【摘要】：在調(diào)查山西地震動歷史事件的基礎(chǔ)上,對山西汾渭地塹帶上高速公路邊坡黃土進行了動力特性參數(shù)的試驗研究。首先,選取典型黃土邊坡進行現(xiàn)場爆破試驗獲取了邊坡黃土介質(zhì)的地震動時程曲線;接著,以這些動力特性作為動三軸試驗的模擬加載方式和參數(shù),對不同路段邊坡的30組馬蘭黃土(Q3)和離石黃土(Q2)進行了室內(nèi)動三軸試驗,獲得了邊坡黃土在低震多頻動荷載下動力特性的一些規(guī)律:沖擊地震荷載作用下加速度幅值比正弦循環(huán)波幅值較大;相同的動荷載作用下,動彈性模量(Ed)越大,黃土的動黏聚力(Cd)越高,動摩擦角(φd)則越低,離石黃土(Q2)與馬蘭黃土(Q3)的初始動彈性模量(Ed0)分別為80~150 kPa、25~100 kPa;動彈性模量均值(Eda)分別為10~20 kPa,10~30 kPa;對二者的動應(yīng)變(εd)-動阻尼比(λd)曲線擬合得動阻尼比(λd)的增長速率分別為馬蘭黃土(Q3)0.199 8,離石黃土(Q2)為0.128 5。
[Abstract]:Based on the investigation of historical events of ground motion in Shanxi Province, the dynamic characteristic parameters of loess on highway slope in Fen-Wei graben belt of Shanxi Province are studied experimentally. Firstly, the time-history curve of loess soil motion is obtained by field blasting test of typical loess slope, and then, these dynamic characteristics are used as the simulation loading mode and parameters of dynamic triaxial test. The dynamic triaxial tests of 30 groups of Ma Lan loess (Q3) and Lishi loess (Q2) on different sections of slope were carried out. Some laws of dynamic characteristics of loess slope under low seismic and multi-frequency dynamic loads are obtained: the amplitude of acceleration under impact earthquake is larger than that of sinusoidal cyclic wave, and the dynamic modulus of elasticity (Ed) is larger under the same dynamic load. The higher the dynamic cohesive force (Cd) of loess is, the lower the dynamic friction angle (蠁 d) is. The initial dynamic modulus of elasticity (Ed0) of Lishi loess (Q2) and Ma Lan loess (Q3) were 80 ~ 150 kPa,25~100 kPa;, respectively. The mean value of dynamic modulus of elasticity (Eda) was 10 ~ 20 kPa,10~30 kPa;. The dynamic strain (蔚 _ d) -dynamic damping ratio (位 _ d) curve fitting of Lishi loess (Q _ 2) and Ma Lan loess (Q _ 3) obtained the growth rate of dynamic damping ratio (位 _ d). Ma Lan loess (Q3) 0.199 8, Lishi loess (Q2) 0.128 5.
【作者單位】： 太原理工大學(xué)地球科學(xué)與工程系;山西冶金巖土工程勘察總公司;長安大學(xué)地質(zhì)工程與測繪學(xué)院;山西省交通科學(xué)研究院巖土工程研究所;
【分類號】：P315.9;U416.14

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