关键词: 边坡治理, 非预应力, 格构锚固, 机制, 优化设计

Abstract:

Non-prestressing frame anchor is a new slope prevention technology which sets surface ecological protection, shallow and deep reinforcement in one, but regardless of its reinforcing mechanism, or engineering design method, academia has not yet reached a consensus. On the basis of analysis of failure mechanism and stability operating during slope excavation, according to stress dispersion principle and Mohr-Coulomb strength theory, the reinforcing mechanism of non-prestressing frame anchor is discussed, including two-way compaction effect, anchor-pull effect, pin effect, skeleton-hoop effect and soil arching effect. These comprehensive effects can effectively improve the loading states of slope and actively constrain the deformation of slope in unsteady zone by initiatively transfering the mechanical strength of steady zone. According to the general principles of optimization design and relevant codes, the optimization design model of frame structure and associated constraint equations are constructed. The automatic optimizing programs of the model are compiled in Matlab7.0. The processes of optimization calculation are detailedly introduced by the practical application of a slope treatment project in the Three Gorges Area. The optimization design method can achieve savings in project cost and the purpose of optimization design results comparing with original design based on analogue method.

Key words: slope treatment, non-prestressing, frame anchor, mechanism, optimization design