深基坑新型张拉嵌入复合排水型锚固结构支护特性数值仿真分析  

Numerical simulation analysis of the support characteristics of a new type of tension embedded composite drainage anchor structure for deep foundation pit

作　　者：袁方龙 陈运涛[1,2,3,4] 喻志发 王健[1,2,3] YUAN Fang-ong;CHEN Yun-tao;YU Zhi-fa;WANG Jian(CCCC Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300222,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China;Key Laboratory of Port Geotechnical Engineering of the Ministry of Communication,Tianjin 300222,China;Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]中交天津港湾工程研究院有限公司,天津300222 [2]中交第一航务工程局有限公司,天津300461 [3]港口岩土工程技术交通运输行业重点实验室,天津300222 [4]河北工业大学,天津300401

出　　处：《中国港湾建设》2024年第2期54-58,共5页China Harbour Engineering

基　　金：天津市科技计划项目(20JCJQJC00220)。

摘　　要：传统锚固结构很难满足软土地区深基坑工程工期紧、支护效果要求高的需求,对此提出张拉嵌入复合排水型锚固结构。通过分析新型支护结构的锚固机制得出:在基坑开挖过程中锚杆受力分为预张拉、端阻力递增和锚固作用失效3个阶段;给出了新型锚杆承载力计算方法;采用有限元软件模拟分析了新型结构的支护效果和排水特性。结果表明:新型锚杆轴力分布与普通锚杆不同,在预张拉锚头位置轴力出现陡增;相比于普通锚杆,新型锚固结构支护效果更好,能够使坡面最大水平位移减小37.2%,更有利于基坑稳定;新型锚固支护结构具有较好的排水效果,能够快速消散临空坡面附近的孔隙水压力。It is difficult for traditional anchoring structures to meet the tight construction period and high support effect requirements of deep foundation pit projects in soft soil areas,Therefore,a tensioning embedded composite drainage anchoring structure was proposed.By analyzing the anchoring mechanism of the new support structure,it can be concluded that the force acting on the anchor rod during the excavation process is divided into three stages:pre tensioning stage,increasing end resistance stage and anchoring failure stage;a method for calculating the bearing capacity of new anchor rods was provided;the support effect and drainage characteristics of the new structure were simulated and analyzed by using finite element software.The results show that:the axial force distribution of the new anchor rod is different from that of the ordinary anchor rod,and there is a sharp increase in axial force at the pre-tensioned anchor head position;compared to ordinary anchor,the new anchoring structure has better support effect,which can reduce the maximum horizontal displacement of the slope by 37.2%and is more conducive to the stability of the foundation pit;the new anchoring support structure has good drainage effect and can quickly dissipate the pore water pressure near the free slope surface.

关 键 词：深基坑 张拉嵌入复合排水型锚杆 锚固机制 承载力计算 支护效果 

分 类 号：U655.4[交通运输工程—港口、海岸及近海工程]