CPT-Based Assessment of Densification After Ground Improvement with Rigid Inclusions and Rammed Aggregate Piers® (RAP)

Date

2020-01-01

Author

Çetin, Kemal Önder
Oner, Lale
Arda, Serhan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

242
views

0
downloads

© 2020, Springer Nature Switzerland AG.Within the scope of this manuscript, the mitigation performance of a composite ground improvement solution, which is composed of 18 m long 40 cm diameter GeoConcrete® Column (GCC) and 50 cm diameter Impact® Rammed Aggregate Pier® (RAP) along with 40 m long 80 diameter piles is assessed by pre- and post-cone penetration testing (CPT). These elements are designed for controlling excessive total and differential settlements, and liquefaction triggering at a paper mill site. In this paper, the site geology, geotechnical model, design aspects of GCC and Impact® RAP patented systems and QA/QC measures are discussed. As a mitigation solution, 18 m and 40 m long elements are designed to be constructed in the soft to medium stiff silty clay with scattered silt and sand interlayers. Improvement expectations from GCC and Impact® RAP elements are partially verified by pre- and post-CPT data, and are listed as: (i) densification of cohesionless silt and sand layers, (ii) shear stress transfer to rigid columns during cyclic (seismic) loading, reducing seismic demand from foundation soils (iii) increased horizontal stresses, leading to increased soil (and column) stiffness and strength, (iv) vertical drainage through aggregate columns to dissipate cyclically – induced excess pore water pressures. The results show that due to ramming and vibration induced-densification, cone tip resistance has increased by a factor of 1.3–1.6 in cohesionless layers.

Subject Keywords

Rammed aggregate pier, Geoconcrete, Column Cone Penetration Test (CPT), Densification

URI

https://hdl.handle.net/11511/56242

DOI

https://doi.org/10.1007/978-3-030-32029-4_70

Collections

Department of Civil Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Performance Monitoring of Rammed Aggregate Piers: A Stockyard Case History Site Kurt Bal, Ece; Öner, Lale; Çetin, Kemal Önder (null; 2018-06-07) This paper investigates the design aspects of Rammed Aggregate Pier® (RAP) treatment as a composite treatment for the unfavourable ground conditions, the construction, QA/QC measures and the verification of the performance via a comprehensive instrumentation scheme. For this purpose, instrumented full scale load test was performed for the stockyard project site in Izmir, Turkey. The soil profile is comprised of fill and soft sandy clay layers overlain by the pyroclastic bedrock. 6 to 18 m long RAP elements ...
Estimation of grain characteristics of soils by using cone penetration test (CPT) data Ozan, Cem; Çetin, Kemal Önder; Department of Civil Engineering (2003) Due to lack of soil sampling during a conventional cone penetration testing (CPT), it is necessary to classify soils based on recorded tip and sleeve friction and pore pressure (if available) values. However, currently available soil classification models are based on deterministic and judgemental determination of soil classification boundaries which do not address the uncertainties intristic to the problem. Moreover, size and quality of databases used in the development of these soil classification models ...
Numerical simulation of dynamic shear wall tests: A benchmark study Kazaz, I; Yakut, Ahmet; Gulkan, P (2006-03-01) This article presents the numerical simulation of a 1/3-scale, 5-story reinforced concrete load bearing structural wall model subjected to seismic excitations in the context of IAEA benchmark shaking table experiment conducted in laboratories of CEA in Saclay, France. A series of non-linear time history analyses were performed to simulate the damage experienced and response quantities measured for the specimen tested on a shaking table. The mock-up was subjected to a series of artificial and natural earthqu...
Passive control of flow separation over delta wings at high angle-of-attack Van Dyken, R.; Yu, K.; Gutmark, E.; Tuncer, İsmail Hakkı; Platzer, M.; McLachlan, B.; Bell, J. (1996-01-01) © 1996, American Institute of Aeronautics and Astronautics, Inc.The effect of aft-swept and forward-swept canards on the flowfield over a close-coupled canard-wing-body configuration at a 20 degree incidence angle is investigated in two low-speed wind tunnels over a Reynolds number range of 0.25 to 1 million. Laser sheet and oil flow visualization are used to observe the vortical flow and surface flow patterns. Surface pressure distributions are determined by means of pressure sensitive paint. Turbulent flo...
CPT-Based Probabilistic Soil Characterization and Classification Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2009-01-01) Due to lack of soil sampling during conventional cone penetration testing, it is necessary to characterize and classify soils based on tip and sleeve friction values as well as pore pressure induced during and after penetration. Currently available semiempirical methods exhibit a significant variability in the estimation of soil type. Within the confines of this paper it is attempted to present a new probabilistic cone penetration test (CPT)-based soil characterization and classification methodology, which ...

Citation Formats

K. Ö. Çetin, L. Oner, and S. Arda, “CPT-Based Assessment of Densification After Ground Improvement with Rigid Inclusions and Rammed Aggregate Piers® (RAP),” 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56242.