斯里兰卡卡杜甘纳瓦复杂地质环境中易发生山体滑坡地形的风险评估:对公路维护的影响

Sunera Mahinsa Pitawala, Harindu Wimalakeerthi, Thomas Heinze
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引用次数: 0

摘要

斯里兰卡连接首都科伦坡和第二首都康提的主要公路要经过卡杜甘纳瓦,这里山势陡峭。该地形的地质和地貌环境经常导致斜坡崩塌。本研究的目的是解释影响在两个不同位置、两种不同斜坡条件下发生的斜坡崩塌的关键因素。典型的局部和区域性脆性和韧性结构包括断层疤痕、深层剥离和可变褶皱。根据我们的研究结果,其中一个研究地点由于基底岩石表面减弱、亲水性粘土矿物和人为因素的影响而发生了平移滑坡,而另一个研究地点则受到非均质冲积土壤以及区域、地质和水文地质条件的影响,发生了多阶段的质量移动。根据本研究,可以得出结论,地质研究必须在当地而不是区域范围内进行。否则,在复杂地质环境中为防止山体滑坡而进行的建设将失败或可能长期无法使用。此外,在具有挑战性的地形上进行施工时,必须考虑到未来的气候变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Risk Assessment in Landslide-Prone Terrain within a Complex Geological Setting at Kadugannawa, Sri Lanka: Implications for Highway Maintenance
The major highway in Sri Lanka that links the capital, Colombo, with the second capital, Kandy, passes through Kadugannawa, characterized by steep hills. The geological and geomorphological setting of the terrain often leads to slope failures. The objective of this study is to interpret the key factors influencing the slope failures that occurred in close proximity at two separate locations with two different slope conditions. Typical local and regional brittle and ductile structures include fault scarps, deep-seated detachments, and variable folding. According to our results, one of the studied locations experienced translational landslides because of weakened basement rock surfaces, hydrophilic clay minerals, and anthropogenic influences, whereas the other location experienced multiple stages of mass movement influenced by inhomogeneous colluvial soil and regional, geological, and hydrogeological conditions. Based on the present study, it can be concluded that geological studies must be carried out within the local area rather than at the regional scale. Otherwise, the constructions for the prevention of landslides in complicated geological settings will fail or may not be used for a long period. Moreover, consideration of future climate change is essential when undertaking construction in challenging terrains.
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