The Effect of Targeted Field Investigation on the Reliability of Earth-Retaining Structures in Passive State: A Random Field Approach
| Autor: | Elias Gravanis, Lysandros Pantelidis, Panagiotis Christodoulou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
random finite element method
Probabilistic analysis Field (physics) Scale of fluctuation 0211 other engineering and technologies Soil sampling location 02 engineering and technology 010502 geochemistry & geophysics Retaining wall Civil Engineering 01 natural sciences characteristic value Lateral earth pressure optimal sampling location Limit state design 021101 geological & geomatics engineering 0105 earth and related environmental sciences Mathematics soil sampling location Random field lcsh:QE1-996.5 passive earth pressure Sampling (statistics) Characteristic value Mechanics probabilistic analysis Random Finite Element Method Finite element method lcsh:Geology Moment (mathematics) Optimal sampling location scale of fluctuation Engineering and Technology General Earth and Planetary Sciences Passive earth pressure |
| Zdroj: | Geosciences, Vol 10, Iss 3, p 110 (2020) Geosciences Volume 10 Issue 3 |
| ISSN: | 2076-3263 |
| DOI: | 10.3390/geosciences10030110 |
| Popis: | In one of their recent works, the authors examined parametrically the effect of targeted field investigation on reducing statistical uncertainty in active state analysis of earth retaining structures based on 2165 different cases for each of the sliding and overturning modes of failure. This analysis indicates that the optimal sampling location is always adjacent to the wall, while a sampling domain length equal to the whole height of the wall is suggested to be considered. The present paper deals with the &ldquo symmetrical&rdquo problem of soil under the passive state of stresses. Working in a similar manner, 1879 passive state cases have been considered (also for each of the sliding and overturning modes of failure) in a Random Finite Element Method (RFEM) analysis framework, where soil properties are modeled as random fields while measurements are modeled by sampling from different points of the field domain. The &ldquo actual&rdquo resultant earth passive pressure force (or moment) exerted by the random soil on the retaining wall is compared against the respective &ldquo predicted&rdquo one calculated using the soil property values sampled from the random field. Failure is considered to have occurred when the derived &ldquo force is smaller than the respective &ldquo force. This analysis clearly indicates that the passive state constitutes a different problem, where the optimal sampling distance from the wall is half the wall height. Regarding the depth of exploration, it was again found to be the entire wall height. In addition, the present analysis shows that, the benefit from a targeted field investigation is much greater than the benefit gained using statistical methods for obtaining cautious estimates for the various soil properties the latter refers to the &ldquo characteristic value&rdquo a concept commonly used in the Limit State analysis framework of Eurocode 7. |
| Databáze: | OpenAIRE |
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