Method for predicting stratum additional stress caused by curved tunnel shield shell friction force
A technology of additional stress and prediction methods, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as cumbersome calculation ideas, and achieve the effect of high calculation efficiency
Pending Publication Date: 2020-03-13
BEIJING UNIV OF TECH
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Problems solved by technology
Existing prediction methods are not suitable for the complex 3D model of curved tunnels, and the traditional calculation ideas are relatively cumbersome. It is urgent to find a suitable calculation model and an effective calculation method to predict the influence of friction on the additional stress of the curved tunnel formation
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[0046] see figure 1 , which is the excavation model diagram of curved shield tunneling. First, a three-dimensional rectangular coordinate system is established. The coordinate origin, x-axis, and y-axis in the coordinate system are all located on the ground surface, and the z-axis is vertically downward. The prediction method of the formation additional stress caused by the shield shell friction of the curved tunnel described in this embodiment includes the following steps:
[0047] S1: Assume that a shield tunnel is excavated along a curved path, and its axis is a circular arc whose center is on the z-axis and whose curvature radius is Q. Preferably, the propulsion trajectory of the shield machine is along the figure 1 As shown in the standard space annulus, the space equation of the outer annulus of the shield machine is:
[0048]
[0049] In the formula, h is the buried depth of the center point of the tunnel; R is the outer diameter of the shield machine.
[0050] B...
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The invention discloses a method for predicting stratum additional stress caused by a curved tunnel shield shell friction force. The method comprises the following steps: (1) rewriting a Mindlin formula into a general formula convenient for calculation: under a three-dimensional rectangular coordinate system, replacing appointed points (0, 0, c) in the Mindlin formula with any points (x0, y0, z0)to obtain a calculation formula causing stratum additional stress under the action of unit force; and (2) based on the general formula obtained in the step (1), performing integral processing on the stress component of the stratum internal point (x, y, z) caused by the unit force to obtain a calculation formula of stratum additional stress caused when the acting surface on the space curved surfacedistributes the force. According to the method, based on the rewritten Mindlin formula, the spatial distribution of the friction force between the actual curve tunnel shield shell and the stratum iscombined, stratum additional stress prediction can be accurately carried out, and the method has the advantages that corresponding parameter values are easy to carry out, calculation is convenient andpractical, and the like.
Description
technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for predicting the additional stress of the formation caused by the friction between the shield shell of the curved shield tunnel and the formation. Background technique [0002] Restricted by site conditions or buildings, the construction of subway lines will inevitably have curved tunnels, and even sharp curves. In the process of realizing the curved trajectory of the shield machine, the friction force of the parameters between the shield shell and the soil will inevitably cause disturbance to the formation. At present, the prediction of the friction force on the formation disturbance is mostly limited to its influence on the formation displacement. Regarding the formation stress There are few calculation methods for prediction, and the change of stress state is the main cause of formation displacement. What is more worth mentioning is that the prediction a...
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IPC IPC(8): G06F30/13G06F119/14G06T17/00
CPCG06T17/00
Inventor 张明聚李少华李鹏飞
Owner BEIJING UNIV OF TECH