Determination method suitable for deeply-buried large-diameter soft rock hydraulic tunnel reserved deformation

A technology for hydraulic tunnels and determination methods, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as affecting the smooth progress of the project and result errors, and achieve a reasonable reserved deformation, low threshold for use, and convenient use. Effect

Inactive Publication Date: 2014-08-27
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

At present, for such projects, the engineering analogy method is mostly used, but due to the lack of engineering experience and engineering analogy, as well as

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  • Determination method suitable for deeply-buried large-diameter soft rock hydraulic tunnel reserved deformation
  • Determination method suitable for deeply-buried large-diameter soft rock hydraulic tunnel reserved deformation
  • Determination method suitable for deeply-buried large-diameter soft rock hydraulic tunnel reserved deformation

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Embodiment Construction

[0017] In deep-buried large-diameter soft rock tunnels, the secondary stress state of the surrounding rock may exceed the compressive strength of the surrounding rock or the local shear stress may exceed the shear strength of the rock mass, thus causing the rock mass in this part to enter a failure state. , so the elastic-plastic analysis method can be used to obtain the displacement change around the tunnel.

[0018] This embodiment is applicable to a method for determining the reserved deformation of a deep-buried large-diameter (generally requiring a diameter of more than 6m) soft rock hydraulic tunnel, including the following steps:

[0019] S1. Since there is no measured initial in-situ stress field data available in the early stage of tunnel excavation, in order to estimate the reserved deformation in the early stage of excavation, the initial in-situ stress field must first be clarified. This embodiment provides a simple and convenient analysis method for the initial st...

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Abstract

The invention relates to a determination method suitable for deeply-buried large-diameter soft rock hydraulic tunnel reserved deformation and aims at providing a method for directly determining the deeply-buried large-diameter soft rock hydraulic tunnel reserved deformation under different conditions, directly calculating the deformation required to be reserved according to surrounding rock categories, tunnel size, ground stress magnitude and supporting intensity, providing a convenient means for tunnel cross section size design, enabling the introduction threshold to be low and enabling the working efficiency to be remarkably improved. The technical scheme is that the method comprises the steps of (S1) determining initial ground stress; (S2) determining the surrounding rock categories and obtaining corresponding physical-mechanical indexes including Poisson's ratio, elasticity modulus, cohesive force and internal friction angle according to the surrounding rock categories; (S3) utilizing a formula (shown in the description) to calculate displacements of tunnel periphery under the conditions of different rock categories, different supporting intensities, different tunnel sizes and different ground stresses according to the actual situation, namely the reserved tunnel deformation.

Description

technical field [0001] The invention relates to a method for determining reserved deformation suitable for deep-buried large-diameter soft-rock hydraulic tunnels, and is mainly applicable to water conservancy and hydropower projects, especially deep-buried large-diameter (generally required to exceed 6m in diameter) soft-rock hydraulic tunnels excavation. Background technique [0002] The reserved deformation amount is the reserved deformation space pre-designed (generally larger than the original excavation contour) to prevent excessive deformation of the surrounding rock. For deep-buried soft rock tunnels, the problem of large extrusion deformation will be very prominent. In order to maintain sufficient stability of the surrounding rock, the deformation of the tunnel surrounding rock is usually controlled within a certain range. The controlled deformation of soft rock excavation will occupy part of the tunnel diameter of the excavation section, and usually cannot be ignor...

Claims

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Application Information

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IPC IPC(8): E21D9/14
Inventor 刘宁张伟张洋邬远祥鲍世虎
Owner POWERCHINA HUADONG ENG COPORATION LTD
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