Dissertation/Thesis Abstract

Reduction in psuedospectral acceleration at soft clay sites with the installation of deep soil mixed soil-cement panels
by Al Quraishi, Murtdha Hashim Hassoon, M.S., California State University, Fullerton, 2016, 256; 10244537
Abstract (Summary)

Improving the engineering properties of soil through soil modification has been implemented in practice for a number of years. However, construction over soft soil sites has remained a major challenge for projects all over the world because the ground shaking amplifies as it travels through soft soils and will result in an increase in the pseudospectral acceleration. Design of infrastructure depends on the seismic shaking levels from an earthquake. If the amplification of the ground motions can be reduced, the design of the infrastructure can be more economical. For this research, a laminar box was constructed, fitted with a drainage system and filled with a soft clay soil. The laminar box can freely deform during shaking tests and is more representative of free-field conditions. However, previous studies were performed using a rigid box. After the soft clay was consolidated to a pressure of the effective vertical pressure of 10 kPa, accelerometers were installed into the soft clay and a series of unidirectional 1-G shake table tests were conducted with different seismic shaking levels on both models with unimproved and improved soil profiles using deep soil mixed soil–cement panels. The improved deep soil mixed soil–cement panels were constructed at 10% and 20% replacement ratios (RR), which is defined as the ratio of the plan area of the soil-cement to the plan area of the soft clay profile. The present research shows that the deep soil mixed soil–cement panels effectively reduced the pseudospectral accelerations of ground shaking with the installation of panels having both the 10 % RR and 20% RR. On average, a reduction in pseudospectral acceleration was observed to be about 63% for 10 % RR and 59% for 20% RR.

Indexing (document details)
Advisor: Ajmera, Beena
Commitee: Naish, David, Tiwari, Binod
School: California State University, Fullerton
Department: Civil Engineering
School Location: United States -- California
Source: MAI 56/03M(E), Masters Abstracts International
Subjects: Engineering, Civil engineering
Keywords: Laminar box, Pseudospectral acceleration, Seismic amplification, Shake tables, Soft clay
Publication Number: 10244537
ISBN: 9781369445909
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