An extension evaluation model for building safety under the influence of blasting seismic

A multi-index evaluation system of buildings which are under the influence of blasting seismic is established .The assessment safety level of the building is put forward. The value scope correspond to the assessment safety level is obtained. The extension method is used to evaluate building safety which is under the influence of the blasting of the Chongqing subway line 1. Through installing the matter element to be evaluated and calculating the weight coefficient of the indexes, the result value obtained is 2.053.The maximum value of the comprehensive correlation is 0.123 belonging to level 2, and the result is consistent with the actual shock. So the extension evaluation method is proved applicable to estimate the safety degree of the buildings affected by the blasting seismic.