Abstract
According to the existing practical engineering data, the settlement curve of shield tunnel with small curvature radius is obviously different from that of straight tunnel, so using Peck formula to forecast the surface settlement is not applicable. This paper describes results from a series of the laboratory test carried out in sandy soil, which based on similarity theory. According to the test results, the characteristics of surface settlement caused by small radius tunnel excavation are summarized, and the effects of turning radius and buried depth on the surface settlement are demonstrated. Based on Gaussian formula, a method of forecasting the surface settlement caused by construction of shield tunnel with small curvature radius is developed.
Highlights
Based on similarity theory, a homemade test device is used to simulate excavation process of shield tunnel with different turning radius and different buried depth
The rules and formula presented in this manuscript can provide a method to forecast the surface settlement caused by the construction of small radius shield tunnel, which will play the role of guiding construction
The ground settlement caused by excavation decreases with the increase of the tunnel burial depth, while the width of settlement trough increases
Summary
There are 11 monitoring points are designed in the range of 3 times the tunnel diameter from the central axis. The cross-section, which is 40 cm away from the tunnel portal, is selected as the measurement section. Because the tunnel line is curved, the axis of the test box does not coincide with the tunnel axis, the deviation of tunnel axis should be taken into account. Measurement range and accuracy of the dial gauges is 10 mm and 0.01mm, respectively
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