皖江软土路基高真空击密加速度效应研究

针对皖江城市带典型软土路基复杂特点,结合现场监测,对高真空击密软基处理法的软土路基强夯加速度效应进行了分析,并对其加固效果进行了现场载荷试验验证。研究结果表明:高真空击密过程中土体最大加速度与夯击点距离在水平方向和竖直方向上均服从lgy=algx+b的双对数曲线关系,夯击点离测点越近,振动加速度在土体中传播衰减率越大;高真空击密的第一遍低能量强夯在水平方向上的有效影响距离为30 m左右,而在竖直方向上的有效影响深度为6 m左右。加固后的路基承载力特征值达到135 k Pa以上,超过路基设计承载力特征值120 k Pa,现场载荷试验验证了高真空击密法能够较好地处理皖江典型软土路基。

Study on Acceleration Effect of High Vacuum Densification on Soft Soil Roadbed in Wanjiang

In view of the complex characteristic of typical soft soil roadbed in Wanjiang City Belt, this paper, with field monitoring, analyzed the acceleration effect of dynamic compaction for soft subgrade treated by high vacuum densification method (HVDM), besides, verified the effect of reinforcement by field loading test. The research results show that, during high vacuum densification, the soil mass’ max. acceleration and the tamping distance in horizontal and vertical directions submit to the double logarithm curve relation of lgy=algx+b, the closer the distance between the tamping point and the measuring point, the greater the transmission attenuation rate of vibration acceleration in soil; the low-energy dynamic compaction of HVDM has the effective range about 30m horizontally and about 6m vertically. The characteristic value of bearing capacity of the reinforced subgrade is 135kPa or above, exceeding the design value by 120 kPa. HVDM is proved to be a good method treating the typical soft subgrade in Wanjiang by field loading test.