Modified Rammsonde tests in layered compacted snow
Modified Rammsonde tests in layered compacted snow
复制标题
层状压实雪中改进的拉姆探空仪测试
DOI：
10.13679/j.advps.2019.0003
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发表时间：
2019-06
影响因子：
--
通讯作者：
Li Wei
中科院分区：
文献类型：
--
作者：
Zhuang Feng;Lu Peng;Li Zhijun;Han Hongwei;Li Wei
随着南极洲冰雪跑道建设的发展，对雪的物理和力学性质的研究一直是研究人员感兴趣的话题。为了评估分层压实的季节性雪的强度，2018年初在中国哈尔滨进行了使用改进的Rammsonde的渗透测试。与以往型号相比，改进后的Rammsonde整体更轻，分辨率提高，更适合季节性积雪;机械结构进行了调整，深度数据的阅读更方便。共进行了74次贯入试验，并对试验结果进行了定性和定量分析。这些分析的结果证明了该设备的适用性，并揭示了几个因素影响锥形压强度计的分层压实的季节性雪的强度的估计。这些因素包括围压、穿透能量和雪材料特性，特别是经受穿透的雪的压实。还建立了穿透压力与雪密度之间的线性关系。研究了时效硬化对雪粒侵彻压力的影响，并通过显微镜观察了雪粒的微观结构。这些分析表明，本研究中应用的圆锥贯入仪和数据处理方法能够快速估计季节性雪的强度，经进一步修改后可以应用于南极洲。这将为我国南极冰盖机场的设计提供科学依据。引用文献：庄芳，卢平，李志杰，等。分层压实雪中的改良式雷氏探空仪试验。Adv Polar Sci，2019，30（2）：118-131，doi：10.13679/j.advps.2019.0003
Investigation of the physical and mechanical properties of snow has long been a topic of interest to researchers as the construction of compacted-snow runways in Antarctica developed. In an attempt to assess the strength of layered compacted seasonal snow, penetration tests using modified Rammsonde were conducted in Harbin, China in early 2018. Compared with previous models, the modified Rammsonde is lighter overall, with improved resolution; thus, it is more suitable for seasonal snow; the mechanical structure was adjusted, and the reading of depth data is more convenient. A total of 74 penetration tests were carried out and the results were analyzed both qualitatively and quantitatively. The results of these analyses demonstrated the applicability of the device, and revealed that several factors affect the cone penetrometer’s estimate of the strength of the layered compacted seasonal snow. Such factors include the confining pressure, penetration energy, and the snow material properties, particularly the compaction of the snow undergoing penetration. A linear relationship between the penetration pressure and snow density was also established. The effect of age hardening on the penetration pressure was studied and the microstructure of the snow particles was observed through a microscope. These analyses showed that the cone penetrometer and data processing methodology applied in this study enable a rapid estimate of strength in seasonal snow, and may be applied in Antarctica after further modification. This would provide a scientific basis for the design of China’s Antarctic ice sheet airport. Citation: Zhuang F, Lu P, Li Z J, et al. Modified Rammsonde tests in layered compacted snow. Adv Polar Sci, 2019, 30(2): 118-131, doi: 10.13679/j.advps.2019.0003
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