翻板抛投土工包沉落轨迹与落域

针对河口海岸工程中翻板滑抛土工包入水后落点位置无法准确预测的问题,对抛投土工包进行了受力分析,提出了落点坐标的理论计算公式;基于实际工程中的施工参数,采用物理模型水槽开展沉落规律试验,研究了不同水深和流速条件下的土工包沉落规律,得到了土工包阻力系数的经验公式。沉落轨迹物理模型试验与理论计算结果对比表明:浅水条件下由落点坐标公式计算得到的沉落轨迹与模型试验结果吻合度较好;深水条件下土工包容易发生翻转,落点离散程度稍大;对于工程中通常所用的填砂口周长8 m、长度62m、充填率为78.54%的土工包,其水平阻力系数和竖向阻力系数的变化范围分别为0.30~4.27和0.84~2.53。

Settling trajectories and placement for geocontainers dumped from a bevel

For the situation that the placement of bevel dumped geocontainers cannot be accurately predicted in estuarine and coastal engineering, theoretical computational formulas of the settling coordinates were presented through force analysis of the dumped geocontainers. Experimental study was carried out in a flume based on the construction parameters in practical engineering. Settling characteristics of the geocontainer were investigated under the condition of various water depth and flow velocities and thus empirical formulas of the drag coefficients were obtained. The comparison between experiment and calculation shows that the calculated trajectories of the geocontainer agree well with the experimental ones in shallow water. Geocontainers are more likely to rotate under the condition of deep water, which causes a slight increase in the dispersion of horizontal settling distance. For the geocontainers widely used in practical projects with 8m in the perimeter of sand-filling opening, 62 m in length and 78.54% of the filling ratio, the horizontal and vertical drag coefficients of the geocontainer range from 0. 30 to 4.27 and 0.84 to 2.53 respectively.