Method for carrying out anchoring research on anchor rods with high-content expansive agents by aid of CT (computer tomography) scanning technologies
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A technology of CT scanning and expansion agent, which is applied in the field of civil engineering test equipment, can solve the problems of long construction period and high construction cost
Active Publication Date: 2017-12-12
CHINA THREE GORGES UNIV
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Problems solved by technology
[0006] Second, solve the problem of long construction period and high construction cost of traditional anchor bolts
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Embodiment 1
[0042] A device and method for using CT scanning technology to conduct research on bolt anchoring with a large amount of expansion agent. The method includes the following steps:
[0043] Step1: Select the concrete test block as the material used in the test;
[0044] Step2: Use concrete pouring to make 3 identical cubic rock samples, the size of which is: 300mm×300mm×300mm; during the pouring process of the test block, reserve a cylindrical hole in the center of each rock sample , the diameter of the cylinder hole is 40mm, and the depth is 300mm; after 28 days, a CT scan is performed on the rock-like sample to obtain the CT value inside the rock-like sample (the CT value is the compactness value).
[0045] Step3: Arrange multiple pressure sensor groups equidistantly at depths of 50mm, 150mm, and 250mm from the top orifice. Each pressure sensor group is composed of three pressure sensors arranged on the same depth section, in the same plane, on the section The angle between t...
Embodiment 2
[0052] The method for carrying out large-volume expansion agent bolt anchorage research with CT scanning technology comprises the following steps:
[0053] Step1: Select hard sandstone as the material used in the test;
[0054] Step2: Cut the rock material, make three identical 300mm×300mm×300mm cube rock samples, take a cylinder hole in the center of each rock sample, the diameter of the cylinder hole is 40mm, and the depth is 300mm; the cylinder The number of holes is 3; after the drilling is completed, CT scanning is performed on the rock sample block to be made, and the CT value is recorded (CT value is the rock compactness value).
[0055] Step3: Arrange multiple pressure sensor groups equidistantly at depths of 50mm, 150mm, and 250mm from the top orifice. Each pressure sensor group is composed of three pressure sensors arranged on the same depth section, in the same plane, on the section The angle between the three pressure sensors is 120°; 10 pressure sensors are arran...
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Abstract
The invention relates to a method for carrying out anchoring research on anchor rods with high-content expansive agents by the aid of CT (computer tomography) scanning technologies. The method includes steps of manufacturing surrounding rock mass from selected rock materials or rock-like materials and cutting materials and drilling the surrounding rock mass; arranging pressure sensors; arranging strain gauges; preparing expansive cement slurry; acquiring pressure data at different time points after the expansive cement slurry is poured; drawing time-varying images of compressive stress of the expansive cement slurry with different expansive agent contents; carrying out step-by-step pull-out tests and the like. The method has the advantages that the problem of high influence on internal CT values of existing anchoring systems due to the existence of metal during CT scanning can be solved; true research can be carried out on time-varying laws of the compressive stress of the expansive cement slurry of anchoring systems with the different expansive agent contents under the effects of ground stress and underground water, three-main-body and two-interface failure modes and evolution laws under the effects of the ground stress and the underground water and distribution laws of axial force and shear stress of the anchor rods, and laws of change of the pulling resistance along with the contents of the expansive agents can be ultimately obtained.
Description
technical field [0001] The invention relates to a research method of using expansive cement to expand the head of a perforated steel pipe for large-scale use in CT scanning technology to carry out large-volume expansion agent bolt anchoring, and belongs to the field of civil engineering test devices. Background technique [0002] CT scanning technology is a non-destructive detection technology, which has been widely researched and applied because of its convenience, high safety, and intuitive results. CT scanning can dynamically and quantitatively measure the changes in the internal structure of materials during the process of stress, and the resulting image can directly reflect the defects and damage inside the object, and can perform quantitative analysis on defects and damage. The working principle of CT scanning technology is to use X-rays to scan a section of the object to be inspected from multiple directions under the non-destructive state of the object to be inspecte...
Claims
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