地震荷载作用下黄土的动应力–应变关系研究

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摘要对取自宁夏南部西吉县夏家大路喜家湾滑坡后缘的黄土进行动三轴试验，研究随机地震波作用下黄土的动应力–应变关系。考虑到地震输入荷载的振幅、持时、频谱成分对试验结果有较大影响，首先根据场区的宏观烈度资料，通过多元稳健回归和转换的方法，得到场区的地震烈度衰减关系和地震动衰减关系，在地震危险性分析的基础上，人工合成场地未来50 a超越概率10%的地震动时程，并据此作为输入激振波开展动力试验研究。由结果分析可见，随机地震波作用下黄土的应力–应变关系非常复杂，可以将其简化为一系列大小、位置及形状均不规则变化的椭圆形滞回圈，则任意时刻的剪切模量可以表示为该时刻的动应力、应变以及固结压力的函数，并可以将函数变化为乘幂的形式，通过多组试验验证，试验结果和公式拟合结果相关性较好。

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	邓龙胜1
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关键词 ：土力学；黄土；烈度和地震动衰减关系；人工合成地震动时程；动应力&ndash, 应变关系

Abstract：The dynamic triaxial text was carried out on the loess sample taken from Xijiawan landslide of Xiajiadalu Village in Xiji County，South of Ningxia Province，to research its dynamic stress-strain relationship acted by seismic wave. Considering the different amplitudes，durations and excellent frequencies of seismic wave having great effect on the test result，so the relationship between intensity and acceleration attenuation of the field were studied using the method of regression and conversion analysis based on its macrograph intensity data，and then，the seismic risk analysis has been carried out and the earthquake wave of the field with the 10% exceedance probability in the following 50 years was gained. The results showed that the stress-strain relationship is complicated very much，and which could be predigested as a series of ellipse loop with different sizes，stations and shapes，and the shear module could be expressed the function of dynamic stress，strain and consolidation press，which could be changed as a power function. The dynamic stress-strain relationship of loess and the function have a good correlation by a large number of tests.

Key words： soil mechanics loess relationship between intensity and acceleration attenuation man-made seismic time-history dynamic stress-strain relationship

引用本文:

邓龙胜1，范文1，2，3. 地震荷载作用下黄土的动应力–应变关系研究[J]. 岩石力学与工程学报, 2012, 31(S1): 3174-3180.
DENG Longsheng1，FAN Wen1，2，3. study of dynamic stress-strain relationship of loess under seismic loading. , 2012, 31(S1): 3174-3180.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/3174

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