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一、概述季节冻土区和多年冻土区砂金矿床,往往因冻结增大了土的抗切削强度,给砂金矿的开采带来了很大的困难,随着冬季来临早及自然解冻慢,使挖掘开采期大大缩短。为了提高冻结砂金矿的开采效率和延长开采期,核心问题就是要解决冻土层的解冻问题,减少其抗切削强度。解冻技术是通过人为地升高冻土层内的温度,达到冻土体融化的目的。目前常用的方法有:1.逐层剥离法用地表和大气间的自然热质交换条件,逐层融化剥离,从而加速冻土层的融化。2.水针解冻法该方法利用水力针注入冷水或热水,升高冻土层内的温度,使冻土体提前融
First, an overview of the seasonal permafrost and permafrost placer deposits, often due to freeze to increase the soil resistance to cutting strength, gold and gold mining to bring great difficulties, with the onset of winter and natural slow thawing slow , So that mining and mining period greatly reduced. In order to improve the mining efficiency of frosted gold and gold and prolong the mining period, the key problem is to solve the problem of thawing in frozen soil layer and reduce its anti-cutting strength. Thawing technology is to artificially increase the temperature within the frozen soil, frozen soil to achieve the purpose. At present, the commonly used methods are as follows: 1. The layer-by-layer stripping method uses the natural heat and mass exchange conditions between the earth’s surface and the atmosphere to melt and peel off layer by layer, thereby accelerating the thawing of the permafrost layer. 2. Water Needle Thaw Method This method uses a hydraulic needle into the cold water or hot water, raising the temperature in the frozen soil layer, so that the frozen soil ahead of the melt