摘要
土工合成材料加筋土边坡在我国西藏高海拔强震区基础设施建设中的应用正逐渐增加,不同坡面形式在加筋土边坡遭遇地震时发挥的保障效果各异,但以往针对不同坡面形式加筋土边坡抗震性能的研究较为缺乏。因此,通过开展土工袋和格宾笼护坡的加筋土边坡振动台模型试验,研究不同地震峰值加速度作用下坡面形式对土工格栅加筋土边坡动力响应特征的影响,重点关注地震作用下边坡加速度放大系数、坡面位移、坡顶沉降以及筋材轴力等分布规律。试验结果表明:加筋土边坡各处加速度放大系数均随高度的增大而增大,坡面形式对加速度放大系数的影响很小;整体上坡面峰值位移随高度增加而逐渐增大,除边坡顶部外,格宾笼组峰值位移小于土工袋组,且震后坡面位移得到了一定程度的恢复;坡顶沉降随地震峰值加速度的增大逐渐增大,格宾笼组的坡顶沉降大于土工袋组;土工袋组筋材轴力整体上大于格宾笼组,地震作用下顶部筋材轴力增量最大;在1.0g地震峰值加速度下,采用土工袋及格宾笼护坡的土工格栅加筋土边坡均具有良好的抗震性能。
Applications of geosynthetic-reinforced soil(GRS)slopes in infrastructure construction in high-altitude strong earthquake areas of Tibet,China are gradually increasing.Different slope face patterns have different security effects when GRS slopes encounter earthquakes,but the previous studies on aseismic performance of GRS slopes with different slope face patterns are relatively lacking.Here,shaking table model tests for GRS slopes with geotextile bags and gabion cages were conducted to study effects of slope face patterns on dynamic response characteristics of geogrid GRS slopes under different seismic peak accelerations,especially,distribution laws of slope acceleration amplification coefficient,slope displacement,slope top settlement and geogrid axial force under earthquake action were examined.The experimental results showed that acceleration amplification factors at various locations of GRS slopes increase with increase in height,and slope face pattern has little effect on acceleration amplification factor;peak displacements of overall upper slope surface gradually increase with increase in height,except for slope top,peak displacements of gabion cage group are smaller than those of geotextile bag group,and post-earthquake slope displacements are partially restored;slope top settlements gradually increase with increase in seismic peak acceleration,and slope top settlements of gabion cage group are larger than those of geotextile bag group;overall axial force of geotextile bag group reinforcement is larger than gabion group reinforcement’s,and axial force increment at reinforcement top is the largest under earthquake action;under peak earthquake acceleration of 1.0 g,both geogrid reinforced soil slopes using geotextile bags and gabion cages all have good aseismic performance.
作者
孟亚
徐超
杨阳
马林
韦小当
贾斌
MENG Ya;XU Chao;YANG Yang;MA Lin;WEI Xiaodang;JIA Bin(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;East China Electeric Power Design Institute Co.,Ltd.of China Power Engineering Constulting Group,Shanghai 200063,China)
出处
《振动与冲击》
北大核心
2025年第9期195-202,共8页
Journal of Vibration and Shock
基金
国家自然科学基金项目(41772284)
中国电力工程顾问集团华东电力设计院有限公司科研项目(30-K2023-G01)。
关键词
土工格栅
加筋土边坡
坡面形式
振动台试验
抗震性能
geogrid
reinforced soil slope
slope face pattern
shaking table test
aseismic performance
