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A description method of disintegration characteristics based on field state of soft rock

A disintegration and on-site technology, applied in special data processing applications, design optimization/simulation, etc., can solve the problems of in-situ argillaceous rock disintegration, disintegration flow loss, and difficult scientific and reasonable characterization of soft rock mass disintegration Solving problems such as features to achieve the effect of enriching evaluation index information

Active Publication Date: 2021-05-28
HOHAI UNIV
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Problems solved by technology

Therefore, it is difficult to scientifically and reasonably characterize the disintegration characteristics of complex soft rock mass with one parameter.
[0005] Problems with existing methods: The single parameter description method is only applicable to unconfined and indoor test results, and it is difficult to reflect the on-site argillaceous rock disintegration phenomenon during the test process. The specific problems are:
[0006] (1) Under the condition of natural slope, the bedrock is a semi-infinite space body, which is characterized by dehydration on one side of the top, limited lateral deformation, and disintegration on one side of the top when it encounters water; while the rock block disintegration in the laboratory test is multi-directional, so A single parameter suitable for the existing unconfined rock block disintegration test is difficult to reflect the phenomenon of single-sided disintegration in the field;
[0007] (2) The disintegrated matter on the natural slope is eroded and lost, and a single parameter cannot evaluate the overall disintegration situation at the site;

Method used

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  • A description method of disintegration characteristics based on field state of soft rock
  • A description method of disintegration characteristics based on field state of soft rock
  • A description method of disintegration characteristics based on field state of soft rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Description of the Results of the Confined Disintegration Test with Non-fixed Volume

[0050] The undisturbed samples of argillaceous sandstone and mudstone are all taken from the K42+040 pilot project of diverting the Yangtze River to the Huaihe River, in the middle of the channel, at a depth of 12-13m. Determination of the secondary cycle disintegration resistance index I of the rock by the standardized disintegration resistance test method d2 Both are less than 2.5%, which means strong disintegration, and the difference cannot be distinguished. On this basis, this experiment is to study the influence of confinement on the results of disintegration test.

[0051] Such as figure 1 Shown:

[0052] (1) Sieving of disintegrated matter.

[0053] The test results of two groups of argillaceous sandstone and mudstone samples. Such as figure 1 As shown, the sieving results can significantly distinguish the disintegration characteristics of argillaceous sandsto...

Embodiment 2

[0078] Example 2: Description of the results of the confining disintegration test at a fixed volume under dry-wet cycle conditions

[0079] Since the sample has a low diagenetic degree and is a weakly cemented argillaceous very soft rock with some characteristics of rock and soil, the original sample of the ring cutter can be prepared according to the preparation method of the original geotechnical sample, such as image 3 shown. The confinement is realized by the ring knife, and the saturator is used to fix the ring knife sample when immersed in water, such as Figure 4 . The surface information of the rock sample is collected by using a camera and a crack width measuring instrument to measure the crack width on the rock sample surface. When taking pictures, in order to ensure that the distance, location, and external light environment of each shot are consistent, the camera is placed at a height of about 5cm in the center of the ring knife-like surface to shoot, and all sh...

Embodiment 3

[0087] Embodiment 3: Description of research results of static disintegration test of rock block

[0088] Drying quality of mudstone initial rock sample block D 0 =260.10g; drying quality of the initial rock sample block of argillaceous sandstone D 0 = 245.00 g. Starts to disintegrate after immersion in water. Particle analysis of the disintegrated product was performed after the disintegration was completed.

[0089] A. Determination method: Pass the sample through standard sieves with apertures of 60mm, 40mm, 20mm, 10mm, 5mm, 2mm, 1mm, 0.5mm, and 0.075mm, sieve and weigh, and obtain the disintegration samples that pass through different standard sieve apertures. The dry weight of the material is shown in Table 4 and Table 5. The particle distribution characteristic curve is obtained, such as Image 6 , Figure 7 . According to the particle distribution characteristic curve, determine the critical particle size d 60 , that is, particles smaller than this particle size...

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Abstract

The present invention provides a method for describing the disintegration characteristics based on the on-site state of soft rock, based on the disintegration evolution process of the on-site argillaceous rock state, and describing the disintegration characteristics from multiple angles: impact depth, fracture ratio, particle distribution characteristics, The disintegration rate is described in four aspects. Depth of influence is a one-dimensional linear variable, which describes the one-way impact range of disintegration; fracture rate is a two-dimensional plane variable, which describes the characteristic index of plane disintegration particle boundaries, which can indirectly reflect particle size and distribution; particle distribution characteristics are three-dimensional variables, which can be Describe the particle size and distribution within the disintegration depth; the disintegration rate is a comprehensive determination of the particle distribution value of the disintegration product. Therefore, the impact depth, plane crack rate, disintegration particle distribution, and disintegration rate are the disintegration characteristics corresponding to the comprehensive description of the disintegration development stage. Compared with the prior art, the beneficial effect of the present invention lies in that it can systematically reflect various indexes of the disintegration process of the extremely soft rock, making the description parameters closer to the disintegration phenomenon of the actual rock slope.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a method for describing the disintegration characteristics of extremely soft rock based on the field state of the soft rock. Background technique [0002] Article 3.3.3 of "Engineering Rock Mass Classification Standard" (GB50218T-2014) stipulates that rocks with natural humidity uniaxial compressive strength less than 15MPa and greater than 5MPa are called soft rocks; less than 5MPa are called extremely soft rocks; Article 4.4.5 of the Standard for Body Identification and Description (CECS239-2008) stipulates that rocks with natural humidity uniaxial compressive strength less than 15MPa and greater than 5MPa are called soft rocks; less than 5MPa and greater than 1MPa are called very soft rocks. Rocks with natural moisture uniaxial compressive strength less than 1 MPa are called extremely soft rocks. Argillaceous rock, including argillaceous sandstone, sandy mudstone,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/00
Inventor 曹雪山赖喜洋额力素李国维袁俊平吴建涛殷宗泽张坤勇
Owner HOHAI UNIV
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