Void ratio effect on dynamic shear modulus and shear wave velocity for soil stiffness in Banda Aceh and Aceh Besar

Abstract

Aceh located in earthquake disaster-prone area because it is located between two tectonic plates and also surrounded by several active volcanos. When earthquakes shake, the building frequency (f) should not be equal to the natural soil frequency (fn) as it may cause the collapse of buildings. The purpose of this study is to determine dynamic seismic parameters value on the surface layers for forthcoming disaster mitigation. The object study for this research were Rahmatullah Lampuuk Mosque, Sultan Iskandar Muda Airport, Lambaro Bridge in Aceh Besar, TDMRC building, and Taman Sari. Soil samplings from the locations and data obtained from the BMKG such as earthquake center map, coordinates, magnitude, and earthquake depths were used in the study. The result of this research was Gmax value based on Richart method. Kramer method was also used for computing the fn parameters. Some static and dynamic calculation of design parameter result from Rahmatullah Lampuuk Mosque shows that with void ratio (e) = 0.92, the Gmax = 266 × 103 kg/ms2, Vs = 10.096 m/s and fn = 2.524 Hz. The comparison of fn and fstructure = 2.50 Hz which not equal to zero make the building were safe from collapse during previous earthquakes in Aceh.

Seismic Waves Response Characteristics of Niger Delta Soils

“…It has been established that larger void ratio may reduce the dynamic shear modulus and shear wave velocity of soil, and as well, the natural frequency (vibration) of soil due to earthquake load (Panuska and Frankovska, 2016;Munirwansyah et al, 2020). Therefore, it can be inferred from the range of void ratio recorded that Niger Delta soil may be resistant to earthquake.…”

Experimental Study of Awash Soil under Static and Cyclic Shear Loading

“…An accurate estimation of the dynamic properties of soil is essential for the precise assessment of soil's response to dynamic loads such as earthquakes, explosions, road and rail trafc, wind, pile-driving, blasting, and waves [1,2]. Tese loads difer depending on frequency, amplitude, loading rate, the repetition or number of cycles, the state of stress, stress history, strain levels, void ratio, confning stress, water content, and drainage condition, which causes reduction and increases the stifness of the material and damping [2][3][4][5][6][7].…”