Analytical Predictive Models for Lead-Core and Elastomeric Bearing

Constitutive models aimed at predicting the mechanical response of lead-core bearing devices for passive seismic isolation are discussed in this paper. The study is focused on single-degree-of-freedom models which provide a relation between the shear displacement （shear strain） and the shear force （shear stress） in elastomeric and lad-core rubber bearings. Classical Bouc-Wen model along with a numerical procedure for identification of the model constants is described. Alternatively, a constitutive relation introducing a damage variable aimed at assessing the material degradation is also considered.

红山煤矿大断面软岩巷道支护技术探索与分析

本文主要对软岩巷道动态加固技术、施工工艺、联合支护、关键部位二次组合支护技术及其应用进行探索,对红山煤矿建设实现安全、快速、经济、优质,具有重要的现实和长远意义,同时对矿井下一步掘进施工及开拓延伸工程具有很好的指导作用。