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Jointed rock mass volume joint number determination method based on drilling camera shooting technology

A technology for jointed rock mass and determination method, which is applied to measurement devices, instruments, and optical devices, etc., can solve problems such as uneven spacing distribution, derivation, and correction coefficients, and achieve accurate and fast calculation and comprehensive factors.

Inactive Publication Date: 2020-09-11
NORTHEASTERN UNIV LIAONING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the formula, Sn is the number of joints of the nth group of joints per meter long survey line, and its value is equal to the reciprocal of the average spacing of the same group of joints in the survey line of sufficient length; Sk is the number of non-grouped joints per cubic meter of rock mass; The problem with this method is that the distribution of spacing in the actual rock mass is very uneven, or sometimes the length of the side line will be greater than 1m because the joint group is obliquely intersected with the surface of the unit body
The problem with this is that the correction coefficient comes from engineering experience and cannot be derived theoretically
The calculation result is not very accurate

Method used

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  • Jointed rock mass volume joint number determination method based on drilling camera shooting technology
  • Jointed rock mass volume joint number determination method based on drilling camera shooting technology
  • Jointed rock mass volume joint number determination method based on drilling camera shooting technology

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Embodiment 1

[0033] The embodiment of the present invention discloses a method for determining the volume joint number of jointed rock mass based on borehole camera technology, which includes the following steps:

[0034] S1. On the surface of the rock mass to be tested, select a surface area per unit area;

[0035] S2, measure the number of rock mass surface joints Js of the surface area per unit area, the joint spacing H and the inclination angle θ between the joints and the horizontal roadway;

[0036] S3, drilling a hole on the surface area per unit area, and measuring the number of joints Jc inside the rock mass;

[0037] S4. Comparing the joint spacing H measured in step S2 and the sine and cosine values ​​of the inclination angle θ between the joint and the horizontal roadway, to determine the volumetric joint number Jv of the rock mass.

[0038] In a specific embodiment, in step S2, three-dimensional digital photogrammetry and rock mass structure analysis system are used to measur...

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Abstract

The invention discloses a jointed rock mass volume joint number determination method based on a drilling camera shooting technology, which is applied to the technical field of rock mass integrity evaluation, and comprises the following steps of S1, selecting a surface area per unit area on the surface of a rock mass to be measured, S2, measuring the rock mass surface joint number Js, the joint distance H and the inclination angle theta between the joint and the horizontal roadway of the surface area of the unit area, S3, drilling holes in the surface area of the unit area, and measuring the number Jc of joints in the rock mass, and S4, comparing the joint distanceH measured in the step S2 with a sine value and a cosine value of the joint inclination angle theta, and determining the rock mass volume joint number Jv. According to the method, the volume joint Jv is calculated by comprehensively considering the internal joint Jc and the surface joint Js, the considered factors are more comprehensive, and the calculation is more accurate and faster.

Description

technical field [0001] The invention relates to the technical field of rock mass integrity evaluation, and more specifically relates to a method for determining the volume joint number of jointed rock mass based on borehole camera technology. Background technique [0002] In the prior art, methods for calculating the volumetric joint number Jv of rock mass include direct measurement method, distance method, and strip number method. Among them, the direct measurement method is to directly count the number of joints in the rock mass per unit volume, but the requirements for the site conditions are relatively large in use, and the condition of the free surface must be good. The spacing method refers to calculating the number of cracks per unit volume of rock mass by measuring the spacing of each group of structural planes in the rock mass and using the average value: [0003] Jv=S1+S2+...+Sn+Sk, [0004] In the formula, Sn is the number of joints of the nth group of joints pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/24
CPCG01B11/00G01B11/24
Inventor 金长宇崔健欣王凯冯庆杰安龙陈天宇
Owner NORTHEASTERN UNIV LIAONING
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