黏土地基上基础抗浮模型试验研究

在目前的工程设计中,基础所受浮力都是在确定抗浮水位后直接采用阿基米德定律计算得到的,但该计算值与实际工程中的现场实测数据并不一致,现有的研究成果对此说法不一,比较模糊。针对此问题,采用模型试验,模拟位于饱和黏土地基上基础的受力情况,试验中运用压力传感器测试出基础在饱和黏土中所受浮力的实际大小,并将之与按阿基米德定律计算出的理论值进行比较,结果表明基础所受到的浮力比理论计算值要小得多,仅为理论值的65%左右,这就说明黏土地基中的地下水浮力计算需进行折减,折减程度取决于土体的渗透性、孔隙比等土性参数,所得结果可为今后基础抗浮提供合理建议。

Model Experiment on Buoyancy of Foundation Based on Saturated Clay

The buoyancy of presem projects is calculated directly by Archimedes' law after making sure the water level of anti-uplift. However,the value measured on site is different from the calculated force. For the sake of revealing the essence of problem,there is a model experiment simulated foundation based on saturated clay. All pressure sensors are focused on observing the uplift forces acted on foundation,and the research results indicate that the measured value is smaller than the calculated value by Archimedes'law. Therefore,there is a reduction of buoyancy for foundation based on clay,and the percent reduction,65% for this experiment,is decided by soil property parameters such as penetrability and void ratio. These conclusions can be applied to practice reasonably if the time effect was approved to be inexistent by further experiment.