Calculation example of full cycle carbon emission of super deep foundation pit and carbon reduction measures

Abstract

The determination of carbon emission from foundation pit engineering is a tough and complex project owing to its characteristics including large material consumption, short use time, difficult recycling and no operation stage. To overcome these limitations, the calculation boundary and calculation method for carbon emission of foundation pit project are defined in this paper, which is successfully applied in the carbon emission analysis of the actual engineering project, i.e. the construction of large-scale foundation pit of Kunming comprehensive transportation international hub. All the carbon emissions coresponding to four working stages including building materials production, building materials transportation, construction and demolition were calculated and anatomized. The results revealed that the content of CO2 released in the stage of building materials production accounts for 89.3% of the total carbon emission, which means the amount of building materials consumed in the engineering project is the crucial factor to control the carbon emission. Besides, two kinds of carbon reduction measures, i.e. optimization design of support scheme and recycling waste materials of internal support demolition, were explored by analyzing the proportion and average value of carbon emission from different sub project of the support structure. A pronounced effect of carbon reduction was achieved. Furthermore, both a fast calculation method of carbon emission factor of unit work volume and general carbon reduction measures are proposed in this paper, which could provide a reference and new viewpoint for the engineers and designers to calculate and analyze the carbon emission and to take effective carbon reduction measures.