A construction strategy for a tunnel with big deformation

By integrating literature reviews, site observa- tion, field monitoring, theoretical analysis, summarization, etc., a construction strategy was proposed and verified for tunneling with big deformation in this paper. The tunnel was in phyllite, shotcrete cracks and steel arch distortion were observed, and a big deformation with a maximum of 2.0 m was monitored during the initial stage of the construction. Through carefully examining the site observation and laboratory test results, a construction principle was established for the tunneling on the basic concept of maintaining the rock strength/stiffness and keeping the rock dry, by providing confinement pressure to the rock, reducing the rock exposure time, keeping water out of the tunnel, etc. To achieve the construction principle, a set of specific construction measures with 11 items was further proposed and applied to the construction. To check the effectiveness of the construction measures, field monitoring was carried out, which showed that the rock deformation was well controlled and the tunnel became stable. An allowable deformation was then determined using the Fenner formulae and the monitored data in order to guide further construction, which received a good result. From this study, it can be concluded that providing quick strong initial support and reserving core soil at the working faceare extremely important to control the rock deformation and keep the tunnel stable.

Assessing high-quality development of the Guizhou industry under the big data strategy

Industry is the main industry of the real economy,the main body of scientific and technological innovation,and essential support for improving the quality and efficiency of the regional economy.In recent years,Guizhou’s industry has achieved efficiency,motivation,and change by relying on three strategic actions:big data,significant poverty alleviation,and big ecology,which has promoted the development of Guizhou’s s industrial economy.Guided by the ideas and concepts of high-quality development,this paper intends to construct the evaluation index system and evaluation model for the high-quality development of the industrial economy.This paper evaluates the high-quality development of the industrial economy in Guizhou Province from both vertical and horizontal aspects.Vertically,Guizhou in recent years in terms of big data,big ecology,and poverty alleviation strategy under the development trend is good;horizontally,among the four provinces and cities in southwestern China,Guizhou Province has the lowest average score in the past five years,and it is urgent to improve the talent policy and promote the upgrading of industrial structure.Finally,combined with relevant policies,countermeasures and suggestions are put forward for the shortboard of industrial development in Guizhou to promote the high-quality development of Guizhou’s industry.