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为一个1000×500(米)地区沙子的开采进行工程设计和评估.根据该地区20×10个网点处有关数据,估算该地区的沙的储量是210万吨.在每月10万吨的开挖量的限制条件和考虑1%的月贴现率下,引入开采每吨沙土所获利润函数,确定开采沙子的施工原则是实现该函数由大到小.然后照顾施工方便设计每月具体工程方案,计算出整个工程需投资2364.6万元,工期30个月.可采沙195.54万吨,获利润近1500万元,利润率在60%以上.
Engineering and evaluation of the mining of sand in a 1000 x 500 m area Based on data from 20 x 10 outlets in the area it is estimated that the sand reserves in the area are 2.1 million tonnes at a monthly rate of 100,000 tonnes Digging the constraints and consider the monthly discount rate of 1%, the introduction of mining per tonne of sand obtained by the profit function to determine the mining principle of sand is to achieve the function of descending.Then take care of the construction of a convenient monthly design of concrete projects , Calculated that the entire project need to invest 23,646,000 yuan, the project period of 30 months .1995,400 tons of sand can be collected, a profit of nearly 15 million yuan, the profit margin of 60% or more.