[논문]다단식 보강토 옹벽의 설계 - 사례연구 및 시험시공

유충식; 정혁상

다단식 보강토 옹벽의 설계 - 사례연구 및 시험시공
Geosynthetic-Reinforced Segmental Retaining Walls in Tiered Arrangement - Case Study and Field Trial Wall Instrumentation 원문보기

본 논문에서는 다단식보강토옹벽의 해석과 시험 시공을 통해 안정성을 검토한 내용을 다루었다. 한계평형에 근간을 둔 현행의 설계기준에 근거하여 설계된 각기 다른 네 개의 현장 옹벽에 대해 내 외적 안정성 대한 안정성 검토를 실시하였으며, 국외 보강토옹벽의 설계법인 FHWA 및 NCMA의 설계에 의거한 다단식보강토옹벽의 시험시공을 통해 상 하단 옹벽의 상호작용에 의한 거동에 대해 분석을 실시하였다. 본 논문에서는 연구결과를 토대로 다단식보강토옹벽의 역학적 거동을 이해하고, 설계 및 시공의 주안점을 언급하였다.

This paper presents the results of stability analyses on soil-reinforced segmental retaining walls in a tiered arrangement. Four different walls were examined to investigate the appropriateness of their designs within the context of the current design guidelines based on limit equilibrium. Slope stability analysis against the compound failure mode, which is frequently ignored during design, was also performed based on the method recommended by FHWA design guidelines. Also presented are the results of instrumentation on a full-scale field trial wall constructed as part of this study. The implications of the findings from this study are discussed.

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문제 정의

6-m high full-scale SRW was constructed and instrumented with the aim of investigating the behavior of a tiered SRW at a full-scale level. This paper describes a review of design practice concerning this type of SRW systems, construction and instrumentation of the full-scale test wall, details of the observed performance, and finally design implication.

가설 설정

5) For Wall D. FHWA design guideline assumes no interaction.

제안 방법

This paper presents the performance of a geosynthetic-reinforced segmental retaining wall in a tiered arrangement. For the purpose of identifying fundamental principles involved in the mechanical behavior of SRWs in a tiered arrangement and to form a database for use in the improvement of the current design approaches, a 5.6-m-high full-scale field wall was constructed and instrumented.
In this study, a 5.6-m high full-scale SRW was constructed and instrumented with the aim of investigating the behavior of a tiered SRW at a full-scale level. This paper describes a review of design practice concerning this type of SRW systems, construction and instrumentation of the full-scale test wall, details of the observed performance, and finally design implication.
Table 3 gives the details of types and locations of the instruments. Measurements were collected during construction over a two-week period of June 25, July 7, 2002, and continued for more than six month after the wall completion.
The monitoring program was focused more on displacement measurements. Monitored items included horizontal deformation at the wall face and strains in the reinforcement.
It should be noted that an internal friction angle of =30 and a unit weight of =18 kN/m³ were used for the backfill soils as used in their original designs. This is justified since the purpose of the comparisons was not to examine the performance of the walls but to demonstrate the differences between the two design approaches.

대상 데이터

The full-scale field test wall was constructed at the Geotechnical Experimentation Site (GES) in Sungkyunkwan University in Korea. The ground at the site consists of approximately 3.
The full-scale field test wall was constructed at the Geotechnical Experimentation Site (GES) in Sungkyunkwan University in Korea. The ground at the site consists of approximately 3.0 m of miscellaneous fill material including sand and gravel. Underlying the fill layer is a 3.
The wall was constructed using modular blocks (450～330 mm in plan 200 mm in height) having a compressive strength of 21 MPa with a maximum water absorption of 68% for standard weight aggregates. Shear keys are formed on each block to transfer shear between two blocks.

성능/효과

Weathered granite soil available near the GES was used as the backfill material. Laboratory tests performed on the backfill material revealed that the percents passing the No. 4 and No. 200 sieves were approximately 93% and 9%, respectively, with the coefficients of uniformity and curvature of Cu=12 and Cc=1.4. Based on the Unified Soil Classification System (USCS) the soil was classified as SW-SM.
The results indicated that the interaction between the upper and the lower tiers significantly increases not only the horizontal deformation of the lower tier but also that of the upper tier. Also measured was significant horizontal wall movement at the wall base due in large part to the relatively compressible nature of the foundation despite the foundation improvement effort.
A similar trend is observed for the overturning. The results of the internal stability calculations also show that the FHWA design approach gives larger maximum reinforcement forces than the NCMA design approach. In addition the FHWA design approach tends to yield larger embedment lengths beyond active failure surfaces than the NCMA design approach, which in turn result in larger pullout capacities.

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다단식 보강토 옹벽의 설계 - 사례연구 및 시험시공
Geosynthetic-Reinforced Segmental Retaining Walls in Tiered Arrangement - Case Study and Field Trial Wall Instrumentation 원문보기

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다단식 보강토 옹벽의 설계 - 사례연구 및 시험시공 Geosynthetic-Reinforced Segmental Retaining Walls in Tiered Arrangement - Case Study and Field Trial Wall Instrumentation 원문보기

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다단식 보강토 옹벽의 설계 - 사례연구 및 시험시공
Geosynthetic-Reinforced Segmental Retaining Walls in Tiered Arrangement - Case Study and Field Trial Wall Instrumentation 원문보기

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