Carbon Emission

A Study on Low-Carbon Underground Engineering and Technology

Theme Graphic

 

Figure 1. Low-carbon, our goal for future


Project Background
       The excessive emission of greenhouse gas is considered to be the direct cause of global warming by more and more authorities. There is a concerted effort in many countries to control the process of global warming by taking all necessary measures to reduce the emission of greenhouse gas at the moment. As part of the long-term plan for the national economy and social development, emission reduction has also become a binding target in China, and Chinese Government has proposed specific plans in this regard.
       Civil engineering is the core part of infrastructure construction. The massive construction of buildings, tunnels, roads and bridges has stimulated the development of the national economy. However, the huge emission of greenhouse gas in the process of construction has caught researcher’s eyes. From design, construction, operation, maintenance to abandonment, an underground project is closely linked with resource and energy consumption. As a result, a good amount of greenhouse gas is discharged during its life cycle. The country’s requirement for energy saving and emission reduction is actually urging us to make progress with emission measurement, emission control and low-carbon construction technologies.

 

Significance of this Research
       Nowadays, the worldwide recognized concept for “sustainable development” is the development model which “is able to meet the need for both contemporary society and future generations”. To control global warming and enable our cities a sustainable development route, energy saving and emission reduction is ever so important. Therefore getting an accurate computing method is paramount in energy saving and emission reduction. Until now, there are few researches about the calculation and control of carbon emission in the field of underground engineering, and a systematic theory for carbon emission calculation which has a good performance with the industry characteristics is not yet developed. As a result, we are not able to take effective measures to control the carbon emission. To achieve the objective requirement of “low-carbon, green and sustainable” underground engineering, we strongly urge further research on the calculation theory of carbon emission and the technology for carbon emission control.

 

 

Figure 2. Diagram of sustainable development

 

Research Contents
1. Method to know the default coefficient of carbon emission in civil engineering.
2. Computational theory of carbon emission in underground engineering.
3. Forecasting method of carbon emission in underground engineering.
4. Low-carbon technology in underground engineering.

 

Research Achievements
The research group has been working on “low-carbon technology in underground engineering” series of studies since 2012. The main achievements include:
1. We have collected the basic data of energy consumption, material consumption and carbon emission in the Shanghai area.
2. We have already finished the analysis of the composition feature of carbon emission in tunnel projects, and the systematic analysis of computational theory.
3. In the construction project of the super-large shield-driven tunnel in South Hongmei Road, we used IPCC coefficient method to calculate the amount of carbon emission. It’s the first time this method is adopted in a super-large slurry balance shield tunnel in soft soil strata. Furthermore, we have proposed construction measures to reduce carbon emission in soft soil shield-driven tunnel.
4. We are the first to have proposed a method to predict and control carbon emission by numerical simulations of actual excavation.

 

Pictures Related

 

 

Figure 3. South Hongmei Road-Jinhai Road Underwater Tunnel Layout

 


Figure 4. The relation between shield driving and carbon emission

 


Figure 5. The relation between strata and carbon emission

 


Figure 6. Different features of carbon emission in different strata


Papers Published
[1]Jiang Zhiwei, Jiang Haili, Liu Xiaoping, Bai Yun. The Calculation and Research on the CO2 emissions During the Urban Viaduct Construction Cycle [J]. China Municipal Engineering. 2012(2): 86-88+104-105.
[2]Qiaosong Li, Yun Bai, Lin Li, Study of Influential Factors and Measures for Low Carbonization during the Construction of Shield Tunnels [J]. Modern tunneling technology, 2014.

 

Conference Papers
[3]Qiaosong Li, Lin Li, Yun Bai, CO2 Emissions during the Construction of a Large Diameter Tunnel with a Slurry Shield TBM [C]. World Tunnel Congress 2013 Geneva: Underground-The Way to the Future:209-216.
[4]Q.S. Li, Y. Bai, A. Ridout, Z.W. Jiang. Comparative Analysis of CO2 Emissions of Steel Bar and Synthetic Fiber Used in Shield Tunnel Segment[C]// Conference on Civil Engineering and Urban Planning.

Copyright Tongji University Copyright Tongji University News Center, 2012 E-mail:dxb@mail.tongji.edu.cn