Test method of bonding characteristic of disintegrated soft rock and concrete and test sample

A test method and concrete technology, applied in the field of geotechnical engineering, can solve problems such as inability to conduct tests, inapplicability, soft rock fracture, etc., and achieve the effects of ensuring accuracy, reducing damage, and preventing disintegration

Active Publication Date: 2017-08-18
HEFEI UNIV OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

From the mechanical properties of disintegrated soft rock, it can be seen that the previous method of testing hard rock is not suitable for the test of the shear properties of the interface between disintegrated soft rock and concrete. For example, hollow rock samples cannot be produced by mechanical equipment shape, because in the production process, the small vibration of the machine will cause the soft rock to break; if the concrete is poured in the soft rock, the rock sample will be destroyed before the test due to the disintegration reaction with the soft rock during the pouring of the concrete. make the test impossible
For example, Chinese patent document CN 201610255076A discloses a method for testing the shear strength of the bonded interface between rock and concrete. In this method, concrete is poured into hollow rock to form a test sample. This test method is suitable for soft rock, especially when it meets water. Obviously not suitable for disintegrating soft rocks

Method used

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  • Test method of bonding characteristic of disintegrated soft rock and concrete and test sample
  • Test method of bonding characteristic of disintegrated soft rock and concrete and test sample
  • Test method of bonding characteristic of disintegrated soft rock and concrete and test sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of soft rock-concrete test specimens:

[0042]S1. Making soft rock blocks: select rough soft rocks, and first cut them with a wire saw to form a small intermediate sample, so that the length and width of the intermediate sample are respectively 2.0-2.0-2.0-2.0-2.0 larger than the length and width of the cuboid-shaped soft rock block A 3.0cm, the height of the intermediate sample is 2.0-4.0cm larger than the height of the cuboid soft rock block A, and then the intermediate sample is gradually cut into the size of the soft rock block A with a utility knife. When the size of the intermediate sample is close to When the size of the soft rock block A is larger than the size of the soft rock block A such as the size of the intermediate sample, use a trowel to smooth the circumferential side of the soft rock block A, and the trowel is used for grinding The grinding surface of the soft rock block A is provided with criss-cross shallow grooves, and the area of ​​the ...

Embodiment 2-1

[0047] Select two groups of different soft rocks to prepare the test sample 1 and the test sample 2 to carry out the interface shear characteristic test, the soft rock block A and the concrete block B in the test sample 1 and the test sample 2 are cuboids, The shape of the end surface of the soft rock block A is square, and the specific test process is as follows:

[0048] Test preparation: in the as figure 2 The tester platform D shown is placed with a bottom pad C with a cylindrical cavity, the upper side of the bottom pad C is provided with a horizontal receiving pad, and the middle part of the receiving pad is provided with a bottom pad that is compatible with the bottom pad. The through hole corresponding to the cylindrical cavity of C; then place the test sample after drying at 105°C on the receiving pad, and place the loading column E on the upper end surface of the test sample , the axes of the bottom pad C, the receiving pad, the test sample, and the loading column ...

Embodiment 2-2

[0054] Then select two groups of different soft rocks to prepare test sample 3 and test sample 4 to carry out the interface shear characteristic test. When different from the embodiment 2-1, the test sample is saturated with water before the test. Treatment, other test procedures are the same as above.

[0055] In the test, the relationship curve between the bond stress τ and the bond-slip displacement value S at the interface of two groups of test samples is obtained as follows: Figure 5 , 6 shown.

[0056] Depend on image 3 , 4 , 5, 6, it can be seen that the S-curve of bond stress τ-bond slip displacement value at the interface roughly includes three parts, namely elastic stage, softening stage and friction stage. The elastic stage is mainly the chemical bonding force between the rock and concrete interface. In this stage, the bond stress at the interface increases with the increase of the bond-slip displacement, and it increases almost linearly. The bond stress at th...

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Abstract

The invention relates to a test method of the bonding characteristic of disintegrated soft rock and concrete and a test sample. The test method comprises the following steps of: manufacturing the test sample, mounting the test sample and an instrument, carrying out test loading and data processing, and the like. The test sample is obtained by pouring a concrete block adhered to a soft rock block integrally around the cuboid or cylindrical soft rock block. The test method comprises the followings steps of: putting the test sample through drying treatment or water-saturation treatment on a carrying gasket; then applying a load through a loading column; and recording the loading values P at different moments and a bonding sliding displacement value S of the soft rock block and the concrete block till the interface of the soft rock block and the concrete block is sheared and destroyed, so as to acquire the bonding characteristic and shear strength data of the soft rock block and the concrete after the soft rock is disintegrated. The test method provided by the invention effectively solves the problem of an indoor test of the bonding characteristic of easily softened or disintegrated soft rock and concrete. In addition, the test is easy to operate, high in sample manufacturing success rate, and objective and accurate in test data.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a test method and a test sample for the bonding characteristics of disintegrated soft rock and concrete Background technique [0002] In the field of pile foundation engineering, the study of the shear characteristics and friction properties of the interface between rock mass and pile foundation has important guiding significance for the selection and design of pile foundation types. The method for existing test rock and concrete interface shear characteristic mainly contains following two kinds: 1. make hollow rock sample, fill concrete test sample in the cavity of hollow rock sample, make test sample, afterwards Shearing by a press; 2. Make a test sample with a single-sided overlap between rock and concrete, and then shear it by a press. [0003] Disintegrated soft rock is widely distributed in my country, accounting for about 8.61% of the total land area of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N19/04
CPCG01N1/28G01N19/04
Inventor 姚华彦崔绍军刘鹤陈清张振华
Owner HEFEI UNIV OF TECH
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