Backfilled soil parameters monitoring on VCM site using destructive and non-destructive techniques

Name: Alditra, Diandri Fakhri

LCSH: Kasetsart University -- Theses. M.Eng. (Civil Engineering) 2020

Classification :.LCCS: TA710

LCSH: Kasetsart University. -- Department of Civil Engineering -- Theses

LCSH: Soil stabilization

LCSH: Soil consolidation

LCSH: Surface waves (Seismology)

LCSH: Seismic waves

LCSH: Shear waves.

LCSH: Seismology

Abstract: Rapid growing city, such as Bangkok, has a high demand for the housing sector. When the whole area is practically occupied by buildings, some swampy areas were chosen as the next construction site and as a result, were filled with soil. The newly filled soil requires a long period of time to be applicable for construction. A Prefabricated Vertical Drain (PVD) with the Vacuum Consolidation Method (VCM) is able to make the newly filled soil applicable for construction in a short period of time. The airtight sheet is present when using the VCM method to maintain the vacuum pressure in the soil, this made destructive soil monitoring during ground improvement could not be done since it will damage the airtight sheet. The soil monitoring during ground improvement still could be done using a non-destructive test. One of the non-destructive tests is the Spectral Analysis of Surface Waves (SASW). This research aims to study the development of the shear-wave velocity over the consolidation period, to create correlations between the shear-wave velocity (Vs) with the settlement, pore water pressure, and undrained shear strength, for a VCM settlement prediction based on the Vs, and to study the possibility of using the SASW method to monitor the effectiveness of the VCM method. There were multiple instruments installed on the site such as vacuum gauges, settlement plates, and a piezometer, to monitor the pump pressure, settlement, and porewater pressure, and furthermore, borehole testings were done before and after the ground improvement to monitor the soil properties. 28 SASW test was done to measure the change in shear-wave velocity (Vs) over approximately 9 months period. The result showed, over the consolidation period, an increment of the Vs about 55 m/s along with the increments in the settlement about 1 meter and undrained shear strength increased approximately 6-18 kN/m2, also a decrement in pore pressure about 30 kPa. The correlation between Vs and soil settlement was made to predict the amount of settlement based on the Vs showing a close match with both settlement curves from field measurement and settlement prediction curve from the Asaoka (1978) method. Shear-wave velocity and undrained shear strength showing a similar pattern for before and after the ground improvement. These results indicated the likelihood of using the SASW method for soil improvement monitoring purposes.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Susit Chaiprakaikeow

Role: Thesis Advisor

Name: Suttisak Soralump

Role: Thesis CO-Advisor

Created: 2020

Modified: 2025-07-09

Issued: 2025-07-09

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/diandri-fak-all.pdf

CallNumber: TA710 .A43

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Civil Engineering

Grantor: Kasetsart University

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