基于能量原理的拉力型锚杆数值计算方法  

Numerical Calculation of Tension-type Anchor Based on Energy Principle

作　　者：樊昀 刘思思[2] 

机构地区：[1]湖南中智建筑有限公司,湖南长沙410129 [2]中南林业科技大学岩土工程研究所,湖南长沙410004

出　　处：《公路交通科技》2012年第12期14-20,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51108470);湖南省科技计划项目(2011TT2061)

摘　　要：基于能量原理,对拉力型锚杆锚固体的轴力与位移进行了计算分析。首先,对拉力型锚杆的承载机理以及所使用锚固单元和侧阻力计算模型做了简单介绍;其次,推导了锚固体单元的能量平衡方程,并给出其差分形式;然后,给出了拉力型锚杆锚固体工作性状的程序计算方法,并通过误差分析给出了程序收敛策略,提高程序计算效率;最后通过算例计算对拉力型锚杆锚固体承载性状进行了分析。研究表明:基于能量原理推导的拉力型锚杆锚固体能量差分方程及其程序计算方法可以合理地分析锚固体的工作性状,其计算结果可以为工程设计提供参考;拉力型锚杆锚固段的确定宜考虑锚孔直径以确定最经济的锚固长度。Based on energy principle, the axial force and the displacement of tension-type anchor were calculated. First, the load-bearing mechanism of tension-type and the computation model of anchoring unit and side resistance were introduced. Second, the energy balance equation of anchoring unit was derived, and its difference form was given. Third, the program calculation method of tension-type anchor working property was built, and the program convergence strategy was given based on error analysis to improve the calculation effectiveness of the program. At last, the bearing character of the anchorage body was analyzed through a calculation of example. The result shows that （ 1 ） the bearing character of anchorage body could be analyzed by the anchorage body energy difference formula of tension-type anchor and its program calculation method, which could provide a reference for engineering design; （2） anchor length of tension-type anchor should be determined by considering anchor hole diameter in order to obtain the economic anchor length.

关 键 词：道路工程 拉力型锚杆 能量原理 数值计算 荷载-位移曲线 极限锚固长度 

分 类 号：U417.116[交通运输工程—道路与铁道工程]