The Study On Dynamic Parameters Using Back-analysis In The Archor Bar & Surrounding Rock Structure System

The low strain dynamic coefficient in the area of Bolt—Surrounding rock structure system can reflect synthetically the material performance, inside structure system and the jointing capabilities between the materials, it is the important index of weighing the firm quality of systematic anchor of stocks. Based onthe longitudinal dynamical response of an integrate anchor with small strain in Bolt—Surrounding rock structure system, the major component of this text is to do the back analysis for the dynamical coefficient. Under the support of such projects as " Bolt—Surrounding rock structure system the non-harm flaw detection theory and intelligence diagnose the method (National Natural Science Fund is 50378096) "and " rock soil anchor firm system intelligence of quality measure and diagnose " (Ministry of Education science and technology research key project 0318), this text is aimed at the research on Bolt—Surrounding rock structure system carry on low strain dynamic coefficient, work are as follows. 1. Set up a mathematical-mechanical model that the longitudinal dynamical response of an integrate anchor with small strain, put forward this analytical method and semi-analytical method, settle corresponding foundation for dynamics theory of anchor system. Set up defect stock mathematical-mechanical model, vibration of issue, study semi-analytical method, offers the theoretical foundation for discernment of the defect of the rock bolt, measuring of the firm quality of anchor. 2. Analyse and research on the method and limitation the traditional rock bolt. Confirm the fetching value range of the parameter on the basis of drawing lessons from the theory of pile longitudinal dynamical response, research results of a base, set objectives function. Utilize the hereditary algorithm toolbox of "MATLAB"--GAOT (free software) carries on the parameter to perform and design instead. Set up stocks --Calculation model that the structure systematic motive force parameter of the system performs instead. 3. Prove the feasibility and accuracy of the method back-analysis. (1) Carry on the parameter based on theory curve to perform instead, and back-analysis and compare the parameter of performing instead, prove that performs the feasibility and accuracy of the method instead. (2) Carry on indoor model simulation experiment, through experimental result with perform comparison verification of result of analysis on feasibility and accuracy of method instead.