2026-09-19T14:01:33Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/295582022-01-13T07:54:23Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Herbert H. Einstein.
Greenwood, Jedediah Drury, 1977-
Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering.
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
2006-03-24T16:02:06Z
2006-03-24T16:02:06Z
2003
2003
http://hdl.handle.net/1721.1/29558
52724290
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2003.
Includes bibliographical references (leaves 78-80).
A parametric study was performed to evaluate the effects of different construction variables on surface settlements above tunnels in soft ground. The finite element program "PLAXIS 3D Tunnel" was used to carry out the numerical analysis for the earth pressure balance (EPB) shield tunneling method in a saturated, normally consolidated clay. The two construction parameters that were varied were the face pressure and the grout pressure. Longitudinal settlement profiles were obtained for many different face pressures and several different grout pressures. Results show that the ground surrounding the tunnel is very sensitive to changes in grout pressure in terms of surface settlement and failure of the soil body, while a wide range of face pressures can be accommodated without failure. Furthermore, minimum surface settlement is achieved for a certain face pressure and becomes larger as the pressure is increased or decreased from that particular value, which for this analysis corresponded to an overload factor of one. Also, results show that surface settlement decreases with increasing grout pressure, as expected.
by Jedediah Drury Greenwood.
M.Eng.
80, [9] leaves
3713984 bytes
3713793 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Civil and Environmental Engineering.
Three-dimensional analysis of surface settlement in soft ground tunneling
3D analysis of surface settlement in soft ground tunneling
Thesis
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<Abstract>A parametric study was performed to evaluate the effects of different construction variables on surface settlements above tunnels in soft ground. The finite element program "PLAXIS 3D Tunnel" was used to carry out the numerical analysis for the earth pressure balance (EPB) shield tunneling method in a saturated, normally consolidated clay. The two construction parameters that were varied were the face pressure and the grout pressure. Longitudinal settlement profiles were obtained for many different face pressures and several different grout pressures. Results show that the ground surrounding the tunnel is very sensitive to changes in grout pressure in terms of surface settlement and failure of the soil body, while a wide range of face pressures can be accommodated without failure. Furthermore, minimum surface settlement is achieved for a certain face pressure and becomes larger as the pressure is increased or decreased from that particular value, which for this analysis corresponded to an overload factor of one. Also, results show that surface settlement decreases with increasing grout pressure, as expected.</Abstract>
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