Study On Interacting Mechanism And The Load Transfer Regularity Of Rock Anchorage

Rock-mass anchorage is the very important branch of the geotechnical engineering. Meanwhile, research on working mechanism of rock-mass anchorage and law of load transfer of pre-stressed cables is one of the rock-mass anchorage cores. At present, although some achievements, it's still nor mature in theory of rock-mass anchorage working mechanism and load transfer mechanism because of complexity of engineering. It's a significant task in practice to make further study on the theory of load transfer mechanism to know the cables character well in order to provide theoretical principle of anchoring design.The main contents are as follows:Made research on the axial and tangential anchorage force's interacting mechanism of rock bolt, the theory analysis results is in good agreement with the in-field test results. The impact of anchorage force on mechanic character of anchorage masses and anchored effect of rock massed is analyzed.Based on the elastic theory, through established mechanic model of rock bolt in uniform rock masses on the base of the Boussinesg's solution of displacement, deduced the distributing expressions of the shear stress and axial force of bolt, the theory analysis results is in good agreement with the in-field test results. Also established the mechanic model of full-length bonded rock bolt in uniform rock masses, the distributing expressions of shear stress and axial force of rock bolt in pull test is derived. The theory analysis results are in good agreement with the in-field pull test results.Made research of load transfer regularity on the bonded section of pre-stressed cables, adopted the local deformation theory and the perfect elastic-plastic load-transfer model etc mechanic models deduced the shear stress and axial force distribution expressions on the interfaces of grout-rock masses and steel strands, analyzed the mechanic character and calculated the shear stress and axial force on the two interfaces as a specific example case; through analysis some impact parametric( E_r,P,R_m etc) obtained some significance conclusions.Generalized the interacting mechanism of pre-stressed cables, and discussed the reinforcement mechanism of pre-stressed cables in rock slope reinforcement. Made the technique and economy analysis on optimum anchorage angle of pre-stressed cables in rock slope reinforcement isβ= (45°)/(K+1)+(2(K+1))/(2(K+1))φ-α, the theoretical results is feasible in practical construction.