夯筑土遗址中基于PS-(F+C)浆液的木锚杆锚固性能  

Anchor Performance of Wood Bolt Fully Grouted by PS-( F + C) Slurry in Rammed Earth Sites

作　　者：张景科[1] 王南[1] 谌文武[1] 李最雄[2] 郭青林[2] 陈鹏飞[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州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

出　　处：《四川大学学报（工程科学版）》2015年第4期52-60,共9页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然青年科学基金资助项目(51108218);国家科技支撑计划课题资助项目(2014BAK16B02)

摘　　要：基于室内物理模型试验和原位锚固试验,对基于高模数硅酸钾溶液-（粉煤灰＋粉土）（PS-（F＋C））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-浆体界面剪应力分布与传递特征。结果表明：该锚固系统室内试验极限锚固力（24～38 k N）远大于现场试验值（2.5～8 k N）;锚固系统具有低弹性强塑性特征,表现出极强的延性;在荷载进程中杆体-浆体界面的应力分布与传递特征具有多峰值分布、高值往往出现在锚固末端、压应力出现等特征,表明该锚固系统兼有拉力型和压力型全长黏结性锚固系统的特点;该系统适合于夯筑土遗址锚固,与遗址具有良好的物理力学兼容性。Based on laboratory physical model and field experiments which consisted of pullout tests and strain monitoring on bolt-grout interface,wood bolts fully grouted by potassium silicate solution-（ fly ash ＋ silt）（ PS-（ F ＋ C）） slurry in rammed earth were researched on its anchor capacity,failure mode,shear stress distribution and transfer along the bolt-grout interface. Experimental results showed that ultimate pullout force in laboratory（ 24 ～ 38 k N） is far larger than that in field（ 2. 5 ～ 8 k N）. Low elastic deformation and high plastic deformation of anchor system result in strong ductility. In the process of loading,multi-peak stress distributes along bolt-grout interface and higher stress value usually appears near anchor end,meanwhile,compressive stress occasionally emerges in monitoring interface. Results proved that such anchor system benefits from advantages of both the tensile anchor and compressive anchor. In conclusion,with considerably physical and mechanical compatibility to rammed earth,the anchor system is fairly suitable to conservation of rammed earth sites.

关 键 词：夯筑土遗址 木锚杆 高模数硅酸钾溶液-(粉煤灰+粉土)(PS-(F+C))浆液 极限锚固力 界面剪应力传递 

分 类 号：TU347[建筑科学—结构工程]