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例如图5就是采用锤质量为12t、落距17m、夯击地基时土体中冲击加速度的实测分布曲线图。其单击能量为2×10~6J、夯锤触地瞬间的冲击加速度为120g左右,地面下2.5m处即降低为40g、地下6m处为2g,在地下7m处的冲击加速度已经小于g。据分析,这样的振动加速度(冲击加速度)值只能引起土体的弹性变形,不会产生塑性沉降压缩和振密上体。因此在这种能量夯击下的有效加固深度不大于7m。
For example, Fig. 5 is a measured distribution curve of the impact acceleration in the soil when hammer weight is 12t, drop distance is 17m, and the foundation is hit. The click energy is 2×10~6J, and the impact acceleration at the moment of the hammer hits the ground is about 120g. The ground is reduced to 40g at 2.5m below the ground and 2g below the ground at 6m. The impact acceleration at the 7m underground is already less than g. According to the analysis, such a vibration acceleration (impact acceleration) value can only cause elastic deformation of the soil, and will not produce plastic settlement and compaction of the upper body. Therefore, the effective reinforcement depth under this energy slamming is not more than 7m.