废弃矿坑生态修复回填建筑垃圾与工程弃土混合料配比优化试验研究  

EXPERIMENTAL RESEARCH ON THE OPTIMUM RATIO OF CONSTRUCTION WASTE AND ENGINEERING WASTE FOR ECOLOGICAL RESTORATION OF ABANDONED MINE

作　　者：李佳宝 阎长虹[1] 俞良晨 郭书兰 王鹏斌 匡俊[3] LI Jiabao;YAN Changhong;YU Liangchen;GUO Shulan;WANG Pengbin;KUANG Jun(School of Earth Science and Engineering,Nanjing University,Nanjing 210023,China;Key Laboratory of Intelligent Underground Detection Technology,Anhui Jianzhu University,Hefei 230601,China;Jiangsu Suzhou Geological Engineering Survey Institute,Suzhou 215129,China)

机构地区：[1]南京大学地球科学与工程学院,南京210023 [2]安徽建筑大学智能地下探测技术重点实验室,合肥230601 [3]江苏苏州地质工程勘察院,苏州215129

出　　处：《工程地质学报》2025年第1期387-396,共10页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:42077232);江苏省地质工程环境智能监控工程研究中心开发基金项目(资助号:2021ZNJKJJ-11,2021ZNJKJJ-05);安徽省住房城乡建设科学技术计划项目(资助号:2022-YF017).

摘　　要：在城市建设及地下空间开发过程中产生大量的建筑垃圾与工程弃土,若以合理的配比混合料用于回填废弃矿坑,既可以有效解决废弃矿坑回填料不足的问题,又可以实现建筑垃圾固体废弃物的资源化利用,并解决堆放固体废弃物占用土地资源的问题,推进矿坑生态修复向节能减碳方向发展。但是,建筑垃圾与工程弃土成分复杂,需要合理配比才能保证填土边坡的稳定性及固体废弃物的利用率。本文依托苏州某矿坑回填土边坡,对建筑垃圾和工程弃土不同配比混合料开展室内试验研究,得到其混合料的相关物理力学性质指标。据此采用GeoStudio数值分析软件计算分析不同配比混合料回填土边坡稳定性。研究结果表明:随着建筑垃圾配比的增大,混合料的黏聚力呈现不断减小及内摩擦角呈现不断增大的趋势,混合料的抗剪强度与其配比呈指数函数关系;当配比为0.4的时候,不同工况下的边坡稳定性均良好,是矿坑回填边坡中工程弃土与建筑垃圾混合料的最优配比,在该配比下混合料的强度较大,且黏性土含量高,有利于矿坑后期的复绿工作。In the process of urban construction and underground development,a large amount of construction waste(CW)and engineering waste(EW)are generated.If a mixture of CW and EW can be used for backfilling the abandoned mine,it can not only effectively utilize CW,save land resources,but also promote the ecological restoration of the abandoned mine.The composition of CW is complex.In order to ensure the safety of the backfilling slope and to fully utilize CW,it is urgent to research the optimum ratio of CW and EW.Depending on the backfilling slope of the abandoned mine in Suzhou,laboratory research on the optimum ratio of CW and EW has been carried out,and then based on the results of laboratory research,GeoStudio is used to analyze the stability of the slope with different mixture proportions.The results show that the shear strength parameters of the mixture exhibit an exponential function relationship with the ratio of CW to EW.With the increase of the proportion of construction waste,the mixture’s cohesion decreases continuously,while its internal friction angle increases continuously.When the ratio of CW to EW is 0.4,the slope under different conditions is more stable.Therefore,0.4 is the optimum ratio of CW to EW for backfilling the abandoned mine.Under this ratio,the mixture has high strength and high clay content,which is conducive to the later greening of the mine pit.

关 键 词：建筑垃圾 混合料配比 废弃矿坑 直剪试验 稳定性 

分 类 号：P642.16[天文地球—工程地质学]