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All Journal REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
I. Fadliah
Jurusan Teknik Sipil, Fakultas Teknik Universitas Tadulako, Jl. Soekarno-Hatta Km 9, Palu 94118, Indonesia
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Pengaruh Tinggi Muka Air Terhadap Deformasi Tanah Terlikuefaksi A. Beddu; R. Rahainun; I. Fadliah; A. Rahayu; H. Setiawan
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 3 Issue 2 (September 2022)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v3i2.457

Abstract

Liquefaction occurs in saturated loose sandy soils that experience an increase in pore water pressure due to the propagation of earthquake waves to the ground surface. This phenomenon raises various questions such as how the groundwater level can affect the occurrence of liquefaction events at different earthquake strengths. The purpose of this study was to determine the effect of groundwater level on liquefaction-prone soils at different seismic peak acceleration values and the effect of relative density (Dr) values on liquefaction-prone soils with variations in groundwater level and earthquake acceleration. In this study, a sample of Jono Oge sand soil was used from the occurrence of liquefaction that met the gradation criteria. The soil was separated through the #8 sieve and retained #100. The modeling technique is carried out with several variables such as the ratio of groundwater level (Hw/Hs) of 25%, 50%, 75%, and 90%, relative density (Dr) 30%-40% and 40%-50%, and at different peak accelerations of 0.3g and 0.4g. The modeling test uses a sieve shaker for earthquake vibrations.. The results of the study show that the difference in groundwater level affects the subsidence of liquefied soil where the settlement will be accure greater in the ratio of the groundwater level (Hw/Hs) and the peak acceleration is greater and vice versa, the difference in relative density (Dr) also affects the magnitude of the the settlement where the lower the Dr value for Hw/Hs and the greater the peak acceleration, the greater the settlement will be occure.
Kajian Perilaku Kuat Geser Tanah Terhadap Penambahan Serat Karung Goni M. Martini; I. Fadliah; B. Biru
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 4 Issue 1 (March 2023)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v4i1.536

Abstract

Soil improvement is a method to improve the physical and mechanical properties of soil that are not good. Soil improvement methods include chemical, mechanical, hydraulic, and reinforcement methods for example by adding geosynthetic sheets/fibers or steel rods. However, the use of these methods is relatively quite expensive from the aspect of the materials used when applied to small-scale volume work. This research tries to examine the behavior of the soil that is given the addition of jute sack fiber, especially to changes in shear strength/soil shear strength parameters. Jute sacks are an alternative material as a substitute for fiber of the Geosynthetic type, jute sacks have a rough texture made of jute fiber, where jute fiber is the second most used natural fiber after cotton. Jute fiber itself can be taken from the bark of the bast fiber tree. Jute itself is an environmentally friendly fabric because it is made from bio-degradable fibers and is included in fabrics made of 100% plant fibers. The percentage of jute fiber used was 0.25%, 0.50% and 0.75% of the dry weight of the soil with variations in length of 1.5 cm, 2.0 cm and 2.5 cm. The sample of soil tested is sandy type from the permanent residential area of Tondo, Mantikulore sub-district, Palu, Central Sulawesi. The addition of fiber has more effect on changes in the value of the soil friction angle than the value of cohesion. Jute fibers with lengths of 1.5 cm and 2.5 cm at percentages between 0.25% and 0.75% tend to increase, but at 2 cm length tend to decrease the value of shear strength. Fiber length and burlap percentage influence each other in increasing and decreasing the value of soil shear strength
Co-Authors A. Beddu A. Rahayu B. Biru H. Setiawan Martini Martini R. Rahainun