• 한국지반환경공학회 논문집
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• 제18권7호
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• pp.13-20
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• 2017

쏘일 네일링은 원지반의 전단강도와 네일의 인발 전단 저항력을 이용한 지반 보강 공법이다. 쏘일 네일링 공법은 주로 절취사면, 흙막이 구조물 및 옹벽 보강 등에 사용된다. 흙막이 구조물과 옹벽의 경우 네일의 인발저항만을 고려하여 설계하여도 무방하나, 비탈면의 경우 인발은 물론 전단 및 휨 저항까지 고려하여 설계하여야 한다. 하지만 인발저항만 고려한 보수적인 설계가 이루어지고 있으며, 대부분이 네일의 재료, 형상, 시공방법 등의 개선을 통한 인발저항 증대에 관한 연구이다. 실제 쏘일네일로 보강된 지반은 활동면을 중심으로 전단 휨 변형이 발생하게 된다. 상대적으로 강도가 취약한 그라우트는 파괴되고 보강재와 분리되어 지반은 마찰저항력이 급감하면서 붕괴된다. 따라서 네일과 그라우트체의 분리를 억제하면서 전단저항력을 증가시킬 수 있는 공법개발이 필요한 실정이다. 본 연구에서는 이형철근 외측에 패커를 설치한 후 가압식 그라우팅을 통해 돌기를 형성함으로써 전단저항력을 증대시킬 수 있는 새로운 쏘일 네일링 공법에 대하여 실험적 연구를 수행하였다.

• 한국지반공학회지:지반
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• 제12권6호
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• pp.101-114
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• 1996

Coulomb토압이론은 실무에서 주로 사용되고 있음에도 불구하고 점성토로 뒤채움된 옹벽에 대한 일반적인 조건에 적용할 수 있는 토압이론식이 존재하지 않는다. 여기서는 점성토로 뒤채움한 중력식 옹벽에 대해서 배수 및 비배수 해석으로 인장균열이 부시된 경우와 고려된 경우에 각각 토압이론식을 유도하였다. 그리고 상기의 조건들에 대해서 전주동토압과 인장균열 깊이를 구하여 설계도표를 작성하였다.

• 한국지반공학회지:지반
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• 제5권3호
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• pp.51-62
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• 1989

보강토옹벽의 원심모형분험의 예비실험으로서 모래와 보강재 사이의 마찰거동의 특성을 조사.연 구하기 위하려 마찰실험을 행하였다. 보강재의 종류 및 길이를 변화시킴으로써 그들이 모래와 보강재 사이의 마찰계수에 미치는 영향을 조사하였다. 한편 다른 두가지 실험방법(직원전단시험과 인발시험)을 택하여 어떤 방법이 실제 현장에서의 보강재의 거동을 잘 나타내는지를 비교.검토하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 토목섬유 학술발표회 논문집
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• pp.157-168
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• 1999

Geosynthetics are commonly used for filtering, layer separations, drainages, cutoffs, and reinforcements. In highway constructions, geotextile mats have been used for the purposes of vehicle trafficability, separations and embankment reinforcements. Geosynthetics are utilized as prefabricated vertical drains and also used as horizontal drainage layers substituted for the sand mat. Geogrids, essential element of reinforced retaining walls, are sometimes spread under the highway pavement. Besides various usage mentioned above, many type of them are also used as drainage of backfill in culverts and bridge abutments. In this paper, problems of specifications and regulations concerning mostly used geotextiles are specifically dealt with from the practical aspects of field engineering and efforts are given upon improvement of them. Especially, relevant sections of "Standard Specifications for the Highway Construction by Korea Highway Corporation"are being revised and these are introduced in detail.

• 한국농공학회지
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• 제39권2호
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• pp.44-50
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• 1997

Permeable polymer concrete can be applied to roads, sidewalks, river embankment, drain pipes, conduits, retaining walls, yards, parking lots, plazas, interlocking blocks, etc.. This study was to explore a possibility of using stone dust and heavy calcium carbonate as fillers for the permeable polymer concrete. Different mixing pro-portions were tried to find an optimum mixing proportion of the permeable polymer concrete. The tests were carried out at 20 f 1 t and 60 ${\pm}$ 2% relative humidity. At 7 days of curing, compressive, flexural and splitting tensile strengths and water permeability ranged between 209~246kgf/cm$^2$, 101 ~ l2lkgf/cm$^2$, 36~52kgf/cm$^2$ and 3.076 ~ 4.390L/cm$^3\;^2$/hr, respectively. It was concluded that the stone dust and heavy calcium carbonate could be used in the permeable polymer concrete.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1995년도 봄 학술발표회 논문집
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• pp.8-13
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• 1995

High strength ready-miced concrete with delivering time of about 90 minutes is successfully produced at ready-mixed concrete plant and placed columns and retaining walls of a tall building without any problems. The design strength of the concrete is 450 kgf/$\textrm{cm}^2$ and the required average compressive strength is 540 kgf/$\textrm{cm}^2$ according to ACI 363R-84 report with assumed coefficient of variation of 12% For the producing of good quality concrete, many laboratary and field tests are carried out. As the results of this study, the slump loss of high strength concrete is largely influenced by kinds of superplasticizer. The measured pump pressure of high strength concrete with slump of 22cm is higher than that of normal strength concrete with slump of 18cm by about 20~30% The measured average 28-day compressive strength of the concrete is 551 kgf/$\textrm{cm}^2$ and the coefficient of variation is 2.3%

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 추계 학술발표회
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• pp.430-433
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• 2006

Damage to earth structures for roads, railways and residential areas, as well as dams and river levees, during the 2004 Niigata-ken Chuetsu earthquake in Japan, and their rehabilitation works are overviewed. Several influential factors are pointed out, such as a) heavy rainfall preceding the earthquake, b) large aftershocks, c) geological conditions for subsoil including existence of liquefiable layers, d) compaction degrees for embankment, and e) drainage capacity from subsoil/embankments. It is also reported that, in the reconstruction works of damaged roads and railways, preferred use of geogrid-reinforced soil retaining walls was implemented.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.330-335
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• 2005

Reliable predictions of the movement of earth retaining structures and the ground adjacent to braced walls in urban excavation are often difficult due to many variable factors. The ground settlement and the damage of adjacent structures in urban excavation has been an important issue. Therefore, the stability of the adjacent structures must be secured with the excavation support and research on the protection of adjacent structure is necessary. This study showed a countermeasure method for case of damage behavior in urban excavation.

• 한국농공학회논문집
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• 제48권7호
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• pp.25-31
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• 2006

Permeable polymer concretes can be applied to roads, sidewalks, river embankment, drain pipes, conduits, retaining walls, yards, parking lots, plazas, interlocking blocks, etc. This study was to explore a possibility of using bottom ash as filler and recycled coarse aggregate of industrial by-products for permeable polymer concrete. The tests carried out at $20{\pm}1^{\circ}C$ and $60{\pm}2%$ relative humidity. At 7 days of curing, unit weight, void ratio, compressive and flexural strength and coefficient of permeability ranged between $1,652{\sim}1,828kgf/m^{3},\;15{\sim}29+%,\;18.2{\sim}24.5\;MPa,\;6.4{\sim}8.4\;MPa\;and\;6.8{\times}10^{-2}{\sim}1.7{\times}10^{-1}\;cm/s$, respectively. It was concluded that the bottom ash and recycled coarse .aggregate can be used in the permeable polymer concrete.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 토목섬유 특별세미나
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• pp.73-78
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• 2000

The reinforced soil has been widely used for constructing retaining walls and embankment with steep slope. However, the benefits of soil reinforcing are often-restricted by a lack of good quality backfill material. In this study, plane strain compression tests were carried out to study the effects of preloading on the behavior of geosynthetic-reinforced saturated clay. For the unreinforced and reinforced soil, drained and undrained shearing tests were peformed after anisotropic consolidation in a constant strain rate. A preoading test was carried out by preloading, creep, unloading, aging and undrained shearing after anisotropic consolidation(K=0.3, σ'₃=50 kPa). It was observed that a reinforced clay, Kanto loam, can have a great initial secant modulus in undraind condition by well compaction and over consolidation. The results shown that the increasing of drained strength should be used to apply a large preloading in the case of reinforced clay.