土工袋挡土墙动力特性影响因素试验  

Tests on factors of dynamic characteristics of retaining walls constructed with soilbags

作　　者：李玲君[1] 刘斯宏[2] 徐小东[2] 张雨灼 

机构地区：[1]江苏省交通规划设计院股份有限公司,江苏南京210014 [2]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电科技进展》2015年第6期41-46,共6页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51379066);江苏高校优势学科建设工程项目(YS11001)

摘　　要：为了解土工袋挡土墙这一新型柔性挡土墙的动力特性,通过小型振动台模型试验,研究了地震三要素(输入加速度、振动频率、振动持续时间)以及土工袋大小对以天然河砂为填料的土工袋挡土墙动力特性的影响,分析了水平位移、动土压力以及加速度的变化规律。试验结果表明,输入加速度越大,振动频率越低,土工袋挡土墙位移与动土压力系数越大,加速度响应则随着输入加速度和振动频率的增大而增大,而振动持续时间对土工袋挡土墙的动力特性影响不大;与普通大小的土工袋相比,由大土工袋构筑的挡土墙抗震性能略差,但施工方便快捷,效率较高,可应用于抗震要求较低的地区或者工期较紧的工程。In order to understand dynamic characteristics of the new-type flexible retaining walls constructed with soilbags, small-scale shaking table model tests were conducted on retaining walls constructed with soilbags filled with natural sands. The effects of three elements of earthquakes, input accelerations, vibration frequencies, and vibration durations, as well as the size of soilbags, on the retaining walls were investigated, and change patters of horizontal displacements, dynamic earth pressures, and accelerations were analyzed. The results show that displacements of retaining walls and pressure coefficients of dynamic earth increase with the increase of input accelerations and the decrease of vibration frequencies, while the acceleration response increases with the increase of both input accelerations and vibration frequencies. However, the effects of vibration durations on dynamic characteristics are relatively small. In addition, compared with retaining walls constructed with normal-size soilbags, the seismic performance of retaining walls constructed with larger bags is slightly poorer. However, larger soilbags can be used in areas with lower seismic requirements or projects with tight schedules because of their ease of construction and high efficiency.

关 键 词：土工袋挡土墙 动力特性 地震加速度 振动频率 动力持时 振动台模型试验 

分 类 号：TU476.4[建筑科学—结构工程]