Evaluation of Modulus of Subgrade Reaction for Analysis of Deep Excavation

• Main Authors: Vera Amalia Santoso Hie, 許秋慧
• Other Authors: Chang-Yu Ou
• Format: Others
• Language: en_US
• Online Access: http://ndltd.ncl.edu.tw/handle/e4nfvm

碩士 === 國立臺灣科技大學 === 營建工程系 === 95 === Evaluations of the modulus of subgrade reaction have been carried out by Modified Ou and Tung’s Equation based on beam on elastic foundation method. The theoretical equation is incorporated in Versatile Excavation Analysis program. In order to verify the equation, Plaxis finite element tool could be used as benchmark in analysis studies. However, it needs to be continuously fully validated against reliable field measurement results before used. In order to be realistic in simulating the real condition, there is an establishment of lateral earth pressure in the back of the wall along the twice depth of a tension crack in the Modified Ou and Tung’s theory based on beam on elastic foundation. A variation approach is employed to numerical problem for diaphragm wall embedded in clay soils using beam on an elastic foundation model. The Modified Ou and Tung’s Equation is validated against several hypothetical cases, such as linearly undrained shear strength to the depth, single, and two-layer of clay soil system with constant soil stiffness. Furthermore, the comparison of Plaxis, Rido, and VEX results will found that VEX give it best performance in the free earth support condition of the wall in which the uniformly wall movement is produced. Otherwise, the modulus of subgrade reaction obtained from Modified Ou and Tung’s Equation will be no longer applicable, even just for single layer of clay soil. The behavior of rigid walls lay on three different soil classifications (soft clay, medium clay, and stiff clay) then will be performed to gain better understanding on these behaviors. In addition, the flexible wall in soft clay will also be considered due to its consistency in giving well perform in wall displacement.