Study On The Impact Of The Stability Of Surrounding Buildings Under Deep Foundation Support Blasting

As the progressive application of blasting technology at the dismantling of deep foundation support, the hazard of blasting vibration on the surrounding buildings and the semi-finished products and the exterior-protected construction in excavation also got more and more attention. In the past, we regard particle velocity as a standard to evaluate damage to structures; however, the standard can't gradually meet the need of safety in blasting because of its unilateralism. Therefore, the paper explained the whole dynamical action of seismic wave to structures, and provided some advice to control damage caused by blasting vibration.This article proceeded from the characteristics of blasting demolition on the deep foundation support, analyzed the formation of blasting seismic wave and the features of spread, and comprehensive exposed the characteristics of blasting seismic wave. Through the power balance equation and the constitutive equation described the numerical method of blasting seismic wave propagation.Combined the conditions of blasting demolition on the deep foundation to support of Guang Ke Long Edifice, formulated the test program of blasting vibration. Using high-precision portable IDTS3850 type vibration logger to monitor by multi-point on the surrounding of buildings. Applying for ppv- regression to particle vibration, single go-off apothecaries and distance to draw more realistic regression formula.In order to show the effect of blasting seismic wave on surrounding buildings directly, the paper adopt spectrum analyses module of ANSYS to reckon effect through module expansion and fold combined with vibration spectrum. Truly reflected of the displacement of surrounding buildings under the influence of blasting seismic waves, provided the basis for formulating a reasonable blasting program.The conclusion shows the effect of surrounding buildings in blasting vibration on the deep foundation support. And it was proved to be reliable in engineering practice. So it could be a reference manual for blasting engineering.