锚杆与土体相互作用的数值仿真计算  

Numerical Simulation of the Interaction between Anchor and Soil

作　　者：余巍伟[1] 施冬秀[1] 赖震宇[1] 

机构地区：[1]南昌大学科学技术学院,江西南昌330029

出　　处：《矿业研究与开发》2013年第4期100-104,共5页Mining Research and Development

基　　金：江西省科技计划项目(2011ZBBH8008)

摘　　要：采取Lagrange差分法,用双弹簧单元模拟锚杆单元,对锚杆拉拔工况下的应力变形特征进行数值仿真计算。在锚头处锚杆轴力最大,沿着锚杆体呈现出逐渐减小的趋势。由于锚杆的拉拔,在其与土体之间产生相对位移,引起界面上产生相互摩擦力。由于锚杆与岩土体的相互作用,在锚头和锚尾部周边土体形成应力集中区域。随着拉拔位移的增大,锚杆的锚固力也不断增大。土体周围的压力越大,相同锚头位移所需的拉拔荷载越大。随着锚杆长度的增大,锚固系统能够发挥的极限锚固力也增大,二者呈线性关系。沿着杆体长度方向,锚杆的锚固力呈现非线性减小。With Lagrange finite difference method and by using double spring unit to simulate anchor element, the numerical simulation calculation was done for the stress deformation char- acteristics of anchor in pull- out working state. The analysis showed that, at the anchor head bolt axial force was the largest and presented a gradually decreasing trend. Due to drawing, the relative displacement occurred in the interface of bolt and soil, which caused a mutual friction at the interface.Because of the in- teraction of anchor with geotechnical material, stress concentra- tion areas occurred in the soil around the anchor head and an- chor tail.With the drawing displacement increasing,boh anchor- age force also gradually increased. The higher the pressure of in surrounding soil was, the greater the drawing load was for the same displacement of bolt head. With the increase of anchor length, the limit anchoring force of anchorage system also un- ceasingly increased, and there was linear relationship between the two. Along the length direction of rod body, the anchoring force of bolt presented nonlinear reducing.

关 键 词：锚杆 锚固力 双弹簧单元 数值仿真 

分 类 号：TD350.1[矿业工程—矿井建设]