论文部分内容阅读
随着公路跑道建设的快速发展和粉砂土路基的广泛应用,飞机荷载作用下粉砂土路基稳定性还有待进一步研究。采用拉格朗日差分方法,利用Byrne模型描述饱和粉砂土孔压变化,分析了飞机荷载作用下粉砂土路基孔隙水压力、位移以及瞬时屈服区的变化规律,并通过室内模型试验验证了结果的合理性。研究结果表明:在飞机荷载作用下,粉砂土路基超孔隙水压力、位移分布以及应力状态受加载频率、加载时间及荷载峰值影响较大,其中加载频率5 Hz是一个关键控制指标,在设计中应给予重点考虑。
With the rapid development of highway runway construction and the extensive application of silt subgrade, the stability of silty sand subgrade under aircraft load remains to be further studied. Using the Lagrange method, the Byrne model was used to describe the pore pressure variation of saturated silt soil. The variation of pore water pressure, displacement and instantaneous yielding area of silt subgrade under aircraft loading was analyzed. The indoor model test verified The result is reasonable. The results show that the excess pore water pressure, displacement distribution and stress state of silty sand subgrade are greatly affected by the loading frequency, loading time and load peak. The loading frequency of 5 Hz is a key control index. In the design Should give priority consideration.