Method and device for testing shear strength of rock and concrete bond interface

A technology of shear strength and concrete, applied in the field of geotechnical engineering, can solve the problems of high performance requirements of testing machines, high cost, and many concrete raw materials, and achieve the effect of simple and easy operation, scientific and reasonable equipment, and less raw materials

Inactive Publication Date: 2016-07-13
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the traditional indoor testing method has many disadvantages, such as the time-consuming and labor-intensive processing of large-scale rock test blocks and high cost, the need for more raw materials such as concrete, high performance requirements for testing machines, and high testing costs.

Method used

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  • Method and device for testing shear strength of rock and concrete bond interface
  • Method and device for testing shear strength of rock and concrete bond interface
  • Method and device for testing shear strength of rock and concrete bond interface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A. Make hollow rock sample 1, hollow rock sample 1 is marble, hollow rock sample 1 has an outer diameter of 100mm and an inner diameter of D 2 The concrete test sample 2 is filled in the cavity of the hollow rock sample 1, and the raw material and the ratio of the concrete test sample 2 are water: cement: fine sand = 0.4:1:1, filling After completion, vibrate and compact on a vibrating table, and flatten the upper and lower ends of the concrete test sample 2 to make a test sample composed of a hollow rock sample 1 and a concrete test sample 2;

[0035] B. Place the test sample in the curing room for curing, the curing temperature is 35°C, the humidity is 80%, and the curing time is 14 days;

[0036] C. Place the cured test sample on the measuring table 3, and make the test sample coincide with the center axis of the measuring table 3; the outer diameter of the measuring table 3 is 150mm, and the cylindrical groove diameter of the measuring table 3 is 53mm; the loading colu...

Embodiment 2

[0040] A. Make hollow rock sample 1, hollow rock sample 1 is marble, hollow rock sample 1 has an outer diameter of 100mm and an inner diameter of D 2 The concrete test sample 2 is filled in the cavity of the hollow rock sample 1, and the raw material and the ratio of the concrete test sample 2 are water: cement: fine sand = 0.25:1:1, filling After completion, vibrate and compact on a vibrating table, and flatten the upper and lower ends of the concrete test sample 2 to make a test sample composed of a hollow rock sample 1 and a concrete test sample 2;

[0041] B. Place the test sample in the curing room for curing, the curing temperature is 35°C, the humidity is 80%, and the curing time is 14 days;

[0042] C. Place the cured test sample on the measuring table 3, and make the test sample coincide with the center axis of the measuring table 3; the outer diameter of the measuring table 3 is 150mm, and the cylindrical groove diameter of the measuring table 3 is 53mm; the loading col...

Embodiment 3

[0046] A. The hollow rock sample 1 is made, the hollow rock sample 1 is granite, the outer diameter of the hollow rock sample 1 is 100mm, and the inner diameter is D 2 The concrete test sample 2 is filled in the cavity of the hollow rock sample 1, and the raw material and the ratio of the concrete test sample 2 are water: cement: fine sand=0.4:1:1, filling After completion, vibrate and compact on a vibrating table, and flatten the upper and lower ends of the concrete test sample 2 to make a test sample composed of a hollow rock sample 1 and a concrete test sample 2;

[0047] B. Place the test sample in the curing room for curing, the curing temperature is 35°C, the humidity is 80%, and the curing time is 14 days;

[0048] C. Place the cured test sample on the measuring table 3, and make the test sample coincide with the center axis of the measuring table 3; the outer diameter of the measuring table 3 is 150mm, and the cylindrical groove diameter of the measuring table 3 is 53mm; ...

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Abstract

The invention relates to a method and device for testing shear strength of a rock and concrete bond interface and belongs to the technical field of geotechnical engineering.The method comprises the following steps: making a hollow rock sample, filling a cavity of the hollow rock sample with a concrete test sample, and making a test sample; placing the test sample in a curing chamber for curing; placing the cured test sample on a determination table, lacing a loading column on the upper end of the test sample, and axially aligning the loading column with the test sample; applying a vertical load until a bond interface between the concrete test sample and the hollow rock sample breaks completely, and recording in real time, vertical load and displacement data; analyzing test data, calculating shear strength of the bond interface according to an equation: Tau=Fmax/(Pi-D2-H), and drawing a test curve, wherein Tau is bond interface shear strength, Pi is the ratio of the circumference of a circle to its diameter, D2 is inner diameter of the hollow rock sample, H is height of the hollow rock sample, and Fmax is maximum value of the vertical load.

Description

technical field [0001] The invention relates to a method and a device for testing the shear strength of a rock-concrete bonding interface, belonging to the technical field of geotechnical engineering. Background technique [0002] Lining is a support type widely used in industries such as transportation, water conservancy and mining, and concrete is one of the most widely used lining structures. After the tunnel / roadway is excavated, it is necessary to spray the concrete lining in time to prevent further weathering of the surrounding rock, and to give the surrounding rock a certain support and confining pressure to relieve the stress concentration inside the surrounding rock. The degree of bonding between concrete and surrounding rock surface directly affects the function of concrete lining, so the shear strength of the bonded interface between concrete and rock has become an important index for evaluating the mechanical properties of lining. Indoor testing is the main mean...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24
Inventor 徐荣超吕晓春黄志全李日运房敬年王安明李幻贾景超
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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