爆炸荷载作用下地下锚喷支护结构动力响应数值分析

Dynamic response numerical analysis of underground anchor shotcreting supporting structure under action of blast loading

为了研究常规钻地炸弹在岩石中爆炸时对地下支护结构的影响,应用LS-DYNA有限元程序分析了地下防护工程锚喷支护结构在爆炸荷载作用下的动力响应。模型中考虑了锚杆对岩石的锚固作用,其中混凝土采用H-J-C模型,并考虑了应变率效应。与国内外经验公式的计算结果比较表明,该分析模型与方法是合理的,能据此进行爆炸荷载作用下地下结构的动力可靠性分析。

For studying the influence on underground supporting structure of conventional penetrated bomb explosion in the rock.Dynamic responses of anchor shotcreting support structure of underground protective engineering were studied using LS-DYNA in the rock explosion.The reinforcement of bolt in the rock was taken into consideration in the FEM models.The H-J-C model is adopted for concrete,and the strain rate effect was also given due to consideration.By comparing with the results of the empirical relation,it showed that the proposed model and method are reasonable and can be used to dynamic reliability analysis on underground structure under action of blast loading