夯土-水硬石灰与石英砂浆液-木锚杆锚固系统性能
Anchor performance of wood bolt fully grouted by natural hydraulic lime and quartz sand slurry
张景科 1陈鹏飞 1谌文武 1李最雄 2王南 1张帅1
作者信息
- 1. 兰州大学 西部灾害与环境力学教育部重点实验室 土木工程与力学学院，兰州 730000
- 2. 敦煌研究院 国家古代壁画与土遗址保护工程技术研究中心，甘肃 敦煌 736200
- 折叠
摘要
运用室内物理模型试验和原位试验，对基于水硬石灰与石英砂浆液的木锚杆锚固系统在夯土介质中进行了拉拔测试与杆体-浆体界面应变监测，研究了该锚固系统的锚固性能与破坏模式、杆体-浆体界面剪应变分布与传递特征。试验结果表明，该锚固系统50 cm 锚固长度可以提供30～45 kN（室内）与16．2～19 kN（现场）的极限锚固力；锚固系统具有较强的延性；在加载进程中杆体-浆体界面的应力分布与传递特征具有单峰值或双峰值分布、界面应力向锚固末端传递、压应力出现在锚固段中末端等特征，表现出复杂的受力特性。研究结果表明，该锚固系统在结构形式和力学性能上适合于夯筑土遗址加固，并与遗址体具有较好的兼容性。
Abstract
physical model and field experiments which consists of pullout test and strain monitoring on bolt-grout interface were conducted on wood bolts fully grouted by natural hydraulic lime and quartz sand slurry in rammed earth to study anchor capacity,failure mode,shear stress distribution and transfer along the bolt-grout interface . were studied on its Experimental results shows that ultimate anchor force in laboratory (30 kN~45 kN)is larger than that in field (16.2kN~19kN).Anchor system has strong ductility.In the process of loading,single-peak or double-peak stress distributes along bolt-grout interface and interfacial stress transfers toward anchor end, meanwhile,compressive stress mainly emerges at middle-end of anchor segment.With considerably physical and mechanical compatibility to rammed earth,the anchor system is suitable to conserve rammed earth heritages.
关键词
夯筑土遗址/锚杆/水硬石灰/石英砂浆液/极限锚固力/界面力学行为Key words
rammed earth construction/bolts/natural hydraulic lime and quartz sand slurry/ultimate anchor capacity/interfacial mechanical behavior引用本文复制引用
基金项目
国家自然科学基金(51108218)
国家科技支撑计划(2014BAK16B02)
出版年
2015
NETL
NSTL
维普
万方数据