Some structural geology findings from the construction railway corridor IV (Moldanubian, Bohemian Massif)

KNÍŽEK, Martin, Klára DUDINSKÁ and Milan KÖSSLER. Some structural geology findings from the construction railway corridor IV (Moldanubian, Bohemian Massif). In Central European Tectonic Groups Annul Meeting - CETeG 2016. 2016. ISBN 978-80-223-4071-7.

Basic information

• Original name: Some structural geology findings from the construction railway corridor IV (Moldanubian, Bohemian Massif)
• Authors: KNÍŽEK, Martin, Klára DUDINSKÁ and Milan KÖSSLER.
• Edition: Central European Tectonic Groups Annul Meeting - CETeG 2016, 2016.

Other information

• Original language: English
• Type of outcome: Conference abstract
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• Organization unit: Faculty of Science
• ISBN: 978-80-223-4071-7
• Tags: International impact

Abstract

In the modernization of railway corridor IV between Prague and České Budějovice is planned 10 new tunnels. Currently is completed and in operation five tunnels between Bystřice u Benešova and Votice stations and one more near Sudoměřice u Tábora. Total length of tunnels is over 3000 m. In the future, we are planning two shorter tunnels close to Mezno and two long tunnels near Hluboká nad Vltavou. During the construction of the tunnels it was possible to obtain a wide range of data and precise information about the geological structure at the eastern edge of the Bohemian Plutonic Complex. In discontinuities in open cuts and in tunnel excavation were carried out data collections for paleostress analysis based on measurement of fault surfaces and striations including the determination of the sence of movement. Analysis was performed in the program MARK (Kernstocková, Melichar 2011). By analyzing data from near Votice were identified two main phases (Fig. 1): the first phase with the orientations of the principal normal stresses σ1 136/4, σ2 44/26 and σ3 324/64 and the value of the Lode parameter -0.41; the second phase orientation σ1 31/5, σ2 129/62 and σ3 298/28 and the value of the Lode parameter +0.06. Third, much less distinct phase, with the orientation of σ1 150/63, σ2 29/15, σ3 292/22 and with value of the Lode parameter +0.6. Individual stages are not named according to the time sequence. Near Sudoměřice u Tábora was made data collection of few faults with striations. Paleostress analysis showed 4 phases of stress. Deformation Phase 1 is reflected by almost sub-horizontal inclination of the maximum compressive stress σ1. Inclination σ3 is steep toward to the SE. Major normal stress σ2 is slightly sloping to the W. Deformation Phase 2 is characterized by sub-horizontal inclination σ2 toward the NNW, slightly sloping tension σ1 for SSE and normal stress σ3 is steeply dipping to the east. Deformation Phase 3 is the smallest normal stress σ3 a slight bow toward VSV, subhorizontal σ2 heading to the northwest and the largest stress σ1 has a southwesterly direction with an inclination of 73 degrees. The maximum compressive stress of deformation phase 4 σ1 directed the deformation phase to the west with slope of 42 degrees, the relative direction of extension σ3 is to the northeast with slight inclination of 22 ° and stress σ2 is oriented 146/40.