ABSTRACT
In some cases, basement wall work still often occurs as a construction failure with a variety of causes. One of them is a basement construction project for an apartment and mall in Grand Dharmahusada Lagoon. The first plan of the basement wall didn’t strong enough to resist a lateral movement of the soil. The previous studies have been carried out by redesigning the retaining wall using a diaphragm wall and ground anchor as a support system. The results are obtained that the use of diaphragm walls can decrease the value of displacement that occurs on the wall. However, previous studies have only conducted a review of the diaphragm wall thickness. This study adds several numbers of anchors as research variables to find effective and efficient combinations. This study compares the effect of diaphragm wall dimensions with a different number of anchors on the deformation value and safety factor. Based on the results of the study, a wall thickness of 1.75 m with a depth of 33 m using 3 anchors a deformation occurred are 3.63 m while using 4 anchors a deformation occurred are 2.37 m. The difference in deformation is 1.26 m. Because the value of deformation was still large, it carried out a re-design for the anchor position, and diaphragm wall dimension with the same number of anchors, and the deformation results were reduced to 15.81 cm with a safety factor of 1.3.
