Dynamic Response of Single Pile Subjected to Different Frequencies in Gypseous Soil

Noor D Abd,Safa H Abidawn

doi:10.24237/djes.2020.13407

Abstract

This paper exhibits an experimental study on dynamic response of a single pile under dynamic load which comes from motor placed on cap pile called a vibration source. This study used the effect of the dynamic movement of vibration on one pile, collapsible soil (gypseous soil) used in this study with 30% gypsum content. The experiment is performed in a dry and soak state. A solid steel pile with a slenderness ratio of 27 was inserted into the soil after preparing it in layers in a steel container (30 * 30 * 60) cm. The test was performed under a dynamic response to the different frequencies 10, 15, 20, and 25 Hz. The results showed that the speed, acceleration and displacement increase with increasing frequency of the vibration source in addition to that the values of speed, acceleration and displacement amplitude are less in the case of soaking compared to their values in the dry state.

Highlights

Gypseous soil cover broad areas of the earth's surface, especially in southern Africa and some parts of Asia and southwestern United States of America [1]
After the pile was pushed into the soil and the static load projected, the dynamic pile analysis with the vertical load created by the machine. velocity, acceleration and displacement amplitude at the slenderness ratio (L/D) 27 pile of gypsum soils to each state, dynamic excitation applied to the pile of 10, 15, 20, and 25 Hz
As the velocity increases when increasing the frequency for both state, in addition to that the velocity in the dry state is greater than its value in the sunken state due to the decrease in vibration energy due to the presence of water in the soil, which in turn led to decrease the velocity of vibration for all tests

Summary

Introduction

Gypseous soil cover broad areas of the earth's surface, especially in southern Africa and some parts of Asia and southwestern United States of America [1]. As the cause of the collapse is due to the materials included in the composition of gypseous soil, which are sand, clay, or other materials [4,5]. This soil covers about 31.7% of the regions of Iraq with different gypsum ratios ranging from 10-70% as the buildings on which they are facing face many problems as a result of the high percentage of gypsum that. Pile foundations are used to support various structures on a large scale in weak and collapsible soils that are subject to static loads and dynamic loads. Fattah et al (2017) found that the deep foundation that is based on Impregnated sand, supporting machine and exposed to high frequency will be more likely to be liquefied [9]

Methods

Results

Conclusion