Soil me

1. Benha University
Shoubra Faculty of Engineering
Civil Engineering Dep.
Numerical assessment of laterally loaded piled-foundation
effect on a nearby tunnel
By
Ahmad Maher Abdel Rahman Adam
Teaching assistant at Civil Engineering Dep. Benha university
Supervision committee
Prof.Dr. Nasser Mosleh
Professor of geotechnical engineering
Civil Engineering Dep.
Shoubra Faculty of engineering
Benha University
Dr. Walid Ahmed Dawoud
Assistant Professor of geotechnical engineering
Civil Engineering Dep.
Shoubra Faculty of engineering
Benha University

2. Research Objectives
 1- Implementation of numerical model that can predict greenfield surface settlement
due to tunneling, effect of tunneling on existing buildings and pile response to
tunneling.
 2- Validation of the implemented model using field data.
 3- Modeling of laterally loaded piles near the tunnel to predict its effect on the
tunnel.
 4- investigating the effect of soil type, tunnel and pile configuration and lateral load
value
 5- proposing precaution that can be taken to minimize pile effect on the tunnel

3. Work progress
Work Progress

4. Work progress
1- Numerical Model (Plaxis 3D).

5. Work progress
2- Model validation
Jubilee line extension in London (Withers 2001)
Locations of reference sites in Jubilee line extension

6. Work progress
2- Model validation
Vertical
displacement
at
GL
(mm)
Position from tunnel axis (m)
Jubilee line extension in London (Withers 2001)
Greenfield surface settlement at Southwark Park reference site
due to westbound tunnel
Vertical
settlement
(mm)
Distance from Point 5032 (Corner point)
Neptun house induced settlement due to westbound tunnel.

7. Work progress
2- Model validation
Pile MRT North-east line tunnel in Singapore (Pang et.al. 2006)
Typical section of viaduct bridge foundation and
twin tunnel configuration

8. Work progress
2- Model validation
Pile MRT North-east line tunnel in Singapore (Pang et.al. 2006)
Greenfield surface settlement at MRT NEL site due to southbound
tunnel excavation.
Vertical
displacement
at
GL
(mm)
Position from tunnel axis (m)

9. Work progress
2- Model validation
Pile MRT North-east line tunnel in Singapore (Pang et.al. 2006)
Piles induced axial force due to southbound tunnel excavation.
Depth
(m)
Axial Compression force (KN)
PILE P1
Tunnel C.L
Depth
(m)
Axial Compression force (KN)
PILE P2
Tunnel C.L

10. Work progress
2- Model validation
Pile MRT North-east line tunnel in Singapore (Pang et.al. 2006)
Piles induced transverse bending moment due to southbound
tunnel excavation.
Depth
(m)
Transverse bending moment (KN.m)
PILE P1
Tunnel C.L
Depth
(m)
Transverse bending moment (KN.m)
PILE P2
Tunnel C.L

11. Work progress
3- PILE near tunnel modeling

12. Work progress
4- Parametric study Program
1. To study the effect of (LP/LT) Ratio (5 Cases).
(LP/LT) = 0.5, 1, 1.5, 2 , Pile tip at tunnel crown , Pile tip at pile invert
2. To study the effect of lateral load on pile (6 Cases).
Lateral load = 50%, 75%, 100% of pile capacity (Load direction towards the tunnel )
Lateral load = 50%, 75%, 100% of pile capacity (Load direction in the opposite direction)
3. To study the effect of clearance between pile and tunnel. (4 Cases).
Clearance = 0.5, 1, 1.5, 2 DT
4. To study the effect of (LT/DT) ratio. (4 Cases).
(LT/DT) ratio. = 0.5, 1, 2, 3

13. Work progress
4- Parametric study Program
5. To study the effect of soil type (SAND). (6 Cases).
Medium dense sand, Dense sand, Very dense sand at lateral load (50% and 100%) of pile
capacity
6. To study the effect of soil type (CLAY). (6 Cases).
Soft, medium stiff and stiff clay at lateral load (50% and 100%) of pile capacity
7. To study the effect of Rigidity or flexibility of pile (2 cases).
Rigid pile and flexible pile