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以系统工程思想方法为指导 ,遵循系统开发程序 ,仿照GIS可视化技术 ,使用VC+ + 6 .0编程技术 ,开发了土体人工边坡稳定性评价及辅助设计系统。将该系统及评价与设计融为一体 ,整个过程实现了计算机可视化。(1)在研究前人工作成果的基础上 ,选择非线性弹塑性有限元作为本系统的基本计算工具 ,按照系统开发的要求 ,对有限元软件进行了可视化修编。(2 )研究分析了目前边坡稳定性评价中存在的问题。在探讨了有限元直接评价边坡稳定性机理的基础上 ,实现了自适应弧长控制法的有限元直接评价技术。该方法以土体强度参数c,φ作为试探因数 ,通过逐步减小土体强度参数c,φ寻找土体破坏极限。当土体边坡破坏时 ,根据土体固有强度参数与破坏时的强度参数之比 ,求得边坡安全系数。而相应的位移增量等值线梯级带则反映了边坡潜在的滑动破坏面。重点讨论了自适应的弧长控制法、迭代收敛标准、破坏判别标志等技术问题 ,编制了相应的软件。(3)按照系统开发的程序和步骤 ,分系统分析和系统设计两个阶段 ,讨论了系统开发的有关技术问题。在分析边坡工程中 ,评价、设计、施工相互影响、相互制约等有关机理的基础上 ,研制了系统的逻辑模型 (数据流程图 )和物理模型 (系统结构图 )。(4 )应用GIS技术和VC+ + 6 .0编程技术 ,研?
Guided by the thought of system engineering method, following the system development program, imitating the GIS visualization technology and using VC + +6.0 programming technology, we developed the soil artificial slope stability evaluation and auxiliary design system. The system and evaluation and design integration, the entire process to achieve a computer visualization. (1) On the basis of researching predecessors’ work achievements, the nonlinear elasto-plastic finite element method is selected as the basic calculation tool of this system. According to the requirements of system development, the finite element software is visually revised. (2) Studied and analyzed the existing problems in slope stability evaluation. Based on the discussion of the finite element direct evaluation of the slope stability mechanism, the finite element direct evaluation technology of the adaptive arc length control method is realized. In this method, the soil strength parameters c and φ are used as the heuristic factor, and the destructive limit of the soil is found by gradually decreasing the soil strength parameters c and φ. When the soil slope is damaged, the slope safety factor is calculated according to the ratio of the strength parameters of the soil to the strength parameters of the failure. The corresponding displacement incremental contour cascade zone reflects the potential slip surface of the slope. Focus on the adaptive arc length control method, iterative convergence criteria, damage identification marks and other technical issues, the preparation of the corresponding software. (3) In accordance with the procedures and steps of system development, subsystem analysis and system design are two stages, and the related technical problems of system development are discussed. Based on the analysis of relevant mechanisms in slope engineering, such as evaluation, design, construction interaction and mutual restriction, the system logical model (data flow chart) and physical model (system structure diagram) are developed. (4) Application of GIS technology and VC + +6.0 programming technology, research?