Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Bearing Capacity Analysis of Pile-Stabilized Slopes under Steady Unsaturated Flow Conditions
When analyzing slopes stabilized by piles, the soil has been commonly considered dry or saturated, whereas soils are usually unsaturated in practice. Suction stress is caused by positive and negative pore water pressures, changing the strength properties of soils compared with soils without considering it and, consequently, leads to various stability conditions of a slope. In this study, a unified formula is presented for estimating soil-pile pressure in which the effect of suction stress is considered in variably saturated soils, which is an important extension of Ito and Matsui’s classical equation. Under such proposed formulation, an attempt has been made to develop a new method by means of the upper-bound limit analysis for analyzing the capacity of an unsaturated slope with vertical steady unsaturated flow reinforced by piles, and the most critical solutions for the optimal limiting surcharge are obtained by the optimization method. By comparing the results of the proposed method with other theoretical and experimental results in some examples, the method’s feasibility is verified. A numerical study for the parametric effects is also provided in this paper, which shows that the limiting surcharge is largely determined by soil properties, slope geometry, as well as seepage conditions. From an engineering application aspect, cost savings could be possible for the construction of slopes if a proper assessment of the effect of suction stress is completed.
Bearing Capacity Analysis of Pile-Stabilized Slopes under Steady Unsaturated Flow Conditions
When analyzing slopes stabilized by piles, the soil has been commonly considered dry or saturated, whereas soils are usually unsaturated in practice. Suction stress is caused by positive and negative pore water pressures, changing the strength properties of soils compared with soils without considering it and, consequently, leads to various stability conditions of a slope. In this study, a unified formula is presented for estimating soil-pile pressure in which the effect of suction stress is considered in variably saturated soils, which is an important extension of Ito and Matsui’s classical equation. Under such proposed formulation, an attempt has been made to develop a new method by means of the upper-bound limit analysis for analyzing the capacity of an unsaturated slope with vertical steady unsaturated flow reinforced by piles, and the most critical solutions for the optimal limiting surcharge are obtained by the optimization method. By comparing the results of the proposed method with other theoretical and experimental results in some examples, the method’s feasibility is verified. A numerical study for the parametric effects is also provided in this paper, which shows that the limiting surcharge is largely determined by soil properties, slope geometry, as well as seepage conditions. From an engineering application aspect, cost savings could be possible for the construction of slopes if a proper assessment of the effect of suction stress is completed.
Bearing Capacity Analysis of Pile-Stabilized Slopes under Steady Unsaturated Flow Conditions
Deng, Bo (Autor:in) / Yang, Minghui (Autor:in)
12.10.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Experimental and Numerical Study of Pile-Stabilized Slopes Under Surface Load Conditions
| Springer Verlag | 2016
Analysis of pile stabilized slopes based on soil–pile interaction
| Elsevier | 2011