overview on geo 3d project improvement of the tbm tunneling process by using real time information...
TRANSCRIPT
Overview on Geo 3D Project
Improvement of the TBM tunneling process by using real time information
Constantin Radu GoguDaniel MonfortVioleta VelascoJordi Font-Capó
Enric Vázquez – SuñeJesús Carrera
GRUPO HIDROLOGÍA SUBTERRÁNEA (UPC)
UPC, November 6, 2008
Content :
- Project goal
- Current trends and situation
- Project overview
- Modeling integrated scheme
- Conclusions & Discussions
Geo 3D - Improvement of the TBM tunneling process by using real time information
Improvement of the TBM tunneling process by real time updating of the geological and of the hydrogeological model, using real time information concerning the geological materials and the hydrogeological and deformation behavior registered during the excavation of the tunnel.
Geo 3D - Improvement of the TBM tunneling process by using real time information
Ideal objective
Project goal
Geo 3D - Improvement of the TBM tunneling process by using real time information
Project goal
Visualization of the geological model (control cabin) continuously updated function of the observations and the tunneling process recorded parameters:
- excavated material type (granulometry and mineralogy),
- hydrogeological parameters (hydraulic conductivity, hydraulic head, fluxes)
- mechanical resistance (cohesion, friction angle)
- soil deformation
Geo 3D - Improvement of the TBM tunneling process by using real time information
Idea
Project goal
Advantage
- Normal conditions: the machine parameters could have an optimal adjustment
- Identification of problematic zones: the excavated material does not coincide with predicted
Geo 3D - Improvement of the TBM tunneling process by using real time information
Project goal
- study and model the hydrogeological parameters the geological information could be really improved
- few applications of groundwater behavior related to tunneling aspects can be found in the literature.
- Hydrogeological parameters are analyzed or modeled to study:
● seepage effects,
● pressures to determine the subsidence, tunnel ring deformations, longitudinal displacements and related consequences.
- Analysis usually is performed to study the execution aspects or the tunnel behavior in time and less for geology prediction.
Geo 3D - Improvement of the TBM tunneling process by using real time information
Existing situation
Current trends and situation
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
How works the tunneling process ?
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
Ptop
Applied Pressure at the Tunnel Face
Natural Pressure at the Tunnel Face
Fconf FwaterFground
Confinement Pressure gradient
How works the tunneling process ?
Pressures interacting on the tunnel face
Geo 3D - Improvement of the TBM tunneling process by using real time information
Approximate settlement ranges observed in tunneling excavated in granular media
Current trends and situation
50% - 80% 0 - 25%
~ 2-3 dias
0 - 25%
Levantamientos
Asientos Escudo
How works the tunneling process ?
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
How works the tunneling process ?
2
2
2
2
max 2exp
22exp)(
i
y
i
V
i
ySyS s
S(y)
H
y
Smax
i
R
Geometry of the settlement produced by tunnel excavation expressed by the Gaussian curve
with the transition point i = K ×H, where K - ground coefficient; H – Vs – volume of the settlement
Subsidence produced by the tunnel excavation (Peck, 1969)
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
Study case - Emeriault and Kastinger (2008)
CPI 2
CPI 1
2.25
0.75
5.50
7.48
11.00
Top of the molassesWater level
Ground level
evolution of pore pressures in two cells installed in the tunnel axis:
- located within the tunnel boring machine pass (CPI2) and was destroyed during excavation -located at 0,75 m above the tunnel crown (CPI1).
- homogeneous geology (Toulouse molasses: hard sandy clay with pockets and lenses of very dense sand)
- homogenous geotechnical characteristics - the average cover ranges between 10 and 20 m - groundwater table 4 m below ground level.
Current trends and situation
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
Study case - Yamamoto et al. (2003)
- system using geostatistics to evaluate the geological conditions ahead and surrounding of the tunnel face simultaneously with excavation
- relationships between drill energy coefficient in the region ahead of the face of the tunnel derived from the drill logging data and the excavating energy or the rock mass strength
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
Study case - Yamamoto et al. (2003) The amount of energy required to bore a unit volume of ground “drilled energy coefficient :Ev = (E×N)/(V×A) E – drill energy per strike
N – striking times/sec V – drilling speedA – area of cross-section
The rock mass strengthσc(F) = F/(C1×Pe) σc(F) – rock mass strength
F – thrust loadPe– penetrationC1– constant
The excavating energy Qv = F/A + 2π N×Tr/(A×V) Qv– excavation energy
F – thrust loadA – area of cross-sectionN – cutter revolutions/minTr – cutter torqueV – excavating speed
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
Study case - Yamamoto et al. (2003)
Evaluating the geological conditions - made in three steps:
- the drill energy coefficient derived from drill logging at each measuring location ahead of the face was converted into excavating energy and rock mass strength based on a predetermined correlation coefficient
- the spatial distribution of these converted values was modeled using the mean function and the covariance function of the spatial structure
- the kriging method was used to estimate the distributions of the rock mass strength and the excavating energy of the area ahead of the face.
Geo 3D - Improvement of the TBM tunneling process by using real time information
Current trends and situation
Study case - Yamamoto et al. (2003)
- data collection: a large campaign of geophysical and hydrogeological field tests made before, during, and after the tunnel excavation;
- development a hydrogeological model simulating the aquifer behavior during and after the tunnel execution;
- studying the entire set of parameters provided by the tunneling machine during the excavation process together with the variables resulted during the field tests and the hydrogeological models outputs;
- design and the development of a 3D geological spatial data platform designed to manage spatial and temporal data.
Geo 3D - Improvement of the TBM tunneling process by using real time information
Working directions
Project overview
Geo 3D - Improvement of the TBM tunneling process by using real time information
Data collection
Project overview
Geo 3D - Improvement of the TBM tunneling process by using real time information
Data collection
Project overview
Cota (m) Profundidad (m) Cota tubo ranurado (m)
Distancia eje túnel (m)
Pou 1 5.50 30 Ranurado hasta cota -24.5
8
Pou 2 5.50 30 Ranurado hasta cota -24.5
8
SPA-1 5.31 30 Entre -20 y -24 8
SPA-2 5.50 30 Entre -20 y -24 8
SPA-3 5.465 15 Entre -4.5 y -8.5 12
SPA-4 5.42 20 Entre -7.5 y 12.5 13
SPA-5 5.34 20 Entre -9.5 y -13.5 13
SPA-6 5.335 15 Entre -4.5 y -8.5 12
Geo 3D - Improvement of the TBM tunneling process by using real time information
Data collection Nivells pas túnel
1
1.5
2
2.5
3
3.5
21/03
/2008
00:00
21/03
/2008
02:24
21/03
/2008
04:48
21/03
/2008
07:12
21/03
/2008
09:36
21/03
/2008
12:00
21/03
/2008
14:24
21/03
/2008
16:48
21/03
/2008
19:12
21/03
/2008
21:36
22/03
/2008
00:00
temps
Niv
ell
msn
m
CiclesEPBPA3
PA4
PA5
PA6
Posició front +2.4 m secció PA1-PA2
Posició +9.6 m secció PA1-PA2
Posició +13.6m secció PA1-PA2
745 755
Posició -11.8 m secció PA1-PA2
Posició -1m secció PA1-PA2
Col·locació anellArrencada màquina
Project overview
Geo 3D - Improvement of the TBM tunneling process by using real time information
Data collection Piezòmetres PA1 i PA2
-1.5
-1.3
-1.1
-0.9
-0.7
-0.5
-0.3
-0.1
0.1
0.3
0.5
21/0
3/20
08 0
0:00
21/0
3/20
08 0
4:48
21/0
3/20
08 0
9:36
21/0
3/20
08 1
4:24
21/0
3/20
08 1
9:12
22/0
3/20
08 0
0:00
22/0
3/20
08 0
4:48
22/0
3/20
08 0
9:36
22/0
3/20
08 1
4:24
22/0
3/20
08 1
9:12
23/0
3/20
08 0
0:00
Temps
Pro
f. m PA1
PA2
Cicles EPB
Col·locació anellArrencada màquina
-11.8m secció PA2-PA1
+18.6 m secció PA2-PA1
+13.6m secció PA2-PA1
-1m secció PA2-PA1
Project overview
Geo 3D - Improvement of the TBM tunneling process by using real time information
TMB parameters
Current cross-section Recorded vs Predicted
estimated parameters
Analysis Management Visualization Software Platform installed on the TBM
Geological / Geotechnical parameters at the excavation section
(ex. estimated excavating energy, soil strength)
Geological / Geotechnical parameters on the excavation-section - (ex.
estimated soil strength, excavating energy)
Updating the parametres
3D tunnel graphic animation
3D Tunneling model(3D geological model & the tunnel
trajectory)
Deriving the parametres
Updating the model
Initial geological & Hydrogeological Data
Geospatial Database interface (Spatial/Time dependent query and visualization)
3D Interpreted geological Data
Tunnel technical parametres
Hydrogeological & Deformation modeling software (Code Bright)
3D Geologic model
Piezometry and Deformation daily data entry
Soil Displacements
3D Geologic modeling software (gOcad)
TMB parameters
Geo 3D - Improvement of the TBM tunneling process by using real time information
Modeling integrated scheme
3D - Visualization software tests
Geo 3D - Improvement of the TBM tunneling process by using real time information
Modeling integrated scheme
3D - Visualization software tests
Geo 3D - Improvement of the TBM tunneling process by using real time information
Modeling integrated scheme
3D - Visualization software tests
Geo 3D - Improvement of the TBM tunneling process by using real time information
Modeling integrated scheme
3D - Visualization software tests
Geo 3D - Improvement of the TBM tunneling process by using real time information
Conclusions & Discussions
Before the excavation of a tunnel, only surface exposures and boreholes are usually used to assess the geology and the lithology. Their results are extrapolated to the designed tunnel and its surrounding area.
An accurate hydrogeological analysis provides trustful information on the geological characteristics. Because they are time and effort consuming the hydrogeological assessment techniques are almost unused in characterizing the tunneling conditions.
Geo 3D - Improvement of the TBM tunneling process by using real time information
Conclusions & Discussions
Future analyzing and modeling data in tunnel activity will be taken by software platforms combining the two software types: GIS and CAD. GIS packages and spatial databases will be used manage and visualize spatial data and the geological spatial models are build in dedicated 3D CAD applications.
A prediction model to give fast responses for the lithological uncertainties in the proximity of the tunnel face, could be by focusing the quantification procedure of the soil mass strength and the excavation energy by using soil lithological properties. These two parameters derived from the lithological properties can be compared with the same parameters derived from the TBM.
Geo 3D - Improvement of the TBM tunneling process by using real time information
General - more complex test site- other lithological distribution with more contrasted
characteristics- …. better.. a problematic test site
Geophysics - a deeper electric tomography- seismic tomography- diagraphy
Conclusions & Future work
Data acquisition
Stratigraphy - accurate and detailed granulometry
Geotechnics - geotechnical data acquisition and laboratory tests
Geo 3D - Improvement of the TBM tunneling process by using real time information
Tunneling machine data - data machine parameters with a shorter time step (min)
Excavated material - take more samples on each excavated section
Conclusions & Future work
Data acquisition
Soil deformation data - shorter time step- real time data acquisition system
Geo 3D - Improvement of the TBM tunneling process by using real time information
Data analysis - this experience was a learning process - improve data analysis by relating the recorded parameters: (ex. – pressure of injection / hydraulic heads; granulometry/ TMB parameters, etc)- compare soil resistance (CPTU) with TBM parameters (F,M)
Conclusions & Future work
Modeling - model the groundwater flux and soil deformation - model 3D is necessary- Geostatistics / ANN (software platform)
Thank you for your attention !
The civil engineers forgot about groundwater !
Geo 3D - Improvement of the TBM tunneling process by using real time information
Conclusions & Discussions
Not in terms of existence (because it produces a lot of problems … for them)
But … in terms of extracting information !
It means by using groundwater data to better quantify the geological information.