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http://dx.doi.org/10.12989/gae.2022.28.5.531

Investigation on ground displacements induced by excavation of overlapping twin shield tunnels  

Qi, Weiqiang (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijinig)
Yang, Zhiyong (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijinig)
Jiang, Yusheng (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijinig)
Yang, Xing (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijinig)
Shao, Xiaokang (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijinig)
An, Hongbin (China Railway 12th Bureau Group Co., Ltd.)
Publication Information
Geomechanics and Engineering / v.28, no.5, 2022 , pp. 531-546 More about this Journal
Abstract
Ground displacements caused by the construction of overlapping twin shield tunnels with small turning radius are complex, especially under special geological conditions of construction. To investigate the ground displacements caused due to shield machines in the unique calcareous sand layers in Israel for the first time and determine the main factors affecting the ground displacements, field monitoring, laboratory geological analysis, theoretical calculations, and parameter studies were adopted. By using rod extensometers, inclinometers, total stations, and automatic segment-displacement monitors, subsurface tunneling-induced displacement, surface settlement, and displacement of the down-track tunnel segments caused by the construction of an up-track tunnel were analyzed. The up-track tunnel and the down-track tunnel pass through different stratum, resulting in different construction parameters and ground displacements. The laws of variation of thrust and torque, soil pressure in the chamber, excavated soil quantity, synchronous grouting pressure, and grout volume of the two tunnels from parallel to fully overlapping orientations were compared. The thrust and torque of the shield in the fine sand are larger than those in the Kurkar layer, and the grouting amount in fine sand is unstable. According to fuzzy statistics and Gaussian curve fitting of the shield tunneling speed, the tunneling speed in the Kurkar stratum is twice that in the fine-sand stratum.
Keywords
calcareous sand stratum; geological characteristics; ground displacement; parametric study; shield tunneling;
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Times Cited By KSCI : 8  (Citation Analysis)
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