高速公路建设CO_2排放计算分析

Calculation and Analysis of CO_2 Emission from Expressway Construction

为了计算与分析高速公路建设产生的CO_2排放,将高速公路建设过程界定在原材料生产、原材料运输和机械施工3个阶段。首先梳理了高速公路建设CO_2排放计算方法,并给出从工程概算表计算CO_2排放量的流程图;然后对西南地区某拟建高速公路上的路基、路面、桥涵和隧道工程分别进行各阶段CO_2排放计算,并分析各自排放构成;最后另划分为道路、桥涵、隧道3种不同工程进行单位工程量CO_2排放水平比较。结果表明:整条高速公路建设CO_2排放主要来自原材料生产阶段,占比89.64%;其次是机械施工阶段,占比9.1l%;原材料运输阶段只占总量的1.25%。不同工程单位CO_2排放水平上,道路工程为6 803t/km,桥涵工程为48 324t/km,隧道工程为37 631 t/km。通过与已有研究的对比讨论,验证了结果的可靠性。

In order to calculate and analyze the c＆bon dioxide （CO2 ） emission during expressway construction, the expressway construction process is defined into 3 stages： production of raw materials, transportation of raw materials and mechanical construction. First, the CO2 emission calculation methods for expressway construction are summarized, the calculation flowchart of engineering CO2 emission is given from the project budget sheet. Second, with the method applied to a proposed expressway in southwest China, CO2 emissions are calculated for stages of subgrade engineering, pavement engineering, bridge engineering and tunnel engineering, and the CO2 emissions＇ components are analyzed in detail. At last, the CO2 emission levels of unit quantity in different engineering types are compared regarding with road engineering, bridge engineering and tunnel engineering. The results indicate that （ 1 ） the total CO2 emission of the expressway comes mainly from raw material production stage, accounting for 89.64% ; （2） the machinery construction phase accounts for 9. 11%; （3） the transport of raw materials stage accounts for only 1.25%. As for comparison of CO2 emission levels of unit quantity in different engineering types, road engineering is 6 803 t/ km, bridge engineering is 48 324 t/km, and tunnel project is 37 631 t/km. By comparison and discussion with the existing studies, the reliability of the results is verified.