Method for determining jointed rock mechanical parameters

A technology for determining mechanical parameters and methods, applied in scientific instruments, measuring devices, instruments, etc., can solve problems such as difficulty in verifying the rationality of estimated parameter values, high cost of test cycle, reliability problems, etc., to achieve verification reliability and uniqueness Effect

Inactive Publication Date: 2013-06-26
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Although the problems of long test period and high cost of indoor and outdoor tests can be avoided, there are still the following problems: (1) The determination of the input parameter GSI mainly depends on geological survey, which has human factors and

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  • Method for determining jointed rock mechanical parameters
  • Method for determining jointed rock mechanical parameters
  • Method for determining jointed rock mechanical parameters

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Embodiment Construction

[0048] This embodiment takes the Duye Tunnel of Jihuai Expressway as an example to illustrate the present invention.

[0049] 1. Overview of Duye Tunnel Project

[0050] The Duye Tunnel of Jihuai Expressway is a two-way 4-lane double-arch tunnel. The tunnel is located in Fenghuang County, Jishou City, Hunan Province. The starting and ending mileage of the tunnel is K34+198~K34+704. The tunnel design clearance:

[0051] 2×10.75×5.0m. The surrounding rock at the entrance section of the tunnel (K34+200~K34+250) has a loose structure (level V) with a maximum buried depth of about 25m. It is a shallow buried tunnel with two large-scale faults, obvious bedding and well-developed joints , The lithology of the tunnel surrounding rock formation is complex and changeable.

[0052] 2. Estimation and determination of strength parameters based on H-B strength criterion

[0053] Estimation results of strength parameters of bulk surrounding rock:

[0054] In this embodiment, the entrance...

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Abstract

The invention discloses a method for determining jointed rock mechanical parameters. Aiming at solving the problem that the existing jointed rock mechanical parameters have low reliability, the method comprises the following steps of: 1) measuring the uniaxial compressive strength sigmac of a rock, the flexibility mi of the rock, the GSI (geographical strength index) and the disturbance factor D; 2) estimating the mechanical parameters of rock, such as mass C, phi, sigmat and EH, by Hoek-Brown strength criterion; 3) establishing a numerical calculation model so as to obtain the calculated displacement, comparing with the site displacement so as to obtain a comparison result, and determining whether the strength of the GSI is regulated nor not according to the comparison result; and 4) comparing EH and EB, wherein when (EH-EB)/EH is less than 5%, the deformation parameter E of elasticity modulus is estimated as the deformation parameter EH of the elasticity modulus, then the jointed rock parameter is determined, if not, returning to step 1) and reregulating the strength of the GSI. By combining two theories, the method can determine the reliable jointed rock parameters, and is applicable to rocks with very good quality or cracked rocks or anisotropy rocks.

Description

technical field [0001] The invention relates to a method for determining mechanical parameters of jointed rock mass. Background technique [0002] In the stability evaluation of geotechnical engineering, the design of structure and site support, and the numerical simulation of engineering entities, the study of the determination of engineering rock mechanics parameters is very important. [0003] At present, the commonly used theories for obtaining rock mass mechanical parameters include the rock mass parameter estimation theory based on the Hoek-Brown (hereinafter referred to as H-B) strength criterion and the displacement inversion theory based on numerical simulation. [0004] 1. Rock mass estimation method based on Hoek-Brown criterion [0005] First of all, some parameters need to be input when designing rock excavation engineering, which requires providing a criterion to estimate the strength of rock mass. Based on the analysis of Griffith theory and modified Griffit...

Claims

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Application Information

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IPC IPC(8): G01N3/00
Inventor 韦秉旭黎瑞洪张耿铖刘清芳王建疆李建雄李至悦
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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