土工格栅返包土工袋加筋土挡墙的地震响应分析及设计建议

朱宏伟; 姚令侃; 陈晓龙; 项琴

doi:10.11779/CJGE201702016

土工格栅返包土工袋加筋土挡墙的地震响应分析及设计建议 English Version

1. 西南科技大学环境与资源学院,四川绵阳 621010;
2. 西南交通大学土木工程学院,四川成都 610031;
3. 四川省交通运输厅交通勘察设计研究院,四川成都 610017;
4. 四川建筑职业技术学院,四川德阳 610031

基金项目: 国家自然科学基金项目(41172321); 中国铁路总公司科技研究开发计划课题（2014G004-A-6）

详细信息

作者简介:
朱宏伟(1982- ),男,甘肃人,博士,讲师,从事岩土工程抗震方面的教学和科研工作。E-mail: zhw-1-zhw@163.com。

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出版历程
- 收稿日期: 2015-12-10
- 发布日期: 2017-03-24

Seismic behaviors and design recommendations of ecological bag-reinforced retaining wall

1. School of Environment and Resources, Southwest Science and Technology University, Mianyang 621010, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
3. Sichuan Communication Surveying & Design Institute, Chengdu 610017, China;
4. Sichuan College of Architectural Technology, Deyang 618000, China

摘要

摘要: 为了研究土工袋加筋土挡墙在地震作用下的抗震性能,开展了大型的振动台模型试验。结果表明：随着加载的持续进行,挡墙模型的自振频率降低,阻尼比增加;PGA放大系数随输入地震动峰值加速度的增大而减小,墙高对PGA放大系数的影响反倒不大。土工袋加筋土挡墙的峰值动土压力呈现“中间小,两头大”的分布规律,且墙高越高,输入地震动峰值加速度越大,峰值动土压力越大,而不同地震波形的频谱差异对土压力量值和分布的影响较小。通过数值模拟研究了坡度对土工袋加筋土挡墙力学特性的影响,认为土工袋加筋土挡墙墙后侧向土压力和筋材的拉应力随着墙体坡度的增大而增大,当墙体坡度小于1∶0.75时,侧向土压力较小;当墙体坡度大于1∶0.75时,墙后土压力迅速增加,土压力的分布图式类似呈三角形分布。筋材的拉应力沿长度方向呈单峰型分布,各层筋材的拉应力随上覆填土厚度的增加而增大,但增加的幅度逐渐减小。另外,土工袋加筋土挡墙的剪应变增量、活动区范围以及位移均随墙体坡度的增大而增大。
- 土工袋加筋土挡墙 /
- 抗震性能 /
- 墙体坡度 /
- 力学特性 /
- 设计建议
Abstract: In order to study the earthquake seismic behaviors of ecological bags-reinforced wall, the large-scale shaking table model tests are performed. It is shown that the frequency decreases and the damping ratio increases with the increase of external loading. The PGA amplification factor decreases with the increase of earthquake magnitude, and the wall height has little effect. The distribution of horizontal peak dynamic soil pressures along height is of large value at both ends and small value at the middle for the ecological bag-reinforced wall, and the peak dynamic earth pressures increase as the PGA and wall height increase, the effect of frequency content characteristics of ground motions on the amount and distribution of peak dynamic earth pressures is little. The effect of slope rate on mechanical characteristics of ecological bag-reinforced wall is studied through numerical simulation. The results show that the lateral soil pressures and tensile stresses of the tied reinforcement increase with the increasing slope rate. When the slope rate is less than 1∶0.75, the lateral soil pressures increase a little, while it is greater than 1∶0.75, the lateral soil pressure increase quickly and are triangular-distributed approximately. The tensile stress of the tied reinforcement is unimodal distribution along the length, and increases with the increase of backfill depth. Moreover, the shear stress increment, sliding range and displacement increase with the increasing slope rate.
- ecological bag-reinforced wall /
- seismic behavior /
- slope rate /
- mechanical characteristic /
- design recommendation

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参考文献(16)

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