Theory And Application Study On Stress-Transfer Mechanism Of Anchoring System

In this subject study of the theory and application of anchoring strength transmission mechanism in geo-technical enginaering, based upon intensive study of theoretical analysis, experimental simula:ion analysis, numerical analysis and in-situ observations analysis etc., series of significant research findings were gained in the essay, which are as follcws:1. Based upon the stress characteristic and rock-soil-anchorage body co-deformation theory, theoretic solutions tc stress distribution at anchorage zone of different type of prestressed anchor ropes such as wholly grouted anchor rod, type of pulling force concentrated and pulling force decentralized, pressure force concentrated and pressure force decentialized etc. were gained and their stress characteristics, stress distribution rules, influence factors and perspective range of application were discussed.2. The damage on the interface of anchorage body and rock-soil was proved main form of failure of anchorage system bated on the experimental research. Meanwhile, the magnitude of anchorage stress Wc.s found not only related to several well-known factors but intimately associated with the structural fabric of anchorage grouting materials and new methods for enhance anchoring strength were put forward. The stress characteristic of the interface, deformation rule under the action of load and the stress distribution rule were discussed by adopting the experimental research method. Consequent"y the mechanical behaviors on the anchorage interface were divided into three k nds: elastic, glide and debonding based on the mechanical effect of anchorage body.3. Anchorage body interface mechanics was originally put forward based on the experimental research, and mechanical model of glide feather of anchorage body was established with the use of Coulommb lonrelevant flow rule, further the corresponding constitutive relation was deduced, consequently theoretical solutions to various kinds of stress distribution rules on the interface were gained.4. Characteristic finite element analysis model of anchorage body interface mechanics was established based on experimental analysis of mechanical features of anchorage body, and a conclusion of compatibility was drawn from examination and certification by analytical calculations, theoretical research findings and experimental results. Meanwhile, the evolutionary rule of stress distribution of anchorage system with the increase of load was gained by adoption of finite element analysis technique.5. Data of vast scale were obtained through in-situ observations of static-load testing of pile, which was carried through the use of wholly grouted groups of bolts instead of the counter-forca piles. And the data gained from in-situ observations were proved accordant wi ;h those from theoretical analysis, from which the reliability of the research findings gained in this study was further certified.The anchorage theory in geo-technical engineering is the important constituent of the application and development of anchor technique, reliable theoretical basis for theoretical analysis, optimal design and calculation of anchorage theory is provided from the research finding obtained in this study.