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Measurements and Analysis of Settlement Caused by the Construction of
an Undersea Immersed Tunnel
(1 School of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 2 Geotechnical Engineering Research Institute of Zhejiang University, Hangzhou 310058)
Abstract In this paper, a settlement development law is analyzed based on settlement monitoring data obtained during the construction of an undersea immersed tunnel in the Zhejiang Province of China. Single-element settlement and differential settlement of multiple elements are studied, and the settlement mechanism of an undersea immersed tunnel is discussed from the perspective of soil compression in order to present that construction time differences and accumulative settlement differences of a single element are the main causes for differential settlement. Additionally, the influence of grouting and backfilling is analyzed and it is determined that grouting differences are internal causes for subsequent differential settlements and that compression of the foundation layer and soil layer induced by backfilling is the external cause of settlement during construction. Using the layerwise summation method, the foundation layer compression modulus of 1.89MPa is obtained by back-analysis, which shows a poor compression characteristic of the foundation layer caused by a high degree of siltation.
Abstract：
In this paper, a settlement development law is analyzed based on settlement monitoring data obtained during the construction of an undersea immersed tunnel in the Zhejiang Province of China. Single-element settlement and differential settlement of multiple elements are studied, and the settlement mechanism of an undersea immersed tunnel is discussed from the perspective of soil compression in order to present that construction time differences and accumulative settlement differences of a single element are the main causes for differential settlement. Additionally, the influence of grouting and backfilling is analyzed and it is determined that grouting differences are internal causes for subsequent differential settlements and that compression of the foundation layer and soil layer induced by backfilling is the external cause of settlement during construction. Using the layerwise summation method, the foundation layer compression modulus of 1.89MPa is obtained by back-analysis, which shows a poor compression characteristic of the foundation layer caused by a high degree of siltation.
WEI Gang-1,
QIU Hui-Jie-2,
DING Zhi-1 etc
.Measurements and Analysis of Settlement Caused by the Construction of
an Undersea Immersed Tunnel
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 121-128
2014, Vol. 51 