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Finite element analysis for identifying locations of cracking and hydraulic fracturing in homogeneous earthen dams
International Journal of Geo-Engineering ( IF 2.6 ) Pub Date : 2021-04-06 , DOI: 10.1186/s40703-020-00139-8
Priyanka Talukdar , Arindam Dey

This paper reports a finite element study to identify the locations of crack initiation in a homogeneous earthen dam at its post-construction and reservoir operation stages. The steady state and transient analyses, including reservoir rise-up and drawdown conditions, are simulated to identify the favorable conditions and locations of crack generation. The behavioral response of the dam is represented in terms of the developed total stress, horizontal deformations of the faces, strain accumulation in the dam, and the differential settlement of the dam base. The locations of post-construction cracks are identified based on the negative minor principal stresses developed on the dam faces. For both single-lift and multiple-lift modeling techniques, the upstream face of the dam is found to be the most favorable location for the crack generation. For transient reservoir operations (rise-up and drawdown scenarios), it is identified that hydraulic fracturing may occur on either faces of the dam at specific heights, governed by the minor principal stresses becoming lesser than the developed pore-water pressure. Depending on whether the reservoir drawdown occurs before or after the attainment of steady-state phreatic level within the body of the dam, the pore-water pressure distribution within the dam are found notably different. This results in hydraulic fracturing occurring at different faces of the dam and at different heights. It is important to have a thorough understanding of the tentative location of the cracks developed in homogeneous earthen dams so that proper mitigation measure can be adopted as per requirement.



中文翻译:

确定均质土坝裂缝和水力压裂位置的有限元分析

本文进行了有限元研究,以识别均质土坝在施工后和水库运营阶段的裂纹萌生位置。模拟稳态和瞬态分析,包括油藏上升和下降条件,以识别有利的条件和裂缝产生的位置。大坝的行为响应以所产生的总应力,面板的水平变形,大坝中的应变累积以及大坝基础的差异沉降来表示。根据坝面上产生的较小的负主应力确定施工后裂缝的位置。对于单举和多举建模技术,都发现坝的上游面是产生裂缝的最有利位置。对于瞬态水库运行(上升和下降情况),已确定在特定高度下,水坝的任一面上都可能发生水力压裂,这是由较小的主应力变得小于已形成的孔隙水压力所决定的。取决于储层降水是在坝体内达到稳态潜水位之前还是之后进行的,发现坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。可以确定的是,在较小的主应力变得小于已形成的孔隙水压力的情况下,在特定高度的水坝的两面上可能发生水力压裂。取决于储层降水是在坝体内达到稳态潜水位之前还是之后进行的,发现坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。可以确定,在较小的主应力变得小于已形成的孔隙水压力的情况下,在特定高度的水坝的两面上都可能发生水力压裂。根据水库降落是在坝体内达到稳态潜水位之前还是之后进行的,发现坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。由次要主应力控制的压力变得小于已发展的孔隙水压力。取决于储层降水是在坝体内达到稳态潜水位之前还是之后进行的,发现坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。由次要主应力控制的压力变得小于已发展的孔隙水压力。取决于储层降水是在坝体内达到稳态潜水位之前还是之后进行的,发现坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。大坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。大坝内的孔隙水压力分布明显不同。这导致在大坝的不同面和不同高度发生水力压裂。全面了解均质土坝中裂缝的暂定位置非常重要,以便可以根据要求采取适当的缓解措施。

更新日期:2021-04-06
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