CN109900563B - Shear test method for oversized anchoring structure surface - Google Patents

Shear test method for oversized anchoring structure surface Download PDF

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CN109900563B
CN109900563B CN201910079286.XA CN201910079286A CN109900563B CN 109900563 B CN109900563 B CN 109900563B CN 201910079286 A CN201910079286 A CN 201910079286A CN 109900563 B CN109900563 B CN 109900563B
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oversized
samples
structure surface
boss
bosses
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CN109900563A (en
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杜时贵
刘广建
林杭
雍睿
罗战友
夏才初
胡斌
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Ningbo University
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宁波大学
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Abstract

A shear test method for an oversized anchoring structure surface comprises the following steps: (1) manufacturing a plurality of anchor rod-containing cement-based samples according to the indoor sample similarity ratio principle, wherein the samples are cubes containing bosses, the bosses on the side edges are respectively rectangular, and the rectangular bosses are square; (2) inserting an anchor rod in the sample preparation process, and arranging a high-temperature and high-pressure resistant multifunctional fiber grating sensor; (3) combining the samples into a plurality of sample blocks with series sizes; (4) preparing a shear test loading module matched with a series of oversized samples; (5) judging the stress condition of the boss by utilizing the monitored stress, strain, displacement and acoustic emission information; (6) and (5) repeating the steps (1) to (5) to design the shearing test of the oversized anchoring structure surface containing the triangular lug bosses. The invention improves the matching, rationality and scientificity of test results, solves the problem of difficult installation of oversized samples and reduces the potential safety hazard in the shearing test process.

Description

Shear test method for oversized anchoring structure surface
Technical Field
The invention belongs to the technical field of indoor physical mechanical tests, and particularly relates to a shearing test method for an oversized anchoring structure surface.
Background
The rock slope is closely related to human living environment and geological engineering activities, and is one of the most important natural geological environments. With the dramatic growth of the population and the excessive development of land resources, the slope problem has become one of three global geological disasters (sources) juxtaposed to earthquakes and volcanoes. In the development process of human beings, the rock slopes are not conflicted, influenced and coordinated with each other at any time, so that the mutual dependence is achieved, and some rock slopes become permanent 'artificial natural signs' after undergoing the process from an unstable state to a stable state and are integrated into a geological environment. With the great construction of national infrastructure and the positive advance of western big development strategy, the steep slopes in the fields of hydraulic and hydroelectric engineering, railway engineering, highway engineering and the like are increasing day by day and generate the problem of slope rock stability, and the slope rock anchoring technology is dominant in the reinforcement and support treatment of the steep slopes and is one of the most common, most economical and most effective methods. Rock mass anchoring is an important branch in the field of geotechnical engineering, and the research on the rock mass anchoring performance is the key for success and failure of the rock mass anchoring technology. The rock mass anchoring means that in order to prevent and control landslide, ground subsidence, tunnel collapse and other geological disasters, anchor rods, prestressed anchor rods, anchor cables and other anchoring parts are adopted to improve the stress state of the rock mass and achieve measures of mobilizing and improving the self-strength and self-stability of the rock mass. For large surface mine rock slopes, the instability mode is basically shear slip along the structural plane, so the shear load on the anchoring structural plane cannot be ignored. At present, some scholars adopt large-size concrete or rock test pieces (the size of a structural surface ranges from 30cm multiplied by 30cm to 30cm multiplied by 80 cm) and high-strength steel bars (the diameter ranges from 8 mm to 40mm) to carry out single-joint or double-joint direct shear tests, belong to scale reduction tests, and ignore the influence of the size effect of an anchoring structural surface. Some scholars propose full-scale shear tests, the length of a structural surface reaches several meters or even dozens of meters, the number of required anchor rods reaches dozens of, the shear force reaches thousands of tons, the shear test belongs to an oversized shear test, and the stress of the end of a sample is often concentrated by large stress, so that the diameter of the sample is crushed. Therefore, new shear test designs are needed in terms of specimen stress.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the shear test method for the oversized anchoring structure surface, which can avoid local damage caused by stress concentration generated at the end of an oversized sample, ensure the cooperative stress of an anchor rod, improve the matching property, the reasonability and the scientificity of a test result, solve the problem of difficult installation of the oversized sample, reduce the potential safety hazard in the shear test process, has simple preparation process of a cement-based sample, convenient use, low cost and wide application range, and provides scientific basis for the design of the oversized test.
In order to achieve the purpose, the invention adopts the technical scheme that:
a shear test method for an oversized anchoring structure surface comprises the following steps:
(1) manufacturing a plurality of anchor rod-containing cement-based samples according to the indoor sample similarity ratio principle, wherein the samples are cubes containing bosses, the bosses on the side edges are respectively rectangular, the side length of each sample is 4l, l is more than or equal to 0.4m and less than or equal to 0.8m, the rectangular bosses are squares, the side length is 0.5l, and the distance is l;
(2) inserting an anchor rod in the sample preparation process, carrying out full-length bonding type anchoring, and arranging a high-temperature and high-pressure resistant multifunctional fiber grating sensor, wherein the space between the structural surface and the position near the boss is 0.1m, and the spaces between other positions are 0.2 m;
(3) combining the samples into a series of size multi-block samples, wherein the number of blocks in the shearing direction is n, n is more than or equal to 2 and less than or equal to 10, the number of blocks in the width direction is 2, and the number of blocks in the height direction is 2;
(4) selecting low-alloy high-strength steel according to the national standard (GBT 1591-;
(5) assembling a plurality of body samples and a shear test module, carrying out a shear test on a large-size direct shear apparatus platform, arranging an acoustic emission probe on the surface of the module, and judging the stress condition of a boss by utilizing the monitored stress, strain, displacement and acoustic emission information;
(6) and (5) repeating the steps (1) to (5) to design the shearing test of the oversized anchoring structure surface containing the triangular boss, wherein the triangular boss is an equilateral triangle, and the side length is 0.8 l.
Furthermore, in the step (1), various composite materials such as magnesium ash and the like can be added into the cement base to improve the strength of the cement base.
Still further, in the step (2), the diameter of the anchor rod is 10-40 mm, and the anchoring diameter is 2 times of the diameter of the anchor rod.
Furthermore, in the step (3), if the deformation or the severe fracture of the boss is detected, the size of the boss needs to be increased, and the strength needs to be increased.
Compared with the prior art, the invention can avoid local damage caused by stress concentration generated at the end of the oversized sample, can ensure the cooperative stress of the anchor rod, improves the matching property, the rationality and the scientificity of the test result, can solve the problem of difficult installation of the oversized sample, reduces the potential safety hazard in the shearing test process, has simple preparation process, convenient use, low cost and wide application range of the cement-based sample, and provides scientific basis for the design of the oversized test.
Drawings
FIG. 1 is a design drawing of a shear test of a rectangular boss anchoring structure face sample of the present invention; wherein (a) a single sample; (b) a multi-block combination sample; (c) and (5) shearing and loading the module.
FIG. 2 is a design drawing of a shear test of a triangular boss anchoring structural surface sample of the present invention; wherein (a) a single sample; (b) a multi-block combination sample; (c) and (5) shearing and loading the module.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1, a shear test method for an oversized anchor structure surface comprises the following steps:
(1) manufacturing a plurality of anchor rod-containing cement-based samples according to the indoor sample similarity ratio principle, wherein the samples are cubes containing bosses, the specific sizes are shown in figure 1(a), the side bosses are respectively rectangular, the side length of each sample is 4l, l is more than or equal to 0.4m and less than or equal to 0.8m, the rectangular bosses are squares, the side length is 0.5l, and the distance is l;
(2) inserting an anchor rod in the sample preparation process, carrying out full-length bonding type anchoring, and arranging a high-temperature and high-pressure resistant multifunctional fiber grating sensor, wherein the space between the structural surface and the position near the boss is 0.1m, and the spaces between other positions are 0.2 m;
(3) combining the samples into a series-size multi-block sample, wherein the number of blocks in the shearing direction is n, n is more than or equal to 2 and less than or equal to 10, the number of blocks in the width direction is 2, and the number of blocks in the height direction is 2 as shown in fig. 1 (b);
(4) selecting low-alloy high-strength steel according to the national standard (GBT 1591-;
(5) assembling a plurality of body samples and a shear test module, carrying out a shear test on a large-size direct shear apparatus platform, arranging an acoustic emission probe on the surface of the module, and judging the stress condition of a boss by utilizing the monitored information of stress, strain, displacement, acoustic emission and the like;
(6) and (3) repeating the steps (1) to (5) to design the shearing test of the oversized anchoring structure surface containing the triangular boss, wherein the triangular boss is an equilateral triangle, the side length is 0.8l, and the design corresponds to the figures 2(a), 2(b) and 2 (c).
Furthermore, in the step (1), various composite materials such as magnesium ash and the like can be added into the cement base to improve the strength of the cement base.
In the step (2), the diameter of the anchor rod is 10-40 mm, and the anchoring diameter is 2 times of the diameter of the anchor rod.
In the step (3), if the deformation or the fracture of the boss is monitored to be serious, the size of the boss needs to be increased, and meanwhile, the strength is increased.
The scheme of this embodiment can avoid the super large-size sample end to produce stress concentration and lead to local destruction, and can guarantee stock atress in coordination, has improved the matching nature, rationality and the scientificity of test result, can solve super large-size sample installation difficulty simultaneously again, has reduced the potential safety hazard of shear test process, and cement base sample preparation simple process, convenient to use, with low costs, application scope is wide, provides the scientific foundation for the experimental design of super large-size.

Claims (4)

1. A shear test method for an oversized anchoring structure surface is characterized by comprising the following steps:
(1) manufacturing a plurality of anchor rod-containing cement-based samples according to the indoor sample similarity ratio principle, wherein the samples are cubes containing bosses, the bosses on the side edges are respectively rectangular, the side length of each sample is 4l, l is more than or equal to 0.4m and less than or equal to 0.8m, the rectangular bosses are squares, the side length is 0.5l, and the distance is l;
(2) inserting an anchor rod in the sample preparation process to form full-length bonding type anchoring, and arranging a high-temperature and high-pressure resistant multifunctional fiber grating sensor, wherein the space between the structural surface and the position near the boss is 0.1m, and the spaces between other positions are 0.2 m;
(3) combining the samples into a series of size multi-block samples, wherein the number of blocks in the shearing direction is n, n is more than or equal to 2 and less than or equal to 10, the number of blocks in the width direction is 2, and the number of blocks in the height direction is 2;
(4) selecting low-alloy high-strength steel according to the national standard GBT 1591-2018, and preparing a shear test loading module matched with the series oversized samples;
(5) assembling a plurality of body samples and a shear test module, carrying out a shear test on a large-size direct shear apparatus platform, arranging an acoustic emission probe on the surface of the module, and judging the stress condition of a boss by utilizing the monitored stress, strain, displacement and acoustic emission information;
(6) and (5) repeating the steps (1) to (5) to design the shearing test of the oversized anchoring structure surface containing the triangular boss, wherein the triangular boss is an equilateral triangle, and the side length is 0.8 l.
2. The method for shear testing of oversized anchor structure surface as claimed in claim 1, wherein in step (1), a plurality of composite materials can be added to the cement base to improve the strength.
3. The method for shear testing of oversized anchor structure surface as claimed in claim 1 or 2, wherein in step (2), the diameter of the anchor rod is 10-40 mm, and the anchoring diameter is 2 times of the diameter of the anchor rod.
4. The method for shear testing of oversized anchor structure surface as claimed in claim 1 or 2, wherein in step (3), if deformation or severe rupture of the boss is detected, the size of the boss needs to be increased, and the strength needs to be increased.
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