Judgment method of anisotropic relative relaxation of surrounding rocks in columnar jointed basalt chambers
A technology of columnar joints and anisotropy, which is applied in the direction of measuring devices, instruments, and wave/particle radiation, can solve the problems of failure to consider the influence of anisotropy of the original surrounding rock, large thickness of the relaxation zone, and aggravated degree of fragmentation, etc.
A technology of columnar joints and anisotropy, which is applied in the direction of measuring devices, instruments, and wave/particle radiation, can solve the problems of failure to consider the influence of anisotropy of the original surrounding rock, large thickness of the relaxation zone, and aggravated degree of fragmentation, etc.
CN104236489BActive Publication Date: 2017-05-31POWERCHINA HUADONG ENG COPORATION LTD
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[0015] This embodiment combines figure 1 To illustrate, on a section of a certain columnar jointed basalt chamber 1, the original and excavated properties of the roof, floor, and side walls on both sides (including the left and right walls) are anisotropic.
[0016] The specific steps of this embodiment are as follows:
[0017] S1. At a certain section of the chamber 1, according to the anisotropic physical and mechanical properties of the columnar joint basalt, three wave velocity test boreholes 2 are drilled on the top plate, the bottom plate, and the side walls on both sides; they are located in the same direction (top plate, The three wave velocity test boreholes 2 on the bottom plate, the left wall or the right wall) are evenly distributed, and the hole depth requirements are relatively deep (generally about 10m), and the depth extending into the original undisturbed rock mass is not less than 2m (the present embodiment drills The depth of the hole extending into the ori...
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The invention relates to a method for judging the anisotropic relative relaxation thickness of surrounding rock of a chamber of a columnar jointing basalt so as to quickly and accurately judge the anisotropic relative relaxation thickness of the surrounding rock. According to the technical scheme, the method comprises the steps that 1, a top plate, a bottom plate and two side walls of a certain section of the chamber are respectively provided with a group of testing drill holes; 2, wave velocity testing is conducted through a cross hole method, and a wave velocity value tested within the range 2m away from the bottom of each drill hole serves as an original undisturbed wave velocity Vpo of the columnar jointing basalt, and wave velocities actually measured within the other ranges of the drill holes are subjected to statistics according to different depths; 3, according to the formula Kvb=(Vpm / Vpo)<2>=0.75-0.45, the relaxation disturbance wave velocity Vpm of the top plate, the relaxation disturbance wave velocity Vpm of the bottom plate and the relaxation disturbance wave velocity Vpm of the two side walls are solved respectively, the Vpms are matched with the wave velocities actually measured in the second step in the corresponding directions, and then the anisotropic relative relaxation thickness is obtained. The method is applied to the field of hydraulic anisotropic surrounding rock chamber engineering.
Description
technical field [0001] The invention relates to a wave velocity quantitative evaluation method for the relative relaxation degree of the anisotropic surrounding rock of a columnar joint basalt chamber, which is mainly applicable to the field of hydraulic anisotropic surrounding rock chamber engineering. Background technique [0002] Columnar jointed basalt bodies are widely distributed in the hydropower development areas of Southwest my country, such as the giant hydropower stations Baihetan, Xiluodu and Ertan Hydropower Stations in my country, etc., especially the Jinsha River Baihetan Hydropower Station under construction, columnar jointed basalt has become the main hydropower project It is one of the surrounding rocks of hydraulic tunnels and the foundation rock mass of dams. In engineering, if the rock mass with significant anisotropy is assumed to be isotropic for research, it will inevitably cause large errors. Therefore, the analysis of the surrounding rock of the cham...
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Patent Timeline
31 May 2017
Publication
CN104236489B
- IPC
- G01B15/02
- Inventors
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