CV/Publications

PREVIOUS POSITIONS

Adjunct Professor, 2014 to 2021

Division of Geosciences and Environmental Engineering, Department of Exploration Geophysics, Luleå University of Technology, Sweden

Senior Consultant, 2014 to 2016

Division rock, Geosigma, Luleå Sweden

Senior Consultant, 2011 to 2014

Division of Geotechnical Engineering, Pöyry SwedPowed AB, Luleå, Sweden

Senior Consultant, 2005 to 2011

Vattenfall Power Consultant AB, Luleå Sweden

Senior Consultant, 2004 to 2005

SwedPower AB, Luleå Sweden

Graduate student Division of Engineering Geology and Geophysics, 1997 to 2004:

Institute de Physics du Globe de Paris

Cornell University

Lawrence Berkley National Laboratory

Consultant, 1988 to 2004

Various borehole investigations for Geosigma in Uppsala, Sweden, and rock stress measurements (measurement and interpretation) for Vattenfall Hydropower AB/SwedPower AB, Luleå, Sweden, and Institut de Physique du Globe de Paris, Paris, France.

POSITIONS OF TRUST

• 2008-2010, member of the rock mechanics group of Posiva Oy.
• 2007-2008, member of the IODP Engineering Development Panel, representing Europe.
• 2012-2019, Chairman Antnäs BK hockey
• 2012-2019, Vice Chairman/Chairman, Antnäs BK

MEMBERSHIP IN RESEARCH GROUPS/PROFESSIONAL SOCIETIES

• SDDP (Swedish Deep Drilling Program; 2007-3905)
• The Lund Cap Rock Test Site (2011-5976)
• COSC (Collisional Orogeny in the Scandinavian Caledonides)
• DAFNE (Drilling Active Faults in Northern Europe)
• ISRM (International Society of Rock Mechanics)

AWARDS

Recipient of the Manuel Rocha medal of the International Society of Rock Mechanics for best PhD thesis in rock mechanics year 2006.

PUBLICATIONS

Peer-reviewed articles in international journals

• Ask, D., Stephansson, O, Cornet, F.-H., Ask, M.V.S. Rock stress, rock stress measurements, and the integrated stress determination method (ISDM). Rock Mech. Rock Engng., 2009; 42: 549-584.
• Ask, D., Cornet, F.H., Fontbonne, F., Nilsson, T., Jönsson, L., Ask, M.V.S. A quadruple packer tool for hydraulic stress measurements in mines and other high stress areas. Int. J. Rock Mech. Min. Sci., 2009; 46:1097-1102.
• Ask, D. The Integrated Stress Determination Method and suggested measurement strategy - Rocha medal paper 2006. ISRM News Journal, Vol. 9, No. 3, 2006, pp. 25-27.
• Ask, D. Measurement-related uncertainties in overcoring rock stress data at the Äspö HRL, Sweden, Part 2: Biaxial testing of CSIRO HI overcore samples. Int. J. Rock Mech. Min. Sci., 43, 127-138, 2006.
• Ask, D. New developments of the Integrated Stress Determination Method and application to rock stress data at the Äspö HRL, Sweden. Int. J. Rock Mech. Min. Sci., 43, 107-126, 2006.
• Ask, D. Evaluation of measurement-related uncertainties in the analysis of overcoring rock stress data from the Äspö HRL: a case study. In Special Issue of the International Journal of Rock Mechanics and Mining Sciences: Stress Determination – IRSM Suggested Methods and Supporting Papers, 2003, pp. 1173-87.

Peer-reviewed conference proceedings

• Ask, M.V.S., Ask, D. Validating hydraulic fracturing data from the Lansjärv postglacial fault, North Sweden. Proc. 8th General Assembly of the European Geosciences Union, Vienna (Austria), 3-8 Apr 2011. (Abstract no EGU2011-13496; abstract and poster).
• Ask, D., Fontbonne, F., Brunet, C. Complete stress field determination in an inclined borehole at the Olkiluoto site, Finland. Joint inversion of hydraulic and en echelon data. Proc. 5th Int Symp. On in-situ rock stress, Xie F (Ed.), Beijing, China, CRC Press, 2010, 85-92.
• Ask, D., Sjöberg, J. In-situ stress measurements at large depth: Technical improvements of overcoring and hydraulic equipments. 3rd World Stress Map conference, Heidelberg, Germany, 2008.
• Ask, D., Cornet, F.-H. Strategy for in-situ stress measurements. Proc. 4th Asian Rock Mechanics Symposium, ARMS06, Singapore, 2006, pp. 99-107.
• Ask, M.V.S., Ask, D., R. Christiansson, 2006. Detection of borehole breakouts at the Forsmark site, Sweden. In M. Lu, C.C. Li, H. Kjörholt, H. Dahle. In-situ rock stress: measurement, interpretation and application: 79-86. Taylor & Francis Group: London, U.K.
• Sjöberg, J., Lindfors, U., Perman, F., Ask, D., Christiansson, R. Reliable stress assessment using measurements, observation and analysis. Proc. Int. Symp. on In-Situ Rock Stress, Trondheim, Norway, 2006, pp. 361-371.
• Ask, D. Application of the integrated stress determination method (ISDM) on hydraulic and overcoring rock stress data from the Äspö Hard Rock Laboratory (HRL), Sweden: A nouvelle approach. Proc. 1st General Assembly of the European Geosciences Union, Nice (France), 25-30 Apr 2004. (World Meeting Number 000 7368; abstract and poster).
• Ask, D., Stephansson, O. H ydraulic rock stress measurements in the Björkö meteoritic impact structure, Lake Mälaren, Sweden. Proc. 3rd International Symposium on rock stress-RS Kumamoto ’03, Kumamoto, Japan, 2003, pp. 115-21.
• Ask, D., Cornet, F.H., Stephansson, O. Integration of CSIR- and CSIRO-type of overcoring rock stress data at the Zedex Test Site, Äspö HRL, Sweden. 10th ISRM Congr. On Rock Mechanics, Johannesburg, 2003: SAIMM, 2003, pp. 63-8.
• Ask, D., Stephansson, O., Cornet, F.H. Analysis of overcoring rock stress data in the Äspö region. 38th US Rock Mech. Symp, Washington, 2001: A.A. Balkema Publ, 2001, pp. 1401-5.
• Ekman, D., Stephansson, O., and Cornet, F.H. Integrated stress analysis in the Äspö region. Proceeding of the 2nd Euroconference on WSM, Deformation and Stress in the Earth´s Crust, The Äspö Hard Rock Laboratory, Abstract, Sweden, KTH Högskoletryckeriet, 1999, 1 pp.
• Rutqvist, J., Tsang, C.-F., Ekman, D. and Stephansson, O. Evaluation of in situ hydromechanical properties of rock fractures at Laxemar in Sweden. Proc. 1st Asian Rock Mechanics Symposium, ARMS ’97, Seoul, Korea. A.A. Balkema publisher, 1997, pp. 619-624.

Peer-reviewed articles, book chapters, books

• Ask, D. Methodology for determination of the complete stress tensor and its variation with depths based on overcoring rock stress data. In: Rock Mechanics and Engineering, Vol. 1, (X.-T. Feng, Ed.). CRC Press/Balkema, 2016, pp. 245-265.
• Ask, D. Semi-integration of overcoring, hydraulic fracturing, convergence, and acoustic emission rock stress measurement data and analysis of core discing at the Olkiluoto site. Posiva Workreport 2011-16. [Can be downloaded from www.posiva.fi].
• Ask, D., Fontbonne, F., Brunet, C. Hydraulic rock stress measurements in drillholes OL-KR40 and ONK-PP125 at the Olkiluoto site. Posiva Workreport 2011-15. [Can be downloaded from www.posiva.fi ].
• Ask, D., Cornet, F.-H., Fontbonne, F., Brunet, C. Forsmark Site Investigation. Stress measurements with hydraulic methods in boreholes KFM07A, KFM07C, KFM08A, KFM09A, and KFM09B. SKB P-07-206, 2007, 1131 p. [Can be downloaded from www.skb.se].
• Ask, D., Cornet, F.-H., Fontbonne, F., Brunet, C. Oskarshamn Site Investigation. Stress measurements with hydraulic methods in borehole KLX12A. SKB P-report P-07-232, 2007, 229 p. [Can be downloaded from www.skb.se].
• Ask, D. Evaluation of hydraulic and overcoring stress measurements and application of the Integrated Stress Determination Method (ISDM) in boreholes KSH01A and KAV04A at the Simpavarp site. SKB P-report in press, 2007, 73 p. [Can be downloaded from www.skb.se].
• Ask, D. Evaluation of hydraulic and overcoring stress measurements and application of the Integrated Stress Determination Method (ISDM) in boreholes KFM01B, DBT-1 and DBT-3 and hydraulic stress data in boreholes KFM01A, KFM01B, KFM02A, and KFM04A at the Forsmark site. SKB P-report P-07-234, 2007, 96 p. [Can be downloaded from www.skb.se].
• Ask, D., Ask, M.V.S., 2007. Detection of potential borehole breakouts in boreholes KFM01A and KFM01B. Forsmark site investigation, SKB P-07-235, 55 pp. [Can be downloaded from www.skb.se].
• Sjöberg, J., Lindfors, U., Perman, F., and Ask, D. Evaluation of the state of stress at the Forsmark site. SKB R-05-35, 2005, 128 p. [Can be downloaded from www.skb.se].
• Ask, D., Cornet, F.-H., and Stephansson, O. Analysis of overcoring rock stress data in the Äspö HRL. Analysis of overcoring rock stress data using the Borre Probe. SKB report IPR-04-05, 2004, 81 p. [Can be downloaded from www.skb.se].
• Ask, D., Cornet, F.-H., and Stephansson, O. Analysis of overcoring rock stress data in the Äspö HRL. Analysis of overcoring rock stress data using the CSIRO HI. SKB report IPR-04-06, 2004, 122 p. [Can be downloaded from www.skb.se].
• Zang, A., Stephansson, O. Stress Field of the Earth Crust. Springer Dordrecht Heidelberg London New York, 2010. Published material cited in book multiple times and appearing in 5 out of 18 movies in the accompanying DVD.

Popular scientific articles

• Sjöberg, J., Ask, D. Ny utrustning för hydrauliska spänningsmätningar och spänningskalibrering med tredimensionell numerisk modellanalys. Proc. of Fjellsprengningsteknikk/Bergmekanikk/Geoteknikk 2008, Kristiansen J., Engen A., Groneng G, Berg K.R. (Eds), Norsk ord og Fjellteknisk Forbund, 2008.
• Ask, D. Ny metod för spänningsanalys tillämpad vid Äspö HRL. Article presented at Rock Mechanical meeting in Stockholm, Mars 14th, 2005 (Ed. C. Bachman). SveBeFo, ISSN 0281-4714, Stockholm, p. 39-61.
• Ekman, D., Rutqvist, J. and Ljunggren, C. Determination of hydromechanical parameters down to 1 340 m depth in borehole KLX02 in Laxemar, Sweden. Paper presented at Rock Mechanics Meeting in Stockholm March 12, 1997 (Ed. C. Bachman). SveBeFo, ISSN 0281-4714, Stockholm, 1997, pp. 39-61.

MAJOR TOOL DEVELOPMENTS

• Development of specialized pressure release valve for large scale hydraulic fracturing straddle packers (2020).
• Development of a new stress monitoring cell, denominated Borre Mon, which involves a low cost installation methodology (2020-2021).
• Upgrading the LTU electrical imaging tool to include digital data transfer in long geophysical cables (2020).
• Development of a scientific, ultra-deep measurement system for hydraulic rock stress measurements, denominated the LTU Stress Trailer. A wire-line activated system using in-house developed straddle packers for NQ, HQ, and PQ-sized boreholes capable of testing down to 3 km depth using real-time electrical imaging (2014-2018).
• Development of a wire-line activated packer system based on depth correlation using gamma ray (2014).
• Development of stress monitoring system based on CSIRO HID overcoring cells (2013).
• Development of a conventional B116 overcoring testing equipment based on the Borre III cell (2013).
• Development of a miniature wire-line hydraulic testing system with depth capacity 150 m (2012).
• Development of a wire-line packer system (a quadruple packer) capable of testing with 700 bars overpressure (2007).
• Development of a wire-line hydraulic testing system based on the use of electrical imaging. Depth capacity 1500 m (2006).