[논문]기초의 강성과 상재하중이 보강토 옹벽의 거동에 미치는 영향

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초록
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본 논문에서는 유한요소해석을 통해 기초지반의 강성과 상재하중이 블록식 보강토 옹벽에 미치는 영향을 고찰한 내용을 다루었다. 이를 위해 기초지반의 강성과 상재하중의 위치를 변화시키며 매개변수 연구를 수행하였으며 해석결과에서는 벽체의 변위와 보강재의 유발인장력은 기초지반의 강성이 감소함에 따라 증가하는 것으로 나타났다. 한편, 해석결과에 따르면 현재 설계기준에서 적용되고 있는 상재하중 처리 방법은 경우에 따라서 상재하중의 영향을 지나치게 과대평가 하는 것으로 나타났으며 상재하중이 보강영역에 근접하여 작용할 경우 외적안정성 검토시 주의를 요하는 것으로 나타났다. 본 논문에서는 본 연구를 통해 얻어진 결과가 실무적 측면에서 의미하는 바를 심도 있게 고찰하였다.

Abstract ▼ AI-Helper

This paper presents the results of investigation on the effects of foundation stiffness and surface loading on the performance of soil-reinforced segmental retaining walls using the finite element method of analysis. A parametric study was performed by varying the foundation stiffness and the locati...

This paper presents the results of investigation on the effects of foundation stiffness and surface loading on the performance of soil-reinforced segmental retaining walls using the finite element method of analysis. A parametric study was performed by varying the foundation stiffness and the location of surface loading. The results of the analyses indicate that the wall deformation and reinforcement tensile load tend to increase with decreasing foundation stiffness with little variation in the horizontal and vertical stress distributions at the back and the base of the reinforced soil zone. Also revealed is that the increment of reinforcement tensile load due to the presence of surface load may be significantly over-estimated when using the conventional approach. Furthermore, the external stability should be carefully examined when a surface loading is present just behind the reinforced soil zone. The implications of the findings from this study to current design approaches are discussed in detail.

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문제 정의

The primary objective of this paper is to provide insight regarding the effects of foundation stiffness and surface loading on the behavior of soilreinforced segmental retaining walls and to form a database for use in developing a more rational design/analysis method. Attention is focused on a segmental block wall reinforced with extensible reinforcement in a granular backfill resting on a foundation with variable stiffness.

가설 설정

In this study, a segmental retaining wall with a height (H) of 8 m resting on a foundation with variable stiffness was considered. The geometry of the wall examined in this study is shown in Figure1 together with the symbols and a set of reference parameters used for the base case.
1. Horizontal deformation behind the reinforcement soil zone significantly increases with decreasing the foundation stiffness, thereby increasing the horizontal deformation at the wall face. Counter measures should be provided to reduce the horizontal deformation behind the reinforced soil zone for such cases.
2. The effect of foundation stiffness on tensile load in reinforcement layers is not as significant and diminishes as the reinforcement density increases. Vertical and horizontal stress distributions at the base and the back of the reinforced soil zone are not significantly affected by the presence of poor foundation conditions.

제안 방법

The results of finite element analysis on the effects of foundation stiffness and the surface loading on the behavior of soil-reinforced segmental retaining walls have been presented. Among the results examined include horizontal deformation, reinforcement tensile load, horizontal and vertical stresses at the back and the base of the reinforced zone. Based on the results of analysis, the following conclusions can be drawn.

이론/모형

A parametric study was performed on the effects of foundation stiffness and surface loading using the finite element method of analysis. In the parametric study, a wide range of boundary conditions was analyzed covering broad foundation and surface loading conditions.
A commercial finite element code DIANA (DIANA, 1996) was used for this study. DIANA is a multipurpose finite element program for use in a range of geotechncial engineering problems including excavation, tunneling, retaining walls and slopes.
The non-linear behavior of the backfill soil was modeled using a Mohr-Coulomb failure criterion and the non-associated flow rule proposed by Davis (1968). The dilatancy angle ( Ψ ) of the soil was related to the internal angle of friction ( φ ), using the relationship proposed by Bolton (1986) with a constant critical state friction angle φ cv=30̊, i.

성능/효과

In summary, the findings in this study suggest that the foundation stiffness has greater impact on the horizontal deformation of the reinforced soil zone than on the internal stability. Of practical significance associated with the foundation stiffness is the construction of tiered wall, which an upper wall is constructed on top of underlying wall.
3. The current design approaches based on the theory of elasticity used to estimate increase in lateral stress caused by surface loads tend to overestimate the magnitude of reinforcement tensile load. The degree of conservatism increases as the location of surface loading moves away from the wall face.
4. Vertical and horizontal stresses at the base and the back of the reinforced soil zone increase with an increase in the distance between the surface loading and the wall, largely due to the increased lateral thrust behind the reinforced soil zone. Both internal and external stability should be checked with great care for walls subjected to surface loading.

후속연구

Comparison between the predicted and the computed based on the Boussinesq solution reveals that the incremental reinforcement tensile load may be significantly over-estimated when adopting the Boussinesq solution. Further investigation is required to develop a generalized method for estimating the increase in reinforcement tensile load cause by surface loading.
When the surface loading is just outside the reinforced soil zone, the predicted σ _{v, max} value slightly exceeds that computed based on the Meyerhof distribution. A further study is required to draw a general conclusion on the appropriateness of the Meyerhof distribution when using for walls subjected to a surface loading behind the wall crest.
5. The findings from this study should be validated against field measurements or large-scale model test results before implementing in the design of soil reinforced segmental retaining walls.

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[국내논문] 기초의 강성과 상재하중이 보강토 옹벽의 거동에 미치는 영향
Effects of Foundation Stiffness and Surface Loading on the Behavior of Soil-reinforced Segmental Retaining Walls 원문보기

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[국내논문] 기초의 강성과 상재하중이 보강토 옹벽의 거동에 미치는 영향 Effects of Foundation Stiffness and Surface Loading on the Behavior of Soil-reinforced Segmental Retaining Walls 원문보기

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[국내논문] 기초의 강성과 상재하중이 보강토 옹벽의 거동에 미치는 영향
Effects of Foundation Stiffness and Surface Loading on the Behavior of Soil-reinforced Segmental Retaining Walls 원문보기

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