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强夯法加固地基由于其施工简单,工程造价低,在世界范围内受到广泛应用。近年来强夯引发的地振动对邻近的建(构)筑物的影响受到业内的日益关注。文章基于高速公路强夯加固地基施工中现场采集的207条振动记录,对强夯振动的峰值加速度与峰值速度随振源距的变化进行了统计分析。参照中国地震烈度表的烈度分级对强夯的地振动效应做出评价,指出《安全爆破规程》由于其振动主频范围原因而并不适应于强夯振动评价,并建议了在该强夯能级下不同结构类型的允许安全距离。
Dynamic consolidation method to reinforce the foundation because of its simple construction, low construction cost, is widely used in the world. In recent years, the influence of ground vibration caused by dynamic compaction on the adjacent structures has drawn more and more attention in the industry. Based on 207 records of vibrations collected during on-site construction by dynamic compaction of expressway, the statistical analysis was made on the changes of peak acceleration and peak velocity of vibratory rammer with vibration source spacing. According to the intensity classification of China Earthquake Intensity Table, the ground vibration effect of dynamic compaction is evaluated. It is pointed out that the “safe blasting procedure” is not suitable for dynamic compaction vibration evaluation due to its main frequency range of vibration, The allowable safety distances for different types of structures.