Environmental Impact Assessment Review ( IF 6.122 ) Pub Date : 2021-07-18 , DOI: 10.1016/j.eiar.2021.106644 Minghui Liu 1 , Siyi Jia 1 , Xueyan Wang 1
The excessive environmental impacts from the construction of subway infrastructure have become a concern for operators who are keen on continuing to lower the environmental footprint, but the factors affecting the impacts are yet to be fully identified. Excavation scheme is the governing factor in subway construction, not only because it prescribes the ensuing construction procedures, but it also epitomizes the design philosophy towards the interaction between the subway structure and city environment. In this paper, a comparative assessment is made among the fifteen mid-point environmental impacts from the two major excavation schemes in subway construction, i.e. the open-excavation (OE) and underground-excavation (UE) scheme. The case station provides a perfect example for such a comparison as it consists of both OE and UE section at the same buried depth. GHG emissions are identified as the largest contributor after normalization. However, GHG emissions are not representative for the overall impacts. The UE section is responsible for more impacts per area than that of OE section in all the investigated categories. The gap between the two sections is attributable to the extra reinforcement procedures that protect the surrounding infrastructure from adverse settlement. Though the underground environment limits the use of construction machines, the UE construction involves more on-site impacts because it requires 11.79 times the labor used in the OE section. Based on the results, the adaptability of the two methods was discussed, considering the life-cycle performance and their interaction with the city environment.
中文翻译:
地铁车站建设环境影响分析:明挖与地下开挖方案对比
地铁基础设施建设对环境的过度影响已成为热衷于持续降低环境足迹的运营商关注的问题,但影响影响的因素尚未完全确定。开挖方案是地铁施工的主导因素,不仅因为它规定了随后的施工程序,而且还体现了地铁结构与城市环境相互作用的设计理念。本文对地铁施工中两大开挖方案,即露天开挖(OE)和地下开挖(UE)方案的15个中点环境影响进行了比较评估。案例站为这种比较提供了一个完美的例子,因为它由相同埋藏深度的 OE 和 UE 部分组成。标准化后的温室气体排放被确定为最大的贡献者。然而,温室气体排放并不代表整体影响。在所有调查的类别中,UE 部分对每个区域的影响比 OE 部分要多。两个部分之间的差距归因于额外的加固程序,以保护周围的基础设施免受不利沉降。虽然地下环境限制了施工机械的使用,但UE施工涉及到更多的现场影响,因为它需要11.79倍的OE工段使用的劳动力。在此基础上,讨论了两种方法的适应性,