Effective improvement depth for ground treated with rapid impact compaction

Mohammed Mohammed, M. and Hashim, Roslan and Firas Salman, A. (2010) Effective improvement depth for ground treated with rapid impact compaction. Scientific Research and Essays, 5 (18). pp. 2686-2693. ISSN 19922248,

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Ground improvement has been used on many construction sites to densify granular material, in other word, to improve soil properties and reduce potential settlement. This paper evaluates the efficiency of rapid impact compaction (RIC), which is an improvement on the process of deep dynamic compaction, in ground improvement. In this technique, ground improvement is achieved by impacting the ground with a 7 tone weight, 35 times/min, and drop height of 0.8 m at 2.5 m C/C square grid spacing. Method evaluation is made by comparing the tip resistance of pre-treatment and post treatment cone penetrometer test (CPT) soundings. However, the effective improvement depths and the factors affecting the depth are discussed, and a formula for calculating the effective depth is presented. Vibration monitoring was conducted to check the effect of the vibrations born by RIC machine on the adjacent structures to assess how much the process is considered environmentally friendly and accordingly the challenging locations it can reach especially in the urban areas. It was found that the RIC succeeded in achieving the required degree of improvement, improvement depth depends on soil properties and energy applied; and the effective improvement depth formula presented by this study is true when the soil is granular and homogeneous with depth. Vibrations by RIC machine were within allowable limits and with controlled effect on the adjacent structures.

Item Type: Article
Additional Information: Cited By (since 1996):4 Export Date: 16 December 2013 Source: Scopus Language of Original Document: English Correspondence Address: Mohammed Mohammed, M.; Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Lembah Pantai Kuala Lumpur, Malaysia; email: malmudarris@yahoo.com References: Evaluation and measurement for vibration in buildings (part 2: Guide to damage levels from ground borne vibrations) (1993), BS 7385 part2, British Standards Institution, LondonCharels, J.A., Watts, K.S., (2002) Treated Ground Engineering Properties and Performance, pp. C572. , London: CIRIA; Kristiansen, H., Davies, M., Ground improvement using rapid impact compaction (2004) 13th World Conference On Earthquake Engineering, , Vancouver, B.C., Canada. Paper No. 496; Lunne, T., Robertson, P.K., Powell, J.J.M., Cone penetration test in geotechnical practice (1997) Blacker Academic & Professional, p. 312; Cone penetration test (2007) Georgia Institute of Technology, , National Cooperative Highway Research Program (NCHRP), SYNTHESIS 368, Atlanta, Georgia; New, B.M., Ground vibration caused by civil engineering works (1986), 53, p. 19. , Transport and Road Research Laboratory. Res. ReportRobert, G.L., (1995) Geotechnical Engineering Circular No.1, , Dynamic Compaction, Report FHWA-SA-95-037, Federal Highway Administration; Siskind, D.E., Stagg, M.S., Kopp, J.W., Dowding, C.H., Structure response and damage produced by ground vibration from surface mine blasting (1980) U.S. Bureau of Mines RI, 8507, p. 74; Tan, B.K., Bachelor, B., Foundation Problems in Limestone Areas - A Case Study in Kuala Lumpur, Malaysia (1981) Proc. Int. Symposium Weak Rock, Tokyo, 3, pp. 1461-1463
Uncontrolled Keywords: Cone penetration test, Granular soils, Ground improvement, Improvement depth, In-situ testing, Machine vibrations, Rapid impact compaction, RIC vibrations, Soil compaction, Urban areas
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 07 Jan 2014 04:16
Last Modified: 31 May 2019 05:01
URI: http://eprints.um.edu.my/id/eprint/8846

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