Hans-Detlef Krey

Hans-Detlef Krey (born October 8, 1866 in Osterbünge, near St. Margarethen , Schleswig-Holstein , † July 15, 1928 in Berlin ) was a German pioneer of soil mechanics .

Krey was a farmer's son, attended the Christianeum in Altona and, after graduating from high school in 1886, studied civil engineering at the Technical University of Munich . After graduating in 1891, he first worked for a construction company in Berlin, but then switched to civil service . In 1896, after several years of apprenticeship on hydraulic engineering projects , he got a permanent job as an engineer and worked first on the North Sea coast, from 1901 in Berlin. There he was also assistant to Heinrich Müller-Breslau at the TU Berlin . Krey was then entrusted with sewer construction tasks and transferred to Lünen in Westphalia . For example, he was involved in early preparatory work on the Mittelland Canal . In 1910 he was back in Berlin as head of the newly founded research institute for hydraulic engineering and shipping , which he systematically expanded from small beginnings. In 1912 his soil mechanics textbook appeared in the first edition, the first edition of which went beyond the textbook by Müller-Breslau (earth pressure on retaining walls, 1906) and, for example, dealt with piles and sheet pile walls (its name is also the same as that dealt with in his book Slip circle method ). Under his direction, a separate soil mechanics department was established in the research institute in 1927, where early shear devices (ring shear devices ) were developed by his colleague B. Tiedemann . Krey and Tiedemann discovered the dependence of cohesion on the load history. Another employee from 1927 was Johann Ohde , who carried out experiments on earth pressure on retaining walls and measured it. In 1921 Krey became a senior councilor and in 1927 honorary professor at the TU Berlin.

In 1920 he received an honorary doctorate from the Technical University of Dresden . In 1928 he became a member of the Academy for Construction.

Fonts

• Earth pressure, earth resistance and load-bearing capacity of the subsoil , 1912, 5th edition with Joachim Ehrenberg, Ernst & Sohn , Berlin 1936 (the book arose from an article in the Zeitschrift für Bauwesen , volume 62, 1912, p. 95)
• Broken and curved sliding surfaces in earth pressure tasks , Bautechnik , Volume 4, 1926, p. 279

literature

• Ludin: Senior building officer Dr. Krey †. In: Die Bautechnik , Volume 6, Issue 40 (September 14, 1928), p. 595.
• Hans Jaeger:  Krey, Hans. In: New German Biography (NDB). Volume 13, Duncker & Humblot, Berlin 1982, ISBN 3-428-00194-X , p. 33 ( digitized version ).
• Edgar Schultze : Hans-Detlef Krey and the experimental approach to soil mechanics , Geotechnique, Volume 4, 1954, p. 93
• Achim Hettler and Karl-Eugen Kurrer : Earth pressure . Ernst & Sohn, Berlin 2019, ISBN 978-3-433-03274-9 , pp. 321–322

Individual evidence

1. ↑ In 1937 he published an essay on the shear strength of cohesive soils in structural engineering, in which, among other things, he discovered the lower residual shear strength after the sliding process began.
2. ↑ Honorary doctoral students of the TH / TU Dresden. Technical University of Dresden, accessed on February 7, 2015 .