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Calculation method for thickness of tunnel surrounding rock loose circle

A technology of surrounding rock loosening circle and calculation method, applied in instruments, measuring devices, using ultrasonic/sonic/infrasonic waves, etc., can solve the problems of high subjectivity, lack of theoretical basis, ambiguity, etc., and achieve the effect of objective judgment standards

Active Publication Date: 2019-05-14
XIAN TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common disadvantages of the above three methods are their subjectivity, ambiguity, and lack of theoretical basis.

Method used

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  • Calculation method for thickness of tunnel surrounding rock loose circle
  • Calculation method for thickness of tunnel surrounding rock loose circle
  • Calculation method for thickness of tunnel surrounding rock loose circle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] The surrounding rock of a certain tunnel is dominated by gneiss, mainly composed of feldspar and quartz, with a medium-coarse grained metamorphic structure.

[0064] 1) Rock laboratory test

[0065] The rock samples used in the test were collected at the test position of the surrounding rock loose circle. This section belongs to grade III surrounding rock, which is dry and slightly weathered gneiss. The integrity of the surrounding rock is good without obvious cracks, and the rock strength is relatively high. Since rock is a natural heterogeneous material, in order to prevent excessive dispersion of test data, rock test blocks with similar structures and occurrences were selected. According to the "Engineering Rock Mass Test Method Standard", a cylindrical test block with a diameter of 50mm and a height of 100mm is made, a total of 10 pieces, such as figure 1 shown.

[0066]The RSM-SY5(T) non-metallic acoustic wave testing system (accuracy 0.01km / s) produced by Wuhan ...

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Abstract

The invention relates to a method for calculating the thickness of a loosening circle of a tunnel surrounding rock. By the introduction of the concept of a broken rock integrity coefficient Rv and a loosening circle integrity coefficient Lv, the broken state of rock mass in a loosening circle of the surrounding rock is quantified. A quantitatively defined value of the thickness of the loosening circle is obtained by an indoor test of the rock. Then, the thickness of the loosening circle of the surrounding rock is judged by combining acoustic method field test conditions. The invention is based on the forming principle and nature of the loosening circle, a judgment standard formulated by this method is objective and real, and the method has universality and generalization.

Description

technical field [0001] The invention relates to a quantitative method for determining the thickness of a loose circle of surrounding rock of a tunnel, in particular to a method for calculating the thickness of a loose circle of surrounding rock of a tunnel. Background technique [0002] When the tunnel is excavated, the original stress state of the surrounding rock is destroyed to form a secondary stress field, resulting in stress concentration. At this time, a "broken zone" surrounding the tunnel will be formed, which is customarily called the surrounding rock loose circle. The determination of the thickness of the surrounding rock loose circle is very important for the excavation and support design of the tunnel, and it is the guarantee for the safe construction of the tunnel. [0003] At present, the methods for determining the thickness of the loose ring mainly include elastic-plastic theoretical calculation, numerical simulation analysis, and field actual test. Compare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B17/02
CPCG01B17/02
Inventor 王睿邓祥辉张进增袁岽洋赵帮轩
Owner XIAN TECH UNIV