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Similar material for loose granular stratum and preparation method of similar material

A technology similar to materials and granules, applied in the direction of material inspection products, soil material testing, etc., can solve the problems of progressive failure law of loose granule strata, overall deformation and stress transmission error of the stratum, difficulty in meeting the similarity ratio requirements of permeability coefficient, etc. , to achieve the effects of weak cementation, high permeability and strong adjustability

Pending Publication Date: 2022-05-13
HEBEI PROVINCIAL COMM PLANNING & DESIGN INST +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] These materials are ideal for simulating relatively homogeneous rock formations, clay and loess formations, but in the model tests of tunnels, foundation pits and seepage and precipitation in loose granular formations, the traditional similar materials have great differences. The main defects are as follows: (1) It is impossible to simulate the discrete type of gradation particles in the loose granular strata, which causes errors in the overall deformation and stress transfer of the stratum; (2) It is impossible to simulate the loose granular strata The gradual failure law of the formation in the unsupported or weakly supported form; (3) It is difficult for the permeability coefficient of this type of material to meet the similarity ratio requirements in the seepage model test, and the material is prone to physical or chemical damage after immersion. Changes in the test results caused serious deviations

Method used

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  • Similar material for loose granular stratum and preparation method of similar material
  • Similar material for loose granular stratum and preparation method of similar material
  • Similar material for loose granular stratum and preparation method of similar material

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preparation example Construction

[0049] The preparation method of the similar material of the above-mentioned loose granular formation is described in detail below, including the following steps:

[0050] Step 1. Obtain parameter information of the loose granular strata according to the survey data of the loose granular strata.

[0051] Specifically, before the test is carried out, based on the stratum survey data obtained at the engineering site, it is analyzed and analyzed to obtain information on the gradation composition, water content, elastic modulus, cohesion, internal friction angle, and permeability coefficient of the loose granular strata, as Basic information on the preparation of similar materials.

[0052] Step 2. Determine the type of similar material according to the gradation composition of the loose granular formation, prepare a set amount of mixed dry material sample according to the proportion corresponding to the similar material type, and then adjust the water content of the mixed dry mat...

Embodiment 1

[0092] To carry out a similar model test of unsupported tunnel excavation for a boulder stratum, a total of 200kg of test materials need to be prepared. The preparation and adjustment process of similar materials are shown in the following steps:

[0093] Step 1: According to the survey report of a boulder formation, the gradation composition of the formation material belongs to the skeleton void type, and the density is 2.01g / cm 3 , the elastic modulus is 25MPa, the internal friction angle is 42.0°, the cohesive force is 10.02kPa, the maximum particle size is 48cm, and the moisture content is 5.8%. According to the proportion of similar materials corresponding to the skeleton void type, the mass percentage of each material in the similar materials is preliminarily determined as: 35.7% of 2-4 mesh quartz sand: 34.8% of 10-20 mesh quartz sand: 9.7% of 20-40 mesh Quartz sand: 10.5% of 150-mesh barite powder: 9.3% of 600-mesh barite powder.

[0094] Step 2: Prepare a 5kg sample ...

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Abstract

The invention discloses a similar material for a loose granular stratum and a preparation method thereof, the similar material is composed of quartz sand of 2-4 meshes, quartz sand of 10-20 meshes, quartz sand of 20-40 meshes, barite powder of 150 meshes and barite powder of 600 meshes in different contents, and three types of loose granular similar materials of suspension dense type, skeleton dense type and skeleton void type are formed. The similar material for the loose granular strata has the advantages of high similarity, simplicity in preparation, high adjustability, low manufacturing and using cost, reusability and the like, and can be used for foundation pit and tunnel excavation damage tests, strata stress and deformation research tests and rainfall and penetration tests in the strata; simulation of characteristics of discontinuity, discreteness, high permeability, weak cementation and the like of the stratum structure is realized.

Description

technical field [0001] The invention relates to the field of material model tests, in particular to a similar material for loose granular strata and a preparation method thereof. Background technique [0002] The use of model tests can narrow down the natural prototypes to be observed, shorten the observation process and isolate some factors in the extraction process, so that it is easy to compare, observe and discover the causal relationship. In recent years, with the increase in the construction of tunnels and foundation pits in loose granular strata such as floating pebbles and sand pebbles, more and more problems need to be studied in loose granular strata, and more and more model tests for loose granular strata . The loose granular formation is composed of boulders, pebbles, medium-coarse sand and soil with different particle sizes, and has special properties such as large permeability coefficient, strong discrete type, not easy to deform, poor cementation, and large c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 秦祎文昝文博杨星蕊秘向博李志宏冯志华路舒雯邓新亮赖金星王东明
Owner HEBEI PROVINCIAL COMM PLANNING & DESIGN INST
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