珙县某危险废物填埋场水文地质特征研究

Study on Hydrogeological Characteristics of a Hazardous Waste Landfill in Gong County

本文根据在珙县某危险废物填埋场开展的野外调查工作和试坑入渗试验,结合前人在区内进行的水文地质普查成果,划分了研究区的含水层岩组与地下水类型,阐述了不同类型地下水的补给、径流和排泄等水文地质特征,并结合入渗试验测的渗透系数对包气带防污性能进行了初步评价,结果可知:研究区地下水类型可划分为碎屑岩类孔隙-裂隙水和松散岩类孔隙水两类,主要来源是大气降水补给,地下水动态随降雨变化明显,水量一般较少至中等,红层承压水在静水压力作用下向深部运动,通过机井揭露排泄,水量较丰富;利用双环试坑渗水试验可知,场址区粉质粘土层的渗透系数为0.011～0.013 m/d,渗透性等级为弱透水,防污能力较好。

Based on the field investigation work and test infiltration test results of a hazardous waste landfill in Gong xian County,combined with the results of hydrogeological survey conducted by the predecessors in the area,the aquifer group and groundwater in the study area are divided.Type,expounding the hydrogeological characteristics of different types of groundwater recharge,runoff and excretion,and combining the permeability coefficient measured by infiltration test to preliminarily evaluate the antifouling performance of the vadose zone.The results show that the groundwater type in the study area can be divided into There are two types of shale-like pores-fractured water and loose rock-like pore water.The main source is atmospheric precipitation recharge.The groundwater dynamics change obviously with rainfall.The water volume is generally small to medium.The red layer confined water moves deep under hydrostatic pressure.Through the machine well to expose the excretion,the amount of water is abundant;using the double-ring test pit water seepage test,the permeability coefficient of the silty clay layer in the site area is 0.011 ~ 0.013 m/d,the permeability grade is weakly permeable,and the antifouling ability is better.