响明显，随着橡胶含量的增加，此影响减小。

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	刘方成1
	杨峻2
	王海东3

关键词 ：土力学, 橡胶砂, 动剪模量, 阻尼比, 大应变, 循环单剪试验

Abstract：Rubber sand mixture(RSM) has been recognized useful widely in civil engineering as low cost material for energy absorbing and isolating，while little research has been done on dynamic shear modulus and damping ratio of it in large strains. Cyclic simple shear tests on dry RSM with seven rubber content and four vertical consolidation pressure are introduced in this paper，and general rules on dynamic shear modulus and damping ratio of RSM at large strain range 10－3–10－1 are introduced. Results on RSM dynamics properties at large strain indicate that：(1) Dynamic shear modulus of RSM decays relative to that of pure sand，and the decay coefficient decrease with the increase of rubber content as well as with the increase of shear strain amplitude. (2) Damping ratio of RSM is amplified comparing with that of pure sand，the amplification coefficient increases with rubber content while decreases with shear strain amplitude. (3) Vertical consolidation pressure affects little on shear modulus decay coefficient of RSM to pure sand versus rubber content，while influences significantly damping ratio amplification coefficient of RSM to pure sand versus rubber content，that is damping ratio amplification coefficient increases with vertical consolidation pressure. With the increase of shear strain amplitude，influence of vertical consolidation pressure on damping amplification attenuates. (4) Both dynamic shear modulus and damping ratio are influenced obviously by shear cycle numbers，and it seems that the effect decreases with rubber content.

Key words： soil mechanics rubber sand mixture(RSM) dynamic shear modulus damping ratio large strains cyclic simple shear tests

引用本文:

刘方成1，杨峻2，王海东3. 大应变下干燥橡胶砂动力特性试验研究[J]. 岩石力学与工程学报, 2016, 35(S2): 4265-4278.
LIU Fangcheng1，YANG Jun2，WANG Haidong3. Experimental study on dynamic characteristics of dry rubber-sand mixture at large strains. , 2016, 35(S2): 4265-4278.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0193 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4265

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