I type stress intensity factor test method considering frost heaving force periodic change

A technology of stress intensity factor and periodic variation, applied in the field of civil engineering, can solve the problem of inaccurate results and achieve the effect of accurate characterization

Active Publication Date: 2020-09-29
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

However, the current results of freeze-thaw damage charac

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  • I type stress intensity factor test method considering frost heaving force periodic change
  • I type stress intensity factor test method considering frost heaving force periodic change
  • I type stress intensity factor test method considering frost heaving force periodic change

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following technical solutions in the present invention are clearly and completely described. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] Such as Figure 1-3 As shown in Fig. 1, a specimen with a size of 200mm×100mm×100mm (length×width×height) is made, and the cracks are opened due to the action of frost heaving force, and the cracks can be approximated by cutting with a water knife, see figure 1 shown. The specimen is evacuated and saturated, and the plastic zone radius r is determined by numerical simulation p (Zone I); the pasting distances within the range of Zone II on the y-axis are ...

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Abstract

The invention provides an I type stress intensity factor test method considering frost heaving force periodic change. The method comprises the following steps: step 1, manufacturing a test piece, andapproximately simulating a crack of a non-through rock mass by using a water knife kerf on the test piece; step 2, vacuumizing and saturating the test piece; step 3, sticking a strain gauge in a non-plastic region range of the tip of the test piece; step 4, putting the test piece into a rock fracture frost heaving test box, pressurizing air bags on the two sides of the frost heaving test box by using a pressurizing device, closing a valve, taking down a pipeline, putting the frost heaving test box filled with the test piece into a water tank, and enabling water to submerge the test piece; andstep 5, putting the water tank and the frost heaving test box into which the test piece is put into a high-low temperature alternating test box together to start a freeze-thaw cycle test. According tothe method, the freezing and thawing state of the non-through fractured rock mass can be truly simulated in the mode that water is effectively blocked when the cracks of the sample are frozen and water is supplemented in time when the cracks of the sample are thawed, so that the freezing and thawing damage result of the fractured rock mass can be accurately represented.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a test method for testing type I stress intensity factor considering the periodic variation of frost heaving force. Background technique [0002] The surrounding rock of the tunnel will be deformed and cracked after excavation disturbance, and the rock matrix and cracks will be damaged under the conditions of rich water and freeze-thaw cycles. It is a basic problem for tunnels in cold regions to study the damage characteristics and evolution law. Many scholars have tested the physical and mechanical properties of rocks after freeze-thaw cycles, and achieved fruitful results, proving that the freeze-thaw action promotes rock weathering and leads to a decrease in physical and mechanical properties. Studies have shown that freeze-thaw cycles can cause damage to rocks, and their physical and mechanical properties will also attenuate accordingly. This change feature has formed a conse...

Claims

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Application Information

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IPC IPC(8): G01N25/14G01N3/00G01N1/36
CPCG01N25/145G01N25/14G01N3/00G01N1/36G01N2203/0228G01N2203/0246G01N2203/0298G01N33/24G01N2001/2873G01N3/60G01N1/286G01N17/002G01M99/002
Inventor 冯强杨泽东张爽靳吉超刘炜炜秦哲李廷春
Owner SHANDONG UNIV OF SCI & TECH
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