煤矸石路基填料有害元素释放特性试验研究  

Study on Release Characteristics Tests of Harmful Elements in Coal Gangue Subgrade Filler

作　　者：张著芳 徐桂弘[2] 李振学 李佳林 邓怀文 任旭[2] ZHANG Zhufang;XU Guihong;LI Zhenxue;LI Jialin;DENG Huaiwen;REN Xu(Guizhou Highway Engineering Group Co.,Ltd.,Guiyang 550001,China;Guizhou Institute of Technology,Guiyang 550000,China;Cangzhou Road and Bridge Engineering Co.,Ltd.,Cangzhou 061000,Hebei,China)

机构地区：[1]贵州省公路工程集团有限公司,贵阳550001 [2]贵州理工学院,贵阳550000 [3]沧州路桥工程责任有限公司,河北沧州061000

出　　处：《路基工程》2023年第5期42-48,共7页Subgrade Engineering

基　　金：国家自然科学基金项目(地区基金):多雨地区无砟轨道结构裂纹处“冒白浆”及空蚀演化机理研究(51868009);贵州省科技计划项目:板式无砟轨道“填充层”裂纹辨识及损伤行为研究(黔科合基础-ZK[2022]重点027)。

摘　　要：通过对贵州省六盘水市大河煤矿、月照机场、小屯路三个位置堆积煤矸石浸出液进行采集分析,试验研究了密闭环境和开放环境条件下,煤矸石中Pb、Cd、As、Hg、Fe释放特性。结果表明:环境的密闭性和开放性对其浸出液中的有害元素释放特征及释放量有重要的影响,pH值、Pb、Cd、As等有害元素的释放,一般在密闭环境下较低,而在开放环境下释放量较大;煤矸石的堆积处理方式与周边环境关系对其金属元素的释放有重要的影响,煤矸石浸出液中部分有害元素随着时间的增长,其释放量逐渐增大(如:Hg)。因此,煤矸石作为路基填料填充利用时,需要首先对其进行分层灭菌处理,保持内部干燥状态,并进行隔绝外部环境的处理。Based on the collection and analysis of the leaching solution of coal gangue accumulated at three locations,namely,Dahe Coal Mine,Yuezhao Airport and Xiaotun Road in Liupanshui City,Guizhou province,the release characteristics of Pb,Cd,As,Hg and Fe of coal gangue in closed and open environments are experimentally studied.The results show that the tightness and openness of the environment have a significant impact on the release characteristics and amount of harmful elements in the leaching solution.The release values of harmful elements such as pH,Pb,Cd and As are generally lower in a closed environment,but higher in an open environment.The relationship between the deposit treatment of coal gangue and the surrounding environment has an important influence on the release of metal elements.With the increase of time,the release values of some harmful elements in the gangue leaching solution increases gradually(such as Hg).Hence,when the coal gangue is used as the subgrade filler in construction,it needs to be stratified sterilized,and keep dry and be isolated from the external environment.

关 键 词：煤矸石 密闭条件 开放环境 有害元素 释放特性 处理 

分 类 号：TU472.31[建筑科学—结构工程]