SETTLEMENT OF BANDUNG CLAY UNDER TRIAL EMBANKMENT LOADING FOR THE PADALARANG-CILEUNYI TOLL HIGHWAY

• Main Author: Hari Wilopo, Didik
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2717
• Institution: Institut Teknologi Bandung

SETTLEMENT OF BANDUNG CLAY UNDER TRIAL EMBANKMENT LOADING FOR THE PADALARANG-CILEUNYI TOLL HIGHWAY, Wilopo, Didik H., 1988 Program Sistem dan Tehnik Jalan Raya, Fakultas Pasca Sarjana, Institut Teknologi Bandung. Construction of a toll highway between Padalarang and Cileunyi to provide a fast bypass around the city of Bandung is currently underway. The eastern segment of the route transverses an old lake bed containing a deep layer of soft volcanic materials. Because of the difficulty of accurate prediction of time-settlement relationships for construction over soft ground, use of full-scale field trials is frequently adopted to ensure that a proper engin eering appraisal of a given situation can be made before decisions on rate of construction or possible ground improvement techniques are taken. Such an approach was adopted for the eastern segment of the Padalarang-Cileunyi toll highway, with various trial sections being constructed between October 1987 and March 1988 at km 37 on the alignment. In the trial six different sections, two were raised without any foundation treatment, two incorporated geodrains to two different depths with different spacings, and two involved use of polymer grid reinforcement in different layouts in the bases of the embankment sections. This thesis discusses and analyses the settlement performance of each of the trial sections. The theoretical rates of settlement and computations of total settlement were obtained using a computer program. Good correlations between theoretical and actual settlement behaviour were obtained. The open structure and drainage seams in the deposit, a function of the geologic-al background, showed that the rate of -settlement was significantly higher than might be determined by using conventionally obtained geotechnical data, in line with other published observations on soft ground behaviour under loading. The rate of settlement was such that the use of geodrains for normal embankment heights was not deemed necessary. Surcharge would be an adequate means of largely eliminating the problem of post construction settlement, such that the use of rigid pavement could proceed with some confidence. For the base reinforcement trials, it was found that two layers of the relatively weak SS2 geogrid had no influence on reducing settlement, whereas the semi-rigid geocell form of construction reduced the total settlement by about 30%, as well as the transverse differential settlement. Little lateral movement was observed in the inclinometer readings. Field settlement readings also showed that the ground yield stress was higher than that from predicted conventional site investigation data and analysis, indicating that a significant amount of disturbance took place in the cur-rent methods of investigation as adopted for these soft soils