无粘结压力分散型锚杆的锁定荷载计算  

Locking force calculation of unbounded pressure-dispersive anchor

作　　者：张孟玫[1] 衡朝阳 周智[2,3] Zhang Mengmei;Heng Chaoyang;Zhou Zhi(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Institute of Foundation Enginnering,China Academy of Building Research Co.Ltd,Beijing 100013,China;CABR Foundation Enginnering Co.Ltd,Beijing 100013,China)

机构地区：[1]北京石油化工学院机械工程学院,北京102617 [2]中国建筑科学研究院有限公司地基基础研究所,北京100013 [3]建研地基基础工程有限责任公司,北京100013

出　　处：《建筑科学》2020年第7期26-32,共7页Building Science

基　　金：教育部产学研合作项目201702072091;中国建筑科学研究院应用技术课题20161602330730024。

摘　　要：无粘结压力分散型锚杆在建筑边坡与基坑支护工程中已得到采用,但由于其每个单元的杆体、自由段及锚固段差异较大,不可按照传统的拉力型锚杆统一加荷锁定。否则,在工程运行荷载作用下,不仅发挥不出锚杆各个单元共同协调承载的作用,而且随着锚杆受力增加,可能产生各个单元依次顺序损坏的工程安全隐患。本文从压力分散型锚杆的工作原理入手,建立了其力学模型,推导了数学表达式,提出了压力分散性锚杆各个单元锁定值仅需用单元长度代入的简单计算法,以及各单元按力控制的加荷技术及锁定方法,通过实际工程应用效果良好。The unbonded pressure-dispersive anchor has been used in the permanent slope support engineering.Because of the big difference of each unit’s rod body,free section and anchorage section,it can not be locked as same as the traditional tension anchor.Otherwise,not only it can’t play the role of the joint bearing of each unit of the anchor bolt under the action of the project operation load,but also the hidden danger of the project safety that each unit may be damaged step by step with the increase of the stress of the anchor bolt.In this paper,the mechanical model is established unbonded by pressure dispersive anchor,the mathematical expression is derived starting from the working principle of the pressure dispersive anchor,and the simple calculation methods are put forward that the unit locking value only needs to be known the length of the unit,as well as the loading locking method that each unit is controlled according to the force or deformation is proposed too.The application effect is good in one of the slope support engneering.

关 键 词：边坡支护 基坑 压力分散型锚杆 力学模型 锁定荷载 

分 类 号：TU443[建筑科学—岩土工程]