TY - JOUR

T1 - Internal Piping Erosion Evaluation of Embankment Dam Considering the Spatial Variability of Soil Properties

AU - Wang, Ruohan

AU - Chen, Guan

AU - Liu, Yong

N1 - Funding Information: This research is supported by the National Natural Science foundation of China (Grant No. 52079099) and the International Joint Research Platform Seed Fund Program of Wuhan University (Grant No. WHUZZJJ202207). Ruohan Wang has received financial support from the China Scholarship Council (CSC). Guan Chen is grateful for the financial support of the Sino-German (CSCDAAD) Postdoc Scholarship Program.

PY - 2024/6/1

Y1 - 2024/6/1

N2 - Piping erosion is a crucial trigger for dam breaches. However, the effects of inherent spatial variability on seepage properties have not been considered adequately, which could lead to a significant underestimation of the risk of piping-erosion-induced dam failure. Additionally, the complex formation mechanism of erosion pipe formation poses challenges in determining the seepage path. This study proposes a probabilistic evaluation framework which combines a hydraulic–mechanical coupling method with random finite-element analysis. Failure indicators, namely hydraulic gradient and kinetic energy, are utilized within this framework. Based on the proposed framework, the spatial variability of soil properties can be considered effectively, and three cases of dams were analyzed. The results show that the proposed framework can provide a macroscopic visualization of the erosion pipe process. In addition, this framework reveals piping erosion occurrence in approximately 40% of hydraulic samples, whereas deterministic analyses fail to detect any instances of piping erosion. This suggests that deterministic analysis considerably underestimates the risk of piping erosion in practice. The effects of the depth of antiseepage measurements on the formation process of piping erosion are discussed. The results indicate that a medium-depth cut-off wall can meet the impervious requirements and reduce the construction cost in engineering practice.

AB - Piping erosion is a crucial trigger for dam breaches. However, the effects of inherent spatial variability on seepage properties have not been considered adequately, which could lead to a significant underestimation of the risk of piping-erosion-induced dam failure. Additionally, the complex formation mechanism of erosion pipe formation poses challenges in determining the seepage path. This study proposes a probabilistic evaluation framework which combines a hydraulic–mechanical coupling method with random finite-element analysis. Failure indicators, namely hydraulic gradient and kinetic energy, are utilized within this framework. Based on the proposed framework, the spatial variability of soil properties can be considered effectively, and three cases of dams were analyzed. The results show that the proposed framework can provide a macroscopic visualization of the erosion pipe process. In addition, this framework reveals piping erosion occurrence in approximately 40% of hydraulic samples, whereas deterministic analyses fail to detect any instances of piping erosion. This suggests that deterministic analysis considerably underestimates the risk of piping erosion in practice. The effects of the depth of antiseepage measurements on the formation process of piping erosion are discussed. The results indicate that a medium-depth cut-off wall can meet the impervious requirements and reduce the construction cost in engineering practice.

KW - Dam breach

KW - Hydraulic conductivity

KW - Piping erosion

KW - Seepage failure

KW - Spatial variability

UR - http://www.scopus.com/inward/record.url?scp=85183325409&partnerID=8YFLogxK

U2 - 10.1061/AJRUA6.RUENG-1218

DO - 10.1061/AJRUA6.RUENG-1218

M3 - Article

AN - SCOPUS:85183325409

VL - 10

JO - ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering

JF - ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering

SN - 2376-7642

IS - 2

M1 - 04024006

ER -