Mr Jeroen Dijkstra, TC211 member, Manager of the Geotechnical Department at Cofra
Jeroen Dijkstra is Manager of the Geotechnical Department at Cofra (Boskalis) and a ground improvement specialist with almost 25 years of international ground improvement experience. He has been working with the Rapid Impact Compaction (RIC) hammers for over 20 years and has contributed to major infrastructure, port, airport, and land reclamation projects across Europe, the Middle East, Asia, and Australia. As an active member of ISSMGE TC211, Jeroen regularly shares his expertise through international conferences, technical publications, and industry workshops.
![Soil reinforcement under existing structures and underpinning (in French) {"category":"webinar","subjects":["Ground Improvement", "Foundation Design/Construction", "Reinforced Fill Structures"],"number":"CFMS-01","instructors":["Bruno Mazaré"]}](/asset-v1:ISSMGE+CFMS-01+2025+type@asset+block@webinar1.jpg)
![Concept and Parameters, Latest Research in Ground Improvement Illustrated by Related Case Histories {"category":"webinar","subjects":["Ground Improvement"],"number":"VU-GI","instructors":["Serge Varaksin","Noel Huybrechts"]}](/asset-v1:ISSMGE+GI101+2013+type@asset+block@pic1.jpg)
![Intelligent Compaction {"category":"webinar","subjects":["Ground Improvement", "Soil Mechanics"],"number":"GI102","instructors":["Antonio Correia","George Chang"]}](/asset-v1:ISSMGE+GI102+2011+type@asset+block@pic5.jpg)
![State of the Art Jet Grouting Method {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-02","instructors":["Tsutomu Tsuchiya"]}](/asset-v1:ISSMGE+TC211-02+2023+type@asset+block@intro-slide.jpg)
![Dynamic Compaction State-of-the-Art {"category":"webinar","subjects":["Deep Dynamic Compaction", "Ground Improvement"],"number":"TC211-04","instructors":["Babak Hamidi"]}](/asset-v1:ISSMGE+TC211-04+2024+type@asset+block@tc211-04-webinar.png)
![Use of Rigid Inclusions for Foundations of Container Yards {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-05","instructors":["Jian CHU"]}](/asset-v1:ISSMGE+TC211-05+2024+type@asset+block@WS_5_01_TC211_Workshop_JChu.png)
![Origin and development of rigid inclusions in Portugal. Main challenges and perspectives for the future {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-06","instructors":["Antonio Cristóvão"]}](/asset-v1:ISSMGE+TC211-06+2024+type@asset+block@TC211_WS_02_ACristovao.jpg)
![Overview of future Eurocode 7 with focus on the new clause on ground improvement {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-07","instructors":["Karolina Trybocka"]}](/asset-v1:ISSMGE+TC211-07+2024+type@asset+block@TC211_WS_03_KTrybocka.png)
![Polish recommendations for ground improvement with rigid inclusions – Design, Execution, Quality control {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-08","instructors":["Michał Topolnicki"]}](/asset-v1:ISSMGE+TC211-08+2024+type@asset+block@TC211_WS_04_MTopolnicki.jpg)
![The use and codification of Rigid Inclusions in the US {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-09","instructors":["Sonia Sorabella Swift"]}](/asset-v1:ISSMGE+TC211-09+2024+type@asset+block@WS_5_05_TC211_Workshop_SSwift.png)
![Learnings (in static and seismic conditions) from the French national ASIRI+ project {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-10","instructors":["Jesús Pérez"]}](/asset-v1:ISSMGE+TC211-10+2024+type@asset+block@WS_5_06_TC211_Workshop_JPerez.png)
![New Insights on the Seismic Response of Rigid Inclusions considering Strength and Stiffness Degradation of Grout and Improved Numerical Boundary Conditions {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-11","instructors":["Armin W. Stuedlein"]}](/asset-v1:ISSMGE+TC211-11+2024+type@asset+block@07_WS_5_07_TC211_Workshop_AStuedlein.png)
![Overview of rigid inclusion design in Germany. Focus on the LTP interaction and on the CO2 consumption {"category":"webinar","subjects":["Ground Improvement"],"number":"TC211-12","instructors":["Christopher Tinat", "Birthe Knabe"]}](/asset-v1:ISSMGE+TC211-12+2024+type@asset+block@WS_5_08_TC211_Workshop_BKnabeCTinat.png)
![Numerical Analysis of Ground Improvement {"category":"webinar","subjects":["Numerical Analysis", "Ground Improvement"],"number":"TC211-15","instructors":["Helmut F Schweiger"]}](/asset-v1:ISSMGE+TC211-15+2025+type@asset+block@Technical-Photo-tc211-15.jpg)
![TC-211 5th Louis Menard Lecture: Ground Improvement of Large Tanks Using Innovative Dynamic Replacement Techniques {"category":"honour_lecture","subjects":["Ground Improvement"],"number":"TC211-16","instructors":["Serge Varaksin"]}](/asset-v1:ISSMGE+TC211-16+2026+type@asset+block@tsing-yi-tripode-01.JPG)