Reliability analysis of riverbank stability accounting for the intrinsic variability of unsaturated soil parameters

Gottardi, Guido; Gragnano, Carmine Gerardo; Ranalli, Marco; Tonni, Laura

doi:10.1016/j.strusafe.2020.101973

Cited by 10 publications

(6 citation statements)

References 56 publications

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Section: Boundary and Initial Conditionssupporting

confidence: 63%

“…In order to simulate a realistic series of river flood events, data from the sudden collapse occurred on 19 January 2014 on river Secchia (Figure 2a) were taken as reference. In this particular case, the hydrograph recorded from 25 December 2013 to 19 January 2014 was characterized by a rapid series of three hydrometric peaks, which occurred in about one month [41]. Similarly, in the present analysis, a synthetic Soil permeability of the foundation layer was considered constant (only saturated conditions) and equal to its saturated value, while the soil forming the embankment was assumed as partially saturated considering the average parameters listed in Table 3 and Equations ( 3) and ( 5) as retention and hydraulic functions.…”

Section: Numerical Analysis On the Hydraulic Response And Stability Assessment 41 Seepage Analysesmentioning

confidence: 90%

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Experimental and Numerical Investigations of a River Embankment Model under Transient Seepage Conditions

et al. 2021

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The evaluation of riverbank stability often represents an underrated problem in engineering practice, but is also a topical geotechnical research issue. In fact, it is certainly true that soil water content and pore water pressure distributions in the riverbank materials vary with time, due to the changeable effects of hydrometric and climatic boundary conditions, strongly influencing the bank stability conditions. Nonetheless, the assessment of hydraulic and mechanical behavior of embankments are currently performed under the simplified hypothesis of steady-state seepage, generally neglecting the unsaturated soil related issues. In this paper, a comprehensive procedure for properly defining the key aspects of the problem is presented and, in particular, the soil characterization in partially saturated conditions of a suitably compacted mixture of sand and finer material, typical of flood embankments of the main river Po tributaries (Italy), is reported. The laboratory results have then been considered for modelling the embankment performance under transient seepage and following a set of possible hydrometric peaks. The outcome of the present contribution may provide meaningful geotechnical insights, for practitioners and researchers, in the flood risk assessment of river embankments.

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Section: Boundary and Initial Conditionssupporting

confidence: 63%

Section: Numerical Analysis On the Hydraulic Response And Stability Assessment 41 Seepage Analysesmentioning

confidence: 90%

Experimental and Numerical Investigations of a River Embankment Model under Transient Seepage Conditions

et al. 2021

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“…The knowledge of bank failure mechanisms is crucial for the identi cation of suitable stabilization measures and management of bank erosion problems (Osman andThorne, 1988, Thorne, 1992). Riverbank stability evaluation under dynamic climate variables is necessary for the safety against unexpected bank failures and subsequent consequences in terms of damage and cost-effective countermeasures (Gottardi et al 2020). The classical limit equilibrium-based approach is not applicable for the riverbank stability analysis under the dynamic wetting-drying conditions due to the limitation in de ning the pore water pressure conditions under different ow events (Dapporto et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydraulic Response Time of Tensiometer in Hydraulic Characteristics Estimation for Riverbank Sand

Patwa

Bharat

2022

Geotech Geol Eng

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The knowledge of the continuous evolution of soil hydraulic characteristics is required for several environmental geotechnical applications such as capillary barrier systems and river bank slope stability analysis. Such data are obtained in the eld by embedding suction sensors in slopes for stability analysis. The hydraulic equilibrium time and other limitations of sensors in establishing the hydraulic characteristics are not available for the compacted soils. Thus the in uence of initial soil moisture content, initial wetting condition of the suction sensor, and soil compaction density on the hydraulic equilibrium time of the tensiometer was studied on riverbank sand. A laboratory method considering the equilibrium data at each saturation/drying state was proposed for establishing the equilibrium-SWCC data. The hydraulic equilibrium time of the tensiometer for the studied soil was found to vary from few hours to several days depending upon the magnitude of suction and state of the sensor. The conventional method for estimating the instantaneous SWCC severely overestimated the suction values at a given water content. The sensor response time was found to be the single most in uencing factor in the estimation of soil hydraulic characteristics. The in-situ tensiometer application should be replaced with the moisture sensor readings combined with the lab-based proposed equilibrium SWCC approach.

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“…In addition, it also highlights the cost of discrete manufacturing companies. Precisely because of the complex structure of large-scale discrete equipment, multiple levels such as product sets of parts and components generally need to be subdivided according to the progressive relationship of production cycle and product structure, and the bottleneck of corporate resources is mainly concentrated important parts (or main parts) [7]. ese components and parts are the key control points in the cost control process of large-scale discrete equipment.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Simulation of Accounting Information Practice Model Assisted by Discrete Dynamic Events

Han

2022

Mathematical Problems in Engineering

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The performance function expressed by the expected value of the discrete event dynamic system usually does not have a closed analytical expression, so it can only be estimated by the Monte-Carlo method. The inherent limitations of the Monte-Carlo method (low simulation efficiency) and the complexity of the system bring a lot to the simulation optimization problem. A huge challenge has come. A reasonable combination of mathematical methods and computer simulation technology is an important direction to study the optimal design of DESD. On the basis of linear systems on maximal algebras, this article studies a class of multimodel systems on maximal algebras. This article presents a non-Markov DEDS time-synchronized parallel simulation algorithm and proves that the common random number method can maximize the simulation efficiency of an existing event-synchronized algorithm. We take advantage of the inherent parallelism of genetic algorithm, and combine the idea of parallel simulation and DEDS order optimization to give an optimization algorithm for discrete parameter space DEDS. This article discusses the relationship between ultimate control, internal control, and accounting information quality. This article analyzes the relationship between ultimate control right, internal control, and accounting information quality. We use the manipulated accruals calculated by the modified Jones model and the earnings response coefficient of the earnings-return model to measure the quality of accounting information, and analyze the impact of the ultimate control ratio and internal control level on the quality of accounting information. Based on the difference in the nature of the controller and the ratio of ultimate control rights, this article examines the difference in the effect of internal control on the quality of accounting information in companies with high and low ratios of ultimate control rights. The robustness tests of the two accounting information measurement models are carried out, respectively, and the results obtained are basically consistent with the empirical research conclusions. The situation is the most important to its own development. Among them, the asset turnover rate has a greater effect on the early warning of corporate financial crisis, and the status of the current asset turnover rate and the total asset turnover rate in the financial early warning is also crucial. This article studies the correlation between the overall level of internal control and the quality of accounting information, avoiding the one-sidedness caused by using a single index to measure the level of internal control.

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Reliability analysis of riverbank stability accounting for the intrinsic variability of unsaturated soil parameters

Cited by 10 publications

References 56 publications

Experimental and Numerical Investigations of a River Embankment Model under Transient Seepage Conditions

Experimental and Numerical Investigations of a River Embankment Model under Transient Seepage Conditions

Influence of Hydraulic Response Time of Tensiometer in Hydraulic Characteristics Estimation for Riverbank Sand

Optimization and Simulation of Accounting Information Practice Model Assisted by Discrete Dynamic Events

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