强夯加固粉土地基地面振动衰减规律研究

为研究强夯加固粉土地基地面振动衰减规律并确定强夯影响范围,依托济南-东营高速公路工程,对不同夯击能强夯加固粉土地基地面振动的速度幅值及振动频谱进行了现场测试,并基于测试数据通过量纲分析推导了强夯加固粉土地基地面振动衰减规律的计算公式。研究表明:(1)地面振动速度随距离增加呈现出不同的衰减区;(2)单击夯击能越大,强夯施工对邻近环境不利影响的范围越大,单击夯击能相同时夯击次数越多,对邻近环境影响范围越大;(3)地面振动衰减与夯击能和夯锤面积相关,随夯检距离呈负幂函数衰减,量纲分析推导出粉土地基地面振动衰减公式,经验证是合理的。

Study on Ground Vibration Attenuation Law of Silt Foundation Treated with Dynamic Compaction

In order to study the ground vibration attenuation law of silt foundation treated with dynamic compaction and determine the safe construction impact areas, the velocity amplitude and spectrum of ground vibration during dynamic compaction of different tamping energies were measured on the site combined with Jinan-Dongying Highway project. According to the test results, the safe construction impact areas of different tamping energies were determined and the calculation formulas of ground vibration attenuation was derived with the method of dimension analysis. Results show:(1) the ground vibration has different attenuation areas with the increase of distance; (2) the lager the tamping energies are, the greater the adverse effect range of dynamic compaction construction is, and the more the tamping times are, the greater the range is when the tamping energies are the same; (3) the ground vibration attenuation of silt foundation is related to tamping energy and tamping area, presenting negative power function, and the calculation formula of ground vibration attenuation, derived through dimensional analysis, is proved reasonable.