Ground Movement and Existing Tunnel Deformation Induced by Overlapped Tunneling
Publication: International Journal of Geomechanics
Volume 22, Issue 7
Abstract
Tunneling inevitably induces changes in soil stress and, hence, may adversely affect the surrounding ground and nearby existing tunnels. A model test and a series of numerical analyses were carried out to investigate the response of the ground and existing tunnels in sandy soil to nearby tunneling according to the relative spacing. The test results showed that increasing the distance-to-diameter ratio (d/D) changed the settlement trough from W-shaped to U-shaped along the transverse section. In addition, the major settlement area induced by each advancing step along the longitudinal section was within 0.75D in front of the tunnel face. The numerical results showed that the overall downward movement of the existing tunnel was due to the combined action of soil pressure and excavation unloading. In this article, the mechanism of the W-shaped surface settlement is discussed; a modified Peck formula is used to describe the W-shaped settlement trough, and the relation of typical parameters to d/D is analyzed.
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Acknowledgments
The work in this paper was financially supported by the National Key Research and Development Program of China (Grant No. 2017YFC0805402) and the Open Project Fund of State Key Laboratory of Disaster Reduction in Civil Engineering (Grant No. SLDRCE17-01). These supports are greatly appreciated.
Notation
The following symbols are used in this paper:
- B
- length of the major settlement area;
- C
- cover depth;
- C0
- buried depth of the new tunnel;
- D
- diameter of a tunnel;
- E
- soil Young's modulus;
- Gs
- specific gravity;
- I
- settlement trough parameters;
- i0
- horizontal distance between the inflection point and tunnel axis;
- i1
- horizontal distance between the inflection point of the left local settlement and tunnel axis;
- i2
- horizontal distance between the inflection point of the right local settlement and tunnel axis;
- k
- lateral earth pressure coefficient;
- L
- length of the tunnel;
- R
- tunnel radius;
- S
- ground surface settlement;
- S0(x)
- single tunneling settlement;
- S0max
- maximum single tunneling settlement;
- S1(x)
- left local settlement;
- S2(x)
- right local settlement;
- Vloss
- soil volume loss;
- x
- distance from the centerline of a tunnel to the settlement measurement point;
- y
- distance from settlement point to coordinate origin;
- ψ
- dilatancy angle;
- δ
- advancing length;
- η
- soil volume loss ratio;
- γ
- unit weight of the soil; and
- φ
- internal angle of friction.
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Published In
International Journal of Geomechanics
Volume 22 • Issue 7 • July 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 23, 2021
Accepted: Feb 12, 2022
Published online: May 6, 2022
Published in print: Jul 1, 2022
Discussion open until: Oct 6, 2022
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