| The mining environment is worsening along with the increase of the mining depth, the problem caused by the deep high temperature and the high humidity geothermal gradually highlight can lead to the deterioration of the working environment and restrict the mine exploitation to the deeper development and can also seriously threat the underground construction and the personnel state of body, whicg can increase the safety of mining. So it is imperative to control and govern the thermal damage of the deep mine, of which the study of the high thermal pollution area is particularly important. The cuase of the deep thermal damage and the evaluation and government of the high thermal pollution area are studied based on the engineering background of the Chenzhou Woxi mine. In this paper, the main contents and results are as follows:1. Combined with the research of the cause of the downhole high temperature heat source, in view of the underground mine environment, several major heat source of deep mine which comibes the heat transfer of the surrounding rock, the heat release of the air compression, the heat relesas of the hot water, the heat relesase of the transport details and the heat release of the explosion, the influence and threat of the thermal damage of the deep mine to the workers is also analyzed,which prodives a condition to evaluate the high heat damage area of deep mine.2. The original rock temperature of the WoXi pithead heap-leaching is investigated using the shallow hole thermometry. The pithead geothermal gradient of the WoXi pithead is obtained based on the linear regression analysis of the survey data., The high geothermal gradient of the WoXi pithead which has a seriously heat damage of deep mine is found by analogy to the other domestic mining geothermal gradien. The establishment of geothermal detection system is constructed in the10selected representative poin which provides the data source to establish the mine human body comfort level fuzzy mathematical evaluation model.3. In view of the complexity of the deep heat source, according to the systematic principle, the principle of typicality, concise scientific principle, operational and quantifiable principle, comprehensive principle, the evaluation system of the high thermal damage area in deep mine can be divided into the target layer and index layer and rule layer, and select nine main factors from the subjective perspective of the underground staff such as the mine temperature as the evaluation index.4. Comprehensive evaluation mathematical model of the high thermal damage area of deep mine is established on the basis of the improved analytic hierarchy process (AHP) and fuzzy mathematics, the AHP judgment matrix is improved to determine the evaluation index weight as well. Moreover, the standardized indicators is introduced to fuzzy mathematical model, which can compare the pros and cons of each program and verify the feasibility of the programs by calculating. In this paper, the method is applied to the assessment of the high thermal damage area mine in Chenzhou Woxi deep mine, comprehensively evaluates three different middle segment and draws the judge vector (0.862,0.777,0.633,0.831). The results show that with the deepening of the mine middle segment, the thermal damage degree decreased significantly, only16th middle segment level is slightly higher than the standard value, deep42nd middle segment doesn’t meet the standard. This is the same as the actual situation of the construction site, which shows that the method is scientific and reasonable, and it can be extended in engineering applications.5. The control scheme such as the ventilation system transformation and a variety of thermal cooling measures is putted forward in view of the existing thermal damage area of the middle, which can provide a very important reference in more effective governance of the future pithead heap-leaching of WoXi geothermal disasters. |
