【摘要】 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.基于高速公路强夯加固地基施工现场采集的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(GB/T 17742-1999)的烈度分级和《安全爆破规程》(GB6722-2003)的允许振速,对强夯的地震动效应作出评价,并建议在该强夯能级下不同结构类型的允许安全距离.更多还原

【Abstract】 Being of the simple constructing procedure and low cost,dynamic compaction method was widely used in the foundation consolidation around the world.Recently,the vibration effect due to the dynamic compaction on the adjacent structures was highlighted in the construction field.Based on 207 vibration records recorded in-situ during the construction of foundation consolidation by the way of dynamic compaction,the statistical analysis respecting to the peak ground acceleration(PGA) and peak ground velocity(PGV) was performed.Referring to the earthquake intensity classification of the "China Earthquake Intensity Table"(GB/T 17742-1999) and the allowable vibration velcity of the "Safe Blasting Regulation"(GB6722-2003),the vibration assessment for the dynamic compaction was carried out.The allowable safety distance for the different structures with the dynamic compaction under the specified energy grade was proposed as well.更多还原