Flat Dilatometer (DMT) downloadable papers.
Prof. S. Marchetti firstname.lastname@example.org   Tel +39 06 303.60.107
This is NOT a commercial website.
For this kind of info:link
Abstract: A dilatometer test consists of pushing a flat blade located at the end of a series of rods. Once at the testing depth, a circular steel membrane located on one side of the blade is expanded horizontally into the soil. The pressure is recorded at specific moments during the test. The blade is then advanced to the next test depth.
The main application of the DMT is to estimate quickly and accurately Operative Moduli and Settlements of Foundations. Settlements are necessary to the designer e.g. to choose between a shallow foundation or a piled foundation.
Other design applications include: compaction control, detecting slip surfaces in slopes, liquefiability, laterally loaded piles and other geotechnical problems using the soil parameters for which the instrument provides estimates.
|2-3 Apr||Dubai DFIMEC 2014 "Latest developments on in situ testing, pile-raft foundations and FEM". Lecture by S. Marchetti on DMT.|
|13 Apr||Egypt Tanta University. Emerging Technologies in Field Testing and Soil Characterization. Lecture by Dr. Buselli on DMT - SDMT.|
|15-16 May||Darmstadt Germany. Seminar "All aspects relating to Liquefaction" Technical University, Keynote Lecture by S. Marchetti: "Estimating Liquefaction Resistance taking into account Stress History by DMT".|
|30 May||Hamilton-Ontario CANADA. Workshop on Flat Dilatometer and Seismic Dilatometer by Marchetti, Crapps, Failmezger.|
|2-6 June||Bali Indonesia ICOLD Conf. BALI 2014 - Lecture by Dr. Buselli on DMT - SDMT.|
|17 June||St. Petersburg Russia. Workshop on Flat Dilatometer & Seismic Dilatometer by D. Marchetti ay St. Petersburg Mining University.|
|2-14 July||Australia Brisbane, Newcastle, Adelaide, Melbourne. Workshops on DMT - SDMT by S. Marchetti.|
|1 Aug||Aalborg Denmark. Workshop on Seismic Dilatometer at University of Aalborg, Lecture by D. Marchetti: "Seismic Dilatometer: Description, Results and Applications" .|
|9-13 Sept||Goiania Brazil XII Brazilian Congress on Soil Mechanics & Geot. Engineering, COBRAMSEG 2014. Short Course on DMT - SDMT by D. Marchetti and Dr. Buselli.|
|22-23 Sept||Poznan POLAND 5th International Conference on CPT - DMT. Lectures by D. Marchetti, S. Marchetti, P. Monaco.|
|9 Oct||Pisa Workshop on in Situ Testing at Pisa University, Lecture by S. Marchetti: "Estimating Liquefaction Resistance taking into account Stress History by DMT".|
|11-12 Nov||Jakarta PIT-XVIII Geot. Eng. for Future Infrastructure Development in Indonesia. Lecture by Dr. Buselli "DMT and SDMT for Settlement Prediction of Shallow Foundations and Liquefability Evaluation".|
|12 Nov||Toronto Canada. Presentation on DMT/ SDMT by G. Sedran. Dinner-lecture Canadian Geotechnical Society - Toronto Branch.|
|18 Nov||Bologna Italy. One day Seminar on "In situ investigations"Viale della Fiera Sala BCD della Regione Emilia-Romagna. Sara Amoroso : DMT - SDMT Description of equipment. Results.|
|1 Dec||Concepcion Chile. Presentation on DMT - SDMT by D. Marchetti at "Universidad Catolica De La Santisima Concepcion" Auditorium.|
|2 Dec||Santiago Chile. Presentation on DMT - SDMT by D. Marchetti at " Pontificia Universidad Católica de Chile", Santiago Campus San Joaquín Av. Vicuña Mackenna 4860 Dpto. De Ingeniería Estructural y Geotécnica Sala DIEG, from 13:00 to 14:00.|
|4 Dec||Lima Peru Presentation on DMT - SDMT by D. Marchetti at "Colegio De Ingenieros Del Peru" Av. Arequipa Nº 4947 Miraflores, Lima.|
|3-5 Dec||Moscow Russian Geotechnical Conference. Presentation on DMT - SDMT on 3 Dec by S. Marchetti.|
|18-20 Dec||Kakinada Indian Geotechnical Conference IGC-2014. Presentation on DMT - SDMT at Plenary Session 18 Dec by S. Marchetti.|
|9-14 May||Santa Cruz Bolivia. Geotechnical Conference. Presentation on DMT - SDMT by S. Marchetti.|
|14-16 June||Rome Italy 3rd Intnl Conf. on the Flat Dilatometer DMT'15, www.dmt15.com. Under the auspices of Techn. Committee TC-102 of ISSMGE, of the Italian Geot. Society and L'Aquila University. Parco dei Principi.|
Using the DMT: The last decades have seen a massive migration from laboratory testing to in situ testing. In situ tests are fast, economical, reproducible, provide many data, have a small scatter, cost much less than sampling and testing. CPT and DMT are today considered practical and fast in situ tests for everyday design (see e.g. State of the Art at the last Geotechnical World Conference 2009). CPT is faster than DMT, hence, in simple jobs, it may be preferable and sufficient. However in important jobs, where accurate settlement predictions are needed, CPT may be not sufficient, because of the well known weakness of CPT to predict accurately settlements (e.g. Robertson 1986, Leonards 1988, Jamiolkowski 1988, Schnaid 2009). The slight additional cost of DMT has been found by many designers a fraction of the savings produced by a better designed foundation. DMT also provides better information on Stress History, which is important for settlements prediction and liquefaction evaluations. When used for monitoring compaction, the DMT's has been found to be twice as sensitive as CPT (Schmertmann 1986). The DMT is also considerably more sensitive to horizontal stresses. Due to the flat shape, arching is negligible, opposite to axi-symmetric probes, where arching obscures the horizontal stress.
Distinctive features of DMT:
The higher ability of DMT to predict settlements is due to:
DMT and SDMT:
September 2011 DMT automatic acquisition
Editorial July 2010 Direct-push in situ tests : will they be the basis of our investigations ? Can direct-push replace lab? Notions emerged at CPT'10. Differences CPT - DMT.
Sand liquefaction based on DMT
A recent KD-CRR correlation was obtained by Robertson in 2012. by replacing Qcn with 25 KD in the Robertson and Wride (1998) Qcn - CRR correlation. In 2006 Idriss and Boulanger (2006) updated the Robertson and Wride 1998 correlation - making it somewhat more conservative. By repeating the above mentioned substitution, i.e. replacing Qcn with 25 KD in the new consensus Idriss and Boulanger Qcn - CRR correlation, the following combination is obtained:
CRR = exp [(Qcn/540) + (Qcn/67)2 - (Qcn/80)3 + (Qcn/114)4 - 3] with Qcn =25 KD
The above equation is the today (2014) recommended correlation for predicting CRR based on KD.
Marchetti S. (1999) " The Flat Dilatometer and its applications to Geotechnical Design ", Lecture notes (90 pp) Intnl Seminar on DMT held at the Japanese Geot. Society, Tokyo, 12 Feb 1999 (pdf format 1.3 MB). Very detailed reference. Index: DMT equipment, Field equipment, Procedure, Derivation of parameters, Results, Distortions due to penetration, Comparisons with other tests, Coeff. of Consolidation & Permeability (clay), Settlements, Operative modulus, Detect slip surfaces in slopes, P-y curves for lat. loaded piles, Sand liquefaction, Compaction control, Pavement subgrade control, Subgrade Kh for anchored diaghrams, DMT for FEM.
READING HINTS . For a general overview, see the following comprehensive documents:
Readers unfamiliar with DMT: Totani et al. 2001 Bali, 6 pages (in Italian: Totani et al. 1999 Parma).
More detailed and extensive treatment : (a) In the form of paper : Marchetti 1997 Cairo and especially TC16 2001 Bali.
(b) In the form of a series of slides: Marchetti 1999 Tokyo, Marchetti 2001 Torino. (c) In the form of Course Notes - User's Manual: Course Notes 2001 Bali
Papers (of the above list) grouped by topic - all downlodable
Settlements and compressibility: Schmertmann 86, Lacasse 86, Leonards 88, Hayes 90, Iwasaki 91, Geopac 92, Jendeby 92, Woodward 93, Steiner 94, Tanaka 98, Failmezger 98-2000, Failmezger et al. 99, Pelnik et al.99, Schnaid et al 2000, Tice & Knott 2000
PMT and DMT : Schmertmann 87 Digest 9, Geopac 92, Kalteziotis 91, Lutenegger 88 and 90, Wong 93, Sawada 95, Ortigao 96, Schnaid 2000
Ch and K by DMT: Robertson 88, Schmertmann 88, Marchetti 89, Totani 98
Liquefaction: Marchetti 82, Robertson 86 , Reyna 91, Tanaka 98, Milestones on liquefaction 98, TC16 2001
For personal or educational non-commercial use only.
The documents *.pdf, require Acrobat Reader, freely downloadable at : http://www.adobe.com/products/acrobat/readstep.html