| Prestressed rock anchors have been used extensively in a wide range of geotechnical applications as temporary or permanent ground supports. Aimed at the requirement of high rock slope engineering design and dynamic loading conditions, numerical simulation methods and the dynamic bearing capacity of prestressed rock anchors are investigated systematically by numerical tests. A new method for simulating prestressed anchorage is proposed, and stability analysis of JinPing left abutment slope and the optimization of prestressed anchorage system are conducted by means of software FINAL. The dynamic bearing capacity under blasting load is also studied. The major results in this paper can be summed up in following:1,With a special contact interface element to simulate the slip surface and a proposed bolt element to simulate prestressed anchorage, stability analysis for an instability block located in JinPing left abutment slope is carried out. The influence of the discontinuity structures on the stability of the high rock slope and the stiffness and prestress contributions of the prestressed cables to the stress and displacement fields of the slope are fully considered. The results of the numerical analysis indicate that prestressed anchorage cables obviously improve the stability of the slope especially subjected to seismic loads and the anchor group effect is also discussed. The results obtained are of great significance to optimize the design of the prestressed anchorage works.2,The characteristic of dynamic bearing capacity of prestressed strand anchors subjected to blasting load is quantitatively evaluated. The key factors that influence the transient incremental tensile force along rock anchor are sequentially: the diatance from blasting area, the rock damping parameters, the explosive quantity, the prestress load. The results obtained are of significance to the rock slope excavation and construction of rock anchorage. |
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