| With the rapid development of transportation, a large number of Bridges will have been in construction. However, for the foundation bearing capacity demanding bridge project, the foundation bearing capacity of soft ground or deep parts cannot meet the requirements, which need superior reinforcing effect of explosion compaction method in foundation treatment.In this paper, based on the theory of explosion method, derived from the effective range of formulas and strengthening research particle vibration velocity of the ground, results of the explosion method to Bridge foundation compaction have been discussed in detail. Meanwhile, with another dynamic consolidation method(dynamic compaction)and explosion method to conduct a comprehensive comparative study, final comparison results show that the explosion method of soil compaction effect is better than that of the dynamic compaction method. Therefore, facing the demand higher bearing capacity of bridge engineering, the research of explosive compaction method to reinforce foundation is of great importance to practical promotion. For this research, the paper mainly on the following aspects have been studied:First, introducing the explosion method at home and abroad in recent years research and usage. Then, on the basis of soil plasticity, explosion, etc. spherical charge explosion method is derived for the effective reinforcement scope of formulas. Finally, with the finite element software MIDAS/GTS simulated the effective reinforcement depth of five groups of different charge diameter of 120 mm, 125 mm and 130 mm, 135 mm and 140 mm, and to study its variation.In order to study on earthquake damage of the explosion, away from the central axis of 5m, 10 m, 15 m, 20 m and 25 m disposition setting measuring points, taking in vibration peak velocity of z direction(that is, gravity direction), and have the regression analysis of the results to obtain explosive seismic wave attenuation equation and five vibration velocity attenuation curve.Introduces compaction equivalent quasi-static calculation method,which are approved by the domestic scholars,and based on it to deduce the effective reinforcement depth formula. In the finite element software MIDAS/GTS simulated 8000KN?m of the effective reinforcement depth of soil with single tamping energy, but also to extract from the central axis 5m in Z direction(that is, the gravity direction) vibration peak speed, in order to comparing with the explosion method.For two kinds of dynamic consolidation method in two aspects of effective reinforcement depth and particle vibration velocity were analyzed,and comparing the numerical results: calculated from the equivalent conversion, the energy of the dynamic compaction method using only 120 mm diameter charge explosive detonation energy of 37.6%, This suggests that the effects of the explosion method for compaction effect not only superior compaction, construction technology and engineering and economy are superior to the dynamic consolidation method.Through theoretical study and numerical simulation of calculation, proved that explosion method is superior than dynamic compaction method. And,to be used in bridge Foundation reinforcement are of ideal and practical significance. |
