Method for determining surrounding rock pressure of tunnel having cavity behind lining

A technique for determining the surrounding rock pressure and method, which is applied in special data processing applications, instruments, and electrical digital data processing, etc., can solve the problems of not considering the changes in the distribution of surrounding rock pressure and the inability to comprehensively evaluate the safety of lining structures, etc., to achieve The effect of total security

Active Publication Date: 2017-04-19
CHANGAN UNIV
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Problems solved by technology

However, the existing methods do not consider the changes in the distribution of surrounding ro

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  • Method for determining surrounding rock pressure of tunnel having cavity behind lining
  • Method for determining surrounding rock pressure of tunnel having cavity behind lining
  • Method for determining surrounding rock pressure of tunnel having cavity behind lining

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Embodiment

[0033] The detection of the cavity behind the lining of railway tunnels and highway tunnels shows that the cavity behind the lining at the vault position of the tunnel is more serious than other positions of the tunnel. Therefore, the method for determining the surrounding rock pressure of the tunnel when there are cavities behind the lining is mainly aimed at the situation that the cavities behind the lining are located directly above the vault and are symmetrically distributed on the left and right sides of the vault. Such as figure 1 As shown in Fig. 1, the stratum structure model of the tunnel with and without voids in the lining vault was established respectively, and then the changes of vertical surrounding rock pressure and horizontal side pressure of the tunnel with and without voids and with different void widths were obtained through finite element analysis. figure 2 The variation of the vertical surrounding rock pressure and horizontal lateral pressure on the linin...

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Abstract

The invention relates to the field of tunnel engineering, and in particular relates to a method for determining the surrounding rock pressure of a tunnel having a cavity behind a lining. By means of the method, disappearance of the surrounding rock pressure of an area, where a cavity is, is considered; furthermore, on the basis of revealing the distribution rule and size of the surrounding rock pressure when the cavity exists, the change feature of the surrounding rock pressure when the cavity exists is considered; and thus, the security of a lining structure when the cavity exists can be evaluated more comprehensively. The method disclosed by the invention comprises the following steps of: (1), respectively establishing tunnel stratum-structure models when a cavity exists or does not exist on the arch of the lining, and then, obtaining the change conditions of the vertical surrounding rock pressure and the horizontal lateral pressure of the tunnel through finite element calculation and analysis when the cavity exists or does not exist and when cavity widths are different; (2), determining the distribution rules of the vertical surrounding rock pressure and the horizontal lateral pressure in a load-structure method model when the cavity exists on the arch exists; and (3), determining the values of the vertical surrounding rock pressure and the horizontal lateral pressure when the cavity exists on the arch exists.

Description

[0001] 1. Technical field: [0002] The invention relates to the field of tunnel engineering, in particular to a method for determining the surrounding rock pressure of a tunnel with a cavity behind the lining. [0003] 2. Background technology: [0004] The void behind the lining of the tunnel due to over-excavation during construction, insufficient backfill or long-term erosion of groundwater is a common tunnel defect. It is generally believed that the existence of voids behind the lining will change the distribution and size of the surrounding rock pressure acting on the lining, resulting in unbalanced stress on the lining, which will affect the safety of the structure. Therefore, it is necessary to evaluate the safety of the lining structure when the void behind the lining exists. In tunnel mechanics, the commonly used mechanical analysis models include the load-structure method model and the formation-structure method model. Among them, the load-structure method model ha...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 陈建勋陈丽俊芒来罗彦斌
Owner CHANGAN UNIV
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