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Testing device and testing method for simulating hydraulic fracture characteristic of concrete bedrock contact surface

A technology of hydraulic splitting and test device, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, strength characteristics, etc. The effect, the process is simple and fast effect

Active Publication Date: 2017-02-22
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing studies generally use hollow cylindrical concrete or cement mortar specimens to carry out concrete or rock hydraulic splitting tests, and there are few studies on indoor tests on the weak layer of concrete-dam foundation contact surface

Method used

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  • Testing device and testing method for simulating hydraulic fracture characteristic of concrete bedrock contact surface
  • Testing device and testing method for simulating hydraulic fracture characteristic of concrete bedrock contact surface
  • Testing device and testing method for simulating hydraulic fracture characteristic of concrete bedrock contact surface

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preparation example Construction

[0055] The mold is used for the preparation of the concrete bedrock test piece, and the concrete bedrock test piece has an initial crack of the test piece at the contact surface of the concrete bedrock.

[0056] The mold includes a bottom plate and four side walls, and the side walls and the bottom plate are detachably connected; the four side walls and the bottom plate are enclosed to form a central cavity, and the shape of the central cavity is the same as that of the concrete bedrock test piece.

[0057] The mold is preferably made of plastic material, and the mold is preferably a square box, preferably a cube box in this application, and the side length of the cube box is preferably 150 mm.

[0058] A circular hole is respectively provided at the central parts of the side walls corresponding to the two positions of the mold, and a rotatable disk is arranged in each circular hole, and the radius of the disk is preferably 4-6 cm.

[0059] The center of each disc is provided ...

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Abstract

The invention discloses a testing device and testing method for simulating the hydraulic fracture characteristic of a concrete bedrock contact surface. The testing device mainly comprises a mold, a steel sheet, pressure measuring guide pipes, a water seal fixture, a water pressure loading system, strain gauges, a clip gauge, a computer and the like. A pair of discs are cut in the mold in a central symmetry mode, can rotate and are used for allowing the steel sheet to be inserted into preformed initial cracks with different thicknesses, widths, roughness and angles; the water seal fixture clamps a test piece in a screwing mode through a screw to seal the water pressure, a high-pressure-resistant water guide pipe is connected with a fixture thread center hole formed in the center of a water seal device through a thread connector, the strain gauges are arranged in the development direction of the cracks, and a coloring agent is added into a water tank connected with the high-pressure-resistant water guide pipe to track the propagation trajectory of the hydraulic fracture cracks. The testing device can be used for studying the hydraulic fracture characteristic of the concrete bedrock contact surface, is simple and convenient to operate and can truly reflect the crack propagation characteristic among contact surfaces of different materials.

Description

technical field [0001] The invention relates to a test device and a test method for analyzing the characteristics of hydraulic splitting, in particular to a test device and a test method for simulating the hydraulic splitting characteristics of the concrete bedrock contact surface. Background technique [0002] With the rapid development of dam building technology in our country, a large number of high concrete dams have been put into operation or will be constructed soon. The bedrock is formed through long-term accumulation and evolution, and the concrete dam body is formed by artificial materials using certain pouring methods in a short period of time. Due to the influence of temperature, pouring technology, contact surface effect, etc., there will inevitably be a gap between the concrete dam body and the concrete dam. Cracks are formed between the contact surfaces of the bedrock, and the cracks on the contact surface between the concrete and the dam foundation are filled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N1/28
CPCG01N1/28G01N3/12G01N2203/0019G01N2203/0048G01N2203/0066G01N2203/027G01N2203/0423G01N2203/0682
Inventor 刘得潭甘磊沈心哲曾奕滔郁李丽田振宇李安东甘敏华倩宇任海文
Owner HOHAI UNIV
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