锚杆拉拔试验的理论和数值分析

英文篇名：Theoretical and numerical analysis of bolt pull-out test
中文刊名：岩土力学
英文刊名：Rock and Soil Mechanics
作者：贺若兰 ; 张平 ; 刘宝琛
英文作者：HE Ruo-lan~(1 ; 2) ; ZHANG Ping~3 ; LIU Bao-chen~2 (1.School of Bridge and Structure Engineering ; Changsha University of Science and Technology ; Changsha 410076 ; China ; 2.School of Civil and Architectural Engineering ; Central South University ; Changsha 410075 ; China ; 3.College of Civil Engineering ; Hunan University ; Changsha 410082 ; China)
中文关键词：锚杆 ; 拉拔试验 ; 界面黏结强度 ; 理论模型 ; 数值分析
英文关键词：bolt ; pull-out test ; intertace cohesion strength ; theoretical model ; numerical analysis
出版日期：2006-10-20
机构：长沙理工大学桥结学院;中南大学土建学院;湖南大学土木工程学院;
年：2006
期：S2
出版单位：岩土力学

摘要

详细分析了现场锚杆拉拔试验的实测数据,说明了传统设计中认为界面抗剪应力平均分布的简化假定与近似服从负指数分布的实测结果存在误差。考虑界面黏结强度中化学胶着力、机械咬合力和界面摩擦力逐渐丧失的过程,建立了一个可以通过现场拉拔试验得到的极限荷载反算出界面抗剪强度和解耦长度的理论模型。引入一种可以模拟锚杆与岩上界面复杂力学特性的摩擦.接触型界面单元建立数值模型进行仿真分析,再现了现场试验全过程的力学响应。通过与实测数据对比分析,验证了理论模型和数值分析的可靠性和精度。
Based on the pull-out test on bolts in-situ,the test data are analyzed and the difference of shear stress distribution along the bolt is discovered between the usual simplified assumption and the actual condition.In usual analysis,the shear stress along the bolt is assumed even distribution,but the real result is negative exponential distribution under pull-out condition.Considering the working mechanism and damage process of cohesion strength,a theoretical model for the pull-out bolt is rebuilt.In this model,the interface shear strength and uncoupling length parameter can be easily deduced from the ultimate load measured from pull-out test. Furthermore,a numerical model including a friction-contact interface element which can simulate the complex mechanical properties of the interface is introduced;and the mechanical response of bolt under pull-out load is analyzed.Comparing the calculation result with the field test,the reliability and precision of the theoretical model and numerical analysis are verified.

引文

[1] 陈肇元,崔京浩.土钉支护在基坑工程中的应用[M].北京:中国建筑工业出版社,1997． 49-52．
    [2] 程良奎.岩土加固实用技术[M].北京:地震出版社,1994．
    [3] GB 50330-2002,建筑边坡工程技术规范[S].
    [4] GB 50086-2001,锚杆喷射混凝土支护技术舰范[S].
    [5] CECS 96:97,基坑土钉支护技术规程[S].
    [6] Kaiser P K.Effect of the stress change on the bond strength of fully grouted cables[J[.International Journal of Rock Mechanics and Mining Sciences & Geomechanical Abstracts,1992,29(3) :293-306．
    [7] Indraratna B,Kaiser P K.Analytical model for the design of ground rock bolts[J].International Journal for Numerical and Analytical Method in Geomechanics,1990,14:227-251．
    [8] 尤春安.全长黏结式锚杆的受力分析[J].岩石力学与工程学报,2000,19(3) :339-341． YOU Chun-an.Mechanical analysis of wholly grouted anchor[J].Chinese Journal of Rock Mechanics and Technology,2000,19(3) :339-341．
    [9] 朱焕春,荣冠,肖明,等.张拉荷载下全长粘结锚杆工作机理试验研究[J].岩石力学与工程学报,2002． 21(3) :379-384． ZHU Huan-chun,RONG Guan,XIAO Ming,et al.Testing study on working mechanism of full grouting bolt under tensile load[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(3) :379-384．
    [10] Farmer I W.Stress distribution along a resin grouted rock anchor[J].Internation Journal of Rock Mechanics and Mining Science & Geomechanics Abstracts.1975,12:347-351．
    [11] Li C,Stillborg B.Analytical models for rock bolts[J].International Journal of Rock Mechanics and MiningScience,1999,36:1 013-1 029．
    [12] 雷晓燕,Swoboda G,杜庆华.接触摩擦单元的理论及其应用[J].岩土工程学报,1994,16(3) :23-32． LEI Xiao-yan,Swoboda G,Du Qing-hua.Theory and application of contact-friction element mode[J].Chinese Journal of Geotechnical Engineering,1994,16(3) :23-32．
    [13] Swoboda G Program System FINAL-Finite Element Analysis Program for Linear and Nonlinear Structures[M](Version 7． 1) .Innsbruck:Publisher of Innsbruck University,2001．