基于期望造价的建筑场地填土边坡优化设计模型

Optimization design model of fill slope in construction site based on expected investment

建筑场地填土边坡的优化设计是边坡安全与风险评价的关键问题。根据场地工程特点,提出了以最小期望造价为目标函数的填土边坡优化设计模型,构建了模型的主要设计变量和约束条件;指出优化设计模型应与建设规划衔接、应考虑设计参数随机分布以及设计方案适用性。以广西平乐县二塘锰矿区建筑场地整平工程为例,通过优化设计模型的分析,得出了不同高度填土边坡的最优设计坡角和单位工程的最小期望造价,发现填土边坡的工程造价与设计坡高呈线性正相关关系,最优坡角与设计坡高之间为负指数相关关系。

Optimization design of fill slope is an important issue for the fill slope safety and risk assessment in construction site. Firstly, According to the characteristics of construction site engineering, this paper proposes a fill slope optimization design model based on the minimum expected cost as the objective function, and constructs the main design variables and constraints of this optimization design model. Secondly, this paper summarizes that during the previous survey process the design must contact with the construction plan, and must consider the random distribution of the design parameters and the applicability of the design. Finally, the optimization model is applied to a fill slope design of construction site engineering located in Ertang manganese mine, Pingle County, Guangxi. For the instance, the optimal fill slope angle of the different heights and the minimum expected unit cost are proposed. And, there is a positive linear correlation between the project cost and design slope height, while the optimal slope angle and the design slope height appear in a negative correlation for the fill slope in the Ertang manganese mine. The research provides a practical model for the optimization design of fill slope in construction site engineering, and has value for improving the risk assessment theory of fill slope.