various uses
3.With the implementation of the energy mix readjustment plan in Beijing, the total coal consumption will be less than 15 million tons by 2008. According to the various uses and clean coal technologies and clean combustion technologies currently available, the following measures of efficient coal use are to be taken.
4.Chengdu Longquan Reixing Engineering Materials Plant Set product development, manufacturing and marketing its products and services into one, through the introduction, absorption, development and production of innovative self-drilling bolt grouting hollow products and exclusive ancillary machinery widely used in underground engineering (Traffic Tunnel, hydraulic tunnels, mine roadway Road and the various uses of Anchorage Support) geotechnical engineering (slope, dike rocks, the deep excavation Anchorage Support) repair Reinforcement Project (tunnels, dikes, dams, housing construction).
5.Strip-shape underground structures such as the tunnels and tubes for various uses can be treated as a beam on elastic foundation.Under earthquake condition,although there exists soil-structure interaction,the foundation soil vibration is dominant.In other words,analysis of earthquake response of the soil is essential.To this end,simplified models,(i.e.equivalent mass system models based on some equivalence criteria) are proposed,instead of a general 3-D continuum model.In this study,equivalence criteria are proposed and the simplified models are compared.The single-mass-string model is proved to be valid and therefore applied to the analysis of earthquake response of the Pearl River Immersed Tunnel.

