负温对土动剪切模量阻尼比的影响规律

doi:10.13722/j.cnki.jrme.2015.1176

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摘要以我国引进的首台低温共振柱仪为依托，研究不同负温下冻结土的初始剪切模量、剪切模量比和阻尼比非线性曲线的变化规律和模式。对低温共振柱仪试验技术进行研究，结果显示，采用常温试验方法进行低温共振柱试验，会导致结果离散过大，通过试验确定围压介质、冻结时间等试验条件和参数。同时，采用更符合客观实际的围压、固结和冻结方式，以粉土为样本，在室温和不同负温下进行对比试验。结果表明：负温对土的初始模量和剪切模量比影响显著，0 ℃～－4.0 ℃为敏感段，－4.0 ℃后为平稳段；敏感段内，随负温增加，初始剪切模量呈Boltzmann函数形式急速增加，参考剪应变则呈Boltzmann函数形式迅速下降，平稳段上，二者随负温增加分别平稳上升和下降；负温下阻尼比曲线在剪应变小于一定值时高于常温曲线，而在大于该应变时常温试验曲线则超过负温曲线；负温对最大阻尼比有较大影响，随负温增大，最大阻尼比呈指数形式降低。该试验采用专门的低温共振柱仪完成，围压、固结和冻结条件更接近客观实际，得到的负温对土动剪切模量阻尼比的影响模式更真实可靠，可为季冻土区抗震规范中设计谱修正以及季冻土区重大工程抗震设计中获得合理地震动输入提供依据。

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	于啸波1
	孙锐1
	袁晓铭1
	孟上九1
	2
	王淼1
	孙义强2

关键词 ：土力学, 低温共振柱试验, 围压介质, 冻结时间, 初始剪切模量, 剪切模量比, 阻尼比

Abstract：The initial shear modulus，modulus ratio and damping ratio of frozen soil at different negative temperatures were experimentally investigated with the low temperature resonant column apparatus(LTRCA). The test results showed that conventional resonant column testing applied to the low- temperature samples resulted in large errors. The test parameters such as the frozen duration and the confining medium were determined. The negative temperature was found to have significant impact on the initial modulus and shear modulus ratio which was sensitive between －4 ℃ to 0 ℃ and stayed stable when lower than －4 ℃. When the temperature decreased in the sensitive interval，the initial modulus increased rapidly obeying the Boltzmann function，while the reference strain decreased sharply obeying also the Boltzmann function. In the stable interval，they changed smoothly. Below a certain strain，the damping ratio at the normal temperature was lower than that at low temperature. When the strain exceeded a certain strain，the damping ratio of normal test was larger than that of low temperature test. The negative temperature had significant influence on the maximum damping ratio，which decreased exponentially with the temperature decreasing.

Key words： soil mechanics low temperature resonant column test confining medium freezing duration initial shear modulus shear modulus ratio damping ratio

引用本文:

于啸波1，孙锐1，袁晓铭1，孟上九1，2，王淼1，孙义强2. 负温对土动剪切模量阻尼比的影响规律[J]. 岩石力学与工程学报, 2016, 35(7): 1452-1465.
YU Xiaobo1，SUN Rui1，YUAN Xiaoming1，MENG Shangjiu1，2，WANG Miao1，SUN Yiqiang2. Influence of negative temperature on dynamic shear modulus and damping ratio of soil. , 2016, 35(7): 1452-1465.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.1176 或 http://www.rockmech.org/CN/Y2016/V35/I7/1452

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