工程开挖土的资源化再利用研究进展  

Research Progress of Resource Reutilization of Engineering Excavated Soil

作　　者：魏冠奇 王琰帅 洪舒贤 董必钦[1] 邢锋[1] WEI Guanqi;WANG Yanshuai;HONG Shuxian;DONG Biqin(XING Feng College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《材料导报》2022年第13期124-132,共9页Materials Reports

基　　金：国家自然科学基金(U1801254,51925805)。

摘　　要：近年来,现代化城市建设逐步向下延伸,如地铁、隧道及地下多层建筑等,以扩大城市空间并实现土地资源的高效利用。然而,在这个建设过程中会产生大量工程开挖土(Excavated soil,ES)。目前,ES的处理问题已成为我国城市管理的一大难题。与此同时,我国正处于基础设施的大量建设时期,势必会消耗大量自然资源。将ES作为原料替代部分不可再生资源,对于解决ES的产生和堆积量大、缓解地球资源紧张、保证可持续健康发展有重要意义。然而,ES的工程性较差,且其组成成分复杂多变,受地域因素的影响非常大,很难形成统一的生产规范。研究者们只能尽可能多地寻找合适的资源化再利用途径,同时尝试各种方法对ES进行处理,以提升其工程性。ES资源化再利用途径主要包括作为细骨料用于混凝土中、作为火山灰材料用于胶凝基体中、用于制备可控性低强度材料(CLSM)和煅烧制备建材产品。根据研究结果,通过对ES进行筛分、稳定化或改性处理,能够成功降低其塑性、显著提高其工程性;经低温煅烧后,ES具备火山灰活性,但其活性的高低主要取决于所含粘土矿物的种类和含量;以ES为原料制备CLSM最为简单,在国外早已得到了成功应用;通过添加合适的辅助材料,不同类型的ES均已被证实能够用于制备烧结砖或陶粒,但产品的档次主要取决于所用ES的质量。本文综述了近25年来有关ES资源化回收利用的研究。首先分析了ES的一般组成和特性,并指出了其工程性较差的原因;然后分类详述了目前主要存在的ES资源化再利用途径,同时总结了不同资源化再利用过程中所面临的问题和相应的解决办法;最后做出了综合性的评价并提出了一种合理的ES资源化再利用流程,以期为后续ES的研究提供参考。In recent years,to expand urban space and realize the efficient utilization of land resources,modern urban construction has gradually extended downward,such as subway,tunnels and underground multi-storey buildings.However,a large amount of engineering excavation soil(ES)has been generated during these construction processes.Nowadays,the treatment of ES has become a major problem in urban management.Meanwhile,China is in such a period,during which a large number of infrastructures need to be constructed,which is bound to consume a lot of natural resources.Therefore,it is quite significant for solving the current problems of large ES production and accumulation,alleviating the shortage of earth resources and ensuring sustainable development to partly replace the non-renewable resources with ES.However,the engineering performance of ES is poor.Moreover,it is hard to form a unified standard for ES utilization owing to its complex and highly locale-dependent composition.What a researcher can do is to find as many appropriate ways for ES reutilization as possible,while attempting various methods to deal with ES itself so as to improve its engineering performance.The ways for ES reutilization mainly include utilization as fine aggregate or pozzolanic material in concrete and cementitious matrix,respectively,the preparation of controlled low strength materials(CLSM),and the preparation of building material products with calcined ES.According to the research results,the plasticity of ES can be successfully reduced,and its engineering performance can be significantly improved by the means of sieving,stabilizing or modifying;the ES calcined at low temperature,has been proved to obtain certain pozzolanic activity,while the activity mainly depends on the types and contents of clay minerals contained in ES itself;in comparison,the most convenient way for ES reutilization is to prepare CLSM,and the ES-CLSM has been successfully applied abroad;all kinds of ES have been verified to be able to be utilized to prepare sintered brick

关 键 词：工程开挖土 回收利用 工程性能 细骨料 煅烧 火山灰活性 

分 类 号：TU526[建筑科学—建筑技术科学]