Excess pore water pressure inceased during DJM column installation and disppeared after DJM column installation, it differs with the distance from column and depth.

• 粉喷桩施工使周围土体中的超孔隙水压力增大，超孔隙水压力随距桩心距离和深度的不同而不同，并且超孔隙水压力在施工结束后逐渐消散，加打排水板使得桩周土体的超孔隙水压力值提高的幅度降低，达到最大值的时间和消散时间缩短，这有利于加大土体固结的程度和缩短固结时间；