Description method of disintegration characteristics based on soft rock site state

A disintegration and on-site technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the phenomenon of disintegration of argillaceous rock that is difficult to reflect on-site, loss of disintegration flow, and one-sided disintegration that is difficult to reflect on-site and other issues to achieve the effect of enriching the evaluation index information

Active Publication Date: 2018-06-12
HOHAI UNIV
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  • Description
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AI Technical Summary

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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  • Description method of disintegration characteristics based on soft rock site state
  • Description method of disintegration characteristics based on soft rock site state
  • Description method of disintegration characteristics based on soft rock site state

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 blocks

[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 Figure 6 , Figure 7 . According to the particle distribution characteristic curve, determine the critical particle size d 60 , that is, particles smaller than this particle si...

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Abstract

The invention provides a description method of disintegration characteristics based on a soft rock site state. Based on a disintegration evolution process of a site argillaceous rock state, the disintegration characteristics are described from various angles, specifically four aspects such as a influence depth, fracture rate, particle distribution characteristics and disintegration rate. The influence depth is a one-dimensional linear variable for describing a one-way influence range of disintegration; the fracture rate is a two-dimensional plane variable for describing a boundary feature index of plane disintegration particles and can indirectly reflect particle sizes and distribution; the particle distribution characteristic are three-dimensional variables, and the particle sizes and distribution in the disintegration depth are described; the disintegration rate is a particle distribution value comprehensively determined of a disintegration object. Therefore, the influence depth, theplane fracture rate, the disintegration object particle size distribution and the disintegration rate are comprehensive descriptions of the disintegration characteristics corresponding to developmentstages of disintegration. Compared with the prior art, the method has the advantages that various indexes of the disintegration process of extremely soft rocks can be systematically reflected, and description parameters are closer to actual rock slope disintegration phenomenons.

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 Applications(China)
IPC IPC(8): G06F17/50
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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