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Deep jointed rock mass RQD determination method based on while-drilling monitoring technology

A jointed rock mass and determination method technology, which is applied in the directions of soil material testing, data processing application, material inspection products, etc., can solve the problems of many influencing factors and limited measurement methods of the rock mass quality index RQD, so as to save survey costs, The effect of simple calculation process and broad application prospects

Pending Publication Date: 2020-05-29
XIAN UNIV OF TECH
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Problems solved by technology

[0014] The purpose of the present invention is to provide a method for determining the RQD of deep jointed rock mass based on monitoring-while-drilling technology, which solves the problem that the existing rock mass quality index RQD has limited measurement methods due to many influencing factors

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  • Deep jointed rock mass RQD determination method based on while-drilling monitoring technology
  • Deep jointed rock mass RQD determination method based on while-drilling monitoring technology
  • Deep jointed rock mass RQD determination method based on while-drilling monitoring technology

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Embodiment

[0056] This embodiment illustrates the present invention by taking the drilling test of the traffic tunnel of the Daheba Hydropower Station on the Hanjiang River in China as an example.

[0057] (1) Traffic tunnel engineering background and drilling test equipment of Hanjiang Daheba Hydropower Station in China

[0058]The traffic tunnel is located under the right bank of the Daheba Hydropower Station on the Hanjiang River in China, on a steep slope with good stability and good geological conditions, with a slope of 45-52°. The morphology of the area is mainly high mountains and deep valleys, with steep sides, and the surrounding rocks are mainly composed of gray Silurian marble and crystalline limestone. Drilling tests are carried out along the tunnel route (about 0-25m) from the entrance section to the first fault. In the test area, there are weak areas, including broken pieces, joints, and broken and broken fragments. A total of two boreholes were drilled for the tunnel rou...

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Abstract

The invention discloses a deep jointed rock mass RQD determination method based on a while-drilling monitoring technology, and the method is specifically implemented according to the following steps:1, obtaining torque, bit pressure, rotating speed and drilling speed through site while-drilling monitoring equipment, and calculating the drilling energy of a jointed rock mass; 2, normalizing the drilling energy of the jointed rock mass obtained in the step 1; 3, calculating the discreteness of jointed rock mass drilling energy; and 4, calculating the RQD of the deep jointed rock mass based on the relationship between the drilling energy dispersion and the RQD. According to the method, the problem that an existing rock mass quality index RQD is limited due to many influence factors is solved.

Description

technical field [0001] The invention belongs to the technical field of in-situ testing of deep rock mass engineering, and in particular relates to a method for determining the RQD of deep jointed rock mass based on the monitoring-while-drilling technology. Background technique [0002] Rock mass quality index (RQD) is a method to express the goodness of rock mass. Since RQD is easy to determine, it is a more sensitive and appropriate indicator than core recovery rate. Therefore, it is widely used as an important index and reference for quality assessment of jointed rock mass in the world. Many engineers use RQD to determine the stability of rock masses, often based on their own experience. RQD was first proposed by Deere in 1963. In rock mass engineering, RQD is defined as: [0003] [0004] Palmstrom (2005) introduced weighted joint density (WJD), so that RQD can be expressed as: [0005] RQD=110-2.5J v (WJD) (2) [0006] where WJD is defined as f i is the nomin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/06G01N33/24
CPCG06Q10/06393G06Q10/06395G01N33/24
Inventor 何明明庞帆杨贝贝刘毅王滈藤张志强陈蕴生李宁
Owner XIAN UNIV OF TECH