R.GRANDORI- SELI spa 1

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1 R.GRANDORI- SELI spa 1

2 THE MARKET DEMANDS LONG LARGE DIAMETERS TUNNELS IN ROCK FORMATIONS FOR RAILWAYS TUNNELS FOR ROAD TUNNELS R.GRANDORI- SELI spa 2

3 LARGE DIAMETERS TUNNELS CHANGE THE TBM TYPES APPLICATION RANGE OPEN TYPE TBMS (ONLY SPECIAL APPLICATION IN EXCELLENT ROCK) DOUBLE SHIELD AND SINGLE SHIELD TBMS (VERY GOOD TO FAIR FORMATIONS) DSU TBMS (VERY GOOD TO VERY POOR HIGH COVER & SQUEEZING GROUND) SPECIAL EPB DUAL MODE TBMS (LOW COVER ALTERNATING WEAK ROCK TO SOIL FORMATIONS) R.GRANDORI- SELI spa 3

4 NEW TBMS TYPES DEVELOPED FOR THE NEW MARKET DEMAND DOUBLE SHIELD UNIVERSAL TBMS FAMILY EPB DUAL MODES WITH ADVANCED CONDITIONING SYSTEM + FINE COMPENSATION SYSTEMS + ROCK COPY CUTTERS R.GRANDORI- SELI spa 4

5 DSU TBMS FAMILY BASIC DESIGN CONCEPTS SHIELDS LENGTH SHORTER THAN SINGLE SHIELD (APPROX. 10 M) EXTENDED OVERCUTTING FACILITIES REAR SHIELD DIAMETER MUCH SMALLER THAN FRONT SHIELD NEW TELESCOPIC ARTICULATION DESIGN WITH NO STEP-BACK JOINT HIGH MAIN & AUXILIARY THRUST EXTENDED FACILITIES FOR FACE GROUND TREATMENTS R.GRANDORI- SELI spa 5

6 DSU TBM FAMILY COMMONN OPERATIONAL FEATURES UP TO 60 M/DAY TUNNELING CAPACITY DOUBLE SHIELD MODE IN WEAK ROCK NO SENSIBLE TO SQUEEZING GROUND EFFECTIVE FACE STABILIZATION R.GRANDORI- SELI spa 6

7 DSU TBMS FAMILY THE DSU TBM FAMILY DSU RS TYPE ROCK SUPPORT DSU CP TYPE COMPACT DSU GT TYPE GROUND TREATMENT DSU EPB TYPE EPB DUAL MODE R.GRANDORI- SELI spa 7

8 DSU ROCK SUPPORT FOR FLEXIBLE LINING DESIGN -NATM SUPPORTS (SHOTCRETE, ROCK BOLTS) -SEGMENTAL LINING -NO SUPPORT R.GRANDORI- SELI spa 8

9 DSU COMPACT TBM SYSTEM FOR SMALL DIAMETER SHORT TUNNELS TOTAL LENGTH SHORTER THAN 60M 1 WEEK ASSEMBLY/DISASSEMBLY TYPE ONLY 3 PERSONS OPERATING CREW EASY AND UNEXPENSIVE TRANSPORTABILITY R.GRANDORI- SELI spa 9

10 DSU EPB DUAL MODE FOR ROCK ALTERNATE WITH SOILS DOUBLE SHIELD CONFIGURATION (BELT CONVEYOR) EPB CONFIGURATION (SCREW CONVEYOR + BELT CONVEYOR) TWO POSSIBLE DESIGN ARRANGEMENT SCREW CONVEYOR ONLY- FOR TUNNEL MAINLY IN WEAK/SOIL FORMATIONS DUAL CONVEYOR (SCREW OR BELT)- FOR TUNNEL WITH HARD ROCK SECTIONS R.GRANDORI- SELI spa 10

11 DSU GROUND TREATMENT HIGH COVER SQUEEZING & CAVING GROUND TUNNELS TREATMENT CAPACITY THROUGH THE SHIELD 7 INCLINED PILING THROUGH THE SHIELD 18 INCLINED PILING THROUGH THE HEAD PIPING/GROUTING RADIAL COLLAR GROUTING AROUND CUTTEHERAD R.GRANDORI- SELI spa 11

12 ABDALAJIS TUNNEL EST THE DSU TBM CHALLENGE R.GRANDORI- SELI spa 12

13 ABDALAJIS TUNNEL ALIGNEMENT VERTICAL ALIGNMENT END OF TUNNEL START OF TUNNEL TUNNEL LENGTH = R=7900 m R=6955 m HORIZONTAL ALIGNMENT R.GRANDORI- SELI spa 13

14 ABDALAJIS TUNNEL SEGMENTAL LINING DESIGN R.GRANDORI- SELI spa 14

15 TBM AND BACK UP ASSEMBLED AT TUNNEL PORTAL R.GRANDORI- SELI spa 15

16 ABDALAJIS DSU GT TBMS TREATMENT CAPACITY 28-7 INCL.DEEP PILES INCL. DEEP PILES 63- FACE PIPES FOR GROUT 38- COLLAR PIPES FOR GROUT R.GRANDORI- SELI spa 16

17 ABDALAJIS KEY TBMS SPECS -NOMINAL BORE D mm -MAX BORE D mm -FRONT SHIELD D mm -REAR SHIELD D mm -CHD POWER 4900 KW -CHD TORQUE KNm -CHD SPEED 0-6 RPM -MAIN THRUST KN -AUX. THRUST KN R.GRANDORI- SELI spa 17

18 TBM & BACK UP GENERAL LAYOUT DRAWING LUBE RESERVOIR HYDRA ULIC FRAME 3 WEIGHT = 21,000 LBS. (9,525 KG) VOLUME = 2,500 GALLONS (9,465 LITERS) HYDRAULIC RESERVOIR HYDRAULIC FRAME 2 HYDRAULIC FRAME 3 LUBE RESERVOIR HYDRAULIC FRAME 1 R.GRANDORI- SELI spa 18

19 TUNNEL CONVEYOR R.GRANDORI- SELI spa 19

20 MAIN ENCOUNTERED PROBLEMS LARGE GAS INFLOWS FACE ROOF STABILITY TUNNEL FACE ESTRUSION R.GRANDORI- SELI spa 20

21 GAS INFLOWS UP TO 11 BARS SPECIAL MEASURES SPECIAL PROCEDURES LONG STAND BY PERIODS REDUCED POSSIBILITY OF INTERVENTION LONGER TIME REQUIRED FOR ANY OPERATION R.GRANDORI- SELI spa 21

22 ADDITIONAL MEASURES TO COPE WITH PRESSURE GAS INFLOWS 3 R.GRANDORI- SELI spa 22

23 FACE STABILIZATION TREATMENT Void filled with resin Collapsed material consolidated with chemical grout mix R.GRANDORI- SELI spa 23

24 GROUND TREATMENT AHEAD OF THE FACE R.GRANDORI- SELI spa 24

25 TBM PROGRESSES IN THE CAHOTIC ARGILLITE FORMATIONS "Slickenside"; ground highly fractured / tectonisized; collapsing face; micropiling as roof support "Slickenside"; ground highly fractured / tectonisized; collapsing face and roof (<5m); extensive ground consolidation measures Intercalations of sandstone; ground stable, heavily fractured Ground heavily fractured, locally collapsing face Collapsing roof; heavily fractured and disintegrated; ground consolidation measures Pressurized methane gas inflow (~0,15m³/min, max. pressure 11 bar) Methane intrusion point while perforation (without significant pressure) R.GRANDORI- SELI spa 25

26 TBM DAILY PRODUCTION IN NORMAL ROCK CONDITIONS R.GRANDORI- SELI spa 26

27 ABDALAJIS WEEKLY PRODUCTIONS 200,0 180,0 160,0 140,0 120,0 100,0 80,0 60,0 40,0 20,0 0, R.GRANDORI- SELI spa 27

28 POSSIBLE IMPROVEMENT TO DSU TBM DESIGN AND OPERATION INCREASE MICROPILES LOCATIONS IN THE FRONT AND REAR SHIELD INSTAL LARGER DIAMETER STEEL MICROPILES INSTEAD OF FIBERGLASS MICROPILES INCREASE BELT CONVEYOR MUCKING CAPACITY IN RAVELLING GROUND R.GRANDORI- SELI spa 28

29 GEOLOGICAL APPLICATION RANGE OF DSU GT VERSUS DSU EPB TBM DSU GT TBM DEMOSNTRATE TO SUIT LARGE DIAMETER TUNNELS WITH LONG SECTIONS IN EXTREMELY POOR&SQUEEZING GROUND IN CASE HOWEVER ALMOST THE ENTIRE TUNNEL IS IN WEAK ROCK AND/OR LOOSE SOIL, TO AVOID THE SYSTEMATIC EXECUTION OF GROUND TREATMENTS, THE DSU EPB TYPE IS MORE SUITABLE. R.GRANDORI- SELI spa 29