2013 Session: 622

• Settlement Calculation and Backanalysis of Soil Properties for Test Embankment on Soft Clay Ground Improved by PVD and Vacuum-Assisted Preloading at a Site in Vung Tau, Vietnam
  Abstract: Application of vacuum assisted preloading is helpful when a considerable load is required to meet the desired rate of settlement and an increase in the undrained shear strength in a relative short time. To facilitate the vacuum propagation, vertical drains are usually employed in conjunction. The installation of vertical drains using a steel mandrel creates significant remoulding of the subsoil surrounding the drains thereby, reducing soil permeability and adversely affecting the soil consolidation process. In this research study, performance of a test embankment on a soft clay ground improved by vacuum combined with PVD and surcharge preloading at the site of Saigon International Terminals Vietnam (SITV) in Ba Ria-Vung Tau Province is presented and analyzed. The calculated settlement results are compared with the available observation data. Besides, soil parameters were back– calculated and compared with those obtained from soil investigation.
  Authors: Su, Dang
  Authors: Su, Dang
  Year: 2013
  Document Type: Paper
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-0224
• Field Study on Construction of Highway Embankment Made from Two Tire-Derived Aggregate Types and Tire-Derived Aggregate Mixed with Soil as Fill Materials
  Abstract: A field study is undergoing to investigate the construction and immediate compression behaviour of a highway embankment made from Tire Derived Aggregate (TDA) and TDA mixed with soil. The test embankment is part of an access road and is 80 m long. It contains four different test sections, each 20 m long: Section 1 contains TDA made from Passenger and Light Truck Tire (PLTT), Section 2 contains TDA from Off-The-Road (OTR) truck tire, Section 3 contains TDA from PLTT mixed with soil with a ratio of 50%:50% by volume and Section 4 (control section) is filled with normal soil. The embankment is instrumented with 30 temperature probes, 25 settlement plates, 12 (Time Domain Reflectometers) TDRs and 6 earth pressure cells. TDA was placed in two layers each 3-m-thick, and with 0.5-m-thick soil cap to separate the two layers and 1-m-thick soil cover on the very top. Falling Weight Deflectometer (FWD) tests were also conducted on the embankment after the placement of the one-meter soil cover. The construction of the embankment was completed with conventional construction equipment without any major problem. Observations during the construction showed that the PLTT was relatively difficult to spread and highly compressible. The temperature probes showed no internal heating in the embankment during or after the construction until present. The settlement plates and FWD test on top of the one-meter soil cover showed that Section 1, made with the PLTT, was the most compressible section of all.
  Authors: Meles, Daniel; Bayat, Alireza; Shafiee, Mohammad Hussein; Nassiri, Somayeh; Gul, Mustafa
  Authors: Meles, Daniel; Bayat, Alireza; Shafiee, Mohammad Hussein; Nassiri, Somayeh; Gul, Mustafa
  Year: 2013
  Document Type: Paper
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-4122
• Estimation of Time Rate of Settlement for Multilayered Clays Undergoing Radial Drainage
  Abstract: This paper demonstrates how the finite difference technique can be used to estimate the time-rate of settlement for soft, compressible clayey soils treated with prefabricated vertical drains, at sites where primary consolidation settlement is occurring in a multilayered system at varying rates. Semi-empirical methods based on surface settlement monitoring have typically been used to estimate the progression of primary consolidation settlement. However, interpretation of such methods can be problematic for multilayered soil profiles. For such sites, it is crucial to obtain a reasonable characterization of the foundation soils’ horizontal drainage properties and include these estimates in the time-rate of settlement projections. Field monitoring of subsurface instrumentation is extremely valuable in providing additional information regarding the consolidation behavior of different layers. When subsurface field measurements are coupled with the proposed numerical method, far more reliable projections are obtained. This paper focuses on how to integrate field and laboratory data with time-rate of settlement projections obtained from semi-empirical and finite difference methods to more accurately predict the time-rate of consolidation behavior of multilayered foundation soils.
  Authors: Farnsworth, Clifton B.; Bartlett, Steven F.; Lawton, Evert C.
  Authors: Farnsworth, Clifton B.; Bartlett, Steven F.; Lawton, Evert C.
  Year: 2013
  Document Type: Paper
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-1567
  Practice-Ready: Yes
• Compression Behavior of Compacted Tire-Derived Aggregate Using a Static Compaction Method
  Abstract: Previous studies used a dynamic method of compaction similar to soil to compact tire-derived aggregate (TDA) in the laboratory. However, TDA for a civil engineering application does not meet the requirements specified by ASTM D 698 or D 1557. Moreover, predictions of field compression for TDA based on one-dimensional compression curves compacted dynamically in a laboratory gave results that deviate from measured strain in the field. In this study, the compacted unit weight and compression behaviour of TDA material with a maximum size of 75mm was investigated in a laboratory. A static method of compaction was used to measure the compacted unit weight and to prepare samples for compression tests. The static method of laboratory compaction simulated field compaction with respect to TDA particle arrangement after compaction. The stress-strain curve obtained from the one-dimensional laboratory test predicted the measured field strain for case studies shown in this study more accurately than previous laboratory compression curves reported in the literature.
  Authors: Meles, Daniel; Bayat, Alireza; Chan, Dave
  Authors: Meles, Daniel; Bayat, Alireza; Chan, Dave
  Year: 2013
  Document Type: Paper
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-4075
  Practice-Ready: Yes
• Estimation of Time Rate of Settlement for Multilayered Clays Undergoing Radial Drainage
  Authors: Farnsworth, Clifton
  Authors: Farnsworth, Clifton
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-1567
• Compression Behavior of Compacted Tire-Derived Aggregate Using a Static Compaction Method
  Authors: Bayat, Ali
  Authors: Bayat, Ali
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-4075
• Field Study on Construction of Highway Embankment Made from Two Tire-Derived Aggregate Types and Tire-Derived Aggregate Mixed with Soil as Fill Materials
  Authors: Bayat, Ali
  Authors: Bayat, Ali
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Geotechnology
  Session: 622
  Paper Number: 13-4122