摘要
非预应力格构锚固是集坡面生态防护、浅表层与深层加固于一体的新型边坡加固技术,但目前无论就其加固力学机制,还是工程设计计算方法而言,学术界尚未达成共识。在分析边坡开挖失稳破坏力学过程与稳定性工况的基础上,依据应力扩散原理与Mohr-Coulomb强度理论,探讨了非预应力全长黏结格构锚固通过自主调动稳定区岩土体的力学强度来有效改善不稳定区边坡的受力状态和主动约束边坡不稳定变形持续发展的综合加固机制,包括双向挤密效应、锚拉效应、销钉效应、框箍效应与土拱效应;依照优化设计的基本原理与有关规范,构建了格构框架的优化设计数学模型与相关约束方程;利用Matlab7.0编写了该结构优化模型的自动寻优程序;通过在三峡库区某边坡治理工程中的应用,详细地介绍了其优化设计的计算过程;与基于工程类比法的原设计相比,可达到节省工程造价和优化设计结果的目的。
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 flame 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 flame 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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第7期2173-2178,共6页
Rock and Soil Mechanics
关键词
边坡治理
非预应力
格构锚固
机制
优化设计
slope treatment
non-prestressing
frame anchor
mechanism
optimization design
