Publication details
Some structural geology findings from the construction railway corridor IV (Moldanubian, Bohemian Massif)
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| Year of publication | 2016 |
| Type | Conference abstract |
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| Description | 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 ?1 136/4, ?2 44/26 and ?3 324/64 and the value of the Lode parameter -0.41; the second phase orientation ?1 31/5, ?2 129/62 and ?3 298/28 and the value of the Lode parameter +0.06. Third, much less distinct phase, with the orientation of ?1 150/63, ?2 29/15, ?3 292/22 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 ?1. Inclination ?3 is steep toward to the SE. Major normal stress ?2 is slightly sloping to the W. Deformation Phase 2 is characterized by sub-horizontal inclination ?2 toward the NNW, slightly sloping tension ?1 for SSE and normal stress ?3 is steeply dipping to the east. Deformation Phase 3 is the smallest normal stress ?3 a slight bow toward VSV, subhorizontal ?2 heading to the northwest and the largest stress ?1 has a southwesterly direction with an inclination of 73 degrees. The maximum compressive stress of deformation phase 4 ?1 directed the deformation phase to the west with slope of 42 degrees, the relative direction of extension ?3 is to the northeast with slight inclination of 22 ° and stress ?2 is oriented 146/40. |