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通过分析强夯孔压和变形的现场试验数据及数值模拟结果,对强夯加固粉土地基孔压及变形特性进行了研究,得出如下结论:(1)超孔压随夯击次数增加而增大,其累积曲线的斜率随着夯击次数增加逐渐趋近于零,浅层土超孔压累积值远大于深层土;(2)地面沉降量在第一击时最大,而后随着夯击数的增加而减小,并逐渐趋于一定值,到止夯时,不同夯击能地面沉降变形累计值近似相等;(3)强夯土体扰动大致分为强扰动区(-4~0m)、弱扰动区(-8~-4m)和微扰动区(-8m及以下),其中强扰动区和弱扰动区作为主扰动区,是主要加固区域;(4)超孔压的产生和消散远滞后于沉降变形,表明了超孔压的滞后性。
By analyzing the field test data and numerical simulation results of the pore pressure and deformation of dynamic compaction, the pore pressure and deformation characteristics of the dynamic compacted consolidated silt ground were studied. The conclusions are as follows: (1) The excess pore pressure increased with the number of impacting The cumulative slope of the cumulative curve gradually approaches zero with the increase of the number of tamping, and the cumulative pore water pressure of shallow soil is much larger than that of deep soil. (2) The amount of ground subsidence is the largest at the first strike, (3) The dynamic rammed earth body disturbance can be roughly divided into strong disturbance zone (-4 ~ 0m), weak disturbance zone (-8 ~ -4m) and micro disturbance zone (-8m and below), of which the strong disturbance zone and weak disturbance zone are the main disturbance zones and are the main reinforcement zones; (4) And dissipated far behind the settlement deformation, indicating the lag of excess pore pressure.