Abstract.A laboratory experimental research in creep behavior of soft clay marine sediments was done to investigate creep strain under reloading. A total of 52 oedometer tests were carried out with 16 slurry sediment samples subjected to cycles of unloading at preload removal pressure and reloading to higher design pressures. Common practice as well as more recent advanced methods of creep deformation analysis were used to refine the predictions. The study indicates that although preloading substantially reduces post construction creep, the analysis is very sensitive to creep indices at slight overconsolidation and the resulting creep may not be negligible at previously established limits of primary to secondary compression ratios.
Abstract. Liquefaction mitigation can be achieved by dissipating seismic pore pressures. The research reported in this paper elaborates the effectiveness in dissipating seismic pore pressures of a gravel bed and relief well system using gravel columns in a case study in Cilacap, Indonesia. Seismic pore pressure generation was analyzed using commonly available methods in liquefaction analysis. The evaluated pore pressures in the sand layer and gravel columns were used in a 2D dissipation analysis using finite-difference consolidation equation solutions. The results of this study showed that a simple and cost-effective relief well and gravel bed or strip system can effectively dissipate excess pore pressures in the sand layer and gravel columns to a maximum residual pore pressure below 40%, thus reducing liquefaction potential as well as protecting the foundations in the sand.
Dalam interaksi dinamik tanah-tiang fundasi-struktur basement akibat beban gempa, gaya lateral tiang fundasi, gesekan tanah pada dinding sisi basement dan gaya lateral pada dinding basement akan timbul secara bersamaan. Dalam penelitian ini, distribusi dan perilaku gaya-gaya tersebut dianalisis dengan metode alih beban dan azas tegangan lateral tanah. Data yang digunakan dalam analisis diambil dari beberapa bangunan gedung di Jakarta. Hasil analisis menunjukkan bahwa fundasi tiang akan memikul sebagian besar beban interaksi, sedangkan tekanan lateral dan tegangan geser pada dinding basement sangat dipengaruhi oleh kondisi tanah, dan konfigurasi tiang dan basement. Kata-kata kunci : basement, beban gempa, distribusi beban, gaya gesek dinding, gaya lateral tiang, gaya normal dinding, interaksi dinamik.
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