• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1666-1672
• /
• 2008

In this study, it collected and analyzed a construction case of the improved top-down support system application field on a case by case retaining wall method. The behavior of horizontal displacement was analyzed according to retaining wall type after reviewing a design stage and estimated horizontal displacement under the construction. The study results showed that it is judged stable until excavation termination irrelevant to a retaining wall method at the improved top-down support system application. It is judged that the settlement of behind ground can minimize because the retaining wall head displacement also behave stably. It was compared the predicted horizontal displacement in design and the measured horizontal displacement acquired through a measurement by using Elasto-Plastic analysis program. The comparison results showed that a similar horizontal displacement was predicted within stability standard irrelevant to a retaining wall method. So, it is decided that the advanced prediction is reasonable by Elasto-Plastic analysis in design applied the improved top-down support system. In the case of the ground anchor method application under a same condition, it is decided that a horizontal displacement will more increase than the improved top-down support system is applied. If a section condition is same, it was decided that to apply top-down support system is more stable than that.

• 지질공학
• /
• 제15권2호
• /
• pp.155-168
• /
• 2005

절개사면에 설치 된 흙막이벽의 거동은 도심지 굴착공사에 적용된 흙막이벽의 거동과 다르다. 배면경사지 설치된 흙막이벽 설계법을 확립하기 위하여는 흙막이벽 및 배면지반의 변형거동을 상세히 규명할 필요가 있다. 따라서, 본 연구에서는 아파트 신축부지 절개사면의 보강을 위하여 앵커지지 흙막이벽과 억지말뚝이 설치된 사면을 대상으로 현장계측을 수행하였다. 계측결과 굴착초기 흙막이벽의 변형은 배면경사지반의 변형보다 크게 발생되지만, 굴착깊이가 깊어짐에 따라 배면경사지반의 변형이 크게 발생됨을 알 수 있다. 이러한 이유는 굴착초기에 흙막이벽의 변형이 흙막이 말뚝의 강성과 앵커인장력에 의하여 억제되었기 때문으로 판단된다. 앵커에 도입된 선행인장력은 흙막이벽의 거동에만 큰 영향을 미치며, 강우로 인한 흙막이벽의 변형은 지하수위의 변화보다 지표면 부근에서의 침투수에 의해 영향을 받는다 한편, 굴착배면의 경사진 사면에 설치된 앵커지지 흙막이벽의 수평변위는 굴착배면지 반이 수평인 흙막이벽의 수평변위 보다 2-6배정도 크게 발생하였다.

• 지질공학
• /
• 제19권4호
• /
• pp.475-482
• /
• 2009

절토사면에 설치된 흙막이벽의 거동은 도심지 굴착공사에 적용된 흙막이벽의 거동과는 다를 것이다. 배면경사지에 설치된 흙막이벽 설계법을 확립하기 위하여는 흙막이벽 및 배면지반의 변형거동을 상세히 규명할 필요가 있다. 따라서, 본 연구에서는 아파트 신축부지 절개사면의 보강을 위하여 앵커지지 흙막이벽과 억지말뚝이 설치된 사면을 대상으로 계측을 수행하였다. 계측결과 굴착초기에는 흙막이벽의 변형이 배면경사지반의 변형보다는 크게 발생되나, 굴착깊이가 깊어짐에 따라 배면경사지반의 변형이 크게 발생되었다. 이는 굴착으로 인한 흙막이벽의 변형이 흙막이말뚝의 강성과 앵커인장력에 의하여 억제되었기 때문으로 판단된다. 앵커에 도입된 선행인장력은 흙막이벽의 거동에만 큰 영향을 미치며, 강우로 인한 흙막이벽의 변형은 지하수위의 변화보다 지표부근에서 침투된 침투수의 영향이 큰 것으로 나타났다. 한편, 굴착배면의 경사진 사면에 설치된 앵커지지 흙막이벽의 수평변위는 굴착배면지반이 수평인 흙막이 굴착의 경우 보다 2~6배 정도 크게 발생하였다.

• Earthquakes and Structures
• /
• 제24권3호
• /
• pp.205-215
• /
• 2023

Currently, many studies are underway at home and abroad on the seismic performance evaluation and dry construction method of the masonry structure. In this study, a dry stack masonry wall system without mortar using concrete blocks is proposed, and investigate the seismic performance of dry filling wall frames through experimental studies. First, two types of standard blocks and key blocks were designed to assemble dry walls of concrete blocks. And then, three types of experiments were manufactured, including pure frame, 1/2 height filling wall frame, and full height filling wall frame, and cyclic load experiments in horizontal direction were performed to analyze crack patterns, load displacement history, rebar deformation yield, effective stiffness change, displacement ductility, and energy dissipation capacity. According to the experimental results, the full height filling wall frame had the largest horizontal resistance against the earthquake load and showed a high energy dissipation capacity. However, the 1/2 height filling wall frame requires attention because the filling wall constrains the effective span of the column, limiting the horizontal displacement of the frame. In addition, the concrete block was firmly assembled in the vertical direction of the wall as the horizontal movement between the concrete blocks was allowed within installation margin, and there was no dropping of the assembled concrete block.

• 한국재난정보학회 논문집
• /
• 제4권2호
• /
• pp.10-27
• /
• 2008

When the ground is excavated adjacent to the existing tunnel, which is loaded by the surcharge on the ground surface, the tunnel stability would be very sensitive to the deformation of the ground induced by the horizontal displacement of braced wall. The stability of the existing surcharged tunnel could be controlled by pre-loading on the braced wall. In this paper, it was investigated, if it would be possible to keep the existing surcharged tunnel stable by preventing the horizontal displacement of a braced wall by imposing the pre-loading during the ground excavation. For this purpose, large scale model tests were performed in a scale 1/10 at the test pit which was 2.0m in width and 6.0m in height and 4.0m in length. Isotropic test ground was constructed homogeneously by wet sand. Model tunnel was constructed in the test ground. Surcharge was loaded on the ground surface above the tunnel. During the tests, the behavior of model tunnel and model braced wall was measured. Numerical analyses were also performed in the same condition as the tests. And their results were compared to that of the model tests. Consequently, the effect of a surcharge could be compensated by imposing the pre-loading on the braced wall. The existing tunnel and the braced wall could be kept stable by preventing the horizontal displacement of the braced wall through pre-loading, although the tunnel is surcharged.

• Earthquakes and Structures
• /
• 제14권2호
• /
• pp.179-186
• /
• 2018

We present the accurate investigation the seismic behavior of the gravity retaining wall built near rock face based on numerical method. The retaining wall is a useful structure in geotechnical engineering, where the earthquake is a common phenomenon; therefore, the evaluation of the behavior of the retaining wall during an earthquake is essential. However, in all previous studies, the backfill behind the wall was usually approximated by a homogeneous region, while in contrast, in practice, in many cases retaining walls are used to support the soil pressure in, inhomogeneous, mountainous area. This suggests an accurate investigation of the problem, i.e., numerical analysis. The numerical results will be compared with some of recently proposed analytical methods to show the accuracy of the proposed method. We show that increasing the volume of the rock face yields decreasing the permanent horizontal displacement of the gravity retaining wall built near rock face. Besides, we see that the permanent horizontal displacement of the gravity retaining wall with homogenous backfill is more than permanent horizontal displacement of the gravity retaining wall case of the built near rock face in different frequency contents.

• 한국지반신소재학회논문집
• /
• 제22권2호
• /
• pp.85-92
• /
• 2023

본 연구에서는 제주 지역에서 어스앵커로 지지된 흙막이벽의 측방토압 적용을 평가하기 위하여, 2개의 현장 시공 사례를 기반으로 수평변위에 대한 계측값과 예측값을 비교하였다. 흙막이벽에 작용하는 측방토압의 예측은 Rankine 토압, Hong & Yun 측방토압, Terzaghi & Peck 수정측방토압, Tschebotarioff 측방토압을 이용하여 탄소성해석을 실시하였다. 그 결과, A현장에 대한 최대 수평변위의 예측값은 계측값에 비하여 약 10배~12배로 화인되었으며, B현장의 경우에는 예측값이 계측값보다 약 9배~12배로 평가되었다. 즉, 2개 현장 모두 계측값에 비해 예측값에 의한 최대 수평변위가 유사한 증가율을 보였다. 모든 현장 사례에서 계측값에 의한 최대 수평변위는 퇴적층, 연암층 및 클링커층에서 발생하였고, 수평변위 형상은 사다리꼴 형태에 나타냈다. 그리고 예측값에 의한 최대 수평변위는 클링커층 주변에서 발생하였으며, 수평변위 형상은 타원형으로 나타났다. 클링커층이 혼재되어 있는 지반에서 계측값이 예측값과 매우 다른 수평변위 경향을 보이는 원인으로는 클링커층이 암반층과 연속된 지층의 형태로 존재하기 때문으로 판단되었다. 즉, 예측되는 토압 분포와 상당히 다른 경향을 보이는 제주 지역의 토압 분포 특성을 고려하면 과다하게 평가되는 기존의 예측방법을 적용하는 것은 다소 무리가 있을 것으로 판단되기 때문에, 보다 경제성을 확보할 수 있는 현실적인 제주 지역의 측방토압에 관한 연구가 수행될 필요가 있다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2005년도 춘계 학술발표회 논문집
• /
• pp.1448-1454
• /
• 2005

Horizontal displacement of slurry wall with strut is analyzed using 2-D numerical stress-displacement program, FLAC. Validation of the program results are performed using the pre- and ongoing excavation sections and further displacement is predicted in the stage of strut removal. The result show that the calculated displacement was very close to the measured displacement when 40% in-situ strut preloading is applied to the strut loading of the program considering the horizontal spacing of struts in the field. It was found that construction efficiency can be improved by partially removing the struts before putting slabs in the stage of subway structure construction.

• 한국지반환경공학회 논문집
• /
• 제13권5호
• /
• pp.25-33
• /
• 2012

본 연구에서는 흙막이 가시설 공법중 지반의 변위를 억제하고, 토공사 및 구조물 공사의 시공성을 크게 개선한 IPS 흙막이 가시설 공법을 시공한 현장의 계측자료를 바탕으로, 탄소성보법 수치해석 프로그램(EXCAV/W)을 이용하여 수치해석을 실시하였다. 그 결과, 선행하중을 가한 해석치가 평균 13.2% 감소하였으며, 또한 일반적인 해석치보다 현장 계측치는 평균 26.7% 감소하는 것으로 나타났다. 따라서 IPS 흙막이 가시설 공법은 기존 버팀보 공법에 흙막이벽의 수평변위에 대한 안전성을 확보하고 있음을 알 수 있다. 또한 IPS 흙막이 가시설 공법을 이용한 선행하중 효과를 통해 수평변위가 감소하는 것을 확인할 수 있다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2014년도 추계 학술논문 발표대회
• /
• pp.184-185
• /
• 2014

The purpose of this study is to experimentally evaluate the variation characteristics of stiffness and impact resistance under the construction height of gypsum board wall at the actual construction site. The method suggested in previous study was applied on the test method of horizontal load resistance and impact resistance. As a result of horizontal load resistance test, when the wall height is 2,400 mm, the maximum displacement is 13.6 mm and residual deformation is 0.5 mm, and when the wall height is 3,000 mm, the maximum displacement is 31.3 mm and the residual displacement is 6.8 mm. As a result of impact resistance test, the residual deformation of each specimen at 20 cm of fall height were 1.02 mm and 0.08 mm, respectively, the residual deformation at 40 cm of fall height were 1.58 mm and 0.35 mm, respectively, and the residual deformation at 60 cm of fall height were 2.23 mm and 2.48 mm, respectively.