Dynamic behaviour of high speed railway bridges with ballasted tracks
Loss of slope stability on railway tracks and its sanation · Loss of slope stability on railway...
Transcript of Loss of slope stability on railway tracks and its sanation · Loss of slope stability on railway...
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Loss of slope stability on railway tracks and its sanation
Petr
Černoch
AGE a.s. -
applied geotechnics and ecology, Czech Republic
XVIII EYGEC, Ancona
/ Portonovo, Italy –
June 17-20, 2007
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Structure of the lecture
Description
of each case
location – maprailway track – cutting / embankmentgeology – profile / conditionslandslide – causessolution – sanation
Case studies
based on experience in situ
JenišovČeské BudějoviceVeselí n. Lužnicí
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1. JENIŠOV –
locationsouth west of Bohemianearby border with Austriaalongside water reservoir Lipno
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1. JENIŠOV –
railway track and geologyrailway track – cutting
800 m long5 to 7 m deepinclination approx. 45°
geological profile – km 61.900; EC-7humic soilclayey sands with fragments of bedrockbedrock – biotitic gneisses and granulites
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1. JENIŠOV –
landslide causesoriginal drainage system damaged in the course of time
winter 2006 – heavy rains=> water accumulation between
sands and bedrock
photo: P. Novotný photo: P. Novotný
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1. JENIŠOV –
sanationsetting up a gabion retaining wall recovering the drainage system
(drain ribs, ditch)
photo: P. Novotný photo: P. Novotný
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2. ČESKÉ
BUDĚJOVICE –
locationsouth of Bohemiamain connection between Czech Republic and Austria
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2. ČESKÉ
BUDĚJOVICE –
railway track and geologyrailway track – cutting
100 m long5 to 7 m deepinclination approx. 45°bottom – old retaining wall
geological profile – km 211.380; EC-7humic soilclayey gravel sands with bouldersimpermeable clays (stiff consistency)occasional springs
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2. ČESKÉ
BUDĚJOVICE –
landslide causesexcavation for cable harness
poorly compacted => water ran through the slope
and not on the surface
spring 2006 – spring thaw=> water accumulated above
underlying impermeable layers
photo: P. Novotný photo: P. Novotný
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2. ČESKÉ
BUDĚJOVICE –
sanationsubstitution of the old wall by a new gabion retaining wall
construction of a drainage systemrelocation of the cable harness
photo: R. Smolík
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3. VESELÍ
N. LUŽNICÍ
–
locationsouth east of Bohemiarailway track from České Budějovice to Pragueflat landscape with rivers and ponds
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geological conditionstertiary basin – flood plainsediments – kaolin clays, sandscovered by Qrternary sands, loams
railway track – embankment500 m longup to 4 m highapprox. 35° steep
3. VESELÍ
N. LUŽNICÍ
–
railway track and geology
photo: P. Novotný
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3. VESELÍ
N. LUŽNICÍ
–
landslide causesembankement body during floods
acts as a barrier / damwater flow possible through the bridges
in 1980s main bridge destroyed and filled up
=> during floods in 2002 and 2006 deformations appeared
photo: P. Novotný
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3. VESELÍ
N. LUŽNICÍ
–
sanationplan
surface water-protectionconstruction of a small culvert
realityonly embankment body restorationproblems will probably last
photo: P. Novotný
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Conclusions
Loss of slope stability on railway tracks can be prevented mainly by:
knowing the natural conditions based on qualitygeological research
designing the right technological procedures
complying with them throughout the construction
maintaining the existing drainage system
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Thank you for your attention
ContactPetr ČernochAGE a.s., Czech [email protected]+420 222 714 962 AGE a.s. - applied geotechnics and ecology