路基填土挤扩锚杆现场试验研究  

Field Text Study on Squeeze⁃expansion Anchor Rods for Subgrade Filling

作　　者：王安福 张玉芳 廖小平 牛文庆[5,6] 聂希亦[5,6] WANG Anfu;ZHANG Yufang;LIAO Xiaoping;NIU Wenqing;NIE Xiyi(Guangdong Communications Group Co.Ltd.,Guangzhou 510630,China;Railway Engineering Research Institute,CARS,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,Beijing 100081,China;China Railway Academy Co.Ltd.,Chengdu 610036,China;Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;Northwest Research Institute Co.Ltd.of China Railway Engineering Corporation,Lanzhou 730000,China)

机构地区：[1]广东省交通集团有限公司,广州510630 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]高速铁路轨道系统全国重点实验室,北京100081 [4]中铁科学研究院有限公司,成都610036 [5]中国铁道科学研究院研究生部,北京100081 [6]中铁西北科学研究院有限公司,兰州730000

出　　处：《铁道建筑》2024年第8期136-141,共6页Railway Engineering

基　　金：广东省交通集团科技项目(JT2020YB12);中铁西北科学研究院有限公司科研项目(2023XBK02);中国铁道科学研究院集团有限公司院基金(2022YJ126)。

摘　　要：以汕湛(汕头—湛江)高速公路揭博(揭西—博罗)段的水毁边坡应急抢险工程为依托,开展了路基填土挤扩锚杆现场试验,对比研究了普通锚杆、单盘挤扩锚杆和双盘挤扩锚杆结构力学特性。结果表明:普通锚杆其锚固段前3 m(自锚杆自由段与锚固段接触点起向锚固段延伸至3 m)承受的拉力占比为33.35%;单盘锚杆锚固段前3 m承受的拉力占比为56.65%,双盘锚杆锚固段前3 m承受的拉力占比为61.50‰;单盘锚杆实测极限抗拔承载力为普通锚杆的1.89倍,双盘锚杆为普通锚杆1.73倍;单盘锚杆、双盘锚杆与普通锚杆相比塑性位移占比较低,变形控制效果良好;单盘挤扩锚杆和双盘挤扩锚杆具有良好的工作特性,适合于承受较高荷载的工程应用。Based on the emergency rescue project of the water damaged slope in the Jiexi-Boluo section of the Shantou-Zhanjiang Expressway,field tests were conducted on the subgrade filling and squeeze-expansion anchor rods.The mechanical characteristics of ordinary anchor rods,single-plate squeeze-expansion anchor rods,and double-plate squeeze-expansion anchor rods were compared and studied.The research results show that the proportion of tensile force borne by ordinary anchor rods in the first 3 m of the anchorage section(from the end point of the free section of the anchor rod to the anchorage section to 3 m)is 33.35%.The proportion of tensile force borne by the first 3 m of the single-plate anchor rod anchorage section is 56.65%,while the proportion of tensile force borne by the first 3 m of the double-plate anchor rod anchorage section is 61.5‰.The measured ultimate pull-out bearing capacity of single-plate anchor rod is 1.89 times that of ordinary anchor rod,and the measured ultimate pull-out bearing capacity of double-plate anchor rod is 1.73 times that of ordinary anchor rod.Compared with ordinary anchor rods,single-plate anchor rods and double-plate anchor rods have a lower proportion of plastic displacement and good deformation control.Single-plate anchor rods and double-plate anchor rods have good working characteristics and are suitable for engineering applications that can withstand high loads.

关 键 词：路基填土 挤扩锚杆 现场试验 挤扩支盘 极限抗拔承载力 

分 类 号：TU431[建筑科学—岩土工程]