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Method for measuring surrounding rock displacement of deeply-buried circular tunnel based on limit state theory

A limit state and surrounding rock technology, applied in the field of tunnel wall displacement measurement, can solve problems such as difficult to respond to the nonlinear expansion of surrounding rock, hindering the development of tunnel construction, and large errors in tunnel displacement.

Inactive Publication Date: 2019-10-22
HOHAI UNIV +1
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Problems solved by technology

At present, the commonly used theoretical calculation method for the displacement of surrounding rock in tunnel excavation relies on the constitutive model used, but the parameters of the constitutive model are difficult to obtain accurately, and it is difficult to reflect the expansion nonlinearity of different surrounding rock along the radial direction. Therefore, the designed and calculated tunnel The large error between the displacement and the actual value hinders the development of tunnel construction

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  • Method for measuring surrounding rock displacement of deeply-buried circular tunnel based on limit state theory
  • Method for measuring surrounding rock displacement of deeply-buried circular tunnel based on limit state theory
  • Method for measuring surrounding rock displacement of deeply-buried circular tunnel based on limit state theory

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Embodiment Construction

[0113] The buried depth of a circular tunnel is 1160m, and the excavation radius is 3.7m. The rock physical and mechanical parameters obtained through the rock unloading test are shown in Table 1.

[0114] Table 1 Parameter Acquisition Table

[0115]

[0116] Through the stress-strain curves of rock unloading tests under different confining pressures, the maximum principal stress at the beginning of expansion failure corresponding to the unloading test curve when the confining pressure is 10MPa is closest to 2γH, so this curve is approximated as the rock mass in the crushing area along the radial direction. The unloading destruction process curve, such as Figure 10 .

[0117] Such as Figure 11 , intercept the curve with body strain greater than 0 stage, and divide the obtained curve into n layers on the vertical axis, corresponding to n layers with different thicknesses in the crushing zone.

[0118] Determination of the scope of the crushing area:

[0119] The new me...

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Abstract

The invention discloses a method for measuring surrounding rock displacement of a deeply-buried circular tunnel based on the limit state theory. The method comprises the following steps of measuring an initial stress field p0 of a rock body; when the broken area exists, carrying out the triaxial unloading test according to the initial stress field to obtain a broken area surrounding rock unloadingcurve and a broken area outer boundary radial stress pic; calculating the radius Rc of the crushing area by using a layered summation method according to the surrounding rock unloading curve of the crushing area; according to the radial stress pic of the outer boundary of the crushing area and the radius Rc of the crushing area, calculating the radius Rp of a plastic area by using a layered summation method; calculating the displacement uC of the outer boundary of the crushing area according to the surrounding rock unloading curve of the crushing area; according to the displacement uC of theouter boundary of the broken area, calculating u0 of the maximum displacement of the tunnel wall by using a layered summation method; and calculating the displacement of the surrounding rock accordingto the u0 of the maximum displacement of the tunnel wall and the radius Rp of the plastic zone. The method is high in accuracy, complete in theory and simple in calculation.

Description

technical field [0001] The invention relates to a method for measuring the displacement of a tunnel wall, in particular to a method for measuring the displacement of surrounding rock in a deeply buried circular tunnel based on the limit state theory. Background technique [0002] Under the action of hydrostatic stress field, the displacement calculation around a circular cavern excavated in isotropic rock mass has always been one of the basic problems in the theoretical research of deep tunnel design. It is also one of the important reference factors for the optimal design of tunnel excavation diameter and the design of displacement safety monitoring control value. At present, the commonly used theoretical calculation method for the displacement of surrounding rock in tunnel excavation relies on the constitutive model used, but the parameters of the constitutive model are difficult to obtain accurately, and it is difficult to reflect the expansion nonlinearity of different s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 沈才华郭佳旺古文博王媛钱晋谢飞
Owner HOHAI UNIV
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