| Coal is an important energy source in China,but the mining of coal will produce mining subsidence area.The construction of photovoltaic power stations on the mining subsidence area can fully utilize land resources,save energy and reduce consumption,and respond to the demand of national policies,both economic and social benefits.This paper takes Anhui Qinan coal mine as the research area,combined with the basic requirements of the photovoltaic power generation,based on the present situation of subsidence and subsidence prediction in the study area,the impact of underground mining on the construction site,and the stability of the construction site and water quality analysis to determine the mining subsidence area in the study area.It is possible to build photovoltaic power stations according to needs and actual situation.The main findings are as follows:(1)Collecting mine production geological report and Qinan coal mine to long-term exploration and development,and conforms to the subsidence regularity in the study area,based on analysis of characteristics of the subsidence in the study area,it shows the present situation of mining subsidence mainly concentrated in the north,central and west,the largest settlement is about 5.8 meters.(2)Through the analysis of the data,it is found that the subsequent subsidence is mainly concentrated in the west,central and north,with a maximum subsidence of about 5.8m.After the final subsidence prediction of the study area,it shows that the subsidence area expanded,mainly distributed in the west,central,north,south and southeast,with the maximum subsidence of about 8.6 meters.From the current subsidence to the final settlement,the settlement amount of 0~2 meters will mainly change,and the settlement near the boundary of mining right is relatively stable.(3)According to the empirical prediction method,the minimum mining depth of Qinan coal mine is 311.5m,the height of water-conducting fracture zone is calculated according to the average value of the adjacent mining area of 50 m,and the influence depth of building load is calculated according to the influence depth of general building load of 22 m.It shows that the minimum mining depth is bigger than coal mine water flowing fractured zone height and construction load impact depth,the sum of both new building,the construction load of things won't destroy the stability ofmined-out area,the surface won't happen again bigger uneven subsidence,underground mining won't destroy the surface buildings and underground water flowing fractured zone,will not affect the surface building photovoltaic power station.(4)Through geotechnical engineering investigation and hydrogeological condition analysis,it shows that there are two engineering geological layers in the study area,namely,the mixed fill layer and the silty clay layer.The first layer has low soil strength and great thickness variation.The second layer of general strength,medium compressibility,can be used as a natural foundation;The corrosion of underground water to steel structure building materials is small.The seismic fortification intensity of the site is 6,which is the general seismic section;The resistivity uniformity of the first layer is poor,and that of the second layer is good.At the same time,there is no adverse geological effect and the foundation is stable,which can be considered as the site selection of photovoltaic power generation.(5)Through the water quality testing in Houwangzhuang area on the west side of the study area,it shows that the average surface water salinity of the area is level 2.The average total hardness is grade 3.Hydrochemistry type ?;Natural water quality indicators are not exceeded,with good water quality.Surface water is only slightly corrosive to the concrete structure under different environmental types and different stratum permeability conditions.Under long-term immersion and alternating wet and dry conditions,it is only slightly corrosive to the steel bars in the reinforced concrete structure.Different types of photovoltaic power stations can be built according to the site water depth.Figure 25 Table 26 Reference 89... |
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