Method for converting full-life-cycle carbon emission of subway engineering muck

Abstract

The invention discloses a method for converting full life cycle carbon emission of subway engineering muck, which relates to the technical field of carbon emission calculation and comprises the following steps of: firstly, dividing the full life cycle of the subway engineering muck into a generation stage, an on-site recycling stage, a transportation stage and a disposal stage; then, according to the size data of the subway station and the tunnel, the output of subway engineering muck is calculated; calculating the carbon emission of each link of the engineering residue soil in combination with the data information of construction equipment and vehicles and the carbon emission factor parameters; the sum of the carbon emissions of all the stages is the carbon emission of the subway engineering muck in the whole life cycle. The accurate and practical method for converting the carbon emission of the subway engineering muck in the whole life cycle is provided for solving the problem that a carbon emission converting mechanism of the subway engineering muck is not clear yet, the technical blank is filled up, and meanwhile it is verified that the method has reference value for low-carbon development of the industry.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission calculation, and in particular to a method for quantifying carbon emissions of subway engineering slag over its entire life cycle. Background Art

[0002] Since the "dual carbon" strategy was proposed, all industries have been moving towards low-carbon development. The carbon emissions of the construction industry account for half of the country's total carbon emissions. It can be seen that energy conservation and emission reduction in the construction industry are imminent. Mastering accurate carbon emission data is very important for guiding the industry's carbon reduction work. At the same time, people in this industry have also been exploring the carbon trading market in recent years. Actual and accurate carbon emission data is also particularly important for market operations and fair regulations. Therefore, it is very necessary to invent a reliable, credible and scientific carbon emission quantification method.

[0003] At present, for carbon emission quantification models, the current research mainly considers the main body of the building. The carbon emission quantification methods for each stage of the building and even the entire life cycle are relatively mature, but the carbon emission quantification methods for infrastructure are not yet mature and perfect. At the same time, the method for quantifying carbon emissions from subway slag is not detailed enough and still only remains at the level of rough estimation. Therefore, it is necessary to provide a more complete method to solve the problems existing in the existing technology. Summary of the invention

[0004] The purpose of the present invention is to provide a method for quantifying carbon emissions of subway engineering waste over its entire life cycle, so as to solve the problems in the prior art of unclear carbon emission quantification mechanism and unclear calculation system boundaries of engineering waste.

[0005] To achieve the above object, the present invention provides a method for quantifying carbon emissions of subway engineering slag over its entire life cycle, comprising the following steps: Step 1: Determine the system boundaries and objects of the quantitative method; Step 2: Establish a calculation model for the amount of subway engineering slag generated, and calculate the amount of engineering slag generated based on the size data of subway stations and tunnels; Step 3: Establish carbon emission quantification models for the generation of subway construction waste, the on-site resource utilization of subway construction waste, the transportation of subway construction waste, and the disposal of subway construction waste, and calculate the carbon emissions at each stage based on specific construction equipment and vehicle data information and carbon emission factor parameters; Step 4: Calculate the carbon emissions of subway construction waste over its entire life cycle.

[0006] Preferably, in step one, the system boundaries of the quantification method include the construction waste generation stage, on-site resource stage, transportation stage and disposal stage, and the quantification objects include construction site equipment, vertical transportation vehicles, horizontal transportation vehicles and mechanical equipment in the resource process.

[0007] Preferably, the expression of the subway engineering slag generation calculation model established in step 2 is as follows: ; in, The total amount of slag generated by subway projects, unit: m 3 ; is the excavation diameter of the shield machine, in m; is the length of the shield tunnel, in m; is the looseness coefficient of engineering slag; is the length of the subway station, in m; is the width of the subway station, in meters; is the height of the subway station, in meters; is the correction factor.

[0008] Preferably, the calculation expression of the carbon emission quantification model in the stage of subway engineering slag generation is as follows: ; In the formula, Carbon emissions during the construction waste generation phase, unit: kgCO 2 eq; is the shield machine power, in kw; is the duration of excavation work, unit: h; is the total number of shield sections; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); is the unit working efficiency of the excavator, unit m 3 / h; is the unit energy consumption of the excavator, in L / h; is the diesel carbon emission factor, unit: kgCO 2 eq / L; Indicates the amount of slag generated by subway stations, unit: m 3 .

[0009] Preferably, the calculation expression of the carbon emission quantification model in the on-site resource utilization stage of subway engineering slag is as follows: ; in, Carbon emissions from the on-site recycling of construction waste, in kgCO 2 eq; is the specific gravity of the slag, unit: t / m 3 ; is the on-site resource utilization rate; The power consumption for processing unit slag, unit: kw·h / t; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); The consumption of x-type energy for the new materials produced by resource mining; is the carbon emission factor of type x energy.

[0010] Preferably, the calculation expression of the carbon emission quantification model in the subway project slag transportation stage is as follows: ; In the formula, Carbon emissions from construction waste transportation, unit: kgCO 2 eq; is the power of vertical transportation equipment, in kw; is the working time of vertical transportation, unit: h; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); is the carbon emission factor of transport vehicles, unit: kgCO 2 eq / (t·km); is the transport mass, unit: t; is the transport distance, in km; is the empty car return coefficient.

[0011] Preferably, the calculation expression of the carbon emission quantification model in the subway project slag disposal stage is as follows: ; In the formula, Carbon emissions from construction waste disposal, unit: kgCO 2 eq; The utilization rate of slag resources; The power consumption per unit of slag resource recovery process, unit: kw·h; The consumption of type y energy in the production process of resource-based products; is the carbon emission factor of type y energy; is the landfill rate; is the unit work efficiency of the bulldozer, in m 3 / h; It is the hourly fuel consumption of bulldozer, in L / h.

[0012] Preferably, the calculation expression of the carbon emissions of subway engineering slag in the whole life cycle in step 4 is as follows: ; in, The carbon emissions of construction waste in the whole life cycle, unit: kgCO 2 eq.

[0013] Therefore, the present invention adopts the above-mentioned method for quantifying carbon emissions of subway engineering slag throughout its life cycle, which has the following beneficial effects: (1) The method for quantifying carbon emissions from subway engineering waste in the whole life cycle of the present invention comprehensively considers the overall generation of subway engineering waste, including not only the generation of engineering waste from subway stations and shield tunnels, but also the generation of waste from ventilation shafts and ancillary projects by means of correction coefficients. At the same time, the loose coefficient of subway excavation strata is also considered, which can fully reflect the overall generation of subway engineering waste; (2) Based on the full life cycle theory, the present invention quantifies the carbon emissions of subway construction waste, tracks the carbon emissions of construction waste at different stages, and provides data support for carbon reduction work in construction waste; (3) The present invention quantifies the carbon emissions of different disposal methods for construction waste. Different disposal methods have different degrees of impact on the urban environment. By quantifying the carbon emissions of different disposal methods, an effective reference value is provided for selecting the disposal method for construction waste.

[0014] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is an overall flow chart of a method for quantifying carbon emissions of subway engineering slag throughout its life cycle. DETAILED DESCRIPTION

[0016] The following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 A method for quantifying carbon emissions from subway engineering slag over its entire life cycle comprises the following steps: Step 1: Determine the system boundary and objects of the quantification method; the system boundary of the quantification method includes the construction waste generation stage, on-site resource stage, transportation stage and disposal stage, and the quantification objects include construction site equipment, vertical transportation vehicles, horizontal transportation vehicles and mechanical equipment in the resource process; Step 2: Establish a calculation model for the amount of subway engineering slag generated, and calculate the amount of engineering slag generated based on the subway station and tunnel size data; the specific expression is as follows: ; in, The total amount of slag generated by subway projects, unit: m3 ; is the excavation diameter of the shield machine, in m; is the length of the shield tunnel, in m; is the looseness coefficient of engineering slag; is the length of the subway station, in m; is the width of the subway station, in meters; is the height of the subway station, in meters; is the correction factor.

[0018] Step 3: Establish carbon emission quantification models for the generation of subway construction waste, the on-site resource utilization of subway construction waste, the transportation of subway construction waste, and the disposal of subway construction waste, and calculate the carbon emissions at each stage based on specific construction equipment and vehicle data information and carbon emission factor parameters; The calculation expression of the carbon emission quantification model in the generation stage of subway engineering slag is as follows: ; In the formula, Carbon emissions during the construction waste generation phase, unit: kgCO 2 eq; is the shield machine power, in kw; is the duration of excavation work, unit: h; is the total number of shield sections; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); is the unit working efficiency of the excavator, unit m 3 / h; is the unit energy consumption of the excavator, in L / h; is the diesel carbon emission factor, unit: kgCO 2 eq / L; Indicates the amount of slag generated by subway stations, unit: m 3 .

[0019] The calculation expression of the carbon emission quantification model in the on-site resource utilization stage of subway engineering waste is as follows: ; in, Carbon emissions from the on-site recycling of construction waste, in kgCO 2 eq; is the specific gravity of the slag, unit: t / m 3 ; is the on-site resource utilization rate; The power consumption for processing unit slag, unit: kw·h / t; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); The consumption of x-type energy for the new materials produced by resource mining; is the carbon emission factor of type x energy.

[0020] The calculation expression of the carbon emission quantification model in the subway project slag transportation stage is as follows: ; In the formula, Carbon emissions from construction waste transportation, unit: kgCO 2 eq; is the power of vertical transportation equipment, in kw; is the working time of vertical transportation, unit: h; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); is the carbon emission factor of transport vehicles, unit: kgCO 2 eq / (t·km); is the transport mass, unit: t; is the transport distance, in km; is the empty car return coefficient.

[0021] The calculation expression of the carbon emission quantification model in the stage of subway project waste disposal is as follows: ; In the formula, Carbon emissions from construction waste disposal, unit: kgCO 2 eq; The utilization rate of slag resources; The power consumption per unit of slag resource recovery process, unit: kw·h; The consumption of type y energy in the production process of resource-based products; is the carbon emission factor of type y energy; is the landfill rate; is the unit work efficiency of the bulldozer, in m 3 / h; It is the hourly fuel consumption of bulldozer, in L / h.

[0022] Step 4: Calculate the carbon emissions of subway construction waste over its entire life cycle; the specific calculation expression is as follows: ; in, The carbon emissions of construction waste in the whole life cycle, unit: kgCO 2 eq.

[0023] Example The data in the embodiment are derived from the actual data of a subway project. This embodiment will list the required parameter data and quantify the carbon emissions of subway engineering slag over its entire life cycle based on these data. According to the survey results, take 1.5; correction coefficient According to the survey results, it is determined to be 1.2; empty car return coefficient According to the literature, 1.67 is taken; the required carbon emission factor parameters are selected according to the "Building Carbon Emission Calculation Standard", China Life Cycle Basic Database, and China Product Life Cycle Greenhouse Gas Emission Coefficient Database, as shown in Table 1: Table 1 Summary of carbon emission factors ; This embodiment provides a method for quantifying carbon emissions over the entire life cycle of subway engineering waste. First, a calculation model for the amount of subway engineering waste generated is established to lay a data foundation for the subsequent carbon emission quantification model; then, carbon emission quantification models for the subway engineering waste generation stage, on-site resource stage, transportation stage, and disposal stage are established; finally, the carbon emissions of subway engineering waste over its entire life cycle are the sum of the results of the above-mentioned carbon emission quantification models.

[0024] 1. Calculation of the amount of slag generated in subway projects Subway engineering includes tunnel boring and station excavation. Different construction methods produce different amounts of construction waste and carbon emissions. Common methods for subway tunnel construction are earth pressure balance shield and slurry balance shield. The construction method for station excavation in my country is mainly open cut. For the convenience of calculation, this embodiment assumes that the subway tunnel adopts earth pressure balance shield and slurry balance shield throughout, and the station excavation adopts open cut.

[0025] The amount of subway construction debris generated includes the construction debris generated by subway stations and shield tunnel construction. At the same time, the correction coefficient is used to include the construction debris generated by ancillary projects and ventilation shaft construction into this calculation to ensure that the calculation results are closer to the actual situation.

[0026] The calculation expression of the calculation model for the amount of slag generated in subway projects is as follows: (1); in, The total amount of slag generated by subway projects, unit: m 3 ; is the excavation diameter of the shield machine, in m; is the length of the shield tunnel, in m; is the looseness coefficient of engineering slag; is the length of the subway station, in m; is the width of the subway station, in meters; is the height of the subway station, in meters; is the correction factor.

[0027] The actual data required for calculating the amount of slag generated in subway projects in this embodiment is shown in Table 2.

[0028] Table 2 Actual data required for calculating the amount of slag generated in subway projects ; Substituting the correlation coefficient and the data in Table 2 into formula (1), we can obtain: The amount of engineering debris generated by the shield tunnel is 71515.260 m 3 The amount of construction waste generated by the subway station is 266511.741 m 3 The total amount of construction waste is 354928.352 m 3 .

[0029] 2. Calculation of carbon emissions during the generation of subway construction waste The carbon emissions during the slag generation stage of subway projects include carbon emissions from two processes: shield tunneling and subway station excavation. Among them, the carbon emissions from the shield tunneling process come from the energy consumption of the shield machine, and the carbon emissions from the subway station excavation process come from the fuel consumption of the excavator.

[0030] The calculation expression of the carbon emission quantification model in the generation stage of subway engineering slag is as follows: (2); In the formula, Carbon emissions during the construction waste generation phase, unit: kgCO 2 eq; is the shield machine power, in kw; is the duration of excavation work, unit: h; is the total number of shield sections; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); is the unit working efficiency of the excavator, unit m 3 / h; is the unit energy consumption of the excavator, in L / h; is the diesel carbon emission factor, unit: kgCO 2 eq / L; Indicates the amount of slag generated by subway stations, unit: m 3 , calculated by the following formula: .

[0031] The relevant parameters of the shield machine and excavator are shown in Table 3: Table 3 Parameters of shield machine and excavator ; Substituting the correlation coefficient and the data in Table 3 into formula (2), we can obtain the following result: The carbon emission during the generation of subway construction waste is 2980154 kgCO 2 eq, of which 1805837 kgCO was produced in the shield tunnel section 2 eq, accounting for about 60.6%, and subway station excavation produces 1,174,317 kgCO 2 eq, accounting for about 39.4%.

[0032] 3. Calculation of carbon emissions during the on-site resource utilization phase of subway construction waste The on-site resource utilization stage of subway construction waste refers to the process of screening and managing the excavated subway construction waste. Through the investigation of the implementation project site, the on-site management covers the mud-water separation, sand washing, and filter pressing links. The carbon emissions of this process come from the electricity consumed by the mechanical equipment used in each link. In addition, carbon emissions in the on-site resource utilization stage also involve the substitution and compensation of raw materials, including upstream emissions generated by clay and rock mining. According to the total benefit algorithm, carbon emissions in the on-site resource utilization stage come from the indirect impact of energy consumption and the positive benefits brought by reducing raw material mining.

[0033] The calculation expression of the carbon emission quantification model in the on-site resource utilization stage of subway engineering waste is as follows: (3); in, Carbon emissions from the on-site recycling of construction waste, in kgCO 2 eq; is the specific gravity of the slag, unit: t / m 3 ; is the on-site resource utilization rate; The power consumption for processing unit slag, unit: kw·h / t; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); The consumption of x-type energy for the new materials produced by resource mining; is the carbon emission factor of type x energy.

[0034] In this embodiment, after the construction waste soil is processed for resource utilization, regenerated sand and regenerated unburned bricks are produced. The relevant data of on-site resource utilization of subway construction waste soil are shown in Table 4: Table 4 Data on on-site recycling of subway construction waste ; Substituting the correlation coefficient and the data in Table 4 into formula (3), we can obtain the following result: The carbon emission of the on-site resource utilization stage of subway construction waste is -2432901 kgCO 2 eq, that is, on-site resource processing can reduce carbon emissions by 2432901kgCO 2 eq.

[0035] 4. Calculation of carbon emissions during the transportation of slag in subway projects The transportation stage of subway construction waste is divided into two links: vertical transportation and horizontal transportation. Vertical transportation refers to the process of using vertical transportation equipment to vertically lift the construction waste generated from the underground construction site to the temporary storage site on the ground in the subway underground construction area. The carbon emissions of this process come from the energy consumption of the vertical transportation equipment. Horizontal transportation refers to the process of transporting the construction waste that has been processed on site from the subway construction site to the designated waste disposal site by transport vehicles, and returning to the original site after unloading. The carbon emissions of this process come from the electricity consumption of the transport vehicles.

[0036] The calculation expression of the carbon emission quantification model in the subway project slag transportation stage is as follows: (4); In the formula, Carbon emissions from construction waste transportation, unit: kgCO 2 eq; is the power of vertical transportation equipment, in kw; is the working time of vertical transportation, unit: h; is the carbon emission factor of electricity, unit: kgCO 2 eq / (kw·h); is the carbon emission factor of transport vehicles, unit: kgCO 2 eq / (t·km); is the transport mass, unit: t; is the transport distance, in km; is the empty car return coefficient.

[0037] The vertical transport equipment in this embodiment is a gantry crane, and the horizontal transport vehicle is an electric heavy truck (30 t). Table 5 shows the relevant parameters of the gantry crane and the electric heavy truck (30 t): Table 5 Parameters of gantry crane and electric heavy truck (30t) ; Since part of the construction waste has been recycled on site, the amount of construction waste transported vertically and horizontally is different when calculating the carbon emissions during the transportation stage. The amount of construction waste transported horizontally needs to exclude the amount of construction waste recycled on site.

[0038] Substituting the correlation coefficient and the data in Table 5 into formula (4), we can obtain the following result: The carbon emission of vertical transportation during the transportation of subway construction waste is 217048 kgCO 2 eq, the carbon emissions of horizontal transport are 806854 kgCO 2 eq, that is, the total carbon emissions in the transportation stage is 1023902 kgCO 2 eq.

[0039] 5. Calculation of carbon emissions during the disposal phase of subway construction waste The disposal stage of subway construction waste is divided into two processes: resource recovery process and landfill. The resource recovery process refers to the process of transporting the generated subway construction waste to resource recovery enterprises for disposal and recycling. Landfill is the process of transporting untreated construction waste to landfill for disposal.

[0040] The calculation expression of the carbon emission quantification model in the stage of subway project waste disposal is as follows: (5); In the formula, Carbon emissions from construction waste disposal, unit: kgCO 2 eq; The utilization rate of slag resources; The power consumption per unit of slag resource recovery process, unit: kw·h; The consumption of type y energy in the production process of resource-based products; is the carbon emission factor of type y energy; is the landfill rate; is the unit work efficiency of the bulldozer, in m 3 / h; It is the hourly fuel consumption of bulldozer, in L / h.

[0041] In this embodiment, the resource utilization rate of the slag disposal stage is 25%, and the landfill rate is 30%. For the convenience of calculation, the carbon emission reduction of resource utilization in the disposal stage is calculated in proportion to the carbon emission reduction of resource utilization on site. The relevant data required for the calculation of carbon emissions in the slag disposal stage of subway projects are shown in Table 6: Table 6 Relevant data required for carbon emission calculation in the stage of subway project waste disposal ; Substituting the data in Table 6 into formula (5), it can be calculated that: 29271 kg CO will be generated during the landfill process in the disposal stage. 2 eq, the resource recovery process will reduce carbon emissions by 1351612 kgCO 2 eq, that is, the carbon emissions during the disposal of subway construction waste will be reduced by 1322341 kgCO 2 eq.

[0042] 6. Calculation of carbon emissions from subway construction waste over the entire life cycle The carbon emission quantification model of subway engineering slag in the whole life cycle is the sum of the carbon emission quantification models of the above four stages. The specific calculation expression of the carbon emission of subway engineering slag in the whole life cycle is as follows: (6); in, The carbon emissions of construction waste in the whole life cycle, unit: kgCO 2 eq.

[0043] Substituting the results of the carbon emission model calculations of each stage into formula (6), it can be calculated that the carbon emission of the subway engineering slag in the whole life cycle of this embodiment is 248814 kgCO 2 From the perspective of the entire life cycle, this embodiment calculates and finds that resource processing can greatly reduce carbon emissions, and construction waste soil can achieve its own "carbon neutrality" effect through a certain proportion of resource processing.

[0044] Therefore, the present invention adopts the above-mentioned method for quantifying carbon emissions from the entire life cycle of subway engineering waste, which solves the problem of lack of a carbon emission quantification model for engineering waste from a full life cycle perspective. The quantitative model can also provide analysis and evaluation of engineering waste treatment using different disposal methods, which provides strong support for the environmental benefits of subsequent resource utilization of engineering waste and provides effective guidance for reducing carbon emissions.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for quantifying carbon emissions from subway engineering slag over its entire life cycle, characterized in that: The following steps are involved: Step 1: Determine the system boundaries and objects of the quantitative method; Step 2: Establish a calculation model for the amount of subway engineering slag generated, and calculate the amount of engineering slag generated based on the size data of subway stations and tunnels; Step 3: Establish carbon emission quantification models for the generation of subway construction waste, the on-site resource utilization of subway construction waste, the transportation of subway construction waste, and the disposal of subway construction waste, and calculate the carbon emissions at each stage based on specific construction equipment and vehicle data information and carbon emission factor parameters; Step 4: Calculate the carbon emissions of subway construction waste over its entire life cycle.

2. The method for quantifying carbon emissions of subway construction waste over its entire life cycle according to claim 1 is characterized by: In step one, the system boundaries of the quantification method include the construction waste generation stage, on-site resource utilization stage, transportation stage and disposal stage, and the quantification objects include construction site equipment, vertical transportation vehicles, horizontal transportation vehicles and mechanical equipment in the resource utilization process.

3. The method for quantifying carbon emissions of subway construction waste over its entire life cycle according to claim 2 is characterized in that: The expression of the calculation model for the amount of subway engineering slag generated established in step 2 is as follows: ； in, The total amount of slag generated by subway projects, unit: m 3 ; is the excavation diameter of the shield machine, in m; is the length of the shield tunnel, in m; is the looseness coefficient of engineering slag; is the length of the subway station, in m; is the width of the subway station, in meters; is the height of the subway station, in meters; is the correction factor.

4. The method for quantifying carbon emissions of subway construction waste in the whole life cycle according to claim 3 is characterized in that: The calculation expression of the carbon emission quantification model in the generation stage of subway engineering slag is as follows: ； In the formula, Carbon emissions during the construction waste generation stage, unit: kgCO2eq; is the shield machine power, unit: kw; is the duration of excavation work, unit: h; is the total number of shield sections; is the carbon emission factor of electricity, unit: kgCO2eq / (kw·h); is the unit working efficiency of the excavator, in m 3 / h; is the unit energy consumption of the excavator, in L / h; is the diesel carbon emission factor, unit: kgCO2eq / L; Indicates the amount of slag generated by subway stations, unit: m 3 .

5. The method for quantifying carbon emissions of subway construction waste over its entire life cycle according to claim 4 is characterized in that: The calculation expression of the carbon emission quantification model in the on-site resource utilization stage of subway engineering waste is as follows: ； in, Carbon emissions during the on-site resource utilization of construction waste, unit: kgCO2eq; is the specific gravity of the slag, unit: t / m 3 ; is the on-site resource utilization rate; The power consumption for processing unit slag, unit: kw·h / t; is the carbon emission factor of electricity, unit: kgCO2eq / (kw·h); The consumption of x-type energy for the new materials produced by resource mining; is the carbon emission factor of type x energy.

6. The method for quantifying carbon emissions of subway construction waste over its entire life cycle according to claim 5 is characterized in that: The calculation expression of the carbon emission quantification model in the subway project slag transportation stage is as follows: ； In the formula, Carbon emissions during the construction waste transportation phase, unit: kgCO2eq; is the power of vertical transportation equipment, in kw; is the working time of vertical transportation, unit: h; is the carbon emission factor of electricity, unit: kgCO2eq / (kw·h); is the carbon emission factor of transport vehicles, unit: kgCO2eq / (t·km); is the transport mass, unit: t; is the transport distance, in km; is the empty car return coefficient.

7. The method for quantifying carbon emissions of subway construction waste over its entire life cycle according to claim 6, characterized in that: The calculation expression of the carbon emission quantification model in the stage of subway project waste disposal is as follows: ； In the formula, Carbon emissions during the construction waste disposal phase, unit: kgCO2eq; The utilization rate of slag resources; The power consumption per unit of slag resource recovery process, unit: kw·h; The consumption of type y energy in the production process of resource-based products; is the carbon emission factor of type y energy; is the landfill rate; is the unit work efficiency of the bulldozer, in m 3 / h; It is the hourly fuel consumption of bulldozer, in L / h.

8. The method for quantifying carbon emissions of subway construction waste over its entire life cycle according to claim 7, characterized in that: The calculation expression of the carbon emissions of subway construction waste in the whole life cycle in step 4 is as follows: ； in, It is the carbon emission of construction waste in its entire life cycle, in kgCO2eq.

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