高频振动沉桩施工对周边环境的影响

Surrounding environment impacts caused by high-frequency vibration pile-driving

从振动桩锤、桩体和土层情况3个方面入手,系统分析了高频振动沉桩施工对周边环境影响的作用机理.首先建立振动沉桩三维有限元模型,实现对沉桩全过程的再现分析;然后验证模型的正确性,并对模型进行变参数分析.研究表明:桩锤激振频率越高,沉桩对环境影响越小;桩锤静载力和桩径越大,沉桩对环境影响越大;砂质土场地比黏土场地更易受振动沉桩影响,且土质越硬,沉桩产生的环境影响越严重.最后,根据参数分析结果提出了减小沉桩施工影响的工程措施.

Considering a vibrating pile hammer, a pile and the soil conditions, the mechanism of influences of high frequency vibration pile construction on surrounding environment were analyzed. A three-dimensional finite element model of vibratory piling was established to reproduce the pile-driving process. Having confirmed validity of the model, variable parameters were investigated. The study showed that influences on the surrounding environment decrease with the frequency of pile hammer, and increase with static load of pile hammer and pile diameter. A sandy soil field was more easily affected by vibratory pile driving as compared to a clay soil field. Moreover, the harder the soil, the more serious environmental impact would be. To reduce the effects of pile construction, measures should be taken based on the analysis.