College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, P.R.China.
College of Civil and Transportation Engineering, Hohai University, Nanjing, P.R.China.
PLoS One. 2020 Apr 16;15(4):e0231624. doi: 10.1371/journal.pone.0231624. eCollection 2020.
The impact of damaged sidewalls at the joints between tubes on dam structures subjected to horizontal seepage is investigated. First, an experimental scheme is designed to test the mode and critical gradient of seepage failure of the soil in the damaged tubes. The effects of various overburden pressures (0, 5, 10, 20, and 30 kPa), hole radii(0.5, 1.0, 1.5, and 2 cm) and soil specimen properties were studied. The test phenomena and the changes in the pore water pressure were used to determine the seepage failure modes and the critical gradients under different conditions. Combined with the modified Terzaghi soil arching theory, a mathematical model was developed for the critical gradient for soil seepage failure. The model fitting curve was in good agreement with the laboratory test results. The critical gradient is independent of the overburden pressure and weakly dependent on the internal friction angle of the soil. The critical gradient increases with the cohesion. For fixed characteristic soil parameters, the critical gradient decreases at a gradually decreasing rate as the radius of the damaged hole increases.
研究了管节之间的损坏侧墙对承受水平渗流的坝体结构的影响。首先，设计了一个实验方案来测试损坏管中土壤的渗流破坏模式和临界梯度。研究了不同上覆压力（0、5、10、20 和 30 kPa）、孔径（0.5、1.0、1.5 和 2 cm）和土样特性的影响。通过测试现象和孔隙水压力的变化，确定了不同条件下的渗流破坏模式和临界梯度。结合修正的太沙基土拱理论，建立了用于土壤渗流破坏的临界梯度的数学模型。模型拟合曲线与实验室测试结果吻合良好。临界梯度与上覆压力无关，与土的内摩擦角弱相关。临界梯度随黏聚力的增加而增大。对于固定的特征土参数，随着损坏孔半径的增大，临界梯度以逐渐减小的速率减小。
