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Group Effects in Pile Group under Lateral Loading
안광국,김홍택,Ahn Kwang Kuk,Kim Hong Taek Korean Geotechnical Society 2005 한국지반공학회논문집 Vol.21 No.2
본 연구에서는 점토지반에서 수평력을 받는 군말뚝과 단말뚝의 수평저항력을 파악하기 위하여 유한요소 해석프로그램인 ABAQUS를 이용하여 수치해석을 행하였다. 수치해석은 말뚝직경(1.0, 0.5m), 말뚝길이(7, 10m) 그리고 두부조건(두부자유와 말뚝캡을 적용한 두부구속조건)을 변수로 하여 실시하였다. 수평력 작용시 선말뚝(leading pile)의 캡에 의한 영향과,군말뚝내의 각각의 말뚝에 대한수평저항력의 크기와 분포를 평가하기 위하여 1$\times$3 군말뚝을 사용하였다. 점토지반은 Cam-clay 모델을 사용하였고, 말뚝은 원형의 콘크러트로 탄성모델을 사용하여 3차원 해석을 수행하였다. 해석결과 말뚝캡의 크기는 단말뚝의 수평저항력에 영향을 미치는 것으로 나타났으며, 군말뚝내의 선말뚝은 군말뚝의 효과에 의해 수평저항력이 증가하면서 Brown이 제안한p-multiplier 값이 1보다 크게 평가되었다. This paper describes the results for a numerical analysis of'single piles and pile oops in clayey soils subjected to monotonous lateral loading using the ABAQUS finite element software. The investigated variables in this study include free head and embedded capped single piles, pile diameter (1.0 m, 0.5 m), pile length (7.0 m, 10.0 m), and pile groups. The 1$\times$3 pile group was selected to investigate the individual pile and group lateral resistance, the distribution of the resistance among the piles, the effects of lateral stresses in front of and on the sides of the piles, and the effect of a cap on the lateral resistance of the leading pile. The soil was modeled using Cam-clay constitutive relationship and the pile was considered as a elastic circular concrete pile. The results show that the size of the cap influences lateral capacity of sin pile. The results also show in pile groups, the pile-soil-pile interaction and the cap effect the resistance in the leading pile, and the p-multiplier for the leading pile of greater than 1.0 was able to be obtained.
블록식 보강토 옹벽의 근입 깊이에 따른 안정성 및 경제성 평가
안광국 ( Kwang Kuk Ahn ),강희상 ( Hee Sang Kang ) 충북대학교 건설기술연구소 2011 建設技術論文集 Vol.30 No.1
Lots of modular block wall, which is beneficial for the construction of road, railway and apartment building, have been constructed in order to efficiently turn to practical use of the land. Inserting reinforce material, which has big amount of tensile force such as Geotextile, in the backfill of general retaining wall was used for the construction method of modular block wall. Even though there were lots of standards regarding the design and construction of modular block wall in both Korea and abroad, building modular block wall has been in utter confusion because the details of the standard for the modular block wall was not prescribed well. For those reasons that I have mentioned in this study, the basic data were obtained for the efficiency of construction material management and improvement through the research regarding the foundation of modular block wall in the inserting part of reinforce material. The cost of construction increased and decreased in accordance to the depths of reinforce material insertion
안광국 ( Kwang Kuk Ahn ),박수범 ( Su Beom Park ),임관섭 ( Gwan Seop Lim ) 충북대학교 건설기술연구소 2012 建設技術論文集 Vol.31 No.2
In this study, the effect of electrolyte concentration was examined to observe the applicability of e1ectroosmosis on soft soil with various concentration of pH. These tests were performed on the ground formed by aqueous with acid(pH6~7), neutral(pH7 ~8) and alkali(pH8~g). In addition, a supply voltage by 10V/m used in c1ecLnx.lsmosis test was constantly supplied and the test was performed by using PBD covered with nano-gcosynthctics, metallic electrodes steel bars and aluminum bars and then tests of settlement, water content, content water, shear strength were compare and analyzed respectively. As a results of electroosmosis test about pH change and type of electrods, the effect of soil improvement was increased by changing pH from alkaline to acidic and it of nano-geosynthetics as electro was higher than metallic electrodes.