摘要
为了研究填土场地邻近基坑强夯时的隔振保护措施,采用有限元数值模型分析了4000 kN·m和6000 kN·m能级强夯作用下隔振沟保护的边坡振动加速度,数值模拟结果表明强夯引起的振动加速度峰值小于抗震设防烈度7度的0.1g要求。之后的现场试验同样证明隔振沟具有良好的边坡隔振保护效果,确定隔振后安全距离可缩短至10~20 m,对隔振沟与振源不同距离的隔振效果试验表明距离越近隔振沟隔振效果越好。数值模拟与现场试验结果表明,采取隔振沟措施的强夯施工对邻近边坡的稳定性无影响,该研究可为今后强夯施工邻近基坑和道路、已建建筑物提供经验和参考。
To investigate the vibration isolation protection measures for the dynamic compaction near the foundation pit of a deep fill site,the vibration acceleration of the slope protected by the vibration isolation ditch under the dynamic compaction of 4000 kN·m and 6000 kN·m levels was analyzed by the finite element numerical model.The numerical simulation results indicate that the peak vibration acceleration caused by dynamic compaction is less than the 0.1g requirement of the seismic fortification intensity of 7 degrees.Subsequent field tests further corroborate the effectiveness of the isolation ditch in providing adequate slope vibration isolation.Moreover,the safe distance after vibration isolation can be reduced to a range of 10-20 m.Evaluating the isolation effect at varying distances between the isolation ditch and the vibration source reveals that proximity enhances isolation effectiveness.Both numerical simulations and field tests demonstrate that the stability of adjacent slopes remains unaffected by the presence of the vibration isolation ditch,thus offering valuable insights and guidance for future construction endeavors involving nearby foundation pits,roads and existing structures.
作者
秦劭杰
戎晓宁
张路银
彭梦凯
董炳寅
QIN Shao-jie;RONG Xiao-ning;ZHANG Lu-yin;PENG Meng-kai;DONG Bing-yin(Guangdong Dadi Geotechnical Engineering Co.,Ltd.,Guangzhou 510670,Guangdong,China;School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《地基处理》
2023年第S02期84-90,共7页
Journal of Ground Improvement
关键词
高能级强夯
深厚回填土
振动监测
隔振措施
既有基坑
high energy level dynamic compaction
deep backfill
vibration monitoring
vibration isolation measures
existing foundation pits
