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首页> 外文期刊>Engineering Geology >Three dimensional characterization of complex mantled karst structures. Decision making and engineering solutions applied to a road overlying evaporite rocks in the Ebro Basin (Spain)
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Three dimensional characterization of complex mantled karst structures. Decision making and engineering solutions applied to a road overlying evaporite rocks in the Ebro Basin (Spain)

机译：复杂的地幔岩溶结构的三维特征。决策和工程解决方案应用于埃布罗盆地（西班牙）上覆蒸发岩的道路

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摘要

At mantle/cover evaporite karst settings, evidences of surficial subsidence are usually strongly dependent on geomechanical properties and spatial inhomogeneities within the cover series. In infrastructure assets, affected by karst processes, the evaluation of mitigation or engineering solutions requires a 3D reconstruction of the underground, karst-affected materials. Analysis and surveillance are also required to avoid deterioration of natural conditions and the migration or the increase in rate of karst features. In the central Ebro Basin, fluvial deposits cover soluble salts (mainly gypsum) located below the regional water table. Variations of geomechanical parameters of the cover, mainly related to carbonate crusts, and the contemporaneous sedimentation of fluvial deposits during karst activity can complicate the characterization of affected volumes. In this work, an integrated analysis including the available information, 3D characterization by means of GPR and three boreholes in a peri-urban road was carried out to finally define the geometry and evolution of karst phenomena. An evaluation of metastable situations is also considered in order to define the zoning for hazard mitigation. This evaluation shows that the volumetric affection to the cover series is in the range of tens of thousands of cubic meters. A proposed list of factors related to social aspects, infrastructure relevance and budget is analyzed. (C) 2015 Elsevier B.V. All rights reserved.
机译：在地幔/覆盖层蒸发岩溶岩溶环境中，表层沉降的证据通常强烈依赖于覆盖层系列内的地质力学性质和空间不均匀性。在受岩溶过程影响的基础设施资产中，缓解措施或工程解决方案的评估要求对受岩溶影响的地下材料进行3D重建。还需要进行分析和监视，以避免自然条件的恶化以及岩溶特征的迁移或增加。在埃布罗盆地中部，河流沉积物覆盖了位于区域地下水位以下的可溶性盐（主要是石膏）。盖层的地质力学参数的变化（主要与碳酸盐结皮有关）以及岩溶活动期间河流沉积物的同时沉降可能会使受影响体积的表征复杂化。在这项工作中，进行了综合分析，包括可用信息，借助GPR进行3D表征以及在城郊道路中的三个钻孔，以最终确定岩溶现象的几何形状和演化。为了定义减轻危害的区域，还考虑了对亚稳情况的评估。该评估表明，对覆盖系列的体积影响在数万立方米的范围内。分析了与社会方面，基础设施相关性和预算相关的建议因素清单。 （C）2015 Elsevier B.V.保留所有权利。

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