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Abstract There are fuzzy mechanical concepts，irrational methods of design and construction for anchored structures in ground in China. Which frequently lead to diseases and accidents，such as anchor failure，instability and even collapse of these structures. According to the geotechnical investigation of typical engineering and engineering accidents，theoretical analysis and experimental studies，some mechanical conceptual problems are studied which is significantly affected the stability and healthy development of ground anchorage engineering，in order to improve the construction level of ground anchorage engineering and provide a basis for improving ground anchoring engineering safety and economy，The main researches are as follows：(1) The prestressed anchor has the advantages of providing active resistance and transferring tensile stress of structures to the deep stable strata，which can be widely used to resist dumping，vertical displacement，shear failure along foundation base and openings collapse. (2) The anchor tendons section requirements of Adapting to tension stress control，enough anchor free length and anchoring formations fully mobilizing the ground shear strength of surrounding anchor roots are the basic elements for high tensile bearing capacity of anchors. (3) pressure- dispersive anchor significantly improves the load transfer mechanism and anti-corrosion protection performance and has excellent mechanical and chemical stabilities. (4) The timing lag of constructing anchors can be effectively controlled and avoided after excavation in the slopes and openings by timely applying tensile anchors and developing prefabricated reinforced concrete blocks as the high bearing capacity transfer structures. (5) In order to improve the stability of large openings in high stress and low-strength rock，It is necessary to adopt low prestressed anchors as initial support，strictly control the timing lag of constructing anchors，improve the initial prestressed value and strengthen the surrounding rock deformation—anchorage resistance(stiffness) interaction process control efforts.
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Received: 08 April 2014
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2015, Vol. 34 
