Area pemukiman padat penduduk yang berada di tepian sungai atau disebut area stren kali memiliki permasalahan yang komplek yakni, permasalahan sosial, pendidikan, ekonomi dan juga kesehatan lingkungan, terlebih dimasa pandemi Covid-19 ini. Di masa pandemi Covid 19 ini, penduduk di kawasan padat penduduk yang berada pada lingkungan yang dekat dengan sungai yang cukup deras harus lebih berhati-hati. Sebagaimana diketahui bahwa peningkatan kasus Covid di Kota Surabaya sudah menunjukkan angka yang cukup tinggi. Sehingga Surabaya ditetapkan sebagai zona merah. Petugas Satgas Covid-19 yang sudah dibentuk oleh pimpinan setempat masih berupaya mengawasi keadaan di wilayah tersebut terutama RW.01 yakni daerah stren kali pada RT 2 dan RT.6. Permasalahan mencakup kurang pengetahuan dasar dalam penanganan keadaan pandemi Covid-19 dan menyikapi kehidupan pada new reality saat era pandemi. Dengan metode 3 (tiga) bidang ecoliterasi yakni eco-healthy, eco-collaboration dan eco-education, metode tersebut diharapkan dapat menyelesaikan masalah terutama pada masyarakat di daerah stren kali pada RT. 2 dan RT 06. Waktu kegiatan dilaksanakan dengan standar protokoler kesehatan yakni skala kecil dan daring jika melibatkan banyak warga.
Surabaya has an earthquake potential reach to 6.5 Mw. Moreover, on average, Surabaya area is a lowland which is alluvial deposits. Thus, it is required to perform potential liquefaction. Liquefaction potential analysis was performed by taking the soil data from the center of Surabaya. The initial of liquefaction potential analysis was conducted by considering soil gradation, relative density (DR), fine content (FC), degree of saturation (SR) dan SPT number. However, the advanced analysis was undertaken by utilizing Youd and Idriss 2001 dan metode Idriss 2008. The results of initial of liquefaction potential analysis show that the soil has potential to be liquefied at the depth 1-7m, however at the depth 22m the soil is not liquefied. Furthermore, the results of advanced analysis and conclusions of the analysis show that the soil has a liquefied potential at the depth 17 m from the surfaceABSTRAK Kota Surabaya memiliki potensi gempa yang terjadi bisa mencapai 6.5 Mw. Selain itu, Wilayah kota Surabaya merupakan daerah yang rata-rata dataran rendah, yang berkisar 80% merupakan endapan alluvial. Sehingga perlu dilakukan analisis potensi likuifaksi. Analisis potensi likuifaksi hanya dilakukan pada data tanah wilayah Surabaya Pusat. Analisis awal potensi likuifaksi dilakukan berdasarkan aspek gradasi tanah, relative density (DR), fine content (FC), derajat kejenuhan (SR), dan jumlah pukulan SPT. Sedangkan analisis lanjutan dengan menghitung Cyclic Shear Ratio (CSR), Cyclic Resistance Ratio (CRR), dan Factor of safety (FS) dengan menggunakan metode Youd dan Idriss 2001 dan metode Idriss 2008. Berdasarkan analisis awal, pada kedalaman 1-7 m masih ada potensi likuifaksi, sedangkan tidak ada lagi potensi likuifaksi pada kedalaman lebih dari 22 m. Berdasarkan analisis lanjutan dan kesimpulan analisis, hampir semua kedalaman memiliki potensi likuifaksi hingga kedalaman 17m.Kata kunci : Likuifaksi; gempa; analisis potensi likuifaksi
This paper presents an evaluation of probabilistic slope stability due to updating of Indonesia seismic hazard maps from 2010 to 2017 edition. The evaluation is conducted by presenting case study to compare the probability of failure of slope which subjected to seismic load determined from those seismic hazard maps. At first, simple slope models are built and the horizontal seismic coefficients are selected. Then, the probabilistic slope stability analysis is conducted using Monte Carlo simulation in LEM-based software so called Rocscience Slide 6.0. The simulation results indicate that the revision of Indonesia seismic hazard maps causes increasing of probability of failure of slope in the study area. These results show that the slope models become more prone to failure subjected to seismic load obtained from the seismic hazard maps.
One of the methods has been used to identify the behavior of pile foundation while receiving axial load is t-z method. By using T-z method, the behavior of pile foundation while transferring the axial load (load transfer, t) and settlement (z) which is called load-settlement curve could be quantified. In this research, driven pile is used with the soil is predominantly clay. TZPILE is employed to generate load-settlement curve. That load-settlement curve which were generated by TZPILE is then compared with that of Static Loading Test (SLT). According to that comparison, a load-settlement curve has been predicted (predicted SLT) if downdrag condition is applied. On the other hand, the methods of Davisson (1972), Van Der Veen (1953), andMazurkiewicz (1972 are utilized to calculate ultimate bearing capacity (Qult) and allowable bearing capacity (Qall) by interpreting the data of SLT and predicted SLT. Thereafter,evaluation of working load has been carried out by considering the settlement of load-settlement curve. The results of TZPILE show that the load-settlement curve is well predicted so then it can be adopted to predict load-settlement curve of SLT in downdragcondition. Three methods of interpreting of SLT and predicted SLT show that Qall are greater than working load, otherwise predicted SLT. Evaluations of Qall by considering the settlement show that Qall is greater than the results of Davisson (1972), Van Der Veen (1953), and Mazurkiewicz (1972). Surprisingly, all the results show that Qall is greater than working load.
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