对于地基承载力要求严格的桥梁工程，部分软弱地基或深层地基的承载力无法满足要求时，就需要用加固效果优越的爆炸挤密法进行地基处理。 以爆炸法的理论为基础，从有效加固范围公式推导和地面质点振动速度的研究入手，对爆炸法挤密桥梁地基的效果进行详细探讨。同时，借助另一个动力固结法（强夯法）与爆炸法进行全面的对比研究，最终对比结果表明爆炸法的挤密土体的效果优于强夯法。面对承载力需求较高的桥梁工程，对爆炸挤密法加固地基土的研究，具有十分重要的实际推广意义。针对此研究课题，本文主要对以下几个方面做了研究： (1)介绍了爆炸法近些年在国内外的研究和使用情况。再以土的塑性力学，爆炸力学等为基础，推导出了球形装药爆炸法的有效加固范围公式。最后，以MIDAS/GTS有限元软件模拟计算五组不同装药直径120mm、125mm、130mm、135mm和140mm时的有效加固深度，研究其变化规律。 (2)为了进行对爆炸震害的研究，在距离中心轴5m、10m、15m、20m和25m处分别设置测点，提取其Z方向（即重力方向）振动峰值速度，进行结果的回归分析，得到爆炸地震波的衰减方程和五组振动速度衰减曲线。 (3)介绍了国内学者较为认可的强夯等效拟静力计算法，推导出了以此法为依据的有效加固深度公式。在以MIDAS/GTS有限元软件模拟8000KN m能量为单次夯击能时的土体有效加固深度，也要提取其在距离中心轴5m处的Z方向（即重力方向）振动峰值速度，以便与爆炸法进行比较。 (4)对两种动力固结法在有效加固深度和质点振动速度两个方面进行对比分析，在对数值模拟结果进行比较后，可以认为爆炸法的挤密效应要好于强夯法，并且在施工工艺和工程经济性上都要优于强夯法。从爆炸当量换算的方面计算得到，强夯法的能量利用只为120mm装药直径炸药爆轰能量的37.6%。 通过理论研究和数值模拟的计算，证明爆炸法优于强夯法。将其运用于加固桥梁地基处理有很理想的实际意义。

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, 10m, 15m, 20m and 25m 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.