Method for determining nonpenetrating jointed and fractured rock mass deformation parameter

A fractured rock mass and determination method technology, applied in the field of geotechnical engineering investigation, can solve problems such as difficulty in meeting engineering needs, large error in deformation parameters of non-penetrating fractured rock mass, etc.

Inactive Publication Date: 2009-12-16
XIAN UNIV OF TECH
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Problems solved by technology

The deformation parameters of traditional non-perforated fractured rock mass are determined through costly field large shear experiments or unrepresentative indoor experiments. Although these two determination methods have been widely used in engineering and have summed up a lot of application exper

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  • Method for determining nonpenetrating jointed and fractured rock mass deformation parameter
  • Method for determining nonpenetrating jointed and fractured rock mass deformation parameter
  • Method for determining nonpenetrating jointed and fractured rock mass deformation parameter

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Embodiment

[0079] Example: 0+150.0~0+170.0 tunnel section of 1# diversion tunnel in a certain project, according to the on-site geological report, there are 5 groups of fracture groups distributed in the surrounding rock of this tunnel section, and the distribution of fracture groups is as follows Figure 5 As shown, the geometric and mechanical parameters of each non-penetrating fracture group are shown in Table 1 below:

[0080] Table 1. Rock mass structure characteristic parameter list of 1# diversion tunnel 0+150.0~0+170.0 tunnel section of a certain project

[0081] Group

[0082] Substituting the parameters in the rock mass structural characteristic parameter table of the 1# diversion tunnel 0+150.0~0+170.0 into the formula (7) and formula (8), it can be obtained that the surrounding rock deformation parameters of the tunnel section, including the deformation mode Quantity and Poisson's ratio, as shown in Table 2 below. For comparison, the surrounding rock deformation p...

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Abstract

The invention discloses a method for determining nonpenetrating jointed and fractured rock mass deformation parameter, comprising the following steps: 1) data is collected, fractured group analysis is carried out on the fracture of the nonpenetrating jointed and fractured rock mass of a sample rock, a plurality of fractured groups having main influence are collected, and the values of the inclination, the connection ratio, the interval and the thickness ratio of each fracture are obtained by detection; 2) the values of the deformation modulus, the Poisson Ratio of a filler in the nonpenetrating fracture of each fracture collected in step 1, and the deformation modulus of and the Poisson Ratio of the rock are obtained through indoor rock mechanics experiments; 3) the deformation model of a nonpenetrating fractured rock mass is built; 4) the exact values of all parameters obtained in step 1 and step 3 are substituted in a model formula obtained in step 3 so as to obtain a plurality of nonpenetrating fractured rock mass deformation modulus and the Poisson ratio values in the sample rock. The value error is obviously lowered, which can satisfy engineering requirements or design requirements.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering investigation, and relates to a method for determining deformation parameters of non-penetrating joint fissure rock mass. Background technique [0002] The scientific determination of deformation parameters of non-penetrating fractured rock mass is extremely important in the design, stability evaluation and formulation of reinforcement measures for rock mass engineering such as underground caverns, rock slopes, and rock subgrades. The deformation parameters of traditional non-perforated fractured rock mass are determined through costly field large shear experiments or unrepresentative indoor experiments. Although these two determination methods have been widely used in engineering and have summed up a lot of application experience, but These methods cannot directly reflect important factors such as non-perforated fractures that affect the deformation properties of rock mass, and t...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 张志强李宁陈方方
Owner XIAN UNIV OF TECH
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