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Abstrak :
Next generation ground motion prediction models use shear-wave velocity over the top 30 m of subsoil (VS30) as an important assessment parameter of seismic ground surface motion. VS30 can be measured using invasive methods, such as boreholes, or non-invasive methods, such as multichannel analysis of surface waves (MASW). To evaluate this technique in a variety of near-surface conditions, MASW-derived shear-wave velocity profiles (s-wave velocity vs. depth) were statistically compared to direct borehole measurements from three locations of Merapi sediment found on the Universitas Muhammadiyah Yogyakarta (UMY) campus site. A detailed study of the effect from the total number of recording channels of MASW, sampling intervals, source offset, and receiver spacing was conducted near the borehole test site. The soil was classified as a medium soil or SD. The MASW method, which is non-destructive and non-invasive in nature and relatively faster in assessment, provides more reliable shear-wave velocity profiles, i.e. from 0 to 30 meters below the ground surface.

Abstrak :
This book combines soil science, earth science, and environmental geochemistry, providing comprehensive background information for specialists interested in chemical-induced changes in the soil-subsurface system. The major focus of the book is on changes to the soil-subsurface matrix and properties caused by chemical pollution. The numerous examples presented in the book confirm that chemical contamination should be considered as an additional factor in the formation of a contemporary soil-subsurface regime that is different than that of the pristine system.

Abstrak :
Pondasi tiang bor merupakan tipe pondasi yang sering digunakan dalam konstruksi karena adanya fleksibilitas desain dan pelaksanaan di lapangan. Seringkali kapasitas lateral tiang pondasi ditingkatkan dengan penggunaan tiang grup. Pondasi diameter besar kemudian muncul pada struktur lepas pantai sebagai substitusi dari tiang grup tersebut guna mempermudah proses konstruksi dengan tingkat keamanan yang sama. Studi yang dilakukan adalah meninjau perilaku pondasi tiang bor dengan diameter besar pada tanah lunak terutama untuk meninjau gaya-gaya reaksi terbesar yang mempengaruhi pergerakan pondasi. Lapisan tanah lunak yang tebal kemudian diinterpretasikan melalui data tanah di Ancol, Jakarta Utara. Pemodelan tanah dan struktur pondasi tiang bor dilakukan dengan bantuan perangkat lunak PLAXIS 3D Foundation untuk meninjau arah gaya-gaya reaksi dalam tiga dimensi.

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Bored pile is one of the foundation type widely used in construction because of its design flexibility. For a laterally-loaded bored pile, an additional pile and pilecap plays an important role in influencing the lateral capacity. Large diameter bored pile then proposed to substitute group pile in order to simplify construction method. This study examine laterally-loaded large diameter bored pile behavior on soft soil to comprehend the distribution of lateral soil resistance and failure behavior. Thick soft soil layer interpreted through soil testing data at Ancol, North Jakarta with domination of silt. A thorough analysis of this system are modeled using three-dimensioal numerical method, PLAXIS 3D Foundation.