荷载循环冲击下跑道软土沉降及孔压变化

Study on settlement and pore pressure change of soft soil in runway under cycle impact loads

飞机起飞降落时荷载循环冲击机场跑道区软土,软土区机场跑道沉降变形对机场安全运行造成影响。采用强夯模拟荷载循环冲击作用,分析软土的承载能力变化。研究发现:随着冲击次数N增加,孔隙水压力有明显上升,但增长速率减缓;软土的沉降量开始快速增大,随后沉降量增速减缓;夯击能越大,则软土的沉降量越大;平板荷载试验中荷载与沉降量呈现近似线性关系,夯点间的沉降量大于夯点下方的沉降量,不同荷载交替循环压实作用效果较好。该研究成果将为机场跑道软土区地基处理提供技术参考。

When airplanes take off and land,they apply cycle loads on the soft soil in the airport runway.The settlement in the airport runway influences airport security operations.Dynamic compaction was used to simulate the cycle impact loads and the load-bearing capacity of soft soil was analyzed.It was shown that the pore water pressure increases obviously with the increase of the number of impacts N,but the growth rate decreases.The settlement of soft soil increases first rapidly and then slowly.The larger the compaction is,the larger the settlement of soft soil is.A linear relationship between the load and the settlement in the plate load test is given.The settlement between the ramming points is greater than that at the lower part of the rammer.The cycle compaction effect of different loads is better.This study will provide a technical reference for the ground treatment of soft soil in airport runway.