Some researchers have been carried out on analysis of the influence of the full grouted prestressed anchor shape of borehole wall on its carrying capacity. Based on the self-affine fractal feature of anchor borehole wall structural plane, the relation equation among structural plane shear strength, liquid injection pressure, tensile load and structural plane fractal dimension D was built, the instability judgment criterion of anchoring bearing strata and rock structural plane was determined, the solving equations of disintegrated rock support density were derived. Based on the experimental results, the theoretical basis of support design under the disintegrated rock condition was offered.

In the process of civil aircraft production, there will exist such a situation that the fasteners interfere with bend radius and it is hard to replace the structure element because of some limits of objective condition. This article investigates the fatigue quality of structure under tensile load with unloaded fasteners which rivet bucktail overrides bend radius (parallel to load) in civil aircraft by fatigue tests based on DFR method. The results show that the DFR value will not decrease if the fastener interferes with bend radius is not as serious as the situation that the No.6 rivet hole of the structure under tensile load with R5 invases bend radius 1.0mm.