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Reliability of Geotechnical Parameters in the Analysis of Ancient Landslides

机译：古代滑坡分析中岩土参数的可靠性

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More than 850 large scale landslides in the two main active seismic zones (Alborz and Zagros) in Iran have been studied over the past nearly four decades. Of these, remedial designs made by the author for major engineering works in the 180 or so landslides encountered in the projects have, to the present, been successful. This work has led me to the conclusion that, regardless of their geotechnical parameters measured on intact samples in the laboratory, the main cause of forming of these landslides has been occurrence of high magnitude recent and historical earthquakes, combined with micro/mega discontinuities existing within the soil/rock masses. In this study, according to the results of geotechnical studies, the stability analysis of ancient landslides in the area of gas transmission lines (IGAT) in Iran, is discussed. Three samples, taken from slip surfaces of ancient landslides of the two main active zones are discussed. The samples were taken from apparently weak soils, but, unexpectedly, they showed good stability strength. The major occurrences of landslides were in the two mentioned active zones (Zagros and Alborz). In the sampling process of the three landslides, samples representative of apparently geotechnically weak rock or poor soil type were the only ones selected for testing and were taken from slip surface/zones with well-defined natural deformation, remolding and slicken siding. Geotechnical and soil shear parameters measured on samples taken from the slip surface showed apparent good results indicating that a landslide should not occur. However this assumption proved to be misleading, for despite these measurements, land sliding did occur. This was especially so in the case of rockslides.
机译：在过去的近四十年中，已经研究了伊朗两个主要活动地震带（Alborz和Zagros）中的850多个大型滑坡。其中，作者对项目中遇到的180多个滑坡进行的主要工程工作的补救设计到目前为止是成功的。这项工作使我得出的结论是，不管在实验室中对完整样本进行测量的岩土参数如何，这些滑坡形成的主要原因都是发生了近期和历史上的高强度地震，以及内部存在的微观/巨型不连续性。土壤/岩体。在这项研究中，根据岩土工程研究的结果，讨论了伊朗天然气传输线（IGAT）地区古代滑坡的稳定性分析。讨论了从两个主要活动区的古代滑坡的滑移面获取的三个样本。样品取自表面较弱的土壤，但出乎意料的是，它们显示出良好的稳定性强度。滑坡的主要发生在提到的两个活动区（Zagros和Alborz）。在这三个滑坡的采样过程中，只有明显表现出岩土工程上较弱的岩石或土壤类型较差的样品才被选择进行测试，这些样品取自具有明确的自然变形，重塑和滑坡的滑移面/区域。在从滑移表面获取的样品上测量的岩土和土壤剪切参数显示出明显的良好结果，表明不应发生滑坡。但是，该假设被证明具有误导性，因为尽管进行了这些测量，但确实发生了滑坡。对于岩石滑坡尤其如此。

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