곡선형 띠장을 이용한 토류벽 공법의 적용성에 관한 연구

Abstract

Establishing many struts in the existing earth retaining structure brings about the increase of construction cost as well as construction period. There are many researches on the earth retaining structure and as a result, many new construction methods have been developed to be used in the field. However, the methods have limits to their application because of the secondary use of rigid materials and subsidiary materials. Consequently, it is urgently needed to develop new construction methods to satisfy construction, safety, and economical efficiency at the same time. For this reason, this study analyzed the behavioral characteristics of the curved wale to complement such problems, and compared the virtual base and virtual section with the existing methods in order to examine the application of actual base. Finally, the following results were obtained. Based on the 10-meter curved wale, the rigid material of 350*350 had the max. allowable displacement of 5 cm in the center within allowable tensile stress. The max. transverse force was estimated at 16.25 tf and resisting moment, at 81.24 t-m. The behavior of the curved wale was analyzed with the increment of random external force by step. While bending stress ratio was found to become more stable with the displacement of a curved beam, shear was less stable than bending stress. It suggests the need of shear reinforcement in the part of exceeding shear. Available span length associated with applied load of general and curved wales was compared. The rise width of load which the curved wale could resist was increased 215%, compared with the general wale in the rigid material of 350*350. After virtual section was established, the curved wale was applied. In the application of digging depth of 5~20m, the safety rate of allowable bending stress ratio was found to be increased average 3.53 times, and allowable shear stress ratio was found to be increased 1.23 times, compared with the existing method. On the other hand, the safety rate of bending stress by base condition was found to be increased 2.59 times, and allowable shear stress ratio was found to be increased 1.20 times, compared to the existing method.