Landslide triggered by small excavation – numerical simulations

IF 1.1 Q3 ENGINEERING, CIVIL

Archives of Civil Engineering Pub Date : 2023-12-21 DOI:10.24425/ace.2023.147660

Michał Grodecki

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Abstract

: The main objective of this work is to present the results of numerical simulations of the landslide triggered by small excavation. In south-eastern Poland in 2019, during excavation for a gas pipeline (relatively small – maximal depth 2.7 m), a landslide was observed. Length of the landslide was about 80 m, width about 50 m, maximal depth 6.5 m. Excavation was partially buried. Observed cracks of the terrain surface were wide, up to 0.8 m. Stability of the landslide was analyzed using the proportionalreductionofthesoilstrengthparameters(c-ﬁreduction)algorithmwiththeuseofZSoil.PC Finite Element Method (FEM) system. Stability analysis of the slope before and after excavation was performed, together with analysis of the tendency of the landslide to propagate upwards. The obtained stability loss modes were compared with the results of the ﬁeld observations and a good correlation was noticed. Hypothesis that a landslide was triggered by small excavation was proved (although reasonable margin of safety was obtained for state before excavation, stability factor SF = 1 . 60). Use of residual soil strength parameters (instead of peak ones) and activation of cut-oﬀ (no tension) condition are advised. Presented methodology is open and can be used in engineering practice.

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小型挖掘引发的山体滑坡--数值模拟

:这项工作的主要目的是介绍小型挖掘引发的山体滑坡的数值模拟结果。2019 年在波兰东南部，在挖掘天然气管道（相对较小，最大深度为 2.7 米）的过程中，观察到了山体滑坡。滑坡长度约为 80 米，宽度约为 50 米，最大深度为 6.5 米。通过使用 ZSoil.PC 有限元方法（FEM）系统，采用按比例降低土体强度参数（c-ﬁ-reduction）算法对滑坡的稳定性进行了分析。对开挖前后的斜坡进行了稳定性分析，并分析了滑坡向上扩展的趋势。获得的稳定性损失模式与现场观测结果进行了比较，发现两者之间有很好的相关性。证明了小规模开挖引发滑坡的假设（尽管开挖前的状态具有合理的安全系数，稳定系数 SF = 1 .60).建议使用残余土体强度参数（而不是峰值参数），并启动无张力条件。所提出的方法具有开放性，可用于工程实践。

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来源期刊

Archives of Civil Engineering ENGINEERING, CIVIL-

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

24 weeks

期刊介绍： ARCHIVES OF CIVIL ENGINEERING publish original papers of the theoretical, experimental, numerical and practical nature in the fields of structural mechanics, soil mechanics and foundations engineering, concrete, metal, timber and composite polymer structures, hydrotechnical structures, roads, railways and bridges, building services, building physics, management in construction, production of construction materials, construction of civil engineering structures, education of civil engineers.