基于水硬石灰与粉煤灰浆液的木锚杆锚固性能试验  

Anchor performance of wood bolts fully grouted by natural hydraulic lime and fly ash slurry

作　　者：王南[1] 张景科[1] 谌文武[1] 李最雄[2] 孙满利[3] 陈鹏飞[1] 

机构地区：[1]兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室,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 [3]西北大学文化遗产学院,西安710069

出　　处：《兰州大学学报（自然科学版）》2016年第3期313-319,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(51108218);国家科技支撑计划项目(2014BAK16B02)

摘　　要：采用室内模型试验与现场试验相结合的方法,研究水硬石灰拌合粉煤灰浆液的木锚杆锚固性能：锚固系统的失效模式、杆体-浆体界面应变与荷载时程关系及传递关系.通过对拉拔力的检测,室内模型可以提供21～30 kN的极限锚固力,现场锚固系统可以提供6.94～16.00 kN的极限锚固力.通过对杆体-浆体界面应变监测,锚固系统表现出低弹性、高塑性的特征.在荷载进程中,杆体-浆体界面的应力分布与传递特征具有单峰值分布、高值出现在锚固末端、压应力出现等特点,呈现出拉力型和压力型全长黏结锚固系统的特点.研究结果为更合理地夯土遗址锚固设计提供科学基础.Anchor performance of wood bolts fully grouted by natural hydraulic lime and fly ash slurry in rammed earth was studied by using the laboratory model method combined with field experiments, which con- sisted of the failure mode, time-history and transmission relation between strain and load along the bolt-grout interface. Based on pullout test and strain monitoring on bolt-grout interface, experimental results showed that the ultimate anchor force in laboratory （21-30 kN） was larger than that in field （6.94-16.00 kN）. Low elastic de- formation and high plastic deformation of anchor system resulted in strong ductility. In the process of loading, single-peak stress was distributed along bolt-grout interface and higher stress value usually appeared near the anchor end, compressive stress occasionally emerged along the monitoring interface. The results to some extent proved that such an anchor system benefits from the advantages of both the tensile anchor and compressive anchor. The research provides a scientific basis for a more reasonable anchor design for the conservation of rammed earthen sites.

关 键 词：夯土遗址 木锚杆 水硬石灰 锚固性能 界面力学行为 

分 类 号：TU746[建筑科学—建筑技术科学]