某变电站边坡挡土墙的强夯振动监测

Dynamic Compaction Vibration Monitoring of Slope Retaining Wall in a Substation

某变电站场地平整时,回填区域采用强夯法进行处理,因工期紧张,场坪强夯处理和边坡挡土墙基础同时施工。为评价强夯施工对挡土墙基础的影响范围,需进行强夯振动监测。现场利用多道瞬态面波试验,记录强夯振动波形,对强夯振动时域最大振幅衰减分析,获取不同能级的最不利夯击振动衰减,并根据时域波形进行强夯振动频率分析。结合规范对建筑物振动安全标准的规定,提出适合本工程的振动安全标准,根据强夯振动衰减拟合公式及振动频率确定本工程强夯振动对边坡挡土墙影响的安全距离,为后续类似条件下的强夯振动安全距离评价提供参考。

When a substation site is leveled,the backfill area is treated by dynamic compaction,due to tight schedule,the dynamic compaction treatment of the plant floor and the foundation of the slope retaining wall are simultaneously constructed.In order to evaluate the influence range of dynamic compaction construction on retaining wall foundation,dynamic compaction vibration monitoring is needed.On-site use of multi-channel transient surface wave exploration test,recording dynamic compaction vibration waveform,analyze the maximum amplitude attenuation of dynamic compaction vibration in time domain,obtain the most unfavorable tamping vibration attenuation of different energy levels,and analyze the vibration frequency of dynamic compaction according to the time domain waveform.Combined with the regulations of the code on building vibration safety standards,a vibration safety standard suitable for this project is proposed,according to the dynamic compaction vibration attenuation formula and vibration frequency,the safety distance of the impact of dynamic compaction vibration on the slope retaining wall is determined,which provides a reference for the safety distance evaluation of dynamic compaction vibration under similar conditions.