A Study on the Design Method of the Reinforced Earth Structures Considering Compaction Induced Stresses

다짐 유발응력을 고려한 보강토 설계방법에 관한 연구

The main purpose of this the sutdy is to develop the reinforced earth structure design method considering induced stresses and deflections resulting from placement and compaction of soil. In this paper, the new reinforcement Geolog developed by the author is also introduced which is being used as one of the effective earth reinforcing structure against compaction induced stresses. This study adopted the Seed's bilinear model in the estimation of the com paction induced stresses and compute the peak lateral stresses during compaction by doubled Boussinessq's elastic solution of mirror image theory, thereafter, calculate the residual compaction induced lateral stresses from the above peak lateral stress by the residual fraction. It is considered to be reasonable that the compaction induced stresses be added to the lateral earth pressures estimated from conventional gravity analysis considering the actual stresses during service life of the structures. "GEOLOG", a composite of steel bar and attached concrete stopper is found to be effective against tension and pull - out failure. In this paper, the design method considering the compaction induced stresses and the effect of Geolog reinforcement is suggested for the remforced earth structures where backkfill settlement on displacements are not allowed as in the cases of the bridge abutments or double faced reinforcement earth structures.tructures.

본 연구에서는 다짐 유발응력 (compaction induced stress)을 고려한 보강토 설계방법을 고안하였다. 현행 보강토 설계법은 다짐에 의해 유발되는 횡방향토압을 정량적으로 고려하지 라고 있으므로, 본 연구는 먼저 다짐 유발응력 산정방법을 검토하고 다음에 이를 보강토 설계에 통용 함으로써 새로운 설계방법을 제안하였다. 다짐 유발응력들 고려하면 벽체의 위쪽 부분에 토압이 산정되므로 이 부분에는 인장강도와 인발저항이 큰 보강재 사용이 바람직하다. 이를 위하여 새로이 개발한 보강재 GEOLOG를 소개하였다. 새로운 방법으로 보강토 옹벽을 설계하고 이를 종래의 방법과 비교 분석하여 보강토 공법에 관한 몇가지 결론을 제시하였다.