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The Puvirnituq airstrip pilot project; results from the first three monitoring years

机译:Puvirnituq Airstrip试点项目;前三年的结果

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The Puvirnituq airstrip was originally constructed using a thick embankment to fill a finegrained sediment filled valley. Since the construction of the airstrip, subsidence has been observed in the thick-fill area. Construction work was done in 2009 to allow the landing of a Boeing 737. As part of this work, the thermal and mechanical stabilization of the embankment that fills the valley was realized. A convective embankment with a ventilation system has been constructed. A berm, made with the same convective material was also constructed to resist a possible lateral instability of the embankment. The construction work also included the deviation of the small creek flowing in the valley. The project has two main objectives. First, it aims to improve the heat extraction system design and to validate its effectiveness in the context of the Puvirnituq airstrip. Second, the project aims to refine the evaluation procedure for stability analysis in the context of degrading permafrost. In order to determine the effectiveness of the heat extraction system, thermistor strings have been installed in the convective embankment, under the ground surface and horizontally on the ground surface under the berm. Instrumentation has shown a decreasing active layer thickness between 0.44 and 1.53 meters and evidence of convection in the convective embankment. An inclinometer was also installed at the toe of the embankment. The movement monitored by the inclinometer suggest that only vertical compression movement has occurred since the construction of the convective embankment. The movement observed would therefore be associated with the consolidation of the soil under the embankment weight.
机译:PUVIRNITUQ AIRSTRIP最初使用厚堤,填充精细的沉积物填充谷。由于在厚填充区域中观察到空气仪的构造,沉降。建筑工程于2009年完成,允许登陆波音737.作为这项工作的一部分,实现了填充山谷的堤防的热和机械稳定。已经建立了一种带通风系统的对流堤。还构造了用相同的对流材料制成的浆料以抵抗堤防的可能横向不稳定性。建设工作还包括流入山谷中的小溪的偏差。该项目有两个主要目标。首先,它旨在改善热提取系统设计,并在Puvirnituq AirStrip的背景下验证其有效性。其次,该项目旨在在降解Permafrost的背景下改进稳定性分析的评价程序。为了确定热萃取系统的有效性,热敏电阻串已经安装在对流堤中,在地面下方,水平在底表面上水平。仪器显示出在0.44和1.53米之间的有源层厚度下降,以及对流路堤中的对流证据。倾角仪也安装在堤防的脚趾上。由倾斜计监测的运动表明,自对流路堤的构建以来仅发生垂直压缩运动。因此,观察到的运动将与堤防重量下的土壤固结相关联。

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