井田内奥灰岩上部岩层隔水能力的研究

Study on water resisting ability of upper strata of Ordovician limestone in mine field

本文主要对井田内奥灰岩上部岩层隔水能力进行系统研究,认为本溪组和下伏奥陶系地层的假整合界面下部具有一定厚度的奥陶系碳酸盐岩层为奥灰岩上部的相对隔水层,该岩层的整体强度较高,渗透性极低;峰峰组灰岩的岩溶形态有溶孔以及溶蚀裂隙等,溶蚀裂隙的充填物主要为泥质和方解石,而溶孔分布较广,但孔径较小,充填物较少;峰峰组上部岩体的孔隙度较小,渗透率较低,对奥灰水的阻隔能力较高;峰峰组上部的化学环境为还原条件,在该条件下灰岩所含的钙质成分少,岩溶作用进行的难度较大;隔水层的承压水头为11.39MPa。

In this paper,the water isolation ability of the upper strata of the Ida internal ordovite is systematically studied.It is believed that the Ordovician carbonate rocks in the lower part of the Benxi formation and the lower Ordovician strata with a certain thickness are the relative aquifers on the upper part of the ordovite,and the overall strength of the strata is high and the permeability is very low.The karst morphology of Fengfeng Group limestone consists of dissolved pores and dissolution fractures.The filling materials of the karst fissure are mainly mud and calcite,but the pore size is small,and the filling is less.The porosity of the upper rock mass is small,the permeability is low,and the ability to obstruct the oroaceous water is high,and the chemistry of the upper part of the peak peak group is chemical.The environment is a reduction condition.Under this condition,limestone contains less calcareous elements,and the karstification is more difficult.The confined water head of the aquifer is 11.39MPa.