为研究软土地基直升机临时起降平台的安全保障性能, 采用三维数值模拟技术, 建立软土地基与直升机临时起降平台的有限元模型, 分析比较不同加筋层数及软土地基材料的临时起降平台在直升机荷载作用下的最大沉降、土工布受力、填土最大应力以及冗余应力的变化情况, 研究表明在4层加筋的情况下, 起降平台的各指标值最小;并且各指标值随地基土弹性模量的增加而呈指数递减, 土工加筋直升机临时起降平台适用于弹性模量大于1.5 MPa的地基土。
To research the safety performance of helicopter’s temporary landing platform on soft foundation, a 3-D finite element model of soft soil foundation and temporary helicopter landing platform was established. The variations of maximum settlement of the landing platform, geotextile force, maximum stress of the filling soil and redundant stress of different reinforced layers and soft soil materials under helicopter load were analyzed. Results show that in the presence of four layers of reinforcement, the indicators of the landing platform reached the minimum, and reduced exponentially with the increasing of foundation soil’s elastic modulus. The geogrid-reinforced emergency landing platform for helicopters could be applied to soft soil foundation with elastic modulus higher than 1.5MPa.
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