软土地层扩体锚索极限抗拔承载力特性及其改进措施研究  

Study on Ultimate Pullout Bearing Capacity of Underreamed Anchor Cable in Soft Soil and Its Improvement Measures

作　　者：王铭 WANG Ming(Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]上海隧道工程有限公司,上海200032

出　　处：《建筑施工》2024年第5期711-714,共4页Building Construction

摘　　要：为解决软弱土层中预应力锚索抗拔承载力不足的问题,依托实际工程,通过现场拉拔试验,对比分析扩体锚索和普通锚索的极限抗拔承载力,并研究影响扩体锚索抗拔力的因素,提出相应改进措施,为同类工程提供理论依据与改进思路。结果表明:扩体锚索相比普通锚索的极限抗拔承载力可提高20%~40%,在软土地层具有更好的适用性;提出的改进措施可有效控制软弱土层中锚索抗拔力不足的各种因素,使扩体锚索的极限抗拔承载力提高40%以上;工程应用数据证明,扩体锚索能有效控制基坑位移,具有较好的工程应用效果。In order to solve the problem of insufficient pullout bearing capacity of prestressed anchor cable in soft soil layer,based on the actual project,the ultimate pullout bearing capacity of underreamed anchor cable and ordinary anchor cable is compared and analyzed through field pullout test,and the factors affecting the pullout resistance of underreamed anchor cable are studied,and the corresponding improvement measures are put forward,which provides theoretical basis and improvement ideas for similar projects.The results show that the ultimate uplift bearing capacity of the underreamed anchor cable can be increased by 20%to 40%compared with that of the ordinary anchor cable,and it has better applicability in soft soil strata.The proposed improvement measures can effectively control various factors of insufficient uplift resistance of the anchor cable in soft soil strata,and the ultimate uplift bearing capacity of the underreamed anchor cable can be increased by more than 40%.The engineering application data verifies that the underreamed anchor cable can effectively control the displacement of foundation pit and has good engineering application effect.

关 键 词：软土基坑 扩体锚索 抗拔试验 极限抗拔承载力 

分 类 号：TU753[建筑科学—建筑技术科学]