Determination Method of Volume Joint Number of Jointed Rock Mass Based on Borehole Camera Technology

A technology of jointed rock mass and determination method, which is applied to instruments, measuring devices, and optical devices, etc., can solve the problems of uneven distribution of spacing, the source of correction coefficients, and the calculation results are not very accurate, so as to achieve comprehensive considerations and accurate calculation. quick effect

CN111649672BInactive Publication Date: 2021-06-25NORTHEASTERN UNIV LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-06-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for determining the volume and joint number of jointed rock mass based on drilling camera technology, which is applied to the technical field of rock mass integrity assessment and includes the following steps: S1. Selecting a surface area per unit area on the surface of the rock mass to be tested ; S2, measure the rock mass surface joint number Js of the surface area of ​​the unit area, the joint spacing H and the inclination angle θ of the joint and the horizontal roadway; S3, drill holes on the surface area of ​​the unit area, and measure the number of joints inside the rock mass Jc; S4. Comparing the joint spacing H measured in step S2 with the sine and cosine values ​​of the joint inclination angle θ to determine the volumetric joint number Jv of the rock mass. The present invention comprehensively considers the internal joint Jc and the surface joint Js to calculate the volume joint Jv, the consideration factors are more comprehensive, and the calculation is more accurate and fast.
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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...

Examples

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...