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Method for preparing columnar jointed rock mass model containing blind joints and interlayer shear belts
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A technology of interlayer staggering and columnar joints, applied in the preparation of test samples, etc., can solve the problems that have not been raised, and achieve the effect of simple materials, simple operation and low cost
Inactive Publication Date: 2016-04-13
HOHAI UNIV
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[0005] The application numbers are 2015100600984, 201407443937 and 2014105643869 respectively, all of which are for the preparation of regular and irregular columnar jointed rock models. Some new methods have been proposed, and some good beneficial effects have been obtained, but no good and effective preparation and on-site rich The model corresponding to the columnar joint rock mass with hidden joints and interlayer dislocation zone is proposed, so the prepared model is more in line with the site, and the obtained model analysis can better reflect the mechanical characteristics of the site
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Embodiment 1
[0039] 1) At the columnar rock mass site, take multiple columns, and count the shape, size and size of the columns; make statistics and record the characteristic information of the hidden joints inside the columns, and take the columns to make standard rock samples. The rock mechanical parameters were tested by laboratory tests;
[0040] 2) According to the shape, size and dimension of the column obtained by statistics, the geometric similarity ratio C of the experimental model is used 1 , bulk density similarity ratio C Y , According to the rock mechanical parameters obtained from laboratory tests, the strength similarity ratio C R =C 1 ×C Y , Elastic modulus similarity ratio C E =C 1 ×C Y , and use this to determine the specific size of a single column and record its different order with labels. The raw materials and proportions of similar materials in this example are: cement: sand: water = 1:1:0.5;
[0041] 3) Prepare a specific iron sheet from the shape, size and s...
Embodiment 2
[0051] The difference from Example 1 is as follows:
[0055] In step 8), the curing time is 36 hours, and the glue used is epoxy resin;
[0056] In step 10), the characteristics of the interlayer dislocation zone used are: the inclination angle is 30°, the thickness is 15 mm, and the shear position is in the middle.
[0057] In step 11), the adhesive used is cement: water = 2:1
Embodiment 3
[0059] The difference from Example 1 is as follows:
[0060] The model material in step 2) is cement: sand: water = 2:3:1;
[0061] In step 4), the thickness of the iron sheet is 3mm;
[0063] In step 8), the curing time is 48 hours, and the glue used is epoxy resin;
[0064] In step 10), the adopted interlayer dislocation zone is characterized by two parallel interlayer dislocation zones: the inclination angle is 30°, the thickness is 15 mm, and the interval is 35 mm. Both parallel interlayer dislocation zones run through the middle of the shear. Location.
[0065] In step 11), the adhesive used is cement: water = 2:1.
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Abstract
The invention discloses a method for preparing a columnar jointed rock mass model containing blind joints and interlayer shear belts. According to the method, a similar material is utilized to prepare the model to simulate columnar jointed rock mass of an engineering field; oats of different thicknesses and sizes are added in the stirring process of the similar material so as to simulate different characteristics of the blind joint; and interlayer shear belt characteristics including inclination angles, quantities, distances among different interlayer shear belts and mutual included angles of the interlayer shear belts are also arranged. The method is simple in preparation process and easy to operate and overcomes the disadvantage that incapable drilling-out of a rock sample with interlayer shear belts due to a small size of a laboratory rock sample leads to incapable analysis of influence of random blind joints and interlayer shear belts on the mechanical properties of the columnar jointed rock mass in virtue of an original core sample. Columnar jointed rock mass models with different blind joint characteristics, different interlayer shear belt characteristics and different joint thicknesses prepared by using the preparation method can accurately simulate the distribution characteristics and mechanical properties of on-site columnar jointed rock masses.
Description
technical field [0001] The present invention relates to the engineering safety problem in the fields of rock mechanicsengineering and hydropower engineering, with columnar joint rock mass rich in hidden joints and interlayer dislocation zones as the main engineering object, and specifically relates to the use of similar material models to determine random joints and layers The influence of the interlayer dislocation zone on the strength of the columnar joint rock mass is mainly a method for preparing a columnar joint rock mass model with hidden joints and interlayer dislocation zones. Background technique [0002] Columnar joint rock mass is one of the special rock mass, which is a unique structure of basalt. It is often cut into prismatic columns of different shapes and sizes by columnar joints. In the basalt part of the dam foundation of the Baihetan HydropowerStation, not only columnar joint rock mass is developed, but also several interlayer dislocation zones run throu...
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