强夯加固风成砂地基的土层沉降研究

SOIL LAYER SETTLEMENT OF COMPACTED AEOLIAN SAND FOUNDATIONS

采用强夯法加固风成砂地基,进行现场土层沉降试验研究。首先对现场土层条件和沉降试验方案、测试方法进行介绍,然后给出并分析了强夯过程中夯击点地表沉降和强夯完成后夯击点下土层沉降试验结果,又通过非线性数据拟合对试验结果进行处理,得到夯击点地表沉降、土层沉降的变化规律。结果表明,夯击点沉降随夯击次数的变化可由双曲线函数来描述,而土层沉降沿深度呈指数函数衰减规律。同时也得到一些关于加固深度的结论。

An experimental study on the settlement of aeolian sand foundations improved by dynamic compaction is carried out. The site soil conditions, the field test arrangement, and the settlement test method are introduced. The test results of the ground surface settlement at the impact point during tamping and the soil-layer settlement beneath the impact point after tamping are given and analyzed. Then the results are processed by nonlinear data fitting, yielding governing laws for the ground surface settlement and the soil-layer settlement. It is found that the change in impact point settlement with the number of drops can be described by a hyperbolic function, and the soil-layer settlement along the depth can be described by an exponential function. Some conclusions about the improvement depth are also obtained.