Study On Prestressed Anchorage Technology Of Rock And Soil Under Complex Conditions

With the continuous development of China's economic construction,our country's infrastructure construction is in a period of vigorous development. Therefore,it results in a large number of high slopes,tunnels,deep excavation works and so on with complex environments. Because of the advantages of slight disturbance,fast construction,security and economy,prestressed anchor technology has been widely applied in geotechnical reinforcement engineering,and has made tremendous economic and social effects.According to the basic principles of damage theory, defined the rock's shear damage variable and grouts material's damage variable of anchorage section from the perspective of energy dissipation, and derived the corresponding damage evolution equation. On this basis, obtained the load transfer differential equation of anchoring section with considering of slurry material damage.Using load transfer method in anchorage section's force characteristics analysis, through the basic principle of load transfer method, derived the basic differential equation of load transfer of anchorage section. Combining the displacement solution of Kelvin problem, derived the anchorage section's load transfer function, studied the anchorage section's load-deformation characteristics of prestressed anchor, and studied the reasonable length of anchorage section.Truss structure system is a new type of structural system, Its self-protection, self-coordination has become the development direction of anchor supporting technology. By making numerical simulation of the self-protection devices that developed basing on this, obtained an ideal elastic-plastic load - displacement curve, which can play a significant role in improving the safety of truss structures applied in engineering.Studied the bolt's prestress loss mechanism in long-term loads from theoretical, analyzed the affecting factors of prestress loss, including: steel relaxation, rock rheology, construction factors and external environmental factors. On this basis, we propose some measures to reduce prestress loss, which has a certain significance for the bolt's design, construction and management.