本文選題：次生黃土　切入點(diǎn)：動(dòng)本構(gòu)關(guān)系　出處：《巖土工程學(xué)報(bào)》2017年S1期

【摘要】：通過(guò)室內(nèi)動(dòng)三軸試驗(yàn),研究了甘南地區(qū)次生黃土的動(dòng)本構(gòu)關(guān)系,得到了模型參數(shù),分析了甘南黃土的動(dòng)剪模量比和阻尼比發(fā)展特征,提出了動(dòng)剪切模量衰減模型和阻尼增長(zhǎng)模型;并通過(guò)歸一化處理和模型參數(shù)比較,對(duì)次生黃土與風(fēng)成黃土動(dòng)剪模量比和阻尼比的差異性進(jìn)行了討論。結(jié)果表明:次生黃土的動(dòng)本構(gòu)關(guān)系服從雙曲線模型,模型參數(shù)a值較風(fēng)成黃土無(wú)明顯差異,但b值為相同條件下風(fēng)成黃土b值的1.5~3倍,且模型參數(shù)與天然含水率、干密度等物性參數(shù)和固結(jié)圍壓不存在明顯的相關(guān)性。次生黃土的初始動(dòng)彈性模量E_(dmax)受固結(jié)條件、密度影響較大,相同條件下殘坡積黃土的E_(dmax)較沖洪積黃土小。次生黃土的動(dòng)剪模量比隨動(dòng)剪應(yīng)變?cè)龃蠖鴾p小,變化趨勢(shì)滿足負(fù)指數(shù)衰減模型;阻尼比隨動(dòng)剪應(yīng)變的增大而增大,變化趨勢(shì)服從對(duì)數(shù)關(guān)系;相比于風(fēng)成黃土,其動(dòng)剪模量比隨動(dòng)剪應(yīng)變的增加衰減更快,阻尼比增長(zhǎng)范圍較窄,表明沉積環(huán)境對(duì)黃土動(dòng)力特性的差異性影響顯著。
[Abstract]:The dynamic constitutive relationship of secondary loess in Gannan region was studied by dynamic triaxial test in laboratory. The model parameters were obtained and the development characteristics of dynamic shear modulus ratio and damping ratio of Gannan loess were analyzed. A dynamic shear modulus attenuation model and a damping growth model are proposed, and the model parameters are compared by normalization treatment. The difference of dynamic shear modulus ratio and damping ratio between secondary loess and wind-formed loess is discussed. The results show that the dynamic constitutive relation of secondary loess is based on hyperbolic model, and the parameter a of the model is not significantly different from that of wind-formed loess. But the b value is 3 times of the b value of the wind-formed loess under the same conditions, and there is no obvious correlation between the model parameters and the physical property parameters such as natural moisture content, dry density and consolidation confining pressure. Under the same condition, the density of residual loess is smaller than that of alluvial loess. The dynamic shear modulus of secondary loess decreases with the increase of dynamic shear strain, and the variation trend satisfies the negative exponential attenuation model, and the damping ratio increases with the increase of shear strain. Compared with the aeolian loess, the dynamic shear modulus decreases faster than the following shear strain, and the damping ratio increases in a narrower range, indicating that the sedimentary environment has a significant influence on the dynamic characteristics of loess.
【作者單位】： 中國(guó)地震局(甘肅省)黃土地震工程重點(diǎn)實(shí)驗(yàn)室;中國(guó)能源建設(shè)集團(tuán)甘肅省電力設(shè)計(jì)院有限責(zé)任公司;
【基金】：中國(guó)地震局地震科技星火計(jì)劃項(xiàng)目(XH16038Y) 國(guó)家自然科學(xué)基金項(xiàng)目(51408567,51478444) 甘肅省科技計(jì)劃項(xiàng)目(1308RJZA153)
【分類號(hào)】：TU444

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