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한국지반공학회 추계 학술대회

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수록정보
수록범위 : 1999권0호(1999)~2010권0호(2010) |수록논문 수 : 638
한국지반공학회 추계 학술대회
2010권0호(2010년 09월) 수록논문
최근 권호 논문
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1Bearing capacity of shallow footing under combined loading

저자 : Osamu Kusakabe , Tomohide Takeyama

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 3-25 (23 pages)

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The paper deals with two bearing capacity problems of shallow footing under combined loading. The first is a FEM study of shallow strip footing on two-layer clay deposits subjected to a vertical, horizontal and moment combined loading, while the second is a centrifuge study of shallow rectangular footing on dry sand under double eccentricity. The FEM results revealed that the existence of top soft layer sensitively affects more on horizontal and moment capacity than vertical capacity for cases of footing on soft clay overlying stiff clay. Practical design charts are presented to evaluate bearing capacities of footing for various combinations of the ratio of the depth of the upper layer to the footing width and the ratio of undrained strength of the upper layer to that of the lower. The centrifuge tests indicated that current design practice of calculating failure load of rectangular surface footing under double eccentricity underestimates the centrifuge loading test data. This trend is more marked when the eccentricity becomes larger. The decreasing trend in failure load with an increase of double eccentricity is rather uniquely expressed by a single curve, using a newly defined resultant eccentricity and the diagonal length of the footing base.

2그라우팅을 통한 방조제 바닥보호공 차수공법 현장 적용성 검증

저자 : 이소열 ( So Yeal Lee ) , 최세경 ( Sae Kyung Choi ) , 정일한 ( Il Han Jeong )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 29-39 (11 pages)

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By understanding the construction process of sea dikes and the current state of the thickness and speed of fluid in the bottom layer protection work of final closure gaps, a construction method applicable for the blocking of bottom layer work will be selected. The three construction methods selected will be tested in site through various methods, and the reinforcement of bottom layer protection and impervious effect will be verified. The verification results are as follows: 1) The overall riprap layer were 0.5~1.0m thicker than planned so that the grouting depth and grout input amount increased 2) The applied construction methods permeability of riprap layers were improved from α×10-2 cm/s before the construction to α×10-4cm/s after construction. 3) The results of core extraction in order to grossly verify the hardening time and durability allowed the identification of grout injection effect. The amount of filling of the injection was difficult to judge because the slime in many areas made the reading of borehole photography difficult.

3새만금 간척지 토양특성과 친환경 활용 방안

저자 : 서동욱 ( Dong Uk Seo ) , 전건영 ( Geon Yeong Jeon ) , 김현태 ( Hyun Tae Kim ) , 송재도 ( Jae Do Song )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 40-48 (9 pages)

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Saemangeum reclaimed area is needed to construct much green zone to make high-quality multi-functional land such as tide embankment, lake dike, industrial complex, environmental spaces, etc. However, growth of plants is somewhat difficult because a salinity of Saemangeum soil is very high and a soil fertility, water content of soil are low. Therefore, it is essential to initial desalination of soil and continuous management for planting base. It is recommended that a group of grassland to raise the efficiency of covering should be made in the first stage and a forest by improvement of vegetation should be made in the mid and long term stage. It is recommended that the construction of vegetation base should be made with a regular thickness of soil of good quality in multi-functional area such as a shrub and wood. In case of construction of a windbreak forest, it is necessary to make a wood base of suitable depth using soil brought from another place or filling of soil. Also, it is necessary to keep a maintenance of woods in early stage. Saemangeum reclaimed land will be brand-named worldwide tourist attractions due to construction of much green zone having high quality multi-functional facilities.

4새만금지역에서 GIS를 이용한 광역액상화 판정

저자 : 송병웅 ( Byung Woong Song ) , 김건호 ( Gun Ho Kim ) , 유진호 ( Jin Ho Yoo ) , 김홍택 ( Hong Taek Kim )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 49-59 (11 pages)

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Earthquake-induced liquefaction on saturated loose sand is well known in the world. Since Saemangeum Dike Project has a plan to be reclaimed with dredged sand on wide river, possibility of liquefaction should be checked. Section Dongjin5 was selected to evaluate possibility of liquefaction. Estimating method follows as 1) determination of PL value with SPT results, passing curve, and soil properties, 2) prediction for maximum earthquake acceleration, 3) calculation for FL value on depth with Korean specification for highway bridges, 4) visualization for possibility of liquefaction on all of project area with GIS 5) comparison with Japanese specification for highway bridges, Youd and Idriss method, and Andrus and Stokoe II method for verification, 6) ascertainment for the potential liquefaction with cyclic triaxial test. 7) establishing for countermeasure if needed. From the results, even though most of area covered with sand, no potential liquefaction exists except some areas. Those need to soil improvement with grout or attaching measurement on substructure.

5수두손실률에 의한 방조제 침투류 감시기법 개발

저자 : 임성훈 ( Sung Hoon Eam ) , 윤창진 ( Chang Jin Yoon ) , 김성필 ( Seong Pil Kim ) , 허준 ( Jun Heo ) , 강병윤 ( Byung Yoon Kang )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 60-68 (9 pages)

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In this study, the seepage flow monitoring method by hydaulic head loss rate graph was developed for the purpose of monitoring the seepage flow from the see side or from the lake on sea dike in which seepage force was varied periodically. The hydraulic head loss rate was defined in this method. The value of the rate is in the range from 0 to 1. the value of 0 means perfectly free flow of seepage. the value of 1 means perfect waterproofing. The value of coefficient of determination in the hydraulic head loss rate graph closer to 1 means that the seepage flow way is stable. The value of coefficient of determination in the hydraulic head loss rate graph closer to 0 means that the hole may exist or the piping may be in the progress. The pore water pressure data measured in Saemangeum sea dike was analyzed with the developed method The result showed that the variation of seepage flow state was detected sensitively by this method and the interception effect of sea dike could be estimated quantitatively.

6강우침투시 불포화 무한사면의 안정성 평가

저자 : 송영석 ( Young Suk Song ) , 황웅기 ( Woong Ki Hwang ) , 이남우 ( Nam Woo Lee ) , 김태형 ( Tae Hyung Kim )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 71-78 (8 pages)

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The stability analysis of unsaturated infinite slope under rainfall-induced infiltration condition was performed using the generalized effective stress that unifies both saturated and unsaturated condition recently proposed by Lu and Likos(2004, 2006). The Soil-Water Characteristic Curve (SWCC) of the sand with the relative density of 75% was first measured for both drying and wetting processes. The Hydraulic Conductivity Function (HCF) and Suction Stress Characteristic Curve (SSCC) were subsequently estimated. Also, under the rainfall-induced infiltration condition transient seepage analysis of unsaturated infinite slope was performed using the finite element program, SEEP/W. Based on these results, the stability of unsaturated infinite slope under rainfall-induced infiltration condition was examined considering the suction stress. According to the results, the negative pore water pressure and water content within the soil changed with time due to the infiltration. Also, the variation of those caused the variation of suction stress and then the factor of safety of slope changed consequently during the rainfall period.

7TDR센서를 이용한 사면거동 해석

저자 : 박민철 ( Min Cheol Park ) , 이재호 ( Jae Ho Lee ) , 한희수 ( Heui Soo Han )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 79-86 (8 pages)

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In this paper, using soil slope inclinometer observations of lateral flow is used as a traditional way, but there are some decisions. Inclinometers in the process of installing and monitoring is costly. Severe incline slope of the lateral flow is observed in the inefficient. As a solution for it using TDR sensors are used to. Metal conductors such as coaxial cable and general cable uses a measurement sensor can be installed on site at a lower cost and slope measurements are available for long-term monitoring. When TDR sensor is installed on the slopes, changes in the behavior of slopes causes the earth pressure. TDR sensors determine the change of earth pressure and tried to analyze the behavior of slopes.

8영구앵커와 연직 프리캐스트패널을 사용한 절토사면 친환경옹벽공법의 적용사례

저자 : 남홍기 ( Hong Ki Nam ) , 정홍섭 ( Hong Seop Jung )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 87-96 (10 pages)

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PAP method is a combined measures which consist a anchored retaining wall method with permanent ground anchors and vertical precast concrete panels, step by step on the slope surface. And soil is back filled between slope and vertical precast panels. Therefore, this method is more effective than any other ground anchor reinforcing methods of slope stability, for example cross type concrete block ground anchor or buttress concrete block ground anchor method. Because of increasing effective anchor force and green tree planting.

9압력식 쏘일네일링을 적용한 사면 및 흙막이 벽체 설계/시공 사례

저자 : 정경한 ( Kyung Han Jung ) , 김준엽 ( Jun Youp Kim ) , 이승재 ( Seung Jai Lee )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 97-108 (12 pages)

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발포우레탄 패커를 이용한 압력식 쏘일네일링 공법은 기존 쏘일네일링 공법의 단점을 보완하기 위하여 개발되었으며, 그라우팅 두부에 패커를 설치하여 네일 정착부를 완전히 밀폐하고 압력 그라우팅을 실시하여 정착부의 유효직경 및 인발저항력을 증가시켜 안전율을 향상시키는 공법이다. 압력식 쏘일네일링 공법에 대한 효용성을 검증하기 위하여 발포우레탄 패커 특성시험 및 현장조건을 묘사한 실내 그라우팅 주입실험, 현장시험 및 FEM해석을 수행하였다. 본 공법의 필수요소인 발포우레탄 패커의 정착력 확인을 위한 패커 특성시험 결과, 공내에 작용하는 압력에 대하여 패커가 충분히 저항함을 알 수 있었으며, 인발저항력 증가 원인 분석을 위한 실내 및 현장 시험결과, 압력 그라우트에 의하여 그라우트의 품질확보, 보강력증가 및 주변지반의 압밀효과를 확인 하였다. 끝으로 압력식 쏘일네일링 공법을 적용한 사면 및 흙막이 벽체 설계/시공 사례를 분석하여 현장 적용시 본 공법의 효용성 및 대처능력의 우수함을 입증하였다.

10멀티패커를 이용한 동시다단주입 MPS 사면보강공법

저자 : 우상백 ( Sang Back Woo ) , 정희석 ( Hee Seok Jung ) , 이재덕 ( Jae Dug Lee )

발행기관 : 한국지반공학회 간행물 : 한국지반공학회 추계 학술대회 2010권 0호 발행 연도 : 2010 페이지 : pp. 109-116 (8 pages)

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일반적으로 사용되는 비탈면 보강공법은 중력식 혹은 가압식 네일링, 앵커 등이 있다. 이들 공법은 주입재 주입압력이 중력식무압 혹은 낮은 압력의 가압에 의한 것으로서, 실제로 단층파쇄대, 붕적층, 이완 및 절리 등이 발달한 지반에서는 일정압력의 가압주입에 의한 지반보강과 보강재에 의한 네일링 효과를 동시에 기대해야 한다. 본 사례에서는 가압주입의 효과를 높이기 위해 보강구간을 일정한 간격으로 나누고 구간별 별도의 주입펌프를 연결하여 보강길이 전구간을 동시에 주입하는 멀티패커시스템(MPS)공법을 소개하고자 한다.

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