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Point loading test analysis method based on surrounding rock classification of super-large section tunnel

A technology for grading surrounding rocks and super-large sections, which is applied to the analysis of materials, the use of stable tension/pressure to test the strength of materials, and measuring devices. It can solve the problems of large dispersion and the inability to accurately determine the grade of surrounding rocks of large-section tunnels. , to achieve the effect of improving accuracy, high guiding significance, high accuracy and credibility

Inactive Publication Date: 2017-05-10
CHINA UNIV OF MINING & TECH (BEIJING) +1
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Problems solved by technology

At present, the tunnel excavation section is getting larger and larger, and the surrounding rock conditions are complex. Different grades of surrounding rock grades may appear on the tunnel face at the same time. The Rc obtained from the existing point load test has a large dispersion, and it is impossible to accurately determine the large-section tunnel. The grade of surrounding rock

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  • Point loading test analysis method based on surrounding rock classification of super-large section tunnel
  • Point loading test analysis method based on surrounding rock classification of super-large section tunnel
  • Point loading test analysis method based on surrounding rock classification of super-large section tunnel

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[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...

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Abstract

The invention discloses a point loading test analysis method based on surrounding rock classification of a super-large section tunnel. The point loading test analysis method comprises the following steps: obtaining an excavation section area S of a working face; according to different excavation section areas S of a tunnel, adopting N=S / 2 irregular rock block bodies at places near a construction site of the working face; carrying out a point loading test on the irregular rock block bodies on the construction site; calculating according to an engineering rock body test method standard to obtain Is(50); carrying out conversion on the Is(50) obtained by step (4) according to specifications, so as to obtain N Rcs; drawing a histogram, wherein horizontal ordinates are the Rcs obtained by conversion for the point loading test in step (5), the width of the histogram according to the size of extreme difference is reasonably determined, and vertical coordinates are frequencies of corresponding Rc values; carrying out multi-peak normal distribution fitting according to the histogram obtained by step (6) to obtain M normal peaks and the Rc values corresponding to M peak values; determining different surrounding rock rigidity indexes according to the Rc values in ste.p (7), and determining surrounding rock classification of the super-large section tunnel.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a point load test analysis method based on classification of super large section tunnel surrounding rock. Background technique [0002] The geological conditions along the ultra-large-section tunnel are relatively complex. During the tunnel construction, the grade of the surrounding rock exposed on the face of the site is not completely consistent with the classification of the surrounding rock in the design stage. Therefore, it is necessary to analyze the surrounding rock exposed on the face of the construction stage. , to determine the indicators of the surrounding rock classification in the construction stage. The geological parameters for surrounding rock classification in the construction stage can be obtained directly from the working face. The parameters obtained in this way are the most direct and objective, and the surrounding rock classification based on the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0076G01N2203/0252G01N2203/0262
Inventor 王春河江华殷明伦江玉生樊祥喜
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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