Method for acquiring joint rigidity of rock mass

An acquisition method and jointing technology, applied in the direction of electrical digital data processing, special data processing applications, complex mathematical operations, etc., can solve the problems of large rock damage, secondary pollution, rock hardness, and human factors. Achieve the effects of avoiding secondary pollution, simplifying the experimental procedure, and solving the complicated acquisition steps

Pending Publication Date: 2022-04-29
BEIJING UNIV OF TECH
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Problems solved by technology

However, the traditional drilling method has a greater degree of damage to the rock, which will expose the interior to the air, causing secondary pollution, and is greatly affected by the hardness of the rock and human factors.

Method used

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  • Method for acquiring joint rigidity of rock mass
  • Method for acquiring joint rigidity of rock mass
  • Method for acquiring joint rigidity of rock mass

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Experimental program
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Effect test

Embodiment Construction

[0035] Adopt percussion device to implement the present invention, do further detailed description below:

[0036] The first step: select the same granite rock rod samples 5 and 7, measure the length of the granite rock rod 5 three times with a scale to obtain l 1 , l 2 , l 3 , taking the average of the three measurement results as the length of the rock rod Measure the end diameter of the rock rod 5 for 3 times with a vernier caliper to obtain d 1 、d 2 、d 3 , taking the average of the three measurement results as the cross-sectional diameter of the rock rod use the formula Calculate the cross-sectional area A of the rock rod; finally measure the mass M of the rock rod through an electronic scale; use the formula Calculation of rock mass bar density ρ 0 ;Use the wave velocity meter to measure the wave velocity V p , use the formula E=ρ 0 V p 2 Obtain the elastic modulus E; use the formula z=ρ 0 V p Obtain the wave impedance z.

[0037] The second step: if ...

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Abstract

The invention discloses a rock mass joint rigidity acquisition method, which comprises the following steps of: deducing a function expression of a transmission coefficient T according to a displacement discontinuity method of a stress wave in a linearly deformed jointed rock mass: establishing a joint rigidity-related function relational expression of incident harmonics and transmission harmonics at a frequency domain angle; performing discrete Fourier transform on the incident wave and the transmission wave in the time domain to obtain a series of incident harmonics and a series of transmission harmonics; according to the function expression of the transmission coefficient T, combining a series of data of incident harmonics and transmission harmonics, and fitting the joint stiffness kn which enables the data of the incident harmonics and the transmission harmonics to meet the function expression of the transmission coefficient. According to the method, the strain change curves of the two positions before and after the joint are measured by knocking the rock mass once, namely the time domain strain-time diagrams of incident waves and transmitted waves, and the joint rigidity of the joint in the rock rod can be determined by inputting the time domain strain-time diagrams into a program, so that the experimental process is simplified, and secondary pollution caused by drilling and coring measurement of the rock mass is avoided.

Description

technical field [0001] The invention belongs to the technical field of rock mass measurement, in particular to a method for reversing the stiffness of a single linear macroscopic joint in a rock bar. Background technique [0002] The rock mass is composed of complete rocks and discontinuous surfaces such as joints, fissures, and faults. When the stress wave is incident on the rock mass, emission and transmission phenomena will occur at the joints, and the obtained incident wave and transmitted wave signals will carry mechanical forces related to the joints. Parameters such as: joint stiffness, and then you can understand the internal structure characteristics of the rock mass and the change law of stress. With the construction of underground engineering and mining engineering in my country, the joint structure in the rock has an important impact on the overall strength and stability of the rock mass during the mining and excavation process, and is also crucial to the design ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06F30/20G06F17/15G06F17/14G06F17/11G06F119/14
CPCG06F30/20G06F17/141G06F17/15G06F17/11G06F2119/14
Inventor范立峰卫秀文江枫王梦
OwnerBEIJING UNIV OF TECH