输电线路岩石锚杆基础试验研究  

Experimental study on rock anchor foundation in transmission lines

作　　者：郑卫锋[1] 鲁先龙[1] 程永锋[1] 冯自霞[1] 

机构地区：[1]中国电力科学研究院工程力学研究所,北京100055

出　　处：《工程勘察》2010年第1期5-8,共4页Geotechnical Investigation & Surveying

基　　金：国家电网公司科技项目(SGKJ[2007]1006;SGKJ[2007]1027)

摘　　要：岩石锚杆基础已逐渐在输电线路工程中获得广泛应用,针对节理裂隙发育的灰质板岩岩体,进行了现场拉拔真型试验。试验结果表明:在满足锚筋自身强度的情况下,应以锚孔表面混凝土的位移值来确定基础的极限荷载;当锚杆达到一定长度后,再单纯依靠增加锚杆长度提高极限抗拔承载力效果甚微;适当改善锚筋外表面的粗糙度可提高锚筋与混凝土间的界面粘结强度;在岩石锚杆基础设计中要注意群锚效应的削弱作用。The rock anchor foundation could be widely used for the practical engineering in mountain area transmission lines. Aiming at the jointed and fractured grayer slate, the field prototype tests have been carried out for a 500kV electric power transmission line in Beijing mountain areas. It is shown that the ultimate uplift bearing capacity should be determined by the concrete surface displacement above the anchor hole. Further study shows that the ultimate uplift bearing capacity of the anchor bolts increase little as the anchorage lengths exceed a limited length. The interracial bonding strength of steel bar and concrete could be improved by changing the surface roughness of reinforced steel bars. In the design of rock anchor foundation, the anchorage effect should be taken account for the weakening function of the capacity.

关 键 词：输电线路 岩石锚杆基础 极限抗拔承载力 群锚效应 

分 类 号：TM75[电气工程—电力系统及自动化] TU47[建筑科学—结构工程]