Tol Serpong Balaraja adalah proyek infrastuktur yang diharapkan menjadi solusi pemecahan masalah kepadatan lalu lintas di Tangerang Selatan. Pada proyek Tol Serpong Balaraja terdapat pekerjaan dinding penahan tanah pada STA 2+200 – STA 2+400 untuk menahan timbunan yang menerima beban jalan on/off ramp. Tujuan dari studi ini adalah untuk mengetahui perbandingan antara perencanaan dinding penahan tanah menggunakan metode soldier piles dan reinforced earth wall dengan perkuatan geogrid. Permodelan stabilitas internal dinding penahan tanah pada setiap metode dilakukan menggunakan PLAXIS. Dan stabilitas eksternal dihitung berdasarkan tegangan tanah horizontal. Hasil analisis menunjukkan bahwa dinding penahan tanah yang menggunakan soldier piles, menunjukkan stabilitas internal yang lebih besar daripada metode reinforced earth wall.

A preliminary research to investigate the creep behavior of bentonite as buffer material in a high-level nuclear or radioactive waste disposal hole as bentonite needs to maintain the stability of the waste canister for a long time, to avoid the displacement caused by the weight of the canister itself and the thermal, hydrological, mechanical and chemical (THM-C) processes of the near filed. The increase of bentonite time-dependent strain or creep needs to be taken into account for the safety of the disposal hole. The creep parameters obtained from the angular strain rate equation, through stress-controlled direct shear test using compacted SPV200 bentonite samples. The test results show an increase in angular strain rate with increasing of the applied stress.

Drainage refers to a vital component for water disposal so that a region or area can hinder potential puddle due to excessive water on the land surface. Therefore, a good plan adjusting the land condition of residential area belongs to a fundamental matter. Jade Hamlet Residence is located on Hulaan highway, Hulaan Urban Village, Menganti District, Gresik Regency, covering an area ±20 hectares and consisting of housing area, park, public facility, and catchment area. The drainage channel at this residence serves as the drainage for rain water and household dirty water disposal. During the rainy season in 2018 and 2019, the channel and bozem or drainage basin of this residence encountered overflowing and eventually caused puddle. To overcome this problem, the capacities of bozem and channel are in need of analysis and evaluation so as to figure out the runoff volume that can be accommodated in the bozem and investigate the discharge planned in the drainage channel by employing Log Person III method, chi-square distribution fit test, Kolmogorov-Smirnov test, rational formula, and exponential method. The results of analysis and evaluation demonstrated that the bozem capacity could not afford the runoff discharge (298.35 m3 309.55 m3), thereby demanding additional length and depth against the existing bozem. Meanwhile, the calculation of flood discharge planned for the drainage channels of S4.Ry3, S6.Ry1, S6.D1, S6.I2, S6.Cs1, S6.Rc1, S6.Rc2 indicate that they need redesigning by altering the channel dimension as the discharge capacity exceeds the channel.