江西何魁核电站水文地质条件及渗透性特征研究

发布时间：2018-12-14 09:26

【摘要】：裂隙岩体渗透性基本特征是基岩水文地质学最重要的基础理论和应用技术。裂隙介质低渗透率研究是水文地质基础研究的难点问题。该研究为水资源及环境影响评价、核素迁移、地质灾害评价等问题提供可靠的依据和理论支持,对核电站的建设具有重要意义。以江西省峡江县何魁核电站为例,采用压水、抽水试验法测定厂区岩体渗透系数,采用综合分析法对厂区岩(土)体渗透性进行分析。研究了(1)江西省峡江县何魁核电站厂区水文地质条件;(2)何魁核电厂区岩体渗透性;主要结论如下:(1)厂区地下水补给来源为大气降水渗入补给,地下水面基本与地形相一致,测区坪状丘陵成为地形分水岭,也是本区地下水的天然分水岭,地下水向分水岭两侧溪流流入黄金江并最终汇入赣江。厂区属地下水水量贫乏,涌水量和渗透性受岩层风化和节理裂隙发育程度影响呈现均匀性。(2)第四系松散孔隙水渗透系数为2.0~1.0×10-2cm/s,为强透水,三叠系杏家单元(T3X)和水北单元(T3S)全风化渗透系数为2.01×10-3~2.89×10-3cm/s,属中透水,强风化岩体渗透系数为3.945×10-4~5.72×10-3cm/s,为中等透水,中等风化与微风化渗透率主要位于0.63~0.96Lu(渗透系数为7.00×10-6~1.17×10-5 cm/s),属微透水岩体,厂址区的岩体以微透水岩体为主。(3)压力随着岩层埋藏深度及上层覆盖岩石的增加而增大,使得相应岩芯的渗透率和孔隙度均呈现出不同程度的下降趋势。低渗透性岩石的岩芯孔道微细,使得上层岩石压力对岩芯渗透率的影响更为明显,孔隙体积的略微下降都将造成渗透率的急剧降低。(4)随着岩层深度的增加,风化程度减弱,岩层的渗透系数随埋深的增加出现一个减弱的趋势,岩石的透水率也随埋深的增加而呈现减小的趋势。
[Abstract]:The basic characteristics of permeability of fractured rock mass are the most important basic theory and applied technology in hydrogeology of bedrock. The study of low permeability of fractured media is a difficult problem in hydrogeological basic research. This study provides reliable basis and theoretical support for water resources and environmental impact assessment, nuclide migration, geological hazard assessment and so on. It is of great significance to the construction of nuclear power plants. Taking Hekui Nuclear Power Station in Xijiang County, Jiangxi Province as an example, the permeability coefficient of rock mass in the plant area is measured by water pressure and pumping test method, and the permeability of rock (soil) body in the plant area is analyzed by comprehensive analysis method. The hydrogeological conditions of Hekui Nuclear Power Plant area, Xijiang County, Jiangxi Province, and the permeability of rock mass in Hekui Nuclear Power Plant area, Jiangxi Province, are studied. The main conclusions are as follows: (1) the source of groundwater recharge in the factory area is precipitation infiltration and recharge, and the underground water surface is basically consistent with the topography. The flat hills in the survey area become the terrain watershed and the natural watershed for the groundwater in this area. Groundwater flows to both sides of the watershed into the Jinjiang River and eventually flows into the Ganjiang River. The water quantity of the plant is poor, and the water inflow and permeability are homogeneously affected by the weathering of the strata and the development of joints and fissures. (2) the permeability coefficient of the Quaternary loose pore water is 2.0 ~ 1.0 脳 10 ~ (-2) cm / s, which is strong water permeability. The total weathering permeability coefficients of Triassic Xingjia unit (T3X) and Shuibei unit (T3S) are 2.01 脳 10-3 (2.89 脳 10-3) cm / s, which belong to medium permeability. The permeability coefficient of strongly weathered rock body is 3.945 脳 10 ~ (-4) (5.72 脳 10 ~ (-3) cm / s), which is medium permeable. The medium weathering and breeze permeability are mainly located in 0.63~0.96Lu (permeability coefficient is 7.00 脳 10-6 ~ 1.17 脳 10 ~ (-5) cm/s) and belong to micro-permeable rock mass. The rock mass in the site is dominated by micropermeable rock mass. (3) the pressure increases with the increase of the buried depth of the strata and the overburden rock in the upper layer, which makes the permeability and porosity of the corresponding core decrease in varying degrees. The core pore channel of low permeability rock is fine, which makes the influence of upper rock pressure on core permeability more obvious, and the decrease of pore volume will result in a sharp decrease of permeability. (4) with the increase of rock depth, With the decrease of weathering degree, the permeability coefficient of rock layer decreases with the increase of buried depth, and the permeability of rock decreases with the increase of buried depth.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV221.2;TV223.4

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