In China, the energy consumption of buildings occupies a greet proportion of the total consumption, causing more and more problems to our environment. Nowadays, with people´s increasing environmental awareness as well as a great pile of new policies, more and more researchers have been researching into the way of energy-saving and ejection-decreasing on buildings, and they did achieve something. However, many researchers pay close attention to this issue only when the bilding is being used, while neglecting other important phases which they should not neglect. For this reason, the research on energy-saving and ejection-decreasing during other phases has a brilliant future, and as one of the most important foundation styles, piled foundation is sure to be researched more extensively.
Based on the analysis of current energy and environmental challenges that China is confronting, the study applied Life-cycle theory into the research of piled foundation energy use and carbon emission. This research established numerical models to estimate energy use from both concrete bored pile and precast pile. This research revealed that: 1 The magnitude of energy use is and The magnitude of carbon emission is ;2 even the building style is the same, the number of concrete bored pile is not more than precast pile both in energy use and in carbon emission; 3 the stage of material making cost the most energy in piled foundation: concrete bored pile about 75%, precast pile more than 85%; put all the energy use and carbon emission of concrete bored pile and precast pile into form; get a formula.
The differences of energy consumption and carbon emission among different kinds of piled foundation from the model results set an example to designers who care about how to choose pile styles. It also can help the government to eliminate under-developed one. The way of calculating the costs of energy use and carbon emission in the study can also set an example to others, so that we can eva luate the objective much more scientifically.
Keywords:LCA; piled foundation; energy use; environmental impacts