橡胶气囊在地基强夯加固中的隔振效果及 隔振参数优化

通过强夯室内模型试验研究橡胶气囊的隔振效果并对其隔振参数进行优化; 采用单因素分析方法,依次开展不同隔振宽度、隔振距离、隔振长度、隔振深度的橡胶气囊室内模型试验; 通过检测隔振板两侧质点振动最大加速度分析橡胶气囊隔振板的隔振效率,研究不同隔振参数对橡胶气囊隔振效率的影响规律。结果表明:1 500 kN·m夯击能下橡胶气囊具有良好的隔振效果; 隔振宽度对橡胶气囊的隔振效果基本没有影响; 当振源与两传感器测点的距离相同时,隔振距离对橡胶气囊的隔振效果也基本没有影响; 隔振长度在12 m范围内和隔振深度在6 m范围内对橡胶气囊的隔振效果影响较大,且二者超出各自范围后隔振效果增加不显著; 隔振深度对橡胶气囊隔振效率的影响程度要高于隔振长度对橡胶气囊隔振效率的影响程度; 1 500 kN·m夯击能下橡胶气囊隔振的最佳隔振参数为隔振长度12 m,隔振深度6 m,隔振宽度和隔振距离根据现场条件确定; 通过强夯现场试验验证了1 500 kN·m夯击能下橡胶气囊的隔振效果优于碎石填充沟的隔振效果,且橡胶气囊的隔振效率约为空沟隔振效率的95%左右; 相关成果可为地基强夯加固振动控制技术的应用提供参考。

Vibration Isolation Effect and Parameter Optimization of Rubber Gasbag in Foundation Dynamic Compaction

The vibration isolation effect of rubber airbag was studied by indoor model test of dynamic compaction and the vibration isolation parameters were optimized. The single-factor analysis method was used to carry out the indoor rubber airbag model tests of different vibration isolation width, vibration isolation distance, vibration isolation length and vibration isolation depth. The vibration isolation efficiency of rubber airbag was analyzed by detecting the maximum acceleration of particle vibration on both sides of the vibration isolation plate. The influence of different isolation parameters on the isolation efficiency of rubber airbag was studied. The results show that the rubber airbag has good vibration isolation effect under the ramming energy of 1 500 kN·m. The vibration isolation width has no effect on the vibration isolation effect of rubber airbag. When the distance between the vibration source and the measuring points of the two sensors is the same, the vibration isolation distance has no effect on the vibration isolation effect of rubber airbag. The vibration isolation effect of rubber airbag is greatly influenced by the vibration isolation length within 12 m and the vibration isolation depth within 6 m, and the vibration isolation effect does not increase significantly after the two parameters go beyond their respective ranges. The effect of vibration isolation depth on the vibration isolation efficiency of rubber airbag is higher than that of vibration isolation length. Under the ramming energy of 1 500 kN·m, the optimal vibration isolation parameters of rubber airbag are the vibration isolation length is 12 m, the vibration isolation depth is 6 m. The vibration isolation width and vibration isolation distance can be determined according to field conditions. The field test of dynamic compaction verifies that the vibration isolation effect of rubber airbag under the ramming energy of 1 500 kN·m is better than that of gravel filled ditch, and the vibration isolation efficiency of rubber airbag is about 95% of that of hollow ditch. The related results can provide reference for the application of vibration control technology of foundation dynamic compaction.