[논문]취약도 곡선에 의한 수리구조물 하부 지반의 확률론적 침투 안정성 평가

조성은

doi:10.7843/kgs.2021.37.10.41

취약도 곡선에 의한 수리구조물 하부 지반의 확률론적 침투 안정성 평가
Probabilistic Assessment of Seepage Stability of Soil Foundation under Water Retaining Structures by Fragility Curves 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.37 no.10, 2021년, pp.41 - 54

조성은 (한경대학교 건설환경공학부)

초록
AI-Helper

본 연구에서는 침투조절을 위하여 댐이나 보와 같은 수리구조물의 기초지반에 설치되는 차수벽체 형태에 따른 포화 침투거동의 확률론적 거동을 연구하였다. 이를 위해 투수계수의 불확실성과 공간적 변동성을 고려한 정상상태 흐름의 유한요소해석에 기반을 둔 Monte Carlo 시뮬레이션을 수행하였다. Monte Carlo 시뮬레이션의 결과로부터 평가된 지반의 침투거동에 대한 확률분포로부터 수위 변동에 따른 파괴확률을 구함으로써 취약도 곡선을 작성하였다. 취약도 곡선은 침투로 인한 수리구조물과 기초지반의 안정성을 검토하기 위하여 기초지반을 통한 침투유량, 구조물에 작용하는 양압력, 하류 유출면에서의 유출동수경사에 대하여 작성하였다. 생성된 취약도 곡선들로부터 차수벽체 설치 형태가 수위 상승 시 수리구조물과 기초지반의 안정에 대한 신뢰성에 미치는 영향을 연구하였다.

Abstract ▼ AI-Helper

In this study, probabilistic steady seepage behavior of soil foundation beneath water retaining structures according to the location of cutoffs was studied. A Monte Carlo Simulation based on the random finite element method that considers the uncertainty and spatial variability of soil permeability was performed to evaluate the probabilistic seepage behavior. Fragility curves were developed by calculating the failure probability conditional on the occurrence of a given water level from the probability distribution obtained from Monte Carlo simulations. The fragility curve was prepared for the flow quantities such as flow rate through foundation soil, uplift force on the base of structure, and exit gradient in downstream to examine the reliability of the water retaining structure and the foundation soil. From the fragility curves, the effect of the location of cutoff wall on the reliability of water retaining structure and foundation soil according to the rise in water level was studied.

주제어

표/그림 (12)

표 Table 1. Input parameters used for seepage analysis (lognormal distribution)
그림 Fig. 1. Analysis model according to seepage control through foundation
그림 Fig. 2. Results of the Monte Carlo Simulation: probability density function and cumulative distribution function (Model 4, h=20m)
그림 Fig. 3. Results of the Monte Carlo Simulation: effect of the seepage control method on exit gradient (h=11m and h=20m)
그림 Fig. 4. Results of the Monte Carlo Simulation: variation in the estimated mean, standard deviation and COV of exit gradient with water level
그림 Fig. 5. Results of the Monte Carlo Simulation: effect of the seepage control method on uplift force (h=11m and h=20m)
그림 Fig. 6. Results of the Monte Carlo Simulation: variation in the estimated mean, standard deviation and COV of uplift force with water level
그림 Fig. 7. Results of the Monte Carlo Simulation: effect of the seepage control method on exit gradient (h=11m and h=20m)
그림 Fig. 8. Results of the Monte Carlo Simulation: variation in the estimated mean, standard deviation and COV of flow rate with water level
그림 Fig. 9. Fragility curves for piping with respect to varying critical gradients
그림 Fig. 10. Fragility curves for uplift with respect to varying critical uplift forces
그림 Fig. 11. Fragility curves for seepage with respect to varying critical flow rates

참고문헌 (20)

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상세보기
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원문보기 상세보기
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상세보기
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상세보기
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