巷道临时支护棚架接顶性能的多目标优化设计

Multi-objective Optimization Design of Roof Joint Performance of Temporary Support Scaffolding in Roadway

针对当前临时支护设计普遍存在的不重视围岩与支护相互作用及未充分考虑材料刚性接顶造成应力集中引起局部支护强度过大而容易对顶板造成损害的问题,提出了柔性接顶临时支护棚架的设计方法。在分析顶板垮落形成自然平衡拱的基础上,结合普氏理论计算压载分布特性,确定了考虑初撑力和工作阻力的最优支护强度分布的目标函数。利用参数化建模方法完成了临时支护棚架接顶机构模型的三维建模,并建立了计算有限元模型,采用均匀拉丁超立方抽样方法选取试验设计样本点,利用NSGA-Ⅱ遗传优化算法,对支护性能进行了多目标优化设计,并根据得到的Pareto前沿分布对结果进行优化。有限元分析表明,巷道临时支护棚架接顶性能的多目标优化设计显著提升了临时支护棚架的支护性能,可以应用在对临时支护设备的工程设计中,对解决当前广泛面临的采掘失衡问题和推动掘进工作面自动化、智能化具有重要意义.

In view of the common problems in current temporary support design,such as not paying attention to the interaction between surrounding rock and support and not fully considering the stress concentration caused by rigid roof joint of materials,the local support strength is too large and easy to cause damage to the roof,the design method of flexible roof joint temporary support equipment was proposed.On the basis of analyzing the natural balanced arch formed by roof caving,the objective function of optimal support strength distribution considering initial supporting force and working resistance was determined by calculating the characteristics of ballast distribution based on Protodyakonov′s theory.The parametric modeling method was used to complete the three-dimensional modeling of the temporary support roof mechanism,and the finite element model was established.The uniform Latin hypercube sampling method was used to select the test design sample points.Using NSGA-Ⅱgenetic optimization algorithm,the multi-objective optimization design of supporting performance was carried out,and the results were optimized according to the obtained Pareto front distribution.The finite element analysis shows that the multi-objective optimization design of the roof joint performance of temporary roadway support scaffolding significantly improves the supporting performance of temporary support scaffolding,and can be applied in the engineering design of temporary support equipment,which is of great significance to solve the widely faced problem of mining imbalance and promote the automation and intellectualization of heading face.