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以往振动水冲法只是一种加固地基的方法。应用振动水冲法加固松砂壳坝是否会造成坝坡坍滑,是否会取得同样良好的效果,这些都是人们疑虑的问题。通过兴旺庄土坝振冲加固现场试验,我们发现:振冲时砂土振动加速度随着振源距增大而衰减,振冲时饱和砂土脉动孔隙水压力幅值随着振动加速度增大而增加,它们之间的关系都是幂函数关系。振冲时振冲器周围一米范围内的砂土发生液化而加密。液化的范围是有限的,因而振冲时砂土液化不会造成坝坡坍滑。现场试验还表明:振动水冲法用于加固松砂坝壳是成功的,可以把极松的砂加密到相对密度0.7以上。
In the past, vibrating water was only a method of strengthening the foundation. Whether the use of a vibratory water flooding method to reinforce a loose sand shell dam will result in slippery slopes and whether it will achieve the same good results are all doubts. Through the vibration test of the Xingwangzhuang Earth Dam, we found that the vibratory acceleration of the sand decreases with the increase of the vibration source distance, and the amplitude of the pulsating pore water pressure increases with the vibration acceleration. Increased, the relationship between them is a power function relationship. When vibrated, sand within one meter of the vibrator is liquefied and encrypted. The scope of liquefaction is limited, so that liquefaction of sand during vibratory levitation will not cause slippery slopes. Field trials have also shown that vibratory water flushing is successful for reinforcing loose sand dam shells, and extremely loose sand can be encrypted to a relative density of 0.7 or more.