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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Stability analysis of Hawaiian Island flanks using insight gained from strength testing of the HSDP core
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Stability analysis of Hawaiian Island flanks using insight gained from strength testing of the HSDP core

机译：利用从HSDP岩心进行强度测试获得的见解，对夏威夷岛侧翼进行稳定性分析

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摘要

Hawaiian Island flank failures are recognized as the largest landslide events on Earth, reaching volumes of several thousand cubic kilometers and lengths of over 200 km and occurring on an average of once every 100 000 years. The 3.1 km deep Hawaii Scientific Drilling Project (HSDP) enabled an investigation of the rock mass strength variations on the island of Hawaii [Schiffman, P., Watters, R.J., Thompson, N., Walton, A.W., 2006. Hyaloclastites and the slope stability of Hawaiian volcanoes: insights from the Hawaiian Scientific Drilling Project's 3-km drill core. Journal of Volcanology and Geothermal Research, 151 (1-3): 217-228]. This study builds on that of Schiffman et al. [Schiffman, P., Watters, R.J., Thompson, N., Walton, A.W., 2006. Hyaloclastites and the slope stability of Hawaiian volcanoes: Insights from the Hawaiian Scientific Drilling Project's 3-km drill core. Journal of Volcanology and Geothermal Research, 151 (1-3): 217-228] by considering more in-depth rock mass classification and strength testing methods of the HSDP core. Geotechnical core logging techniques combined with laboratory strength testing methods show that rock strength differences exist within the edifice. Comparing the rock strength parameters obtained from the various volcano lithologies identified weak zones, suggesting the possible location of future slip surfaces for large flank failures. Relatively weak rock layers were recognized within poorly consolidated hyaloclastite zones, with increases in strength based on degree of alteration. Subaerial and submarine basalt flows are found to be significantly stronger.With the aid of digital elevation models, cross-sections have been developed of key flank areas on the island of Hawaii. Limit equilibrium slope stability analyses are performed on each cross-section using various failure criteria for the rock mass strength calculations. Based on the stability analyses the majority of the slopes analyzed are considered stable. In cases where instability (i.e. failure) is predicted, decreased rock mass quality (strength) of the altered and highly poorly consolidated lithologies is found to have a significant influence. These lithologies are present throughout the Hawaiian Islands, representing potential failure surfaces for large flank collapses. Failure criterion input parameters are considered in sensitivity analyses as are the influences of certain external stability factors such as sea level variation and seismic loading.
机译：夏威夷岛的侧翼破坏被认为是地球上最大的滑坡事件，其体积达数千立方公里，长度超过200公里，平均每10万年发生一次。长达3.1公里的夏威夷科学钻探项目（HSDP）使人们能够对夏威夷岛上的岩体强度变化进行研究[Schiffman，P.，Watters，RJ，Thompson，N.，Walton，AW，2006。夏威夷火山的稳定性：夏威夷科学钻探项目3公里钻芯的见解。火山地质与地热研究杂志，151（1-3）：217-228]。这项研究建立在Schiffman等人的研究之上。 [Schiffman，P.，Watters，R.J.，N. Thompson，Walton，A.W.，2006。破火山岩和夏威夷火山的边坡稳定性：夏威夷科学钻探项目3公里钻芯的见解。 [火山与地热研究杂志，151（1-3）：217-228]，其中考虑了更深层的HSDP岩心岩体分类和强度测试方法。岩土岩心测井技术与实验室强度测试方法的结合表明，建筑物内存在岩石强度差异。比较从各种火山岩性获得的岩石强度参数，可以确定薄弱区域，这表明将来可能发生大侧面破坏的滑动面的位置。在弱固结的破硅质岩带中发现了相对较弱的岩石层，强度随着改变的程度而增加。发现海底和海底玄武岩流明显更强。借助数字高程模型，夏威夷岛关键翼面区域的横截面得到了开发。使用各种破坏准则进行岩体强度计算，在每个横截面上进行极限平衡边坡稳定性分析。根据稳定性分析，大多数被分析的斜坡被认为是稳定的。在预测到不稳定（即破坏）的情况下，发现改变和高度不良固结岩性的岩体质量（强度）降低会产生重大影响。这些岩性遍及整个夏威夷群岛，代表了潜在的破坏面，可能导致大型侧面崩塌。在灵敏度分析中考虑了失效准则输入参数，以及某些外部稳定性因素（如海平面变化和地震荷载）的影响。

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