Rock-soil mass high volume expansion cement slurry expansion process visualization device and use method

Abstract

The invention discloses a rock-soil mass high volume expansion cement slurry expansion process visualization device. The device includes a cuboid box for holding soil or rock sample, and the cuboid box has an opening top and a sealed bottom. One side of the cuboid box is open and is equipped with tempered glass, the outer surface of the tempered glass is provided with calibrated scale, the inner side of the tempered glass is provided with a pipe for adding expansion cement slurry, the pipe is internally provided with an anchor rod, the anchor rod is equipped with a pressure sensor and a strain gauge, and the output ends of the pressure sensor and the strain gauge are connected to a data acquisition system. The top of the cuboid box is connected to a mounting plate through a support frame, the bottom of the mounting plate is connected to a jack fixed end, the support frame is internally provided with a bearing plate matching the cuboid box top opening, and the jack telescopic end clings to the upper surface of the bearing plate. The invention also discloses a corresponding use method, thus finally realizing the whole process visualization of time-varying cement slurries with different expanding agent contents and the anchor rod pull-out test destruction mode under different soil compactness or ground stress conditions.

Description

technical field [0001] The invention relates to the field of civil engineering experiments, in particular to a visualization device for the expansion process of large-volume expansion cement slurry of rock and soil mass and a method for using it. Background technique [0002] Expansive agents are widely used in today's building construction. Its main function is to compensate for the shrinkage and shrinkage of concrete during the hardening process. In order to improve some related properties of concrete in engineering, the expansion agent can be applied to underground, Reinforced concrete structure projects such as hydraulic engineering, marine engineering, subways, tunnels, etc., improve the compactness, impermeability, wear resistance, and gripping force of steel bars during use. At present, expansive cement slurry is gradually being applied in support engineering. Expansive cement slurry can be used for bolts and anchors, and its lateral expansion performance can be used ...

AI Technical Summary

Problems solved by technology

At present, expansive cement slurry is gradually being applied in support engineering. Expansive cement slurry can be used for bolts and anchors, and its lateral expansion performance can be used to improve the pullout resistance of bolts. This application is used in rock and soil anchoring technology It has significant economic benefits, but in the use of expansion agent, there are strict requirements on quality, too high or too low is not conducive to the use of the project, and may even exceed the expected effect, so it is necessary to design the expansion agent in combination with the actual engineering situation The content of the expansion agent, and the impact process of the expansion cement slurry on the surrounding rock under different expansion agent contents and different external forces is unpredictable in engineering design, and it is also a problem that construction personnel are more concerned about. Therefore, the cement slurry with different expansion agent contents The visualization of the expansion process under different conditions has extremely high engineering research value for the wide application of expansive cement slurry. However, in actual engineering, there is no specific visualization device and observation method for the expansion process of large-volume expansive cement slurry, which is not conducive to people. Study the failure mode and evolution law of the two interfaces (interfaces between the three main bodies) of the three main bodies (anchor, anchor body, soil mass or rock mass) under different soil compactness or ground stress conditions

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