Three dimensional mechanical numerical analyzing on mine pass construction of metal mine
Mine use sublevel caving method, in the production process, the mine pass is an essential ore transport channel, in the production plays an very important role. Therefore the stability of the chute is an important technical support of the mining production and the safety in underground metal mines. Taking a sublevel caving method mining as the research background, Using the MIDAS / GTS finite element software to do numerical analysis of the chute excavation and support of three-dimensional mechanical problems. Results show that: After chute excavation, the wall within 0.3m of a significant displacement, shift several millimeters; different levels of access road excavation, the wall is affected little, But the access road junction with the chute significant displacement, especially with the chute increase the depth of wall the displacement increases; Slip road connecting the wells and different levels of support according to the design parameters, the effect of displacement control of the range of wall displacement and the interchange of access road and chute is significant.
Optimization research of stope structural parameters in sublevel caving with non-pillar
The common methods for optimizing structure parameters were analyzed and existing problems were also discussed.Then,optimizing mathematical model for approach spacing was set up by using the stochastic medium theory of drawing.Moreover,the calculation formula for drawing step was derived.To evaluate the total technique and economic effects for different stope structural parameters,the calculation formula of recovery rate and dilution rate to stope structural parameters was put forward.Lastly,the new method was compared with the traditional methods of determining stope structure parameters in a underground mine.The contrast results indicate that the new method match up to the reality.
Tourism in the Amazon: identifying challenges and finding solutions
Purpose – The purpose of this paper is to provide an overview of the tourism sector in the Amazon regions of Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Suriname and then discuss the manner in which tourism activity assists the protection of the Amazon rainforests. The paper also describes the manner in which the first World Hospitality and Tourism Themes Roundtable on Tourism in the Amazon is organized in 2009.Design/methodology/approach – Teams of researchers from the Ministries of Tourism, the private sector and academia in the Member Countries of Treaty for Amazon Cooperation collaborated to address, in ten‐page papers, the question “Does sustainable tourism offer solutions for the protection of the Amazon rainforest?”Findings – The paper provides valuable information on the current state of tourism policy and practice in the Amazon Member Countries. It also articulates the challenges that attend the development of sustainable tourism as a mechanism for the protection of the Amazon.Practical...