Environmental Benefit Analysis Of Deep Foundation Pit Supporting Engineering Based On LCA And LCC

The sustainable development of civil engineering has become a consensus around the world.As a result of the promotion of the national urbanization construction policy,the numbers of high-rise buildings and underground spaces increase rapidly,which lead to the development of deep foundation pit projects.In order to achieve the sustainability of urban building development,how to quantify and assess the resource consumption,pollutant discharges and environmental impacts of construction projects has become a research hotspot.As an important link in the deep foundation pit project,the deep foundation pit support engineering’s cost and sustainability must be considered.Based on a large number of engineering practices,although the support engineering has made great progress in technology,the research on the environmental benefits of deep foundation pit support engineering is still insufficient.Life cycle assessment(LCA)and life cycle cost(LCC)have been applied in construction engineering to quantify environmental impact assessment and environmental cost.The purpose of this paper is to use LCA and LCC to establish the life cycle environmental impact assessment model,environmental cost calculation model and life cycle environmental benefit assessment method of deep foundation pit support engineering,which will provide theoretical support for scheme selection and project design,thereby further improving the construction project life cycle management system.The main research content of this article includes the following aspects:(1)Determine the purpose and scope of the life cycle assessment(LCA)of the foundation pit support project.Three endpoints are selected based on the ecological indicator method(Eco-indicator 99): ecosystem,human health and resources and energy.Establish quantitative calculation and analysis models of end-point environmental impact of foundation pit support engineering.(2)Analyze the composition of life cycle cost(LCC)of foundation pit support engineering and the cost of materials,electricity,energy and other consumption in the foundation pit support engineering,propose a calculation model for the total life cycle pollutants discharges,as the basis for the calculation of external environmental cost.(3)Calculate and analyze the environmental costs of the material production,and construction stages of the foundation pit support project,and propose a life cycle environmental cost calculation model for the foundation pit support project based on LCC.(4)Combined with a case of a deep foundation pit support project in foshan city,the life cycle assessment and quantitative professional software GaBi were used to carry out life cycle assessment based on end point quantization model ReCipe1.08 and the calculation and analysis of life cycle environmental cost.