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Tatsuoka F 한국토목섬유학회 2006 한국토목섬유학회 학술발표회 Vol.2006 No.12
The advantages of geosynthetic-reinforcing technology to construct new soil structures including; a) a relatively short construction period; b) small construction machines necessary; and c) a higher stability of completed structures, all contributing to a higher cost-effectiveness, are addressed. Several typical cases in which embankments having a gentle slope and conventional type soil retaining walls that were seriously damaged or failed were reconstructed to geosynthetic-reinforced steepened slopes or geosynthetic-reinforced soil retaining walls are reported. It is shown that the reconstruction of damaged or failed conventional soil structures to geosynthetic-reinforced soil structures is also highly cost-effective. Rehabilitation of an old earth-fill dam in Tokyo to increase its seismic stability by constructing a counter-balance fill reinforced with geosynthetic reinforcement is described.
Geosynthetic-Reinforced Soil Structures to Mitigate Natural Disasters
F. Tatsuoka,M. Tateyama,J. Koseki 한국토목섬유학회 2011 한국토목섬유학회 학술발표회 Vol.2011 No.11
The total length of permanent geosynthetic-reinforced soil (GRS) retaining walls (RWs) with staged-constructed full-height rigid (FHR) facing for railways, including high-speed train lines, highways and so on is now more than 125 km in Japan. Many were also constructed replacing conventional type RWs and embankments that collapsed during recent earthquakes, heavy rains, floodings and storms. It is proposed to construct GRS coastal dikes with FHR facing connected to geosynthetic reinforcement layers as a tsunami barrier. Based on the GRS RW technology, a number of bridge abutments with geosynthetic-reinforced backfill were constructed. The latest version, called the GRS integrated bridge, comprises a continuous girder integrated to a pair of RC facing, not using bearings, and the \backfill reinforced with geosynthetic reinforcement layers firmly connected to the facing. The advantageous features of this new bridge system are summarized. It is proposed to apply this new bridge system to replace conventional type bridges that collapsed by earthquakes, flooding and tsunami and also to newly construct those having high resistance against these natural disasters.
노한성,Tatsuoka, Fumio 한국지반공학회 2000 한국지반공학회논문집 Vol.16 No.5
배수성과 인장강성을 가지는 복합 보강재를 사용하여 보강한 포화점성토의 거동에 선행하중이 미치는 영향을 조사하기위하여 평면변형을 시험을 수행하였다. 보강하지 않은 공시체와 보강한 공시체에 대하여 이방압밀(K=0.3, σ3'=50kPa)을 실시하고 비배수 및 배수전단시험을 일정변형율 속도를 실시하였다. 선행하중을 가한 시험의 경우는 이방압밀후 소정의 선행하중을 가하여 크리이프, 제하, 에이징 후에 비배수 전단시험을 실시하였다. 시험결과 분석한 결과 포화전성성토와 같이 연약한 토질이라도 다짐을 잘하고 보강토의 큰 배수압툭강도를 이용하여 큰 배수압축강도를 이용하여 큰 선행하중을 가하여 과압밀 상태로 함으로써 비배수 전단시에 큰 초기강성을 가지는 것을 알수 있었다. 즉, 점성토의 보강토의 경우 보강에 의한 배수강도의 증가는 큰 선행하중을 가하기 위하여 사용하는 것이 가장 효율적인 것으로 판단된다.