地震作用下锚索框架梁边坡的振动台模型试验研究  

Study on Anchor-frame Beam Supported Slope under the Action of Earthquake by Shaking Table Model Test

作　　者：林翔 陈永明 杨肖年 LIN Xiang;CHEN Yongming;YANG Xiaonian(China Three Gorges Corporation Fujian Energy Investment Co.,Ltd.,Fuzhou 350000, China)

机构地区：[1]长江三峡集团福建能源投资有限公司,福州350000

出　　处：《路基工程》2019年第2期192-196,共5页Subgrade Engineering

摘　　要：以海西福永高速公路某标段预应力锚框支护土岩二元结构边坡工程为依托,通过模型试验法在大型振动台作用下对锚索-框架梁支护下的土岩二元结构边坡的地震响应规律进行了研究。结果表明:沿坡高方向向上,PGA放大系数呈递增趋势,表现出明显的"趋表效应"和"鞭梢效应";地震强度等级较高情况下,土体的塑性特征非常明显;地震波频谱特征不同导致加速度峰值放大系数存在差异并随坡高变大而呈现变小的趋势,最终在边坡坡顶处逐渐趋于一致。Based on the soil-rock dual structural slope supported by prestressed anchor-frame in a section of Fuzhou-Yongtai Highway in West-straits Economic Zone, the seismic response law of the slope was studied by large-scale shaking table model test. The result shows that, when going up along the slope elevation, PGA amplification factor shows an increasing trend with obvious‘skin effect’and‘whipping effect’;in case of relatively high earthquake intensity scale, the soil mass exhibits distinct plastic characteristics;due to the different spectrum features of seismic wave, PGA amplification factor has discrepancies and trends to be smaller as the slope elevation increases, and then gradually converged towards the slope top.

关 键 词：边坡工程 锚框支护 地震动力响应 振动台 模型试验 

分 类 号：U416.14[交通运输工程—道路与铁道工程]