岩体特性对围岩与结构动力相互作用影响

通过研究岩石特性,进一步对围岩与结构动力耦合机理进行分析。爆炸荷载原型实验研究困难较大,因此应用ANSYS/LS-DYNA非线性显式动力有限元程序和流固耦合计算方法,对垂直爆炸不同岩石类别、不同跨度地下拱形结构进行数值模拟,得到了岩石类别对于不同跨度结构影响的不同规律。研究表明:岩石硬度越大,拱顶动力相互作用显著增大,远距离爆炸对大跨硬岩结构拱肩和拱脚产生明显的反复拉压作用;岩石越软,跨度越小,近距离爆炸对整个结构动力相互作用影响越大。

The Influence of Rock Characteristics on Dynamic Interaction between Adjoining Rock and Structure Subjected to Blast Loading

The study of the dynamic interaction between adjoining rock and structure is important to decide the load of underground structure scientifically and to analyze the dynamic stability of adjoining rock.The rock characteristics are important factors. And it is difficult to study through prototype test because the blast loading is a destructive load. The nonlinear dynamic finite element procedure of ANSYS/LS-DYNA is applied and the fluid-solid coupling algorithm is selected to study with different spans and the detonating distances constantly changing. The result shows that the mechanics status of big-span is completely changed compared with that of the structure of small-span. And different laws of rock types for structures with different spans are obtained. The study shows that dynamic interaction is remarkable between large span structure and surrounding rock of remote explosion.